JDK14/Java14源码在线阅读
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package javax.swing;
import java.awt.*;
import java.awt.event.*;
import java.beans.JavaBean;
import java.beans.BeanProperty;
import java.beans.ConstructorProperties;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.io.*;
import java.util.*;
import javax.swing.event.*;
import javax.swing.plaf.*;
import javax.swing.tree.*;
import javax.swing.text.Position;
import javax.accessibility.*;
import sun.awt.AWTAccessor;
import sun.awt.AWTAccessor.MouseEventAccessor;
import sun.swing.SwingUtilities2;
import sun.swing.SwingUtilities2.Section;
import static sun.swing.SwingUtilities2.Section.*;
/**
* A control that displays a set of hierarchical data as an outline.
* You can find task-oriented documentation and examples of using trees in
* <a href="https://docs.oracle.com/javase/tutorial/uiswing/components/tree.html">How to Use Trees</a>,
* a section in <em>The Java Tutorial.</em>
* <p>
* A specific node in a tree can be identified either by a
* <code>TreePath</code> (an object
* that encapsulates a node and all of its ancestors), or by its
* display row, where each row in the display area displays one node.
* An <i>expanded</i> node is a non-leaf node (as identified by
* <code>TreeModel.isLeaf(node)</code> returning false) that will displays
* its children when all its ancestors are <i>expanded</i>.
* A <i>collapsed</i>
* node is one which hides them. A <i>hidden</i> node is one which is
* under a collapsed ancestor. All of a <i>viewable</i> nodes parents
* are expanded, but may or may not be displayed. A <i>displayed</i> node
* is both viewable and in the display area, where it can be seen.
* </p>
* The following <code>JTree</code> methods use "visible" to mean "displayed":
* <ul>
* <li><code>isRootVisible()</code>
* <li><code>setRootVisible()</code>
* <li><code>scrollPathToVisible()</code>
* <li><code>scrollRowToVisible()</code>
* <li><code>getVisibleRowCount()</code>
* <li><code>setVisibleRowCount()</code>
* </ul>
* The next group of <code>JTree</code> methods use "visible" to mean
* "viewable" (under an expanded parent):
* <ul>
* <li><code>isVisible()</code>
* <li><code>makeVisible()</code>
* </ul>
* If you are interested in knowing when the selection changes implement
* the <code>TreeSelectionListener</code> interface and add the instance
* using the method <code>addTreeSelectionListener</code>.
* <code>valueChanged</code> will be invoked when the
* selection changes, that is if the user clicks twice on the same
* node <code>valueChanged</code> will only be invoked once.
* <p>
* If you are interested in detecting either double-click events or when
* a user clicks on a node, regardless of whether or not it was selected,
* we recommend you do the following:
* </p>
* <pre>
* final JTree tree = ...;
*
* MouseListener ml = new MouseAdapter() {
* public void <b>mousePressed</b>(MouseEvent e) {
* int selRow = tree.getRowForLocation(e.getX(), e.getY());
* TreePath selPath = tree.getPathForLocation(e.getX(), e.getY());
* if(selRow != -1) {
* if(e.getClickCount() == 1) {
* mySingleClick(selRow, selPath);
* }
* else if(e.getClickCount() == 2) {
* myDoubleClick(selRow, selPath);
* }
* }
* }
* };
* tree.addMouseListener(ml);
* </pre>
* NOTE: This example obtains both the path and row, but you only need to
* get the one you're interested in.
* <p>
* To use <code>JTree</code> to display compound nodes
* (for example, nodes containing both
* a graphic icon and text), subclass {@link TreeCellRenderer} and use
* {@link #setCellRenderer} to tell the tree to use it. To edit such nodes,
* subclass {@link TreeCellEditor} and use {@link #setCellEditor}.
* </p>
* <p>
* Like all <code>JComponent</code> classes, you can use {@link InputMap} and
* {@link ActionMap}
* to associate an {@link Action} object with a {@link KeyStroke}
* and execute the action under specified conditions.
* </p>
* <strong>Warning:</strong> Swing is not thread safe. For more
* information see <a
* href="package-summary.html#threading">Swing's Threading
* Policy</a>.
* <p>
* <strong>Warning:</strong>
* Serialized objects of this class will not be compatible with
* future Swing releases. The current serialization support is
* appropriate for short term storage or RMI between applications running
* the same version of Swing. As of 1.4, support for long term storage
* of all JavaBeans™
* has been added to the <code>java.beans</code> package.
* Please see {@link java.beans.XMLEncoder}.
*</p>
*
* @author Rob Davis
* @author Ray Ryan
* @author Scott Violet
* @since 1.2
*/
@JavaBean(defaultProperty = "UI", description = "A component that displays a set of hierarchical data as an outline.")
@SwingContainer(false)
@SuppressWarnings("serial")
public class JTree extends JComponent implements Scrollable, Accessible
{
/**
* @see #getUIClassID
* @see #readObject
*/
private static final String uiClassID = "TreeUI";
/**
* The model that defines the tree displayed by this object.
*/
protected transient TreeModel treeModel;
/**
* Models the set of selected nodes in this tree.
*/
protected transient TreeSelectionModel selectionModel;
/**
* True if the root node is displayed, false if its children are
* the highest visible nodes.
*/
protected boolean rootVisible;
/**
* The cell used to draw nodes. If <code>null</code>, the UI uses a default
* <code>cellRenderer</code>.
*/
protected transient TreeCellRenderer cellRenderer;
/**
* Height to use for each display row. If this is <= 0 the renderer
* determines the height for each row.
*/
protected int rowHeight;
private boolean rowHeightSet = false;
/**
* Maps from <code>TreePath</code> to <code>Boolean</code>
* indicating whether or not the
* particular path is expanded. This ONLY indicates whether a
* given path is expanded, and NOT if it is visible or not. That
* information must be determined by visiting all the parent
* paths and seeing if they are visible.
*/
private transient Hashtable<TreePath, Boolean> expandedState;
/**
* True if handles are displayed at the topmost level of the tree.
* <p>
* A handle is a small icon that displays adjacent to the node which
* allows the user to click once to expand or collapse the node. A
* common interface shows a plus sign (+) for a node which can be
* expanded and a minus sign (-) for a node which can be collapsed.
* Handles are always shown for nodes below the topmost level.
* <p>
* If the <code>rootVisible</code> setting specifies that the root
* node is to be displayed, then that is the only node at the topmost
* level. If the root node is not displayed, then all of its
* children are at the topmost level of the tree. Handles are
* always displayed for nodes other than the topmost.
* <p>
* If the root node isn't visible, it is generally a good to make
* this value true. Otherwise, the tree looks exactly like a list,
* and users may not know that the "list entries" are actually
* tree nodes.
*
* @see #rootVisible
*/
protected boolean showsRootHandles;
private boolean showsRootHandlesSet = false;
/**
* Creates a new event and passed it off the
* <code>selectionListeners</code>.
*/
protected transient TreeSelectionRedirector selectionRedirector;
/**
* Editor for the entries. Default is <code>null</code>
* (tree is not editable).
*/
protected transient TreeCellEditor cellEditor;
/**
* Is the tree editable? Default is false.
*/
protected boolean editable;
/**
* Is this tree a large model? This is a code-optimization setting.
* A large model can be used when the cell height is the same for all
* nodes. The UI will then cache very little information and instead
* continually message the model. Without a large model the UI caches
* most of the information, resulting in fewer method calls to the model.
* <p>
* This value is only a suggestion to the UI. Not all UIs will
* take advantage of it. Default value is false.
*/
protected boolean largeModel;
/**
* Number of rows to make visible at one time. This value is used for
* the <code>Scrollable</code> interface. It determines the preferred
* size of the display area.
*/
protected int visibleRowCount;
/**
* If true, when editing is to be stopped by way of selection changing,
* data in tree changing or other means <code>stopCellEditing</code>
* is invoked, and changes are saved. If false,
* <code>cancelCellEditing</code> is invoked, and changes
* are discarded. Default is false.
*/
protected boolean invokesStopCellEditing;
/**
* If true, when a node is expanded, as many of the descendants are
* scrolled to be visible.
*/
protected boolean scrollsOnExpand;
private boolean scrollsOnExpandSet = false;
/**
* Number of mouse clicks before a node is expanded.
*/
protected int toggleClickCount;
/**
* Updates the <code>expandedState</code>.
*/
protected transient TreeModelListener treeModelListener;
/**
* Used when <code>setExpandedState</code> is invoked,
* will be a <code>Stack</code> of <code>Stack</code>s.
*/
private transient Stack<Stack<TreePath>> expandedStack;
/**
* Lead selection path, may not be <code>null</code>.
*/
private TreePath leadPath;
/**
* Anchor path.
*/
private TreePath anchorPath;
/**
* True if paths in the selection should be expanded.
*/
private boolean expandsSelectedPaths;
/**
* This is set to true for the life of the <code>setUI</code> call.
*/
private boolean settingUI;
/** If true, mouse presses on selections initiate a drag operation. */
private boolean dragEnabled;
/**
* The drop mode for this component.
*/
private DropMode dropMode = DropMode.USE_SELECTION;
/**
* The drop location.
*/
private transient DropLocation dropLocation;
/**
* Flag to indicate UI update is in progress
*/
private transient boolean updateInProgress;
/**
* A subclass of <code>TransferHandler.DropLocation</code> representing
* a drop location for a <code>JTree</code>.
*
* @see #getDropLocation
* @since 1.6
*/
public static final class DropLocation extends TransferHandler.DropLocation {
private final TreePath path;
private final int index;
private DropLocation(Point p, TreePath path, int index) {
super(p);
this.path = path;
this.index = index;
}
/**
* Returns the index where the dropped data should be inserted
* with respect to the path returned by <code>getPath()</code>.
* <p>
* For drop modes <code>DropMode.USE_SELECTION</code> and
* <code>DropMode.ON</code>, this index is unimportant (and it will
* always be <code>-1</code>) as the only interesting data is the
* path over which the drop operation occurred.
* <p>
* For drop mode <code>DropMode.INSERT</code>, this index
* indicates the index at which the data should be inserted into
* the parent path represented by <code>getPath()</code>.
* <code>-1</code> indicates that the drop occurred over the
* parent itself, and in most cases should be treated as inserting
* into either the beginning or the end of the parent's list of
* children.
* <p>
* For <code>DropMode.ON_OR_INSERT</code>, this value will be
* an insert index, as described above, or <code>-1</code> if
* the drop occurred over the path itself.
*
* @return the child index
* @see #getPath
*/
public int getChildIndex() {
return index;
}
/**
* Returns the path where dropped data should be placed in the
* tree.
* <p>
* Interpretation of this value depends on the drop mode set on the
* component. If the drop mode is <code>DropMode.USE_SELECTION</code>
* or <code>DropMode.ON</code>, the return value is the path in the
* tree over which the data has been (or will be) dropped.
* <code>null</code> indicates that the drop is over empty space,
* not associated with a particular path.
* <p>
* If the drop mode is <code>DropMode.INSERT</code>, the return value
* refers to the path that should become the parent of the new data,
* in which case <code>getChildIndex()</code> indicates where the
* new item should be inserted into this parent path. A
* <code>null</code> path indicates that no parent path has been
* determined, which can happen for multiple reasons:
* <ul>
* <li>The tree has no model
* <li>There is no root in the tree
* <li>The root is collapsed
* <li>The root is a leaf node
* </ul>
* It is up to the developer to decide if and how they wish to handle
* the <code>null</code> case.
* <p>
* If the drop mode is <code>DropMode.ON_OR_INSERT</code>,
* <code>getChildIndex</code> can be used to determine whether the
* drop is on top of the path itself (<code>-1</code>) or the index
* at which it should be inserted into the path (values other than
* <code>-1</code>).
*
* @return the drop path
* @see #getChildIndex
*/
public TreePath getPath() {
return path;
}
/**
* Returns a string representation of this drop location.
* This method is intended to be used for debugging purposes,
* and the content and format of the returned string may vary
* between implementations.
*
* @return a string representation of this drop location
*/
public String toString() {
return getClass().getName()
+ "[dropPoint=" + getDropPoint() + ","
+ "path=" + path + ","
+ "childIndex=" + index + "]";
}
}
/**
* The row to expand during DnD.
*/
private int expandRow = -1;
@SuppressWarnings("serial")
private class TreeTimer extends Timer {
public TreeTimer() {
super(2000, null);
setRepeats(false);
}
public void fireActionPerformed(ActionEvent ae) {
JTree.this.expandRow(expandRow);
}
}
/**
* A timer to expand nodes during drop.
*/
private TreeTimer dropTimer;
/**
* When <code>addTreeExpansionListener</code> is invoked,
* and <code>settingUI</code> is true, this ivar gets set to the passed in
* <code>Listener</code>. This listener is then notified first in
* <code>fireTreeCollapsed</code> and <code>fireTreeExpanded</code>.
* <p>This is an ugly workaround for a way to have the UI listener
* get notified before other listeners.
*/
private transient TreeExpansionListener uiTreeExpansionListener;
/**
* Max number of stacks to keep around.
*/
private static int TEMP_STACK_SIZE = 11;
//
// Bound property names
//
/** Bound property name for <code>cellRenderer</code>. */
public static final String CELL_RENDERER_PROPERTY = "cellRenderer";
/** Bound property name for <code>treeModel</code>. */
public static final String TREE_MODEL_PROPERTY = "model";
/** Bound property name for <code>rootVisible</code>. */
public static final String ROOT_VISIBLE_PROPERTY = "rootVisible";
/** Bound property name for <code>showsRootHandles</code>. */
public static final String SHOWS_ROOT_HANDLES_PROPERTY = "showsRootHandles";
/** Bound property name for <code>rowHeight</code>. */
public static final String ROW_HEIGHT_PROPERTY = "rowHeight";
/** Bound property name for <code>cellEditor</code>. */
public static final String CELL_EDITOR_PROPERTY = "cellEditor";
/** Bound property name for <code>editable</code>. */
public static final String EDITABLE_PROPERTY = "editable";
/** Bound property name for <code>largeModel</code>. */
public static final String LARGE_MODEL_PROPERTY = "largeModel";
/** Bound property name for selectionModel. */
public static final String SELECTION_MODEL_PROPERTY = "selectionModel";
/** Bound property name for <code>visibleRowCount</code>. */
public static final String VISIBLE_ROW_COUNT_PROPERTY = "visibleRowCount";
/** Bound property name for <code>messagesStopCellEditing</code>. */
public static final String INVOKES_STOP_CELL_EDITING_PROPERTY = "invokesStopCellEditing";
/** Bound property name for <code>scrollsOnExpand</code>. */
public static final String SCROLLS_ON_EXPAND_PROPERTY = "scrollsOnExpand";
/** Bound property name for <code>toggleClickCount</code>. */
public static final String TOGGLE_CLICK_COUNT_PROPERTY = "toggleClickCount";
/** Bound property name for <code>leadSelectionPath</code>.
* @since 1.3 */
public static final String LEAD_SELECTION_PATH_PROPERTY = "leadSelectionPath";
/** Bound property name for anchor selection path.
* @since 1.3 */
public static final String ANCHOR_SELECTION_PATH_PROPERTY = "anchorSelectionPath";
/** Bound property name for expands selected paths property
* @since 1.3 */
public static final String EXPANDS_SELECTED_PATHS_PROPERTY = "expandsSelectedPaths";
/**
* Creates and returns a sample <code>TreeModel</code>.
* Used primarily for beanbuilders to show something interesting.
*
* @return the default <code>TreeModel</code>
*/
protected static TreeModel getDefaultTreeModel() {
DefaultMutableTreeNode root = new DefaultMutableTreeNode("JTree");
DefaultMutableTreeNode parent;
parent = new DefaultMutableTreeNode("colors");
root.add(parent);
parent.add(new DefaultMutableTreeNode("blue"));
parent.add(new DefaultMutableTreeNode("violet"));
parent.add(new DefaultMutableTreeNode("red"));
parent.add(new DefaultMutableTreeNode("yellow"));
parent = new DefaultMutableTreeNode("sports");
root.add(parent);
parent.add(new DefaultMutableTreeNode("basketball"));
parent.add(new DefaultMutableTreeNode("soccer"));
parent.add(new DefaultMutableTreeNode("football"));
parent.add(new DefaultMutableTreeNode("hockey"));
parent = new DefaultMutableTreeNode("food");
root.add(parent);
parent.add(new DefaultMutableTreeNode("hot dogs"));
parent.add(new DefaultMutableTreeNode("pizza"));
parent.add(new DefaultMutableTreeNode("ravioli"));
parent.add(new DefaultMutableTreeNode("bananas"));
return new DefaultTreeModel(root);
}
/**
* Returns a <code>TreeModel</code> wrapping the specified object.
* If the object is:<ul>
* <li>an array of <code>Object</code>s,
* <li>a <code>Hashtable</code>, or
* <li>a <code>Vector</code>
* </ul>then a new root node is created with each of the incoming
* objects as children. Otherwise, a new root is created with
* a value of {@code "root"}.
*
* @param value the <code>Object</code> used as the foundation for
* the <code>TreeModel</code>
* @return a <code>TreeModel</code> wrapping the specified object
*/
protected static TreeModel createTreeModel(Object value) {
DefaultMutableTreeNode root;
if((value instanceof Object[]) || (value instanceof Hashtable) ||
(value instanceof Vector)) {
root = new DefaultMutableTreeNode("root");
DynamicUtilTreeNode.createChildren(root, value);
}
else {
root = new DynamicUtilTreeNode("root", value);
}
return new DefaultTreeModel(root, false);
}
/**
* Returns a <code>JTree</code> with a sample model.
* The default model used by the tree defines a leaf node as any node
* without children.
*
* @see DefaultTreeModel#asksAllowsChildren
*/
public JTree() {
this(getDefaultTreeModel());
}
/**
* Returns a <code>JTree</code> with each element of the
* specified array as the
* child of a new root node which is not displayed.
