JDK8/Java8源码在线阅读
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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* published by the Free Software Foundation. Oracle designates this
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*
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
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package javax.swing.text;
import com.sun.beans.util.Cache;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.beans.Transient;
import java.util.HashMap;
import java.util.Hashtable;
import java.util.Enumeration;
import java.util.Vector;
import java.util.concurrent.*;
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.print.*;
import java.awt.datatransfer.*;
import java.awt.im.InputContext;
import java.awt.im.InputMethodRequests;
import java.awt.font.TextHitInfo;
import java.awt.font.TextAttribute;
import java.awt.print.Printable;
import java.awt.print.PrinterException;
import javax.print.PrintService;
import javax.print.attribute.PrintRequestAttributeSet;
import java.text.*;
import java.text.AttributedCharacterIterator.Attribute;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.plaf.*;
import javax.accessibility.*;
import javax.print.attribute.*;
import sun.awt.AppContext;
import sun.swing.PrintingStatus;
import sun.swing.SwingUtilities2;
import sun.swing.text.TextComponentPrintable;
import sun.swing.SwingAccessor;
/**
* <code>JTextComponent</code> is the base class for swing text
* components. It tries to be compatible with the
* <code>java.awt.TextComponent</code> class
* where it can reasonably do so. Also provided are other services
* for additional flexibility (beyond the pluggable UI and bean
* support).
* You can find information on how to use the functionality
* this class provides in
* <a href="https://docs.oracle.com/javase/tutorial/uiswing/components/generaltext