* By default, the tree defines a leaf node as any node without
* children.
*
* @param value an array of <code>Object</code>s
* @see DefaultTreeModel#asksAllowsChildren
*/
public JTree(Object[] value) {
this(createTreeModel(value));
this.setRootVisible(false);
this.setShowsRootHandles(true);
expandRoot();
}
/**
* Returns a <code>JTree</code> with each element of the specified
* <code>Vector</code> as the
* child of a new root node which is not displayed. By default, the
* tree defines a leaf node as any node without children.
*
* @param value a <code>Vector</code>
* @see DefaultTreeModel#asksAllowsChildren
*/
public JTree(Vector<?> value) {
this(createTreeModel(value));
this.setRootVisible(false);
this.setShowsRootHandles(true);
expandRoot();
}
/**
* Returns a <code>JTree</code> created from a <code>Hashtable</code>
* which does not display with root.
* Each value-half of the key/value pairs in the <code>HashTable</code>
* becomes a child of the new root node. By default, the tree defines
* a leaf node as any node without children.
*
* @param value a <code>Hashtable</code>
* @see DefaultTreeModel#asksAllowsChildren
*/
public JTree(Hashtable<?,?> value) {
this(createTreeModel(value));
this.setRootVisible(false);
this.setShowsRootHandles(true);
expandRoot();
}
/**
* Returns a <code>JTree</code> with the specified
* <code>TreeNode</code> as its root,
* which displays the root node.
* By default, the tree defines a leaf node as any node without children.
*
* @param root a <code>TreeNode</code> object
* @see DefaultTreeModel#asksAllowsChildren
*/
public JTree(TreeNode root) {
this(root, false);
}
/**
* Returns a <code>JTree</code> with the specified <code>TreeNode</code>
* as its root, which
* displays the root node and which decides whether a node is a
* leaf node in the specified manner.
*
* @param root a <code>TreeNode</code> object
* @param asksAllowsChildren if false, any node without children is a
* leaf node; if true, only nodes that do not allow
* children are leaf nodes
* @see DefaultTreeModel#asksAllowsChildren
*/
public JTree(TreeNode root, boolean asksAllowsChildren) {
this(new DefaultTreeModel(root, asksAllowsChildren));
}
/**
* Returns an instance of <code>JTree</code> which displays the root node
* -- the tree is created using the specified data model.
*
* @param newModel the <code>TreeModel</code> to use as the data model
*/
@ConstructorProperties({"model"})
public JTree(TreeModel newModel) {
super();
expandedStack = new Stack<Stack<TreePath>>();
toggleClickCount = 2;
expandedState = new Hashtable<TreePath, Boolean>();
setLayout(null);
rowHeight = 16;
visibleRowCount = 20;
rootVisible = true;
selectionModel = new DefaultTreeSelectionModel();
cellRenderer = null;
scrollsOnExpand = true;
setOpaque(true);
expandsSelectedPaths = true;
updateUI();
setModel(newModel);
}
/**
* Returns the L&F object that renders this component.
*
* @return the <code>TreeUI</code> object that renders this component
*/
public TreeUI getUI() {
return (TreeUI)ui;
}
/**
* Sets the L&F object that renders this component.
* <p>
* This is a bound property.
*
* @param ui the <code>TreeUI</code> L&F object
* @see UIDefaults#getUI
*/
@BeanProperty(hidden = true, visualUpdate = true, description
= "The UI object that implements the Component's LookAndFeel.")
public void setUI(TreeUI ui) {
if (this.ui != ui) {
settingUI = true;
uiTreeExpansionListener = null;
try {
super.setUI(ui);
}
finally {
settingUI = false;
}
}
}
/**
* Notification from the <code>UIManager</code> that the L&F has changed.
* Replaces the current UI object with the latest version from the
* <code>UIManager</code>.
*
* @see JComponent#updateUI
*/
public void updateUI() {
if (!updateInProgress) {
updateInProgress = true;
try {
setUI((TreeUI)UIManager.getUI(this));
SwingUtilities.updateRendererOrEditorUI(getCellRenderer());
SwingUtilities.updateRendererOrEditorUI(getCellEditor());
} finally {
updateInProgress = false;
}
}
}
/**
* Returns the name of the L&F class that renders this component.
*
* @return the string "TreeUI"
* @see JComponent#getUIClassID
* @see UIDefaults#getUI
*/
@BeanProperty(bound = false)
public String getUIClassID() {
return uiClassID;
}
/**
* Returns the current <code>TreeCellRenderer</code>
* that is rendering each cell.
*
* @return the <code>TreeCellRenderer</code> that is rendering each cell
*/
public TreeCellRenderer getCellRenderer() {
return cellRenderer;
}
/**
* Sets the <code>TreeCellRenderer</code> that will be used to
* draw each cell.
* <p>
* This is a bound property.
*
* @param x the <code>TreeCellRenderer</code> that is to render each cell
*/
@BeanProperty(description
= "The TreeCellRenderer that will be used to draw each cell.")
public void setCellRenderer(TreeCellRenderer x) {
TreeCellRenderer oldValue = cellRenderer;
cellRenderer = x;
firePropertyChange(CELL_RENDERER_PROPERTY, oldValue, cellRenderer);
invalidate();
}
/**
* Determines whether the tree is editable. Fires a property
* change event if the new setting is different from the existing
* setting.
* <p>
* This is a bound property.
*
* @param flag a boolean value, true if the tree is editable
*/
@BeanProperty(description
= "Whether the tree is editable.")
public void setEditable(boolean flag) {
boolean oldValue = this.editable;
this.editable = flag;
firePropertyChange(EDITABLE_PROPERTY, oldValue, flag);
if (accessibleContext != null) {
accessibleContext.firePropertyChange(
AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
(oldValue ? AccessibleState.EDITABLE : null),
(flag ? AccessibleState.EDITABLE : null));
}
}
/**
* Returns true if the tree is editable.
*
* @return true if the tree is editable
*/
public boolean isEditable() {
return editable;
}
/**
* Sets the cell editor. A <code>null</code> value implies that the
* tree cannot be edited. If this represents a change in the
* <code>cellEditor</code>, the <code>propertyChange</code>
* method is invoked on all listeners.
* <p>
* This is a bound property.
*
* @param cellEditor the <code>TreeCellEditor</code> to use
*/
@BeanProperty(description
= "The cell editor. A null value implies the tree cannot be edited.")
public void setCellEditor(TreeCellEditor cellEditor) {
TreeCellEditor oldEditor = this.cellEditor;
this.cellEditor = cellEditor;
firePropertyChange(CELL_EDITOR_PROPERTY, oldEditor, cellEditor);
invalidate();
}
/**
* Returns the editor used to edit entries in the tree.
*
* @return the <code>TreeCellEditor</code> in use,
* or <code>null</code> if the tree cannot be edited
*/
public TreeCellEditor getCellEditor() {
return cellEditor;
}
/**
* Returns the <code>TreeModel</code> that is providing the data.
*
* @return the <code>TreeModel</code> that is providing the data
*/
public TreeModel getModel() {
return treeModel;
}
/**
* Sets the <code>TreeModel</code> that will provide the data.
* <p>
* This is a bound property.
*
* @param newModel the <code>TreeModel</code> that is to provide the data
*/
@BeanProperty(description
= "The TreeModel that will provide the data.")
public void setModel(TreeModel newModel) {
clearSelection();
TreeModel oldModel = treeModel;
if(treeModel != null && treeModelListener != null)
treeModel.removeTreeModelListener(treeModelListener);
if (accessibleContext != null) {
if (treeModel != null) {
treeModel.removeTreeModelListener((TreeModelListener)accessibleContext);
}
if (newModel != null) {
newModel.addTreeModelListener((TreeModelListener)accessibleContext);
}
}
treeModel = newModel;
clearToggledPaths();
if(treeModel != null) {
if(treeModelListener == null)
treeModelListener = createTreeModelListener();
if(treeModelListener != null)
treeModel.addTreeModelListener(treeModelListener);
// Mark the root as expanded, if it isn't a leaf.
Object treeRoot = treeModel.getRoot();
if(treeRoot != null &&
!treeModel.isLeaf(treeRoot)) {
expandedState.put(new TreePath(treeRoot),
Boolean.TRUE);
}
}
firePropertyChange(TREE_MODEL_PROPERTY, oldModel, treeModel);
invalidate();
}
/**
* Returns true if the root node of the tree is displayed.
*
* @return true if the root node of the tree is displayed
* @see #rootVisible
*/
public boolean isRootVisible() {
return rootVisible;
}
/**
* Determines whether or not the root node from
* the <code>TreeModel</code> is visible.
* <p>
* This is a bound property.
*
* @param rootVisible true if the root node of the tree is to be displayed
* @see #rootVisible
*/
@BeanProperty(description
= "Whether or not the root node from the TreeModel is visible.")
public void setRootVisible(boolean rootVisible) {
boolean oldValue = this.rootVisible;
this.rootVisible = rootVisible;
firePropertyChange(ROOT_VISIBLE_PROPERTY, oldValue, this.rootVisible);
if (accessibleContext != null) {
((AccessibleJTree)accessibleContext).fireVisibleDataPropertyChange();
}
}
/**
* Sets the value of the <code>showsRootHandles</code> property,
* which specifies whether the node handles should be displayed.
* The default value of this property depends on the constructor
* used to create the <code>JTree</code>.
* Some look and feels might not support handles;
* they will ignore this property.
* <p>
* This is a bound property.
*
* @param newValue <code>true</code> if root handles should be displayed;
* otherwise, <code>false</code>
* @see #showsRootHandles
* @see #getShowsRootHandles
*/
@BeanProperty(description
= "Whether the node handles are to be displayed.")
public void setShowsRootHandles(boolean newValue) {
boolean oldValue = showsRootHandles;
TreeModel model = getModel();
showsRootHandles = newValue;
showsRootHandlesSet = true;
firePropertyChange(SHOWS_ROOT_HANDLES_PROPERTY, oldValue,
showsRootHandles);
if (accessibleContext != null) {
((AccessibleJTree)accessibleContext).fireVisibleDataPropertyChange();
}
invalidate();
}
/**
* Returns the value of the <code>showsRootHandles</code> property.
*
* @return the value of the <code>showsRootHandles</code> property
* @see #showsRootHandles
*/
public boolean getShowsRootHandles()
{
return showsRootHandles;
}
/**
* Sets the height of each cell, in pixels. If the specified value
* is less than or equal to zero the current cell renderer is
* queried for each row's height.
* <p>
* This is a bound property.
*
* @param rowHeight the height of each cell, in pixels
*/
@BeanProperty(description
= "The height of each cell.")
public void setRowHeight(int rowHeight)
{
int oldValue = this.rowHeight;
this.rowHeight = rowHeight;
rowHeightSet = true;
firePropertyChange(ROW_HEIGHT_PROPERTY, oldValue, this.rowHeight);
invalidate();
}
/**
* Returns the height of each row. If the returned value is less than
* or equal to 0 the height for each row is determined by the
* renderer.
*
* @return the height of each row
*/
public int getRowHeight()
{
return rowHeight;
}
/**
* Returns true if the height of each display row is a fixed size.
*
* @return true if the height of each row is a fixed size
*/
@BeanProperty(bound = false)
public boolean isFixedRowHeight()
{
return (rowHeight > 0);
}
/**
* Specifies whether the UI should use a large model.
* (Not all UIs will implement this.) Fires a property change
* for the LARGE_MODEL_PROPERTY.
* <p>
* This is a bound property.
*
* @param newValue true to suggest a large model to the UI
* @see #largeModel
*/
@BeanProperty(description
= "Whether the UI should use a large model.")
public void setLargeModel(boolean newValue) {
boolean oldValue = largeModel;
largeModel = newValue;
firePropertyChange(LARGE_MODEL_PROPERTY, oldValue, newValue);
}
/**
* Returns true if the tree is configured for a large model.
*
* @return true if a large model is suggested
* @see #largeModel
*/
public boolean isLargeModel() {
return largeModel;
}
/**
* Determines what happens when editing is interrupted by selecting
* another node in the tree, a change in the tree's data, or by some
* other means. Setting this property to <code>true</code> causes the
* changes to be automatically saved when editing is interrupted.
* <p>
* Fires a property change for the INVOKES_STOP_CELL_EDITING_PROPERTY.
*
* @param newValue true means that <code>stopCellEditing</code> is invoked
* when editing is interrupted, and data is saved; false means that
* <code>cancelCellEditing</code> is invoked, and changes are lost
*/
@BeanProperty(description
= "Determines what happens when editing is interrupted, selecting another node in the tree, "
+ "a change in the tree's data, or some other means.")
public void setInvokesStopCellEditing(boolean newValue) {
boolean oldValue = invokesStopCellEditing;
invokesStopCellEditing = newValue;
firePropertyChange(INVOKES_STOP_CELL_EDITING_PROPERTY, oldValue,
newValue);
}
/**
* Returns the indicator that tells what happens when editing is
* interrupted.
*
* @return the indicator that tells what happens when editing is
* interrupted
* @see #setInvokesStopCellEditing
*/
public boolean getInvokesStopCellEditing() {
return invokesStopCellEditing;
}
/**
* Sets the <code>scrollsOnExpand</code> property,
* which determines whether the
* tree might scroll to show previously hidden children.
* If this property is <code>true</code> (the default),
* when a node expands
* the tree can use scrolling to make
* the maximum possible number of the node's descendants visible.
* In some look and feels, trees might not need to scroll when expanded;
* those look and feels will ignore this property.
* <p>
* This is a bound property.
*
* @param newValue <code>false</code> to disable scrolling on expansion;
* <code>true</code> to enable it
* @see #getScrollsOnExpand
*/
@BeanProperty(description
= "Indicates if a node descendant should be scrolled when expanded.")
public void setScrollsOnExpand(boolean newValue) {
boolean oldValue = scrollsOnExpand;
scrollsOnExpand = newValue;
scrollsOnExpandSet = true;
firePropertyChange(SCROLLS_ON_EXPAND_PROPERTY, oldValue,
newValue);
}
/**
* Returns the value of the <code>scrollsOnExpand</code> property.
*
* @return the value of the <code>scrollsOnExpand</code> property
*/
public boolean getScrollsOnExpand() {
return scrollsOnExpand;
}
/**
* Sets the number of mouse clicks before a node will expand or close.
* The default is two.
* <p>
* This is a bound property.
*
* @param clickCount the number of mouse clicks to get a node expanded or closed
* @since 1.3
*/
@BeanProperty(description
= "Number of clicks before a node will expand/collapse.")
public void setToggleClickCount(int clickCount) {
int oldCount = toggleClickCount;
toggleClickCount = clickCount;
firePropertyChange(TOGGLE_CLICK_COUNT_PROPERTY, oldCount,
clickCount);
}
/**
* Returns the number of mouse clicks needed to expand or close a node.
*
* @return number of mouse clicks before node is expanded
* @since 1.3
*/
public int getToggleClickCount() {
return toggleClickCount;
}
/**
* Configures the <code>expandsSelectedPaths</code> property. If
* true, any time the selection is changed, either via the
* <code>TreeSelectionModel</code>, or the cover methods provided by
* <code>JTree</code>, the <code>TreePath</code>s parents will be
* expanded to make them visible (visible meaning the parent path is
* expanded, not necessarily in the visible rectangle of the
* <code>JTree</code>). If false, when the selection
* changes the nodes parent is not made visible (all its parents expanded).
* This is useful if you wish to have your selection model maintain paths
* that are not always visible (all parents expanded).
* <p>
* This is a bound property.
*
* @param newValue the new value for <code>expandsSelectedPaths</code>
*
* @since 1.3
*/
@BeanProperty(description
= "Indicates whether changes to the selection should make the parent of the path visible.")
public void setExpandsSelectedPaths(boolean newValue) {
boolean oldValue = expandsSelectedPaths;
expandsSelectedPaths = newValue;
firePropertyChange(EXPANDS_SELECTED_PATHS_PROPERTY, oldValue,
newValue);
}
/**
* Returns the <code>expandsSelectedPaths</code> property.
* @return true if selection changes result in the parent path being
* expanded
* @since 1.3
* @see #setExpandsSelectedPaths
*/
public boolean getExpandsSelectedPaths() {
return expandsSelectedPaths;
}
/**
* Turns on or off automatic drag handling. In order to enable automatic
* drag handling, this property should be set to {@code true}, and the
* tree's {@code TransferHandler} needs to be {@code non-null}.
* The default value of the {@code dragEnabled} property is {@code false}.
* <p>
* The job of honoring this property, and recognizing a user drag gesture,
* lies with the look and feel implementation, and in particular, the tree's
* {@code TreeUI}. When automatic drag handling is enabled, most look and
* feels (including those that subclass {@code BasicLookAndFeel}) begin a
* drag and drop operation whenever the user presses the mouse button over
* an item and then moves the mouse a few pixels. Setting this property to
* {@code true} can therefore have a subtle effect on how selections behave.
* <p>
* If a look and feel is used that ignores this property, you can still
* begin a drag and drop operation by calling {@code exportAsDrag} on the
* tree's {@code TransferHandler}.
*
* @param b whether or not to enable automatic drag handling
* @exception HeadlessException if
* <code>b</code> is <code>true</code> and
* <code>GraphicsEnvironment.isHeadless()</code>
* returns <code>true</code>
* @see java.awt.GraphicsEnvironment#isHeadless
* @see #getDragEnabled
* @see #setTransferHandler
* @see TransferHandler
* @since 1.4
*/
@BeanProperty(bound = false, description
= "determines whether automatic drag handling is enabled")
public void setDragEnabled(boolean b) {
checkDragEnabled(b);
dragEnabled = b;
}
private static void checkDragEnabled(boolean b) {
if (b && GraphicsEnvironment.isHeadless()) {
throw new HeadlessException();
}
}
/**
* Returns whether or not automatic drag handling is enabled.
*
* @return the value of the {@code dragEnabled} property
* @see #setDragEnabled
* @since 1.4
*/
public boolean getDragEnabled() {
return dragEnabled;
}
/**
* Sets the drop mode for this component. For backward compatibility,
* the default for this property is <code>DropMode.USE_SELECTION</code>.
* Usage of one of the other modes is recommended, however, for an
* improved user experience. <code>DropMode.ON</code>, for instance,
* offers similar behavior of showing items as selected, but does so without
* affecting the actual selection in the tree.
* <p>
* <code>JTree</code> supports the following drop modes:
* <ul>
* <li><code>DropMode.USE_SELECTION</code></li>
* <li><code>DropMode.ON</code></li>
* <li><code>DropMode.INSERT</code></li>
* <li><code>DropMode.ON_OR_INSERT</code></li>
* </ul>
* <p>
* The drop mode is only meaningful if this component has a
* <code>TransferHandler</code> that accepts drops.
*
* @param dropMode the drop mode to use
* @throws IllegalArgumentException if the drop mode is unsupported
* or <code>null</code>
* @see #getDropMode
* @see #getDropLocation
* @see #setTransferHandler
* @see TransferHandler
* @since 1.6
*/
public final void setDropMode(DropMode dropMode) {
checkDropMode(dropMode);
this.dropMode = dropMode;
}
private static void checkDropMode(DropMode dropMode) {
if (dropMode != null) {
switch (dropMode) {
case USE_SELECTION:
case ON:
case INSERT:
case ON_OR_INSERT:
return;
}
}
throw new IllegalArgumentException(dropMode +
": Unsupported drop mode for tree");
}
/**
* Returns the drop mode for this component.
*
* @return the drop mode for this component
* @see #setDropMode
* @since 1.6
*/
public final DropMode getDropMode() {
return dropMode;
}
/**
* Calculates a drop location in this component, representing where a
* drop at the given point should insert data.
*
* @param p the point to calculate a drop location for
* @return the drop location, or <code>null</code>
*/
DropLocation dropLocationForPoint(Point p) {
DropLocation location = null;
int row = getClosestRowForLocation(p.x, p.y);
Rectangle bounds = getRowBounds(row);
TreeModel model = getModel();
Object root = (model == null) ? null : model.getRoot();
TreePath rootPath = (root == null) ? null : new TreePath(root);
TreePath child;
TreePath parent;
boolean outside = row == -1
|| p.y < bounds.y
|| p.y >= bounds.y + bounds.height;
switch(dropMode) {
case USE_SELECTION:
case ON:
if (outside) {
location = new DropLocation(p, null, -1);
} else {
location = new DropLocation(p, getPathForRow(row), -1);
}
break;
case INSERT:
case ON_OR_INSERT:
if (row == -1) {
if (root != null && !model.isLeaf(root) && isExpanded(rootPath)) {
location = new DropLocation(p, rootPath, 0);
} else {
location = new DropLocation(p, null, -1);
}
break;
}
boolean checkOn = dropMode == DropMode.ON_OR_INSERT
|| !model.isLeaf(getPathForRow(row).getLastPathComponent());
Section section = SwingUtilities2.liesInVertical(bounds, p, checkOn);
if(section == LEADING) {
child = getPathForRow(row);
parent = child.getParentPath();
} else if (section == TRAILING) {
int index = row + 1;
if (index >= getRowCount()) {
if (model.isLeaf(root) || !isExpanded(rootPath)) {
location = new DropLocation(p, null, -1);
} else {
parent = rootPath;
index = model.getChildCount(root);
location = new DropLocation(p, parent, index);
}
break;
}
child = getPathForRow(index);
parent = child.getParentPath();
TreePath prev = getPathForRow(row).getParentPath();
if (prev != null && !prev.equals(parent)) {
location = new DropLocation(p, prev,
model.getChildCount(prev.getLastPathComponent()));
break;
}
} else {
assert checkOn;
location = new DropLocation(p, getPathForRow(row), -1);
break;
}
if (parent != null) {
location = new DropLocation(p, parent,
model.getIndexOfChild(parent.getLastPathComponent(),
child.getLastPathComponent()));
} else if (checkOn || !model.isLeaf(root)) {
location = new DropLocation(p, rootPath, -1);
} else {
location = new DropLocation(p, null, -1);
}
break;
default:
assert false : "Unexpected drop mode";
}
if (outside || row != expandRow) {
cancelDropTimer();
}
if (!outside && row != expandRow) {
if (isCollapsed(row)) {
expandRow = row;
startDropTimer();
}
}
return location;
}
/**
* Called to set or clear the drop location during a DnD operation.
* In some cases, the component may need to use it's internal selection
* temporarily to indicate the drop location. To help facilitate this,
* this method returns and accepts as a parameter a state object.
* This state object can be used to store, and later restore, the selection
* state. Whatever this method returns will be passed back to it in
* future calls, as the state parameter. If it wants the DnD system to
* continue storing the same state, it must pass it back every time.
* Here's how this is used:
* <p>
* Let's say that on the first call to this method the component decides
* to save some state (because it is about to use the selection to show
* a drop index). It can return a state object to the caller encapsulating
* any saved selection state. On a second call, let's say the drop location
* is being changed to something else. The component doesn't need to
* restore anything yet, so it simply passes back the same state object
* to have the DnD system continue storing it. Finally, let's say this
* method is messaged with <code>null</code>. This means DnD
* is finished with this component for now, meaning it should restore
* state. At this point, it can use the state parameter to restore
* said state, and of course return <code>null</code> since there's
* no longer anything to store.
*
* @param location the drop location (as calculated by
* <code>dropLocationForPoint</code>) or <code>null</code>
* if there's no longer a valid drop location
* @param state the state object saved earlier for this component,
* or <code>null</code>
* @param forDrop whether or not the method is being called because an
* actual drop occurred
* @return any saved state for this component, or <code>null</code> if none
*/
Object setDropLocation(TransferHandler.DropLocation location,
Object state,
boolean forDrop) {
Object retVal = null;
DropLocation treeLocation = (DropLocation)location;
if (dropMode == DropMode.USE_SELECTION) {
if (treeLocation == null) {
if (!forDrop && state != null) {
setSelectionPaths(((TreePath[][])state)[0]);
setAnchorSelectionPath(((TreePath[][])state)[1][0]);
setLeadSelectionPath(((TreePath[][])state)[1][1]);
}
} else {
if (dropLocation == null) {
TreePath[] paths = getSelectionPaths();
if (paths == null) {
paths = new TreePath[0];
}
retVal = new TreePath[][] {paths,
{getAnchorSelectionPath(), getLeadSelectionPath()}};
} else {
retVal = state;
}
setSelectionPath(treeLocation.getPath());
}
}
DropLocation old = dropLocation;
dropLocation = treeLocation;
firePropertyChange("dropLocation", old, dropLocation);
return retVal;
}
/**
* Called to indicate to this component that DnD is done.
* Allows for us to cancel the expand timer.
*/
void dndDone() {
cancelDropTimer();
dropTimer = null;
}
/**
* Returns the location that this component should visually indicate
* as the drop location during a DnD operation over the component,
* or {@code null} if no location is to currently be shown.
* <p>
* This method is not meant for querying the drop location
* from a {@code TransferHandler}, as the drop location is only
* set after the {@code TransferHandler}'s <code>canImport</code>
* has returned and has allowed for the location to be shown.
* <p>
* When this property changes, a property change event with
* name "dropLocation" is fired by the component.
*
* @return the drop location
* @see #setDropMode
* @see TransferHandler#canImport(TransferHandler.TransferSupport)
* @since 1.6
*/
@BeanProperty(bound = false)
public final DropLocation getDropLocation() {
return dropLocation;
}
private void startDropTimer() {
if (dropTimer == null) {
dropTimer = new TreeTimer();
}
dropTimer.start();
}
private void cancelDropTimer() {
if (dropTimer != null && dropTimer.isRunning()) {
expandRow = -1;
dropTimer.stop();
}
}
/**
* Returns <code>isEditable</code>. This is invoked from the UI before
* editing begins to insure that the given path can be edited. This
* is provided as an entry point for subclassers to add filtered
* editing without having to resort to creating a new editor.
*
* @param path a {@code TreePath} identifying a node
* @return true if every parent node and the node itself is editable
* @see #isEditable
*/
public boolean isPathEditable(TreePath path) {
return isEditable();
}
/**
* Overrides <code>JComponent</code>'s <code>getToolTipText</code>
* method in order to allow
* renderer's tips to be used if it has text set.
* <p>
* NOTE: For <code>JTree</code> to properly display tooltips of its
* renderers, <code>JTree</code> must be a registered component with the
* <code>ToolTipManager</code>. This can be done by invoking
* <code>ToolTipManager.sharedInstance().registerComponent(tree)</code>.
* This is not done automatically!
*
* @param event the <code>MouseEvent</code> that initiated the
* <code>ToolTip</code> display
* @return a string containing the tooltip or <code>null</code>
* if <code>event</code> is null
*/
public String getToolTipText(MouseEvent event) {
String tip = null;
if(event != null) {
Point p = event.getPoint();
int selRow = getRowForLocation(p.x, p.y);
TreeCellRenderer r = getCellRenderer();
if(selRow != -1 && r != null) {
TreePath path = getPathForRow(selRow);
Object lastPath = path.getLastPathComponent();
Component rComponent = r.getTreeCellRendererComponent
(this, lastPath, isRowSelected(selRow),
isExpanded(selRow), getModel().isLeaf(lastPath), selRow,
true);
if(rComponent instanceof JComponent) {
MouseEvent newEvent;
Rectangle pathBounds = getPathBounds(path);
p.translate(-pathBounds.x, -pathBounds.y);
@SuppressWarnings("deprecation")
final int modifiers = event.getModifiers();
newEvent = new MouseEvent(rComponent, event.getID(),
event.getWhen(), modifiers,
p.x, p.y,
event.getXOnScreen(),
event.getYOnScreen(),
event.getClickCount(),
event.isPopupTrigger(),
MouseEvent.NOBUTTON);
MouseEventAccessor meAccessor =
AWTAccessor.getMouseEventAccessor();
meAccessor.setCausedByTouchEvent(newEvent,
meAccessor.isCausedByTouchEvent(event));
tip = ((JComponent)rComponent).getToolTipText(newEvent);
}
}
}
// No tip from the renderer get our own tip
if (tip == null) {
tip = getToolTipText();
}
return tip;
}
/**
* Called by the renderers to convert the specified value to
* text. This implementation returns <code>value.toString</code>, ignoring
* all other arguments. To control the conversion, subclass this
* method and use any of the arguments you need.
*
* @param value the <code>Object</code> to convert to text
* @param selected true if the node is selected
* @param expanded true if the node is expanded
* @param leaf true if the node is a leaf node
* @param row an integer specifying the node's display row, where 0 is
* the first row in the display
* @param hasFocus true if the node has the focus
* @return the <code>String</code> representation of the node's value
*/
public String convertValueToText(Object value, boolean selected,
boolean expanded, boolean leaf, int row,
boolean hasFocus) {
if(value != null) {
String sValue = value.toString();
if (sValue != null) {
return sValue;
}
}
return "";
}
//
// The following are convenience methods that get forwarded to the
// current TreeUI.
//
/**
* Returns the number of viewable nodes. A node is viewable if all of its
* parents are expanded. The root is only included in this count if
* {@code isRootVisible()} is {@code true}. This returns {@code 0} if
* the UI has not been set.
*
* @return the number of viewable nodes
*/
@BeanProperty(bound = false)
public int getRowCount() {
TreeUI tree = getUI();
if(tree != null)
return tree.getRowCount(this);
return 0;
}
/**
* Selects the node identified by the specified path. If any
* component of the path is hidden (under a collapsed node), and
* <code>getExpandsSelectedPaths</code> is true it is
* exposed (made viewable).
*
* @param path the <code>TreePath</code> specifying the node to select
*/
public void setSelectionPath(TreePath path) {
getSelectionModel().setSelectionPath(path);
}
/**
* Selects the nodes identified by the specified array of paths.
* If any component in any of the paths is hidden (under a collapsed
* node), and <code>getExpandsSelectedPaths</code> is true
* it is exposed (made viewable).
*
* @param paths an array of <code>TreePath</code> objects that specifies
* the nodes to select
*/
public void setSelectionPaths(TreePath[] paths) {
getSelectionModel().setSelectionPaths(paths);
}
/**
* Sets the path identifies as the lead. The lead may not be selected.
* The lead is not maintained by <code>JTree</code>,
* rather the UI will update it.
* <p>
* This is a bound property.
*
* @param newPath the new lead path
* @since 1.3
*/
@BeanProperty(description
= "Lead selection path")
public void setLeadSelectionPath(TreePath newPath) {
TreePath oldValue = leadPath;
leadPath = newPath;
firePropertyChange(LEAD_SELECTION_PATH_PROPERTY, oldValue, newPath);
// Fire the active descendant property change here since the
// leadPath got set, this is triggered both in case node
// selection changed and node focus changed
if (accessibleContext != null){
((AccessibleJTree)accessibleContext).
fireActiveDescendantPropertyChange(oldValue, newPath);
}
}
/**
* Sets the path identified as the anchor.
* The anchor is not maintained by <code>JTree</code>, rather the UI will
* update it.
* <p>
* This is a bound property.
*
* @param newPath the new anchor path
* @since 1.3
*/
@BeanProperty(description
= "Anchor selection path")
public void setAnchorSelectionPath(TreePath newPath) {
TreePath oldValue = anchorPath;
anchorPath = newPath;
firePropertyChange(ANCHOR_SELECTION_PATH_PROPERTY, oldValue, newPath);
}
/**
* Selects the node at the specified row in the display.
*
* @param row the row to select, where 0 is the first row in
* the display
*/
public void setSelectionRow(int row) {
int[] rows = { row };
setSelectionRows(rows);
}
/**
* Selects the nodes corresponding to each of the specified rows
* in the display. If a particular element of <code>rows</code> is
* < 0 or >= <code>getRowCount</code>, it will be ignored.
* If none of the elements
* in <code>rows</code> are valid rows, the selection will
* be cleared. That is it will be as if <code>clearSelection</code>
* was invoked.
*
* @param rows an array of ints specifying the rows to select,
* where 0 indicates the first row in the display
*/
public void setSelectionRows(int[] rows) {
TreeUI ui = getUI();
if(ui != null && rows != null) {
int numRows = rows.length;
TreePath[] paths = new TreePath[numRows];
for(int counter = 0; counter < numRows; counter++) {
paths[counter] = ui.getPathForRow(this, rows[counter]);
}
setSelectionPaths(paths);
}
}
/**
* Adds the node identified by the specified <code>TreePath</code>
* to the current selection. If any component of the path isn't
* viewable, and <code>getExpandsSelectedPaths</code> is true it is
* made viewable.
* <p>
* Note that <code>JTree</code> does not allow duplicate nodes to
* exist as children under the same parent -- each sibling must be
* a unique object.
*
* @param path the <code>TreePath</code> to add
*/
public void addSelectionPath(TreePath path) {
getSelectionModel().addSelectionPath(path);
}
/**
* Adds each path in the array of paths to the current selection. If
* any component of any of the paths isn't viewable and
* <code>getExpandsSelectedPaths</code> is true, it is
* made viewable.
* <p>
* Note that <code>JTree</code> does not allow duplicate nodes to
* exist as children under the same parent -- each sibling must be
* a unique object.
*
* @param paths an array of <code>TreePath</code> objects that specifies
* the nodes to add
*/
public void addSelectionPaths(TreePath[] paths) {
getSelectionModel().addSelectionPaths(paths);
}
/**
* Adds the path at the specified row to the current selection.
*
* @param row an integer specifying the row of the node to add,
* where 0 is the first row in the display
*/
public void addSelectionRow(int row) {
int[] rows = { row };
addSelectionRows(rows);
}
/**
* Adds the paths at each of the specified rows to the current selection.
*
* @param rows an array of ints specifying the rows to add,
* where 0 indicates the first row in the display
*/
public void addSelectionRows(int[] rows) {
TreeUI ui = getUI();
if(ui != null && rows != null) {
int numRows = rows.length;
TreePath[] paths = new TreePath[numRows];
for(int counter = 0; counter < numRows; counter++)
paths[counter] = ui.getPathForRow(this, rows[counter]);
addSelectionPaths(paths);
}
}
/**
* Returns the last path component of the selected path. This is
* a convenience method for
* {@code getSelectionModel().getSelectionPath().getLastPathComponent()}.
* This is typically only useful if the selection has one path.
*
* @return the last path component of the selected path, or
* <code>null</code> if nothing is selected
* @see TreePath#getLastPathComponent
*/
@BeanProperty(bound = false)
public Object getLastSelectedPathComponent() {
TreePath selPath = getSelectionModel().getSelectionPath();
if(selPath != null)
return selPath.getLastPathComponent();
return null;
}
/**
* Returns the path identified as the lead.
* @return path identified as the lead
*/
public TreePath getLeadSelectionPath() {
return leadPath;
}
/**
* Returns the path identified as the anchor.
* @return path identified as the anchor
* @since 1.3
*/
public TreePath getAnchorSelectionPath() {
return anchorPath;
}
/**
* Returns the path to the first selected node.
*
* @return the <code>TreePath</code> for the first selected node,
* or <code>null</code> if nothing is currently selected
*/
public TreePath getSelectionPath() {
return getSelectionModel().getSelectionPath();
}
/**
* Returns the paths of all selected values.
*
* @return an array of <code>TreePath</code> objects indicating the selected
* nodes, or <code>null</code> if nothing is currently selected
*/
public TreePath[] getSelectionPaths() {
TreePath[] selectionPaths = getSelectionModel().getSelectionPaths();
return (selectionPaths != null && selectionPaths.length > 0) ? selectionPaths : null;
}
/**
* Returns all of the currently selected rows. This method is simply
* forwarded to the <code>TreeSelectionModel</code>.
* If nothing is selected <code>null</code> or an empty array will
* be returned, based on the <code>TreeSelectionModel</code>
* implementation.
*
* @return an array of integers that identifies all currently selected rows
* where 0 is the first row in the display
*/
public int[] getSelectionRows() {
return getSelectionModel().getSelectionRows();
}
/**
* Returns the number of nodes selected.
*
* @return the number of nodes selected
*/
@BeanProperty(bound = false)
public int getSelectionCount() {
return selectionModel.getSelectionCount();
}
/**
* Returns the smallest selected row. If the selection is empty, or
* none of the selected paths are viewable, {@code -1} is returned.
*
* @return the smallest selected row
*/
@BeanProperty(bound = false)
public int getMinSelectionRow() {
return getSelectionModel().getMinSelectionRow();
}
/**
* Returns the largest selected row. If the selection is empty, or
* none of the selected paths are viewable, {@code -1} is returned.
*
* @return the largest selected row
*/
@BeanProperty(bound = false)
public int getMaxSelectionRow() {
return getSelectionModel().getMaxSelectionRow();
}
/**
* Returns the row index corresponding to the lead path.
*
* @return an integer giving the row index of the lead path,
* where 0 is the first row in the display; or -1
* if <code>leadPath</code> is <code>null</code>
*/
@BeanProperty(bound = false)
public int getLeadSelectionRow() {
TreePath leadPath = getLeadSelectionPath();
if (leadPath != null) {
return getRowForPath(leadPath);
}
return -1;
}
/**
* Returns true if the item identified by the path is currently selected.
*
* @param path a <code>TreePath</code> identifying a node
* @return true if the node is selected
*/
public boolean isPathSelected(TreePath path) {
return getSelectionModel().isPathSelected(path);
}
/**
* Returns true if the node identified by row is selected.
*
* @param row an integer specifying a display row, where 0 is the first
* row in the display
* @return true if the node is selected
*/
public boolean isRowSelected(int row) {
return getSelectionModel().isRowSelected(row);
}
/**
* Returns an <code>Enumeration</code> of the descendants of the
* path <code>parent</code> that
* are currently expanded. If <code>parent</code> is not currently
* expanded, this will return <code>null</code>.
* If you expand/collapse nodes while
* iterating over the returned <code>Enumeration</code>
* this may not return all
* the expanded paths, or may return paths that are no longer expanded.
*
* @param parent the path which is to be examined
* @return an <code>Enumeration</code> of the descendents of
* <code>parent</code>, or <code>null</code> if
* <code>parent</code> is not currently expanded
*/
public Enumeration<TreePath> getExpandedDescendants(TreePath parent) {
if(!isExpanded(parent))
return null;
Enumeration<TreePath> toggledPaths = expandedState.keys();
Vector<TreePath> elements = null;
TreePath path;
Object value;
if(toggledPaths != null) {
while(toggledPaths.hasMoreElements()) {
path = toggledPaths.nextElement();
value = expandedState.get(path);
// Add the path if it is expanded, a descendant of parent,
// and it is visible (all parents expanded). This is rather
// expensive!
if(path != parent && value != null &&
((Boolean)value).booleanValue() &&
parent.isDescendant(path) && isVisible(path)) {
if (elements == null) {
elements = new Vector<TreePath>();
}
elements.addElement(path);
}
}
}
if (elements == null) {
Set<TreePath> empty = Collections.emptySet();
return Collections.enumeration(empty);
}
return elements.elements();
}
/**
* Returns true if the node identified by the path has ever been
* expanded.
*
* @param path a {@code TreePath} identifying a node
* @return true if the <code>path</code> has ever been expanded
*/
public boolean hasBeenExpanded(TreePath path) {
return (path != null && expandedState.get(path) != null);
}
/**
* Returns true if the node identified by the path is currently expanded,
*
* @param path the <code>TreePath</code> specifying the node to check
* @return false if any of the nodes in the node's path are collapsed,
* true if all nodes in the path are expanded
*/
public boolean isExpanded(TreePath path) {
if(path == null)
return false;
Object value;
do{
value = expandedState.get(path);
if(value == null || !((Boolean)value).booleanValue())
return false;
} while( (path=path.getParentPath())!=null );
return true;
}
/**
* Returns true if the node at the specified display row is currently
* expanded.
*
* @param row the row to check, where 0 is the first row in the
* display
* @return true if the node is currently expanded, otherwise false
*/
public boolean isExpanded(int row) {
TreeUI tree = getUI();
if(tree != null) {
TreePath path = tree.getPathForRow(this, row);
if(path != null) {
Boolean value = expandedState.get(path);
return (value != null && value.booleanValue());
}
}
return false;
}
/**
* Returns true if the value identified by path is currently collapsed,
* this will return false if any of the values in path are currently
* not being displayed.
*
* @param path the <code>TreePath</code> to check
* @return true if any of the nodes in the node's path are collapsed,
* false if all nodes in the path are expanded
*/
public boolean isCollapsed(TreePath path) {
return !isExpanded(path);
}
/**
* Returns true if the node at the specified display row is collapsed.
*
* @param row the row to check, where 0 is the first row in the
* display
* @return true if the node is currently collapsed, otherwise false
*/
public boolean isCollapsed(int row) {
return !isExpanded(row);
}
/**
* Ensures that the node identified by path is currently viewable.
*
* @param path the <code>TreePath</code> to make visible
*/
public void makeVisible(TreePath path) {
if(path != null) {
TreePath parentPath = path.getParentPath();
if(parentPath != null) {
expandPath(parentPath);
}
}
}
/**
* Returns true if the value identified by path is currently viewable,
* which means it is either the root or all of its parents are expanded.
* Otherwise, this method returns false.
*
* @param path {@code TreePath} identifying a node
* @return true if the node is viewable, otherwise false
*/
public boolean isVisible(TreePath path) {
if(path != null) {
TreePath parentPath = path.getParentPath();
if(parentPath != null)
return isExpanded(parentPath);
// Root.
return true;
}
return false;
}
/**
* Returns the <code>Rectangle</code> that the specified node will be drawn
* into. Returns <code>null</code> if any component in the path is hidden
* (under a collapsed parent).
* <p>
* Note:<br>
* This method returns a valid rectangle, even if the specified
* node is not currently displayed.
*
* @param path the <code>TreePath</code> identifying the node
* @return the <code>Rectangle</code> the node is drawn in,
* or <code>null</code>
*/
public Rectangle getPathBounds(TreePath path) {
TreeUI tree = getUI();
if(tree != null)
return tree.getPathBounds(this, path);
return null;
}
/**
* Returns the <code>Rectangle</code> that the node at the specified row is
* drawn in.
*
* @param row the row to be drawn, where 0 is the first row in the
* display
* @return the <code>Rectangle</code> the node is drawn in
*/
public Rectangle getRowBounds(int row) {
return getPathBounds(getPathForRow(row));
}
/**
* Makes sure all the path components in path are expanded (except
* for the last path component) and scrolls so that the
* node identified by the path is displayed. Only works when this
* <code>JTree</code> is contained in a <code>JScrollPane</code>.
*
* @param path the <code>TreePath</code> identifying the node to
* bring into view
*/
public void scrollPathToVisible(TreePath path) {
if(path != null) {
makeVisible(path);
Rectangle bounds = getPathBounds(path);
if(bounds != null) {
scrollRectToVisible(bounds);
if (accessibleContext != null) {
((AccessibleJTree)accessibleContext).fireVisibleDataPropertyChange();
}
}
}
}
/**
* Scrolls the item identified by row until it is displayed. The minimum
* of amount of scrolling necessary to bring the row into view
* is performed. Only works when this <code>JTree</code> is contained in a
* <code>JScrollPane</code>.
*
* @param row an integer specifying the row to scroll, where 0 is the
* first row in the display
*/
public void scrollRowToVisible(int row) {
scrollPathToVisible(getPathForRow(row));
}
/**
* Returns the path for the specified row. If <code>row</code> is
* not visible, or a {@code TreeUI} has not been set, <code>null</code>
* is returned.
*
* @param row an integer specifying a row
* @return the <code>TreePath</code> to the specified node,
* <code>null</code> if <code>row < 0</code>
* or <code>row >= getRowCount()</code>
*/
@BeanProperty(bound = false)
public TreePath getPathForRow(int row) {
TreeUI tree = getUI();
if(tree != null)
return tree.getPathForRow(this, row);
return null;
}
/**
* Returns the row that displays the node identified by the specified
* path.
*
* @param path the <code>TreePath</code> identifying a node
* @return an integer specifying the display row, where 0 is the first
* row in the display, or -1 if any of the elements in path
* are hidden under a collapsed parent.
*/
public int getRowForPath(TreePath path) {
TreeUI tree = getUI();
if(tree != null)
return tree.getRowForPath(this, path);
return -1;
}
/**
* Ensures that the node identified by the specified path is
* expanded and viewable. If the last item in the path is a
* leaf, this will have no effect.
*
* @param path the <code>TreePath</code> identifying a node
*/
public void expandPath(TreePath path) {
// Only expand if not leaf!
TreeModel model = getModel();
if(path != null && model != null &&
!model.isLeaf(path.getLastPathComponent())) {
setExpandedState(path, true);
}
}
/**
* Ensures that the node in the specified row is expanded and
* viewable.
* <p>
* If <code>row</code> is < 0 or >= <code>getRowCount</code> this
* will have no effect.
*
* @param row an integer specifying a display row, where 0 is the
* first row in the display
*/
public void expandRow(int row) {
expandPath(getPathForRow(row));
}
/**
* Ensures that the node identified by the specified path is
* collapsed and viewable.
*
* @param path the <code>TreePath</code> identifying a node
*/
public void collapsePath(TreePath path) {
setExpandedState(path, false);
}
/**
* Ensures that the node in the specified row is collapsed.
* <p>
* If <code>row</code> is < 0 or >= <code>getRowCount</code> this
* will have no effect.
*
* @param row an integer specifying a display row, where 0 is the
* first row in the display
*/
public void collapseRow(int row) {
collapsePath(getPathForRow(row));
}
/**
* Returns the path for the node at the specified location.
*
* @param x an integer giving the number of pixels horizontally from
* the left edge of the display area, minus any left margin
* @param y an integer giving the number of pixels vertically from
* the top of the display area, minus any top margin
* @return the <code>TreePath</code> for the node at that location
*/
public TreePath getPathForLocation(int x, int y) {
TreePath closestPath = getClosestPathForLocation(x, y);
if(closestPath != null) {
Rectangle pathBounds = getPathBounds(closestPath);
if(pathBounds != null &&
x >= pathBounds.x && x < (pathBounds.x + pathBounds.width) &&
y >= pathBounds.y && y < (pathBounds.y + pathBounds.height))
return closestPath;
}
return null;
}
/**
* Returns the row for the specified location.
*
* @param x an integer giving the number of pixels horizontally from
* the left edge of the display area, minus any left margin
* @param y an integer giving the number of pixels vertically from
* the top of the display area, minus any top margin
* @return the row corresponding to the location, or -1 if the
* location is not within the bounds of a displayed cell
* @see #getClosestRowForLocation
*/
public int getRowForLocation(int x, int y) {
return getRowForPath(getPathForLocation(x, y));
}
/**
* Returns the path to the node that is closest to x,y. If
* no nodes are currently viewable, or there is no model, returns
* <code>null</code>, otherwise it always returns a valid path. To test if
* the node is exactly at x, y, get the node's bounds and
* test x, y against that.
*
* @param x an integer giving the number of pixels horizontally from
* the left edge of the display area, minus any left margin
* @param y an integer giving the number of pixels vertically from
* the top of the display area, minus any top margin
* @return the <code>TreePath</code> for the node closest to that location,
* <code>null</code> if nothing is viewable or there is no model
*
* @see #getPathForLocation
* @see #getPathBounds
*/
public TreePath getClosestPathForLocation(int x, int y) {
TreeUI tree = getUI();
if(tree != null)
return tree.getClosestPathForLocation(this, x, y);
return null;
}
/**
* Returns the row to the node that is closest to x,y. If no nodes
* are viewable or there is no model, returns -1. Otherwise,
* it always returns a valid row. To test if the returned object is
* exactly at x, y, get the bounds for the node at the returned
* row and test x, y against that.
*
* @param x an integer giving the number of pixels horizontally from
* the left edge of the display area, minus any left margin
* @param y an integer giving the number of pixels vertically from
* the top of the display area, minus any top margin
* @return the row closest to the location, -1 if nothing is
* viewable or there is no model
*
* @see #getRowForLocation
* @see #getRowBounds
*/
public int getClosestRowForLocation(int x, int y) {
return getRowForPath(getClosestPathForLocation(x, y));
}
/**
* Returns true if the tree is being edited. The item that is being
* edited can be obtained using <code>getSelectionPath</code>.
*
* @return true if the user is currently editing a node
* @see #getSelectionPath
*/
@BeanProperty(bound = false)
public boolean isEditing() {
TreeUI tree = getUI();
if(tree != null)
return tree.isEditing(this);
return false;
}
/**
* Ends the current editing session.
* (The <code>DefaultTreeCellEditor</code>
* object saves any edits that are currently in progress on a cell.
* Other implementations may operate differently.)
* Has no effect if the tree isn't being edited.
* <blockquote>
* <b>Note:</b><br>
* To make edit-saves automatic whenever the user changes
* their position in the tree, use {@link #setInvokesStopCellEditing}.
* </blockquote>
*
* @return true if editing was in progress and is now stopped,
* false if editing was not in progress
*/
public boolean stopEditing() {
TreeUI tree = getUI();
if(tree != null)
return tree.stopEditing(this);
return false;
}
/**
* Cancels the current editing session. Has no effect if the
* tree isn't being edited.
*/
public void cancelEditing() {
TreeUI tree = getUI();
if(tree != null)
tree.cancelEditing(this);
}
/**
* Selects the node identified by the specified path and initiates
* editing. The edit-attempt fails if the <code>CellEditor</code>
* does not allow
* editing for the specified item.
*
* @param path the <code>TreePath</code> identifying a node
*/
public void startEditingAtPath(TreePath path) {
TreeUI tree = getUI();
if(tree != null)
tree.startEditingAtPath(this, path);
}
/**
* Returns the path to the element that is currently being edited.
*
* @return the <code>TreePath</code> for the node being edited
*/
@BeanProperty(bound = false)
public TreePath getEditingPath() {
TreeUI tree = getUI();
if(tree != null)
return tree.getEditingPath(this);
return null;
}
//
// Following are primarily convenience methods for mapping from
// row based selections to path selections. Sometimes it is
// easier to deal with these than paths (mouse downs, key downs
// usually just deal with index based selections).
// Since row based selections require a UI many of these won't work
// without one.
//
/**
* Sets the tree's selection model. When a <code>null</code> value is
* specified an empty
* <code>selectionModel</code> is used, which does not allow selections.
* <p>
* This is a bound property.
*
* @param selectionModel the <code>TreeSelectionModel</code> to use,
* or <code>null</code> to disable selections
* @see TreeSelectionModel
*/
@BeanProperty(description
= "The tree's selection model.")
public void setSelectionModel(TreeSelectionModel selectionModel) {
if(selectionModel == null)
selectionModel = EmptySelectionModel.sharedInstance();
TreeSelectionModel oldValue = this.selectionModel;
if (this.selectionModel != null && selectionRedirector != null) {
this.selectionModel.removeTreeSelectionListener
(selectionRedirector);
}
if (accessibleContext != null) {
this.selectionModel.removeTreeSelectionListener((TreeSelectionListener)accessibleContext);
selectionModel.addTreeSelectionListener((TreeSelectionListener)accessibleContext);
}
this.selectionModel = selectionModel;
if (selectionRedirector != null) {
this.selectionModel.addTreeSelectionListener(selectionRedirector);
}
firePropertyChange(SELECTION_MODEL_PROPERTY, oldValue,
this.selectionModel);
if (accessibleContext != null) {
accessibleContext.firePropertyChange(
AccessibleContext.ACCESSIBLE_SELECTION_PROPERTY,
Boolean.valueOf(false), Boolean.valueOf(true));
}
}
/**
* Returns the model for selections. This should always return a
* non-<code>null</code> value. If you don't want to allow anything
* to be selected
* set the selection model to <code>null</code>, which forces an empty
* selection model to be used.
*
* @return the model for selections
* @see #setSelectionModel
*/
public TreeSelectionModel getSelectionModel() {
return selectionModel;
}
/**
* Returns the paths (inclusive) between the specified rows. If
* the specified indices are within the viewable set of rows, or
* bound the viewable set of rows, then the indices are
* constrained by the viewable set of rows. If the specified
* indices are not within the viewable set of rows, or do not
* bound the viewable set of rows, then an empty array is
* returned. For example, if the row count is {@code 10}, and this
* method is invoked with {@code -1, 20}, then the specified
* indices are constrained to the viewable set of rows, and this is
* treated as if invoked with {@code 0, 9}. On the other hand, if
* this were invoked with {@code -10, -1}, then the specified
* indices do not bound the viewable set of rows, and an empty
* array is returned.
* <p>
* The parameters are not order dependent. That is, {@code
* getPathBetweenRows(x, y)} is equivalent to
* {@code getPathBetweenRows(y, x)}.
* <p>
* An empty array is returned if the row count is {@code 0}, or
* the specified indices do not bound the viewable set of rows.
*
* @param index0 the first index in the range
* @param index1 the last index in the range
* @return the paths (inclusive) between the specified row indices
*/
protected TreePath[] getPathBetweenRows(int index0, int index1) {
TreeUI tree = getUI();
if (tree != null) {
int rowCount = getRowCount();
if (rowCount > 0 && !((index0 < 0 && index1 < 0) ||
(index0 >= rowCount && index1 >= rowCount))){
index0 = Math.min(rowCount - 1, Math.max(index0, 0));
index1 = Math.min(rowCount - 1, Math.max(index1, 0));
int minIndex = Math.min(index0, index1);
int maxIndex = Math.max(index0, index1);
TreePath[] selection = new TreePath[
maxIndex - minIndex + 1];
for(int counter = minIndex; counter <= maxIndex; counter++) {
selection[counter - minIndex] =
tree.getPathForRow(this, counter);
}
return selection;
}
}
return new TreePath[0];
}
/**
* Selects the rows in the specified interval (inclusive). If
* the specified indices are within the viewable set of rows, or bound
* the viewable set of rows, then the specified rows are constrained by
* the viewable set of rows. If the specified indices are not within the
* viewable set of rows, or do not bound the viewable set of rows, then
* the selection is cleared. For example, if the row count is {@code
* 10}, and this method is invoked with {@code -1, 20}, then the
* specified indices bounds the viewable range, and this is treated as
* if invoked with {@code 0, 9}. On the other hand, if this were
* invoked with {@code -10, -1}, then the specified indices do not
* bound the viewable set of rows, and the selection is cleared.
* <p>
* The parameters are not order dependent. That is, {@code
* setSelectionInterval(x, y)} is equivalent to
* {@code setSelectionInterval(y, x)}.
*
* @param index0 the first index in the range to select
* @param index1 the last index in the range to select
*/
public void setSelectionInterval(int index0, int index1) {
TreePath[] paths = getPathBetweenRows(index0, index1);
this.getSelectionModel().setSelectionPaths(paths);
}
/**
* Adds the specified rows (inclusive) to the selection. If the
* specified indices are within the viewable set of rows, or bound
* the viewable set of rows, then the specified indices are
* constrained by the viewable set of rows. If the indices are not
* within the viewable set of rows, or do not bound the viewable
* set of rows, then the selection is unchanged. For example, if
* the row count is {@code 10}, and this method is invoked with
* {@code -1, 20}, then the specified indices bounds the viewable
* range, and this is treated as if invoked with {@code 0, 9}. On
* the other hand, if this were invoked with {@code -10, -1}, then
* the specified indices do not bound the viewable set of rows,
* and the selection is unchanged.
* <p>
* The parameters are not order dependent. That is, {@code
* addSelectionInterval(x, y)} is equivalent to
* {@code addSelectionInterval(y, x)}.
*
* @param index0 the first index in the range to add to the selection
* @param index1 the last index in the range to add to the selection
*/
public void addSelectionInterval(int index0, int index1) {
TreePath[] paths = getPathBetweenRows(index0, index1);
if (paths != null && paths.length > 0) {
this.getSelectionModel().addSelectionPaths(paths);
}
}
/**
* Removes the specified rows (inclusive) from the selection. If
* the specified indices are within the viewable set of rows, or bound
* the viewable set of rows, then the specified indices are constrained by
* the viewable set of rows. If the specified indices are not within the
* viewable set of rows, or do not bound the viewable set of rows, then
* the selection is unchanged. For example, if the row count is {@code
* 10}, and this method is invoked with {@code -1, 20}, then the
* specified range bounds the viewable range, and this is treated as
* if invoked with {@code 0, 9}. On the other hand, if this were
* invoked with {@code -10, -1}, then the specified range does not
* bound the viewable set of rows, and the selection is unchanged.
* <p>
* The parameters are not order dependent. That is, {@code
* removeSelectionInterval(x, y)} is equivalent to
* {@code removeSelectionInterval(y, x)}.
*
* @param index0 the first row to remove from the selection
* @param index1 the last row to remove from the selection
*/
public void removeSelectionInterval(int index0, int index1) {
TreePath[] paths = getPathBetweenRows(index0, index1);
if (paths != null && paths.length > 0) {
this.getSelectionModel().removeSelectionPaths(paths);
}
}
/**
* Removes the node identified by the specified path from the current
* selection.
*
* @param path the <code>TreePath</code> identifying a node
*/
public void removeSelectionPath(TreePath path) {
this.getSelectionModel().removeSelectionPath(path);
}
/**
* Removes the nodes identified by the specified paths from the
* current selection.
*
* @param paths an array of <code>TreePath</code> objects that
* specifies the nodes to remove
*/
public void removeSelectionPaths(TreePath[] paths) {
this.getSelectionModel().removeSelectionPaths(paths);
}
/**
* Removes the row at the index <code>row</code> from the current
* selection.
*
* @param row the row to remove
*/
public void removeSelectionRow(int row) {
int[] rows = { row };
removeSelectionRows(rows);
}
/**
* Removes the rows that are selected at each of the specified
* rows.
*
* @param rows an array of ints specifying display rows, where 0 is
* the first row in the display
*/
public void removeSelectionRows(int[] rows) {
TreeUI ui = getUI();
if(ui != null && rows != null) {
int numRows = rows.length;
TreePath[] paths = new TreePath[numRows];
for(int counter = 0; counter < numRows; counter++)
paths[counter] = ui.getPathForRow(this, rows[counter]);
removeSelectionPaths(paths);
}
}
/**
* Clears the selection.
*/
public void clearSelection() {
getSelectionModel().clearSelection();
}
/**
* Returns true if the selection is currently empty.
*
* @return true if the selection is currently empty
*/
@BeanProperty(bound = false)
public boolean isSelectionEmpty() {
return getSelectionModel().isSelectionEmpty();
}
/**
* Adds a listener for <code>TreeExpansion</code> events.
*
* @param tel a TreeExpansionListener that will be notified when
* a tree node is expanded or collapsed (a "negative
* expansion")
*/
public void addTreeExpansionListener(TreeExpansionListener tel) {
if (settingUI) {
uiTreeExpansionListener = tel;
}
listenerList.add(TreeExpansionListener.class, tel);
}
/**
* Removes a listener for <code>TreeExpansion</code> events.
*
* @param tel the <code>TreeExpansionListener</code> to remove
*/
public void removeTreeExpansionListener(TreeExpansionListener tel) {
listenerList.remove(TreeExpansionListener.class, tel);
if (uiTreeExpansionListener == tel) {
uiTreeExpansionListener = null;
}
}
/**
* Returns an array of all the <code>TreeExpansionListener</code>s added
* to this JTree with addTreeExpansionListener().
*
* @return all of the <code>TreeExpansionListener</code>s added or an empty
* array if no listeners have been added
* @since 1.4
*/
@BeanProperty(bound = false)
public TreeExpansionListener[] getTreeExpansionListeners() {
return listenerList.getListeners(TreeExpansionListener.class);
}
/**
* Adds a listener for <code>TreeWillExpand</code> events.
*
* @param tel a <code>TreeWillExpandListener</code> that will be notified
* when a tree node will be expanded or collapsed (a "negative
* expansion")
*/
public void addTreeWillExpandListener(TreeWillExpandListener tel) {
listenerList.add(TreeWillExpandListener.class, tel);
}
/**
* Removes a listener for <code>TreeWillExpand</code> events.
*
* @param tel the <code>TreeWillExpandListener</code> to remove
*/
public void removeTreeWillExpandListener(TreeWillExpandListener tel) {
listenerList.remove(TreeWillExpandListener.class, tel);
}
/**
* Returns an array of all the <code>TreeWillExpandListener</code>s added
* to this JTree with addTreeWillExpandListener().
*
* @return all of the <code>TreeWillExpandListener</code>s added or an empty
* array if no listeners have been added
* @since 1.4
*/
@BeanProperty(bound = false)
public TreeWillExpandListener[] getTreeWillExpandListeners() {
return listenerList.getListeners(TreeWillExpandListener.class);
}
/**
* Notifies all listeners that have registered interest for
* notification on this event type. The event instance
* is lazily created using the <code>path</code> parameter.
*
* @param path the <code>TreePath</code> indicating the node that was
* expanded
* @see EventListenerList
*/
public void fireTreeExpanded(TreePath path) {
// Guaranteed to return a non-null array
Object[] listeners = listenerList.getListenerList();
TreeExpansionEvent e = null;
if (uiTreeExpansionListener != null) {
e = new TreeExpansionEvent(this, path);
uiTreeExpansionListener.treeExpanded(e);
}
// Process the listeners last to first, notifying
// those that are interested in this event
for (int i = listeners.length-2; i>=0; i-=2) {
if (listeners[i]==TreeExpansionListener.class &&
listeners[i + 1] != uiTreeExpansionListener) {
// Lazily create the event:
if (e == null)
e = new TreeExpansionEvent(this, path);
((TreeExpansionListener)listeners[i+1]).
treeExpanded(e);
}
}
}
/**
* Notifies all listeners that have registered interest for
* notification on this event type. The event instance
* is lazily created using the <code>path</code> parameter.
*
* @param path the <code>TreePath</code> indicating the node that was
* collapsed
* @see EventListenerList
*/
public void fireTreeCollapsed(TreePath path) {
// Guaranteed to return a non-null array
Object[] listeners = listenerList.getListenerList();
TreeExpansionEvent e = null;
if (uiTreeExpansionListener != null) {
e = new TreeExpansionEvent(this, path);
uiTreeExpansionListener.treeCollapsed(e);
}
// Process the listeners last to first, notifying
// those that are interested in this event
for (int i = listeners.length-2; i>=0; i-=2) {
if (listeners[i]==TreeExpansionListener.class &&
listeners[i + 1] != uiTreeExpansionListener) {
// Lazily create the event:
if (e == null)
e = new TreeExpansionEvent(this, path);
((TreeExpansionListener)listeners[i+1]).
treeCollapsed(e);
}
}
}
/**
* Notifies all listeners that have registered interest for
* notification on this event type. The event instance
* is lazily created using the <code>path</code> parameter.
*
* @param path the <code>TreePath</code> indicating the node that was
* expanded
* @throws ExpandVetoException if the expansion is prevented from occurring
* @see EventListenerList
*/
public void fireTreeWillExpand(TreePath path) throws ExpandVetoException {
// Guaranteed to return a non-null array
Object[] listeners = listenerList.getListenerList();
TreeExpansionEvent e = null;
// Process the listeners last to first, notifying
// those that are interested in this event
for (int i = listeners.length-2; i>=0; i-=2) {
if (listeners[i]==TreeWillExpandListener.class) {
// Lazily create the event:
if (e == null)
e = new TreeExpansionEvent(this, path);
((TreeWillExpandListener)listeners[i+1]).
treeWillExpand(e);
}
}
}
/**
* Notifies all listeners that have registered interest for
* notification on this event type. The event instance
* is lazily created using the <code>path</code> parameter.
*
* @param path the <code>TreePath</code> indicating the node that was
* expanded
* @throws ExpandVetoException if the collapse is prevented from occurring
* @see EventListenerList
*/
public void fireTreeWillCollapse(TreePath path) throws ExpandVetoException {
// Guaranteed to return a non-null array
Object[] listeners = listenerList.getListenerList();
TreeExpansionEvent e = null;
// Process the listeners last to first, notifying
// those that are interested in this event
for (int i = listeners.length-2; i>=0; i-=2) {
if (listeners[i]==TreeWillExpandListener.class) {
// Lazily create the event:
if (e == null)
e = new TreeExpansionEvent(this, path);
((TreeWillExpandListener)listeners[i+1]).
treeWillCollapse(e);
}
}
}
/**
* Adds a listener for <code>TreeSelection</code> events.
*
* @param tsl the <code>TreeSelectionListener</code> that will be notified
* when a node is selected or deselected (a "negative
* selection")
*/
public void addTreeSelectionListener(TreeSelectionListener tsl) {
listenerList.add(TreeSelectionListener.class,tsl);
if(listenerList.getListenerCount(TreeSelectionListener.class) != 0
&& selectionRedirector == null) {
selectionRedirector = new TreeSelectionRedirector();
selectionModel.addTreeSelectionListener(selectionRedirector);
}
}
/**
* Removes a <code>TreeSelection</code> listener.
*
* @param tsl the <code>TreeSelectionListener</code> to remove
*/
public void removeTreeSelectionListener(TreeSelectionListener tsl) {
listenerList.remove(TreeSelectionListener.class,tsl);
if(listenerList.getListenerCount(TreeSelectionListener.class) == 0
&& selectionRedirector != null) {
selectionModel.removeTreeSelectionListener
(selectionRedirector);
selectionRedirector = null;
}
}
/**
* Returns an array of all the <code>TreeSelectionListener</code>s added
* to this JTree with addTreeSelectionListener().
*
* @return all of the <code>TreeSelectionListener</code>s added or an empty
* array if no listeners have been added
* @since 1.4
*/
@BeanProperty(bound = false)
public TreeSelectionListener[] getTreeSelectionListeners() {
return listenerList.getListeners(TreeSelectionListener.class);
}
/**
* Notifies all listeners that have registered interest for
* notification on this event type.
*
* @param e the <code>TreeSelectionEvent</code> to be fired;
* generated by the
* <code>TreeSelectionModel</code>
* when a node is selected or deselected
* @see EventListenerList
*/
protected void fireValueChanged(TreeSelectionEvent e) {
// Guaranteed to return a non-null array
Object[] listeners = listenerList.getListenerList();
// Process the listeners last to first, notifying
// those that are interested in this event
for (int i = listeners.length-2; i>=0; i-=2) {
// TreeSelectionEvent e = null;
if (listeners[i]==TreeSelectionListener.class) {
// Lazily create the event:
// if (e == null)
// e = new ListSelectionEvent(this, firstIndex, lastIndex);
((TreeSelectionListener)listeners[i+1]).valueChanged(e);
}
}
}
/**
* Sent when the tree has changed enough that we need to resize
* the bounds, but not enough that we need to remove the
* expanded node set (e.g nodes were expanded or collapsed, or
* nodes were inserted into the tree). You should never have to
* invoke this, the UI will invoke this as it needs to.
*/
public void treeDidChange() {
revalidate();
repaint();
}
/**
* Sets the number of rows that are to be displayed.
* This will only work if the tree is contained in a
* <code>JScrollPane</code>,
* and will adjust the preferred size and size of that scrollpane.
* <p>
* This is a bound property.
*
* @param newCount the number of rows to display
*/
@BeanProperty(description
= "The number of rows that are to be displayed.")
public void setVisibleRowCount(int newCount) {
int oldCount = visibleRowCount;
visibleRowCount = newCount;
firePropertyChange(VISIBLE_ROW_COUNT_PROPERTY, oldCount,
visibleRowCount);
invalidate();
if (accessibleContext != null) {
((AccessibleJTree)accessibleContext).fireVisibleDataPropertyChange();
}
}
/**
* Returns the number of rows that are displayed in the display area.
*
* @return the number of rows displayed
*/
public int getVisibleRowCount() {
return visibleRowCount;
}
/**
* Expands the root path, assuming the current TreeModel has been set.
*/
private void expandRoot() {
TreeModel model = getModel();
if(model != null && model.getRoot() != null) {
expandPath(new TreePath(model.getRoot()));
}
}
/**
* Returns the TreePath to the next tree element that
* begins with a prefix. To handle the conversion of a
* <code>TreePath</code> into a String, <code>convertValueToText</code>
* is used.
*
* @param prefix the string to test for a match
* @param startingRow the row for starting the search
* @param bias the search direction, either
* Position.Bias.Forward or Position.Bias.Backward.
* @return the TreePath of the next tree element that
* starts with the prefix; otherwise null
* @exception IllegalArgumentException if prefix is null
* or startingRow is out of bounds
* @since 1.4
*/
public TreePath getNextMatch(String prefix, int startingRow,
Position.Bias bias) {
int max = getRowCount();
if (prefix == null) {
throw new IllegalArgumentException();
}
if (startingRow < 0 || startingRow >= max) {
throw new IllegalArgumentException();
}
prefix = prefix.toUpperCase();
// start search from the next/previous element froom the
// selected element
int increment = (bias == Position.Bias.Forward) ? 1 : -1;
int row = startingRow;
do {
TreePath path = getPathForRow(row);
String text = convertValueToText(
path.getLastPathComponent(), isRowSelected(row),
isExpanded(row), true, row, false);
if (text.toUpperCase().startsWith(prefix)) {
return path;
}
row = (row + increment + max) % max;
} while (row != startingRow);
return null;
}
// Serialization support.
private void writeObject(ObjectOutputStream s) throws IOException {
Vector<Object> values = new Vector<Object>();
s.defaultWriteObject();
// Save the cellRenderer, if its Serializable.
if(cellRenderer != null && cellRenderer instanceof Serializable) {
values.addElement("cellRenderer");
values.addElement(cellRenderer);
}
// Save the cellEditor, if its Serializable.
if(cellEditor != null && cellEditor instanceof Serializable) {
values.addElement("cellEditor");
values.addElement(cellEditor);
}
// Save the treeModel, if its Serializable.
if(treeModel != null && treeModel instanceof Serializable) {
values.addElement("treeModel");
values.addElement(treeModel);
}
// Save the selectionModel, if its Serializable.
if(selectionModel != null && selectionModel instanceof Serializable) {
values.addElement("selectionModel");
values.addElement(selectionModel);
}
Object expandedData = getArchivableExpandedState();
if(expandedData != null) {
values.addElement("expandedState");
values.addElement(expandedData);
}
s.writeObject(values);
if (getUIClassID().equals(uiClassID)) {
byte count = JComponent.getWriteObjCounter(this);
JComponent.setWriteObjCounter(this, --count);
if (count == 0 && ui != null) {
ui.installUI(this);
}
}
}
private void readObject(ObjectInputStream s)
throws IOException, ClassNotFoundException {
ObjectInputStream.GetField f = s.readFields();
rootVisible = f.get("rootVisible", false);
rowHeight = f.get("rowHeight", 0);
rowHeightSet = f.get("rowHeightSet", false);
showsRootHandles = f.get("showsRootHandles", false);
showsRootHandlesSet = f.get("showsRootHandlesSet", false);
editable = f.get("editable", false);
largeModel = f.get("largeModel", false);
visibleRowCount = f.get("visibleRowCount", 0);
invokesStopCellEditing = f.get("invokesStopCellEditing", false);
scrollsOnExpand = f.get("scrollsOnExpand", false);
scrollsOnExpandSet = f.get("scrollsOnExpandSet", false);
toggleClickCount = f.get("toggleClickCount", 0);
leadPath = (TreePath) f.get("leadPath", null);
anchorPath = (TreePath) f.get("anchorPath", null);
expandsSelectedPaths = f.get("expandsSelectedPaths", false);
settingUI = f.get("settingUI", false);
boolean newDragEnabled = f.get("dragEnabled", false);
checkDragEnabled(newDragEnabled);
dragEnabled = newDragEnabled;
DropMode newDropMode = (DropMode) f.get("dropMode",
DropMode.USE_SELECTION);
checkDropMode(newDropMode);
dropMode = newDropMode;
expandRow = f.get("expandRow", -1);
dropTimer = (TreeTimer) f.get("dropTimer", null);
// Create an instance of expanded state.
expandedState = new Hashtable<TreePath, Boolean>();
expandedStack = new Stack<Stack<TreePath>>();
Vector<?> values = (Vector)s.readObject();
int indexCounter = 0;
int maxCounter = values.size();
if(indexCounter < maxCounter && values.elementAt(indexCounter).
equals("cellRenderer")) {
cellRenderer = (TreeCellRenderer)values.elementAt(++indexCounter);
indexCounter++;
}
if(indexCounter < maxCounter && values.elementAt(indexCounter).
equals("cellEditor")) {
cellEditor = (TreeCellEditor)values.elementAt(++indexCounter);
indexCounter++;
}
if(indexCounter < maxCounter && values.elementAt(indexCounter).
equals("treeModel")) {
treeModel = (TreeModel)values.elementAt(++indexCounter);
indexCounter++;
}
if(indexCounter < maxCounter && values.elementAt(indexCounter).
equals("selectionModel")) {
selectionModel = (TreeSelectionModel)values.elementAt(++indexCounter);
indexCounter++;
}
if(indexCounter < maxCounter && values.elementAt(indexCounter).
equals("expandedState")) {
unarchiveExpandedState(values.elementAt(++indexCounter));
indexCounter++;
}
// Reinstall the redirector.
if(listenerList.getListenerCount(TreeSelectionListener.class) != 0) {
selectionRedirector = new TreeSelectionRedirector();
selectionModel.addTreeSelectionListener(selectionRedirector);
}
// Listener to TreeModel.
if(treeModel != null) {
treeModelListener = createTreeModelListener();
if(treeModelListener != null)
treeModel.addTreeModelListener(treeModelListener);
}
}
/**
* Returns an object that can be archived indicating what nodes are
* expanded and what aren't. The objects from the model are NOT
* written out.
*/
private Object getArchivableExpandedState() {
TreeModel model = getModel();
if(model != null) {
Enumeration<TreePath> paths = expandedState.keys();
if(paths != null) {
Vector<Object> state = new Vector<Object>();
while(paths.hasMoreElements()) {
TreePath path = paths.nextElement();
Object archivePath;
try {
archivePath = getModelIndexsForPath(path);
} catch (Error error) {
archivePath = null;
}
if(archivePath != null) {
state.addElement(archivePath);
state.addElement(expandedState.get(path));
}
}
return state;
}
}
return null;
}
/**
* Updates the expanded state of nodes in the tree based on the
* previously archived state <code>state</code>.
*/
private void unarchiveExpandedState(Object state) {
if(state instanceof Vector) {
Vector<?> paths = (Vector)state;
for(int counter = paths.size() - 1; counter >= 0; counter--) {
Boolean eState = (Boolean)paths.elementAt(counter--);
TreePath path;
try {
path = getPathForIndexs((int[])paths.elementAt(counter));
if(path != null)
expandedState.put(path, eState);
} catch (Error error) {}
}
}
}
/**
* Returns an array of integers specifying the indexs of the
* components in the <code>path</code>. If <code>path</code> is
* the root, this will return an empty array. If <code>path</code>
* is <code>null</code>, <code>null</code> will be returned.
*/
private int[] getModelIndexsForPath(TreePath path) {
if(path != null) {
TreeModel model = getModel();
int count = path.getPathCount();
int[] indexs = new int[count - 1];
Object parent = model.getRoot();
for(int counter = 1; counter < count; counter++) {
indexs[counter - 1] = model.getIndexOfChild
(parent, path.getPathComponent(counter));
parent = path.getPathComponent(counter);
if(indexs[counter - 1] < 0)
return null;
}
return indexs;
}
return null;
}
/**
* Returns a <code>TreePath</code> created by obtaining the children
* for each of the indices in <code>indexs</code>. If <code>indexs</code>
* or the <code>TreeModel</code> is <code>null</code>, it will return
* <code>null</code>.
*/
private TreePath getPathForIndexs(int[] indexs) {
if(indexs == null)
return null;
TreeModel model = getModel();
if(model == null)
return null;
int count = indexs.length;
Object parent = model.getRoot();
if (parent == null)
return null;
TreePath parentPath = new TreePath(parent);
for(int counter = 0; counter < count; counter++) {
parent = model.getChild(parent, indexs[counter]);
if(parent == null)
return null;
parentPath = parentPath.pathByAddingChild(parent);
}
return parentPath;
}
/**
* <code>EmptySelectionModel</code> is a <code>TreeSelectionModel</code>
* that does not allow anything to be selected.
* <p>
* <strong>Warning:</strong>
* Serialized objects of this class will not be compatible with
* future Swing releases. The current serialization support is
* appropriate for short term storage or RMI between applications running
* the same version of Swing. As of 1.4, support for long term storage
* of all JavaBeans™
* has been added to the <code>java.beans</code> package.
* Please see {@link java.beans.XMLEncoder}.
*/
@SuppressWarnings("serial")
protected static class EmptySelectionModel extends
DefaultTreeSelectionModel
{
/**
* The single instance of {@code EmptySelectionModel}.
*/
protected static final EmptySelectionModel sharedInstance =
new EmptySelectionModel();
/**
* Returns the single instance of {@code EmptySelectionModel}.
*
* @return single instance of {@code EmptySelectionModel}
*/
public static EmptySelectionModel sharedInstance() {
return sharedInstance;
}
/**
* This is overriden to do nothing; {@code EmptySelectionModel}
* does not allow a selection.
*
* @param paths the paths to select; this is ignored
*/
public void setSelectionPaths(TreePath[] paths) {}
/**
* This is overriden to do nothing; {@code EmptySelectionModel}
* does not allow a selection.
*
* @param paths the paths to add to the selection; this is ignored
*/
public void addSelectionPaths(TreePath[] paths) {}
/**
* This is overriden to do nothing; {@code EmptySelectionModel}
* does not allow a selection.
*
* @param paths the paths to remove; this is ignored
*/
public void removeSelectionPaths(TreePath[] paths) {}
/**
* This is overriden to do nothing; {@code EmptySelectionModel}
* does not allow a selection.
*
* @param mode the selection mode; this is ignored
* @since 1.7
*/
public void setSelectionMode(int mode) {
}
/**
* This is overriden to do nothing; {@code EmptySelectionModel}
* does not allow a selection.
*
* @param mapper the {@code RowMapper} instance; this is ignored
* @since 1.7
*/
public void setRowMapper(RowMapper mapper) {
}
/**
* This is overriden to do nothing; {@code EmptySelectionModel}
* does not allow a selection.
*
* @param listener the listener to add; this is ignored
* @since 1.7
*/
public void addTreeSelectionListener(TreeSelectionListener listener) {
}
/**
* This is overriden to do nothing; {@code EmptySelectionModel}
* does not allow a selection.
*
* @param listener the listener to remove; this is ignored
* @since 1.7
*/
public void removeTreeSelectionListener(
TreeSelectionListener listener) {
}
/**
* This is overriden to do nothing; {@code EmptySelectionModel}
* does not allow a selection.
*
* @param listener the listener to add; this is ignored
* @since 1.7
*/
public void addPropertyChangeListener(
PropertyChangeListener listener) {
}
/**
* This is overriden to do nothing; {@code EmptySelectionModel}
* does not allow a selection.
*
* @param listener the listener to remove; this is ignored
* @since 1.7
*/
public void removePropertyChangeListener(
PropertyChangeListener listener) {
}
}
/**
* Handles creating a new <code>TreeSelectionEvent</code> with the
* <code>JTree</code> as the
* source and passing it off to all the listeners.
* <p>
* <strong>Warning:</strong>
* Serialized objects of this class will not be compatible with
* future Swing releases. The current serialization support is
* appropriate for short term storage or RMI between applications running
* the same version of Swing. As of 1.4, support for long term storage
* of all JavaBeans™
* has been added to the <code>java.beans</code> package.
* Please see {@link java.beans.XMLEncoder}.
*/
@SuppressWarnings("serial")
protected class TreeSelectionRedirector implements Serializable,
TreeSelectionListener
{
/**
* Invoked by the <code>TreeSelectionModel</code> when the
* selection changes.
*
* @param e the <code>TreeSelectionEvent</code> generated by the
* <code>TreeSelectionModel</code>
*/
public void valueChanged(TreeSelectionEvent e) {
TreeSelectionEvent newE;
newE = (TreeSelectionEvent)e.cloneWithSource(JTree.this);
fireValueChanged(newE);
}
} // End of class JTree.TreeSelectionRedirector
//
// Scrollable interface
//
/**
* Returns the preferred display size of a <code>JTree</code>. The height is
* determined from <code>getVisibleRowCount</code> and the width
* is the current preferred width.
*
* @return a <code>Dimension</code> object containing the preferred size
*/
@BeanProperty(bound = false)
public Dimension getPreferredScrollableViewportSize() {
int width = getPreferredSize().width;
int visRows = getVisibleRowCount();
int height = -1;
if(isFixedRowHeight())
height = visRows * getRowHeight();
else {
TreeUI ui = getUI();
if (ui != null && visRows > 0) {
int rc = ui.getRowCount(this);
if (rc >= visRows) {
Rectangle bounds = getRowBounds(visRows - 1);
if (bounds != null) {
height = bounds.y + bounds.height;
}
}
else if (rc > 0) {
Rectangle bounds = getRowBounds(0);
if (bounds != null) {
height = bounds.height * visRows;
}
}
}
if (height == -1) {
height = 16 * visRows;
}
}
return new Dimension(width, height);
}
/**
* Returns the amount to increment when scrolling. The amount is
* the height of the first displayed row that isn't completely in view
* or, if it is totally displayed, the height of the next row in the
* scrolling direction.
*
* @param visibleRect the view area visible within the viewport
* @param orientation either <code>SwingConstants.VERTICAL</code>
* or <code>SwingConstants.HORIZONTAL</code>
* @param direction less than zero to scroll up/left,
* greater than zero for down/right
* @return the "unit" increment for scrolling in the specified direction
* @see JScrollBar#setUnitIncrement(int)
*/
public int getScrollableUnitIncrement(Rectangle visibleRect,
int orientation, int direction) {
if(orientation == SwingConstants.VERTICAL) {
Rectangle rowBounds;
int firstIndex = getClosestRowForLocation
(0, visibleRect.y);
if(firstIndex != -1) {
rowBounds = getRowBounds(firstIndex);
if(rowBounds.y != visibleRect.y) {
if(direction < 0) {
// UP
return Math.max(0, (visibleRect.y - rowBounds.y));
}
return (rowBounds.y + rowBounds.height - visibleRect.y);
}
if(direction < 0) { // UP
if(firstIndex != 0) {
rowBounds = getRowBounds(firstIndex - 1);
return rowBounds.height;
}
}
else {
return rowBounds.height;
}
}
return 0;
}
return 4;
}
/**
* Returns the amount for a block increment, which is the height or
* width of <code>visibleRect</code>, based on <code>orientation</code>.
*
* @param visibleRect the view area visible within the viewport
* @param orientation either <code>SwingConstants.VERTICAL</code>
* or <code>SwingConstants.HORIZONTAL</code>
* @param direction less than zero to scroll up/left,
* greater than zero for down/right.
* @return the "block" increment for scrolling in the specified direction
* @see JScrollBar#setBlockIncrement(int)
*/
public int getScrollableBlockIncrement(Rectangle visibleRect,
int orientation, int direction) {
return (orientation == SwingConstants.VERTICAL) ? visibleRect.height :
visibleRect.width;
}
/**
* Returns false to indicate that the width of the viewport does not
* determine the width of the table, unless the preferred width of
* the tree is smaller than the viewports width. In other words:
* ensure that the tree is never smaller than its viewport.
*
* @return whether the tree should track the width of the viewport
* @see Scrollable#getScrollableTracksViewportWidth
*/
@BeanProperty(bound = false)
public boolean getScrollableTracksViewportWidth() {
Container parent = SwingUtilities.getUnwrappedParent(this);
if (parent instanceof JViewport) {
return parent.getWidth() > getPreferredSize().width;
}
return false;
}
/**
* Returns false to indicate that the height of the viewport does not
* determine the height of the table, unless the preferred height
* of the tree is smaller than the viewports height. In other words:
* ensure that the tree is never smaller than its viewport.
*
* @return whether the tree should track the height of the viewport
* @see Scrollable#getScrollableTracksViewportHeight
*/
@BeanProperty(bound = false)
public boolean getScrollableTracksViewportHeight() {
Container parent = SwingUtilities.getUnwrappedParent(this);
if (parent instanceof JViewport) {
return parent.getHeight() > getPreferredSize().height;
}
return false;
}
/**
* Sets the expanded state of this <code>JTree</code>.
* If <code>state</code> is
* true, all parents of <code>path</code> and path are marked as
* expanded. If <code>state</code> is false, all parents of
* <code>path</code> are marked EXPANDED, but <code>path</code> itself
* is marked collapsed.<p>
* This will fail if a <code>TreeWillExpandListener</code> vetos it.
*
* @param path a {@code TreePath} identifying a node
* @param state if {@code true}, all parents of @{code path} and path are marked as expanded.
* Otherwise, all parents of {@code path} are marked EXPANDED,
* but {@code path} itself is marked collapsed.
*/
protected void setExpandedState(TreePath path, boolean state) {
if(path != null) {
// Make sure all parents of path are expanded.
Stack<TreePath> stack;
TreePath parentPath = path.getParentPath();
if (expandedStack.size() == 0) {
stack = new Stack<TreePath>();
}
else {
stack = expandedStack.pop();
}
try {
while(parentPath != null) {
if(isExpanded(parentPath)) {
parentPath = null;
}
else {
stack.push(parentPath);
parentPath = parentPath.getParentPath();
}
}
for(int counter = stack.size() - 1; counter >= 0; counter--) {
parentPath = stack.pop();
if(!isExpanded(parentPath)) {
try {
fireTreeWillExpand(parentPath);
} catch (ExpandVetoException eve) {
// Expand vetoed!
return;
}
expandedState.put(parentPath, Boolean.TRUE);
fireTreeExpanded(parentPath);
if (accessibleContext != null) {
((AccessibleJTree)accessibleContext).
fireVisibleDataPropertyChange();
}
}
}
}
finally {
if (expandedStack.size() < TEMP_STACK_SIZE) {
stack.removeAllElements();
expandedStack.push(stack);
}
}
if(!state) {
// collapse last path.
Object cValue = expandedState.get(path);
if(cValue != null && ((Boolean)cValue).booleanValue()) {
try {
fireTreeWillCollapse(path);
}
catch (ExpandVetoException eve) {
return;
}
expandedState.put(path, Boolean.FALSE);
fireTreeCollapsed(path);
if (removeDescendantSelectedPaths(path, false) &&
!isPathSelected(path)) {
// A descendant was selected, select the parent.
addSelectionPath(path);
}
if (accessibleContext != null) {
((AccessibleJTree)accessibleContext).
fireVisibleDataPropertyChange();
}
}
}
else {
// Expand last path.
Object cValue = expandedState.get(path);
if(cValue == null || !((Boolean)cValue).booleanValue()) {
try {
fireTreeWillExpand(path);
}
catch (ExpandVetoException eve) {
return;
}
expandedState.put(path, Boolean.TRUE);
fireTreeExpanded(path);
if (accessibleContext != null) {
((AccessibleJTree)accessibleContext).
fireVisibleDataPropertyChange();
}
}
}
}
}
/**
* Returns an {@code Enumeration} of {@code TreePaths}
* that have been expanded that
* are descendants of {@code parent}.
*
* @param parent a path
* @return the {@code Enumeration} of {@code TreePaths}
*/
protected Enumeration<TreePath>
getDescendantToggledPaths(TreePath parent)
{
if(parent == null)
return null;
Vector<TreePath> descendants = new Vector<TreePath>();
Enumeration<TreePath> nodes = expandedState.keys();
while(nodes.hasMoreElements()) {
TreePath path = nodes.nextElement();
if(parent.isDescendant(path))
descendants.addElement(path);
}
return descendants.elements();
}
/**
* Removes any descendants of the <code>TreePaths</code> in
* <code>toRemove</code>
* that have been expanded.
*
* @param toRemove an enumeration of the paths to remove; a value of
* {@code null} is ignored
* @throws ClassCastException if {@code toRemove} contains an
* element that is not a {@code TreePath}; {@code null}
* values are ignored
*/
protected void
removeDescendantToggledPaths(Enumeration<TreePath> toRemove)
{
if(toRemove != null) {
while(toRemove.hasMoreElements()) {
Enumeration<?> descendants = getDescendantToggledPaths
(toRemove.nextElement());
if(descendants != null) {
while(descendants.hasMoreElements()) {
expandedState.remove(descendants.nextElement());
}
}
}
}
}
/**
* Clears the cache of toggled tree paths. This does NOT send out
* any <code>TreeExpansionListener</code> events.
*/
protected void clearToggledPaths() {
expandedState.clear();
}
/**
* Creates and returns an instance of <code>TreeModelHandler</code>.
* The returned
* object is responsible for updating the expanded state when the
* <code>TreeModel</code> changes.
* <p>
* For more information on what expanded state means, see the
* {@link JTree JTree description} above.
*
* @return the instance of {@code TreeModelHandler}
*/
protected TreeModelListener createTreeModelListener() {
return new TreeModelHandler();
}
/**
* Removes any paths in the selection that are descendants of
* <code>path</code>. If <code>includePath</code> is true and
* <code>path</code> is selected, it will be removed from the selection.
*
* @param path a path
* @param includePath is {@code true} and {@code path} is selected,
* it will be removed from the selection.
* @return true if a descendant was selected
* @since 1.3
*/
protected boolean removeDescendantSelectedPaths(TreePath path,
boolean includePath) {
TreePath[] toRemove = getDescendantSelectedPaths(path, includePath);
if (toRemove != null) {
getSelectionModel().removeSelectionPaths(toRemove);
return true;
}
return false;
}
/**
* Returns an array of paths in the selection that are descendants of
* <code>path</code>. The returned array may contain <code>null</code>s.
*/
private TreePath[] getDescendantSelectedPaths(TreePath path,
boolean includePath) {
TreeSelectionModel sm = getSelectionModel();
TreePath[] selPaths = (sm != null) ? sm.getSelectionPaths() :
null;
if(selPaths != null) {
boolean shouldRemove = false;
for(int counter = selPaths.length - 1; counter >= 0; counter--) {
if(selPaths[counter] != null &&
path.isDescendant(selPaths[counter]) &&
(!path.equals(selPaths[counter]) || includePath))
shouldRemove = true;
else
selPaths[counter] = null;
}
if(!shouldRemove) {
selPaths = null;
}
return selPaths;
}
return null;
}
/**
* Removes any paths from the selection model that are descendants of
* the nodes identified by in <code>e</code>.
*/
void removeDescendantSelectedPaths(TreeModelEvent e) {
TreePath pPath = SwingUtilities2.getTreePath(e, getModel());
Object[] oldChildren = e.getChildren();
TreeSelectionModel sm = getSelectionModel();
if (sm != null && pPath != null && oldChildren != null &&
oldChildren.length > 0) {
for (int counter = oldChildren.length - 1; counter >= 0;
counter--) {
// Might be better to call getDescendantSelectedPaths
// numerous times, then push to the model.
removeDescendantSelectedPaths(pPath.pathByAddingChild
(oldChildren[counter]), true);
}
}
}
/**
* Listens to the model and updates the <code>expandedState</code>
* accordingly when nodes are removed, or changed.
*/
protected class TreeModelHandler implements TreeModelListener {
public void treeNodesChanged(TreeModelEvent e) { }
public void treeNodesInserted(TreeModelEvent e) { }
public void treeStructureChanged(TreeModelEvent e) {
if(e == null)
return;
// NOTE: If I change this to NOT remove the descendants
// and update BasicTreeUIs treeStructureChanged method
// to update descendants in response to a treeStructureChanged
// event, all the children of the event won't collapse!
TreePath parent = SwingUtilities2.getTreePath(e, getModel());
if(parent == null)
return;
if (parent.getPathCount() == 1) {
// New root, remove everything!
clearToggledPaths();
Object treeRoot = treeModel.getRoot();
if(treeRoot != null &&
!treeModel.isLeaf(treeRoot)) {
// Mark the root as expanded, if it isn't a leaf.
expandedState.put(parent, Boolean.TRUE);
}
}
else if(expandedState.get(parent) != null) {
Vector<TreePath> toRemove = new Vector<TreePath>(1);
boolean isExpanded = isExpanded(parent);
toRemove.addElement(parent);
removeDescendantToggledPaths(toRemove.elements());
if(isExpanded) {
TreeModel model = getModel();
if(model == null || model.isLeaf
(parent.getLastPathComponent()))
collapsePath(parent);
else
expandedState.put(parent, Boolean.TRUE);
}
}
removeDescendantSelectedPaths(parent, false);
}
public void treeNodesRemoved(TreeModelEvent e) {
if(e == null)
return;
TreePath parent = SwingUtilities2.getTreePath(e, getModel());
Object[] children = e.getChildren();
if(children == null)
return;
TreePath rPath;
Vector<TreePath> toRemove
= new Vector<TreePath>(Math.max(1, children.length));
for(int counter = children.length - 1; counter >= 0; counter--) {
rPath = parent.pathByAddingChild(children[counter]);
if(expandedState.get(rPath) != null)
toRemove.addElement(rPath);
}
if(toRemove.size() > 0)
removeDescendantToggledPaths(toRemove.elements());
TreeModel model = getModel();
if(model == null || model.isLeaf(parent.getLastPathComponent()))
expandedState.remove(parent);
removeDescendantSelectedPaths(e);
}
}
/**
* <code>DynamicUtilTreeNode</code> can wrap
* vectors/hashtables/arrays/strings and
* create the appropriate children tree nodes as necessary. It is
* dynamic in that it will only create the children as necessary.
* <p>
* <strong>Warning:</strong>
* Serialized objects of this class will not be compatible with
* future Swing releases. The current serialization support is
* appropriate for short term storage or RMI between applications running
* the same version of Swing. As of 1.4, support for long term storage
* of all JavaBeans™
* has been added to the <code>java.beans</code> package.
* Please see {@link java.beans.XMLEncoder}.
*/
@SuppressWarnings("serial")
public static class DynamicUtilTreeNode extends DefaultMutableTreeNode {
/**
* Does the this <code>JTree</code> have children?
* This property is currently not implemented.
*/
protected boolean hasChildren;
/** Value to create children with. */
protected Object childValue;
/** Have the children been loaded yet? */
protected boolean loadedChildren;
/**
* Adds to parent all the children in <code>children</code>.
* If <code>children</code> is an array or vector all of its
* elements are added is children, otherwise if <code>children</code>
* is a hashtable all the key/value pairs are added in the order
* <code>Enumeration</code> returns them.
*
* @param parent the parent node
* @param children the children
*/
public static void createChildren(DefaultMutableTreeNode parent,
Object children) {
if(children instanceof Vector) {
Vector<?> childVector = (Vector)children;
for(int counter = 0, maxCounter = childVector.size();
counter < maxCounter; counter++)
parent.add(new DynamicUtilTreeNode
(childVector.elementAt(counter),
childVector.elementAt(counter)));
}
else if(children instanceof Hashtable) {
Hashtable<?,?> childHT = (Hashtable)children;
Enumeration<?> keys = childHT.keys();
Object aKey;
while(keys.hasMoreElements()) {
aKey = keys.nextElement();
parent.add(new DynamicUtilTreeNode(aKey,
childHT.get(aKey)));
}
}
else if(children instanceof Object[]) {
Object[] childArray = (Object[])children;
for(int counter = 0, maxCounter = childArray.length;
counter < maxCounter; counter++)
parent.add(new DynamicUtilTreeNode(childArray[counter],
childArray[counter]));
}
}
/**
* Creates a node with the specified object as its value and
* with the specified children. For the node to allow children,
* the children-object must be an array of objects, a
* <code>Vector</code>, or a <code>Hashtable</code> -- even
* if empty. Otherwise, the node is not
* allowed to have children.
*
* @param value the <code>Object</code> that is the value for the
* new node
* @param children an array of <code>Object</code>s, a
* <code>Vector</code>, or a <code>Hashtable</code>
* used to create the child nodes; if any other
* object is specified, or if the value is
* <code>null</code>,
* then the node is not allowed to have children
*/
public DynamicUtilTreeNode(Object value, Object children) {
super(value);
loadedChildren = false;
childValue = children;
if(children != null) {
if(children instanceof Vector)
setAllowsChildren(true);
else if(children instanceof Hashtable)
setAllowsChildren(true);
else if(children instanceof Object[])
setAllowsChildren(true);
else
setAllowsChildren(false);
}
else
setAllowsChildren(false);
}
/**
* Returns true if this node allows children. Whether the node
* allows children depends on how it was created.
*
* @return true if this node allows children, false otherwise
* @see JTree.DynamicUtilTreeNode
*/
public boolean isLeaf() {
return !getAllowsChildren();
}
/**
* Returns the number of child nodes.
*
* @return the number of child nodes
*/
public int getChildCount() {
if(!loadedChildren)
loadChildren();
return super.getChildCount();
}
/**
* Loads the children based on <code>childValue</code>.
* If <code>childValue</code> is a <code>Vector</code>
* or array each element is added as a child,
* if <code>childValue</code> is a <code>Hashtable</code>
* each key/value pair is added in the order that
* <code>Enumeration</code> returns the keys.
*/
protected void loadChildren() {
loadedChildren = true;
createChildren(this, childValue);
}
/**
* Subclassed to load the children, if necessary.
*/
public TreeNode getChildAt(int index) {
if(!loadedChildren)
loadChildren();
return super.getChildAt(index);
}
/**
* Subclassed to load the children, if necessary.
*/
public Enumeration<TreeNode> children() {
if(!loadedChildren)
loadChildren();
return super.children();
}
}
void setUIProperty(String propertyName, Object value) {
if (propertyName == "rowHeight") {
if (!rowHeightSet) {
setRowHeight(((Number)value).intValue());
rowHeightSet = false;
}
} else if (propertyName == "scrollsOnExpand") {
if (!scrollsOnExpandSet) {
setScrollsOnExpand(((Boolean)value).booleanValue());
scrollsOnExpandSet = false;
}
} else if (propertyName == "showsRootHandles") {
if (!showsRootHandlesSet) {
setShowsRootHandles(((Boolean)value).booleanValue());
showsRootHandlesSet = false;
}
} else {
super.setUIProperty(propertyName, value);
}
}
/**
* Returns a string representation of this <code>JTree</code>.
* This method
* is intended to be used only for debugging purposes, and the
* content and format of the returned string may vary between
* implementations. The returned string may be empty but may not
* be <code>null</code>.
*
* @return a string representation of this <code>JTree</code>.
*/
protected String paramString() {
String rootVisibleString = (rootVisible ?
"true" : "false");
String showsRootHandlesString = (showsRootHandles ?
"true" : "false");
String editableString = (editable ?
"true" : "false");
String largeModelString = (largeModel ?
"true" : "false");
String invokesStopCellEditingString = (invokesStopCellEditing ?
"true" : "false");
String scrollsOnExpandString = (scrollsOnExpand ?
"true" : "false");
return super.paramString() +
",editable=" + editableString +
",invokesStopCellEditing=" + invokesStopCellEditingString +
",largeModel=" + largeModelString +
",rootVisible=" + rootVisibleString +
",rowHeight=" + rowHeight +
",scrollsOnExpand=" + scrollsOnExpandString +
",showsRootHandles=" + showsRootHandlesString +
",toggleClickCount=" + toggleClickCount +
",visibleRowCount=" + visibleRowCount;
}
/////////////////
// Accessibility support
////////////////
/**
* Gets the AccessibleContext associated with this JTree.
* For JTrees, the AccessibleContext takes the form of an
* AccessibleJTree.
* A new AccessibleJTree instance is created if necessary.
*
* @return an AccessibleJTree that serves as the
* AccessibleContext of this JTree
*/
@BeanProperty(bound = false)
public AccessibleContext getAccessibleContext() {
if (accessibleContext == null) {
accessibleContext = new AccessibleJTree();
}
return accessibleContext;
}
/**
* This class implements accessibility support for the
* <code>JTree</code> class. It provides an implementation of the
* Java Accessibility API appropriate to tree user-interface elements.
* <p>
* <strong>Warning:</strong>
* Serialized objects of this class will not be compatible with
* future Swing releases. The current serialization support is
* appropriate for short term storage or RMI between applications running
* the same version of Swing. As of 1.4, support for long term storage
* of all JavaBeans™
* has been added to the <code>java.beans</code> package.
* Please see {@link java.beans.XMLEncoder}.
*/
@SuppressWarnings("serial")
protected class AccessibleJTree extends AccessibleJComponent
implements AccessibleSelection, TreeSelectionListener,
TreeModelListener, TreeExpansionListener {
TreePath leadSelectionPath;
Accessible leadSelectionAccessible;
/**
* Constructs {@code AccessibleJTree}
*/
public AccessibleJTree() {
// Add a tree model listener for JTree
TreeModel model = JTree.this.getModel();
if (model != null) {
model.addTreeModelListener(this);
}
JTree.this.addTreeExpansionListener(this);
JTree.this.addTreeSelectionListener(this);
leadSelectionPath = JTree.this.getLeadSelectionPath();
leadSelectionAccessible = (leadSelectionPath != null)
? new AccessibleJTreeNode(JTree.this,
leadSelectionPath,
JTree.this)
: null;
}
/**
* Tree Selection Listener value change method. Used to fire the
* property change
*
* @param e ListSelectionEvent
*
*/
public void valueChanged(TreeSelectionEvent e) {
firePropertyChange(AccessibleContext.ACCESSIBLE_SELECTION_PROPERTY,
Boolean.valueOf(false), Boolean.valueOf(true));
}
/**
* Fire a visible data property change notification.
* A 'visible' data property is one that represents
* something about the way the component appears on the
* display, where that appearance isn't bound to any other
* property. It notifies screen readers that the visual
* appearance of the component has changed, so they can
* notify the user.
*/
public void fireVisibleDataPropertyChange() {
firePropertyChange(AccessibleContext.ACCESSIBLE_VISIBLE_DATA_PROPERTY,
Boolean.valueOf(false), Boolean.valueOf(true));
}
// Fire the visible data changes for the model changes.
/**
* Tree Model Node change notification.
*
* @param e a Tree Model event
*/
public void treeNodesChanged(TreeModelEvent e) {
fireVisibleDataPropertyChange();
}
/**
* Tree Model Node change notification.
*
* @param e a Tree node insertion event
*/
public void treeNodesInserted(TreeModelEvent e) {
fireVisibleDataPropertyChange();
}
/**
* Tree Model Node change notification.
*
* @param e a Tree node(s) removal event
*/
public void treeNodesRemoved(TreeModelEvent e) {
fireVisibleDataPropertyChange();
}
/**
* Tree Model structure change change notification.
*
* @param e a Tree Model event
*/
public void treeStructureChanged(TreeModelEvent e) {
fireVisibleDataPropertyChange();
}
/**
* Tree Collapsed notification.
*
* @param e a TreeExpansionEvent
*/
public void treeCollapsed(TreeExpansionEvent e) {
fireVisibleDataPropertyChange();
TreePath path = e.getPath();
if (path != null) {
// Set parent to null so AccessibleJTreeNode computes
// its parent.
AccessibleJTreeNode node = new AccessibleJTreeNode(JTree.this,
path,
null);
PropertyChangeEvent pce = new PropertyChangeEvent(node,
AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
AccessibleState.EXPANDED,
AccessibleState.COLLAPSED);
firePropertyChange(AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
null, pce);
}
}
/**
* Tree Model Expansion notification.
*
* @param e a Tree node insertion event
*/
public void treeExpanded(TreeExpansionEvent e) {
fireVisibleDataPropertyChange();
TreePath path = e.getPath();
if (path != null) {
// TIGER - 4839971
// Set parent to null so AccessibleJTreeNode computes
// its parent.
AccessibleJTreeNode node = new AccessibleJTreeNode(JTree.this,
path,
null);
PropertyChangeEvent pce = new PropertyChangeEvent(node,
AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
AccessibleState.COLLAPSED,
AccessibleState.EXPANDED);
firePropertyChange(AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
null, pce);
}
}
/**
* Fire an active descendant property change notification.
* The active descendant is used for objects such as list,
* tree, and table, which may have transient children.
* It notifies screen readers the active child of the component
* has been changed so user can be notified from there.
*
* @param oldPath - lead path of previous active child
* @param newPath - lead path of current active child
*
*/
void fireActiveDescendantPropertyChange(TreePath oldPath, TreePath newPath){
if(oldPath != newPath){
Accessible oldLSA = (oldPath != null)
? new AccessibleJTreeNode(JTree.this,
oldPath,
null)
: null;
Accessible newLSA = (newPath != null)
? new AccessibleJTreeNode(JTree.this,
newPath,
null)
: null;
firePropertyChange(AccessibleContext.ACCESSIBLE_ACTIVE_DESCENDANT_PROPERTY,
oldLSA, newLSA);
}
}
private AccessibleContext getCurrentAccessibleContext() {
Component c = getCurrentComponent();
if (c instanceof Accessible) {
return c.getAccessibleContext();
} else {
return null;
}
}
private Component getCurrentComponent() {
// is the object visible?
// if so, get row, selected, focus & leaf state,
// and then get the renderer component and return it
TreeModel model = JTree.this.getModel();
if (model == null) {
return null;
}
Object treeRoot = model.getRoot();
if (treeRoot == null) {
return null;
}
TreePath path = new TreePath(treeRoot);
if (JTree.this.isVisible(path)) {
TreeCellRenderer r = JTree.this.getCellRenderer();
TreeUI ui = JTree.this.getUI();
if (ui != null) {
int row = ui.getRowForPath(JTree.this, path);
int lsr = JTree.this.getLeadSelectionRow();
boolean hasFocus = JTree.this.isFocusOwner()
&& (lsr == row);
boolean selected = JTree.this.isPathSelected(path);
boolean expanded = JTree.this.isExpanded(path);
return r.getTreeCellRendererComponent(JTree.this,
treeRoot, selected, expanded,
model.isLeaf(treeRoot), row, hasFocus);
}
}
return null;
}
// Overridden methods from AccessibleJComponent
/**
* Get the role of this object.
*
* @return an instance of AccessibleRole describing the role of the
* object
* @see AccessibleRole
*/
public AccessibleRole getAccessibleRole() {
return AccessibleRole.TREE;
}
/**
* Returns the <code>Accessible</code> child, if one exists,
* contained at the local coordinate <code>Point</code>.
* Otherwise returns <code>null</code>.
*
* @param p point in local coordinates of this <code>Accessible</code>
* @return the <code>Accessible</code>, if it exists,
* at the specified location; else <code>null</code>
*/
public Accessible getAccessibleAt(Point p) {
TreePath path = getClosestPathForLocation(p.x, p.y);
if (path != null) {
// JTree.this is NOT the parent; parent will get computed later
return new AccessibleJTreeNode(JTree.this, path, null);
} else {
return null;
}
}
/**
* Returns the number of top-level children nodes of this
* JTree. Each of these nodes may in turn have children nodes.
*
* @return the number of accessible children nodes in the tree.
*/
public int getAccessibleChildrenCount() {
TreeModel model = JTree.this.getModel();
if (model == null) {
return 0;
}
if (isRootVisible()) {
return 1; // the root node
}
Object treeRoot = model.getRoot();
if (treeRoot == null)
return 0;
// return the root's first set of children count
return model.getChildCount(treeRoot);
}
/**
* Return the nth Accessible child of the object.
*
* @param i zero-based index of child
* @return the nth Accessible child of the object
*/
public Accessible getAccessibleChild(int i) {
TreeModel model = JTree.this.getModel();
if (model == null) {
return null;
}
Object treeRoot = model.getRoot();
if (treeRoot == null) {
return null;
}
if (isRootVisible()) {
if (i == 0) { // return the root node Accessible
Object[] objPath = { treeRoot };
TreePath path = new TreePath(objPath);
return new AccessibleJTreeNode(JTree.this, path, JTree.this);
} else {
return null;
}
}
// return Accessible for one of root's child nodes
int count = model.getChildCount(treeRoot);
if (i < 0 || i >= count) {
return null;
}
Object obj = model.getChild(treeRoot, i);
if (obj == null)
return null;
Object[] objPath = {treeRoot, obj };
TreePath path = new TreePath(objPath);
return new AccessibleJTreeNode(JTree.this, path, JTree.this);
}
/**
* Get the index of this object in its accessible parent.
*
* @return the index of this object in its parent. Since a JTree
* top-level object does not have an accessible parent.
* @see #getAccessibleParent
*/
public int getAccessibleIndexInParent() {
// didn't ever need to override this...
return super.getAccessibleIndexInParent();
}
// AccessibleSelection methods
/**
* Get the AccessibleSelection associated with this object. In the
* implementation of the Java Accessibility API for this class,
* return this object, which is responsible for implementing the
* AccessibleSelection interface on behalf of itself.
*
* @return this object
*/
public AccessibleSelection getAccessibleSelection() {
return this;
}
/**
* Returns the number of items currently selected.
* If no items are selected, the return value will be 0.
*
* @return the number of items currently selected.
*/
public int getAccessibleSelectionCount() {
Object[] rootPath = new Object[1];
rootPath[0] = treeModel.getRoot();
if (rootPath[0] == null)
return 0;
TreePath childPath = new TreePath(rootPath);
if (JTree.this.isPathSelected(childPath)) {
return 1;
} else {
return 0;
}
}
/**
* Returns an Accessible representing the specified selected item
* in the object. If there isn't a selection, or there are
* fewer items selected than the integer passed in, the return
* value will be null.
*
* @param i the zero-based index of selected items
* @return an Accessible containing the selected item
*/
public Accessible getAccessibleSelection(int i) {
// The JTree can have only one accessible child, the root.
if (i == 0) {
Object[] rootPath = new Object[1];
rootPath[0] = treeModel.getRoot();
if (rootPath[0] == null)
return null;
TreePath childPath = new TreePath(rootPath);
if (JTree.this.isPathSelected(childPath)) {
return new AccessibleJTreeNode(JTree.this, childPath, JTree.this);
}
}
return null;
}
/**
* Returns true if the current child of this object is selected.
*
* @param i the zero-based index of the child in this Accessible object.
* @see AccessibleContext#getAccessibleChild
*/
public boolean isAccessibleChildSelected(int i) {
// The JTree can have only one accessible child, the root.
if (i == 0) {
Object[] rootPath = new Object[1];
rootPath[0] = treeModel.getRoot();
if (rootPath[0] == null)
return false;
TreePath childPath = new TreePath(rootPath);
return JTree.this.isPathSelected(childPath);
} else {
return false;
}
}
/**
* Adds the specified selected item in the object to the object's
* selection. If the object supports multiple selections,
* the specified item is added to any existing selection, otherwise
* it replaces any existing selection in the object. If the
* specified item is already selected, this method has no effect.
*
* @param i the zero-based index of selectable items
*/
public void addAccessibleSelection(int i) {
TreeModel model = JTree.this.getModel();
if (model != null) {
if (i == 0) {
Object[] objPath = {model.getRoot()};
if (objPath[0] == null)
return;
TreePath path = new TreePath(objPath);
JTree.this.addSelectionPath(path);
}
}
}
/**
* Removes the specified selected item in the object from the object's
* selection. If the specified item isn't currently selected, this
* method has no effect.
*
* @param i the zero-based index of selectable items
*/
public void removeAccessibleSelection(int i) {
TreeModel model = JTree.this.getModel();
if (model != null) {
if (i == 0) {
Object[] objPath = {model.getRoot()};
if (objPath[0] == null)
return;
TreePath path = new TreePath(objPath);
JTree.this.removeSelectionPath(path);
}
}
}
/**
* Clears the selection in the object, so that nothing in the
* object is selected.
*/
public void clearAccessibleSelection() {
int childCount = getAccessibleChildrenCount();
for (int i = 0; i < childCount; i++) {
removeAccessibleSelection(i);
}
}
/**
* Causes every selected item in the object to be selected
* if the object supports multiple selections.
*/
public void selectAllAccessibleSelection() {
TreeModel model = JTree.this.getModel();
if (model != null) {
Object[] objPath = {model.getRoot()};
if (objPath[0] == null)
return;
TreePath path = new TreePath(objPath);
JTree.this.addSelectionPath(path);
}
}
/**
* This class implements accessibility support for the
* <code>JTree</code> child. It provides an implementation of the
* Java Accessibility API appropriate to tree nodes.
*/
protected class AccessibleJTreeNode extends AccessibleContext
implements Accessible, AccessibleComponent, AccessibleSelection,
AccessibleAction {
private JTree tree = null;
private TreeModel treeModel = null;
private Object obj = null;
private TreePath path = null;
private Accessible accessibleParent = null;
private int index = 0;
private boolean isLeaf = false;
/**
* Constructs an AccessibleJTreeNode
*
* @param t an instance of {@code JTree}
* @param p an instance of {@code TreePath}
* @param ap an instance of {@code Accessible}
* @since 1.4
*/
public AccessibleJTreeNode(JTree t, TreePath p, Accessible ap) {
tree = t;
path = p;
accessibleParent = ap;
treeModel = t.getModel();
obj = p.getLastPathComponent();
if (treeModel != null) {
isLeaf = treeModel.isLeaf(obj);
}
}
private TreePath getChildTreePath(int i) {
// Tree nodes can't be so complex that they have
// two sets of children -> we're ignoring that case
if (i < 0 || i >= getAccessibleChildrenCount()) {
return null;
} else {
Object childObj = treeModel.getChild(obj, i);
Object[] objPath = path.getPath();
Object[] objChildPath = new Object[objPath.length+1];
java.lang.System.arraycopy(objPath, 0, objChildPath, 0, objPath.length);
objChildPath[objChildPath.length-1] = childObj;
return new TreePath(objChildPath);
}
}
/**
* Get the AccessibleContext associated with this tree node.
* In the implementation of the Java Accessibility API for
* this class, return this object, which is its own
* AccessibleContext.
*
* @return this object
*/
public AccessibleContext getAccessibleContext() {
return this;
}
private AccessibleContext getCurrentAccessibleContext() {
Component c = getCurrentComponent();
if (c instanceof Accessible) {
return c.getAccessibleContext();
} else {
return null;
}
}
private Component getCurrentComponent() {
// is the object visible?
// if so, get row, selected, focus & leaf state,
// and then get the renderer component and return it
if (tree.isVisible(path)) {
TreeCellRenderer r = tree.getCellRenderer();
if (r == null) {
return null;
}
TreeUI ui = tree.getUI();
if (ui != null) {
int row = ui.getRowForPath(JTree.this, path);
boolean selected = tree.isPathSelected(path);
boolean expanded = tree.isExpanded(path);
boolean hasFocus = false; // how to tell?? -PK
return r.getTreeCellRendererComponent(tree, obj,
selected, expanded, isLeaf, row, hasFocus);
}
}
return null;
}
// AccessibleContext methods
/**
* Get the accessible name of this object.
*
* @return the localized name of the object; null if this
* object does not have a name
*/
public String getAccessibleName() {
AccessibleContext ac = getCurrentAccessibleContext();
if (ac != null) {
String name = ac.getAccessibleName();
if ((name != null) && (name != "")) {
return ac.getAccessibleName();
} else {
return null;
}
}
if ((accessibleName != null) && (accessibleName != "")) {
return accessibleName;
} else {
// fall back to the client property
return (String)getClientProperty(AccessibleContext.ACCESSIBLE_NAME_PROPERTY);
}
}
/**
* Set the localized accessible name of this object.
*
* @param s the new localized name of the object.
*/
public void setAccessibleName(String s) {
AccessibleContext ac = getCurrentAccessibleContext();
if (ac != null) {
ac.setAccessibleName(s);
} else {
super.setAccessibleName(s);
}
}
//
// *** should check tooltip text for desc. (needs MouseEvent)
//
/**
* Get the accessible description of this object.
*
* @return the localized description of the object; null if
* this object does not have a description
*/
public String getAccessibleDescription() {
AccessibleContext ac = getCurrentAccessibleContext();
if (ac != null) {
return ac.getAccessibleDescription();
} else {
return super.getAccessibleDescription();
}
}
/**
* Set the accessible description of this object.
*
* @param s the new localized description of the object
*/
public void setAccessibleDescription(String s) {
AccessibleContext ac = getCurrentAccessibleContext();
if (ac != null) {
ac.setAccessibleDescription(s);
} else {
super.setAccessibleDescription(s);
}
}
/**
* Get the role of this object.
*
* @return an instance of AccessibleRole describing the role of the object
* @see AccessibleRole
*/
public AccessibleRole getAccessibleRole() {
AccessibleContext ac = getCurrentAccessibleContext();
if (ac != null) {
return ac.getAccessibleRole();
} else {
return AccessibleRole.UNKNOWN;
}
}
/**
* Get the state set of this object.
*
* @return an instance of AccessibleStateSet containing the
* current state set of the object
* @see AccessibleState
*/
public AccessibleStateSet getAccessibleStateSet() {
AccessibleContext ac = getCurrentAccessibleContext();
AccessibleStateSet states;
if (ac != null) {
states = ac.getAccessibleStateSet();
} else {
states = new AccessibleStateSet();
}
// need to test here, 'cause the underlying component
// is a cellRenderer, which is never showing...
if (isShowing()) {
states.add(AccessibleState.SHOWING);
} else if (states.contains(AccessibleState.SHOWING)) {
states.remove(AccessibleState.SHOWING);
}
if (isVisible()) {
states.add(AccessibleState.VISIBLE);
} else if (states.contains(AccessibleState.VISIBLE)) {
states.remove(AccessibleState.VISIBLE);
}
if (tree.isPathSelected(path)){
states.add(AccessibleState.SELECTED);
}
if (path == getLeadSelectionPath()) {
states.add(AccessibleState.ACTIVE);
}
if (!isLeaf) {
states.add(AccessibleState.EXPANDABLE);
}
if (tree.isExpanded(path)) {
states.add(AccessibleState.EXPANDED);
} else {
states.add(AccessibleState.COLLAPSED);
}
if (tree.isEditable()) {
states.add(AccessibleState.EDITABLE);
}
return states;
}
/**
* Get the Accessible parent of this object.
*
* @return the Accessible parent of this object; null if this
* object does not have an Accessible parent
*/
public Accessible getAccessibleParent() {
// someone wants to know, so we need to create our parent
// if we don't have one (hey, we're a talented kid!)
if (accessibleParent == null) {
Object[] objPath = path.getPath();
if (objPath.length > 1) {
Object objParent = objPath[objPath.length-2];
if (treeModel != null) {
index = treeModel.getIndexOfChild(objParent, obj);
}
Object[] objParentPath = new Object[objPath.length-1];
java.lang.System.arraycopy(objPath, 0, objParentPath,
0, objPath.length-1);
TreePath parentPath = new TreePath(objParentPath);
accessibleParent = new AccessibleJTreeNode(tree,
parentPath,
null);
this.setAccessibleParent(accessibleParent);
} else if (treeModel != null) {
accessibleParent = tree; // we're the top!
index = 0; // we're an only child!
this.setAccessibleParent(accessibleParent);
}
}
return accessibleParent;
}
/**
* Get the index of this object in its accessible parent.
*
* @return the index of this object in its parent; -1 if this
* object does not have an accessible parent.
* @see #getAccessibleParent
*/
public int getAccessibleIndexInParent() {
// index is invalid 'till we have an accessibleParent...
if (accessibleParent == null) {
getAccessibleParent();
}
Object[] objPath = path.getPath();
if (objPath.length > 1) {
Object objParent = objPath[objPath.length-2];
if (treeModel != null) {
index = treeModel.getIndexOfChild(objParent, obj);
}
}
return index;
}
/**
* Returns the number of accessible children in the object.
*
* @return the number of accessible children in the object.
*/
public int getAccessibleChildrenCount() {
// Tree nodes can't be so complex that they have
// two sets of children -> we're ignoring that case
return treeModel.getChildCount(obj);
}
/**
* Return the specified Accessible child of the object.
*
* @param i zero-based index of child
* @return the Accessible child of the object
*/
public Accessible getAccessibleChild(int i) {
// Tree nodes can't be so complex that they have
// two sets of children -> we're ignoring that case
if (i < 0 || i >= getAccessibleChildrenCount()) {
return null;
} else {
Object childObj = treeModel.getChild(obj, i);
Object[] objPath = path.getPath();
Object[] objChildPath = new Object[objPath.length+1];
java.lang.System.arraycopy(objPath, 0, objChildPath, 0, objPath.length);
objChildPath[objChildPath.length-1] = childObj;
TreePath childPath = new TreePath(objChildPath);
return new AccessibleJTreeNode(JTree.this, childPath, this);
}
}
/**
* Gets the locale of the component. If the component does not have
* a locale, then the locale of its parent is returned.
*
* @return This component's locale. If this component does not have
* a locale, the locale of its parent is returned.
* @exception IllegalComponentStateException
* If the Component does not have its own locale and has not yet
* been added to a containment hierarchy such that the locale can be
* determined from the containing parent.
* @see #setLocale
*/
public Locale getLocale() {
AccessibleContext ac = getCurrentAccessibleContext();
if (ac != null) {
return ac.getLocale();
} else {
return tree.getLocale();
}
}
/**
* Add a PropertyChangeListener to the listener list.
* The listener is registered for all properties.
*
* @param l The PropertyChangeListener to be added
*/
public void addPropertyChangeListener(PropertyChangeListener l) {
AccessibleContext ac = getCurrentAccessibleContext();
if (ac != null) {
ac.addPropertyChangeListener(l);
} else {
super.addPropertyChangeListener(l);
}
}
/**
* Remove a PropertyChangeListener from the listener list.
* This removes a PropertyChangeListener that was registered
* for all properties.
*
* @param l The PropertyChangeListener to be removed
*/
public void removePropertyChangeListener(PropertyChangeListener l) {
AccessibleContext ac = getCurrentAccessibleContext();
if (ac != null) {
ac.removePropertyChangeListener(l);
} else {
super.removePropertyChangeListener(l);
}
}
/**
* Get the AccessibleAction associated with this object. In the
* implementation of the Java Accessibility API for this class,
* return this object, which is responsible for implementing the
* AccessibleAction interface on behalf of itself.
*
* @return this object
*/
public AccessibleAction getAccessibleAction() {
return this;
}
/**
* Get the AccessibleComponent associated with this object. In the
* implementation of the Java Accessibility API for this class,
* return this object, which is responsible for implementing the
* AccessibleComponent interface on behalf of itself.
*
* @return this object
*/
public AccessibleComponent getAccessibleComponent() {
return this; // to override getBounds()
}
/**
* Get the AccessibleSelection associated with this object if one
* exists. Otherwise return null.
*
* @return the AccessibleSelection, or null
*/
public AccessibleSelection getAccessibleSelection() {
AccessibleContext ac = getCurrentAccessibleContext();
if (ac != null && isLeaf) {
return getCurrentAccessibleContext().getAccessibleSelection();
} else {
return this;
}
}
/**
* Get the AccessibleText associated with this object if one
* exists. Otherwise return null.
*
* @return the AccessibleText, or null
*/
public AccessibleText getAccessibleText() {
AccessibleContext ac = getCurrentAccessibleContext();
if (ac != null) {
return getCurrentAccessibleContext().getAccessibleText();
} else {
return null;
}
}
/**
* Get the AccessibleValue associated with this object if one
* exists. Otherwise return null.
*
* @return the AccessibleValue, or null
*/
public AccessibleValue getAccessibleValue() {
AccessibleContext ac = getCurrentAccessibleContext();
if (ac != null) {
return getCurrentAccessibleContext().getAccessibleValue();
} else {
return null;
}
}
// AccessibleComponent methods
/**
* Get the background color of this object.
*
* @return the background color, if supported, of the object;
* otherwise, null
*/
public Color getBackground() {
AccessibleContext ac = getCurrentAccessibleContext();
if (ac instanceof AccessibleComponent) {
return ((AccessibleComponent) ac).getBackground();
} else {
Component c = getCurrentComponent();
if (c != null) {
return c.getBackground();
} else {
return null;
}
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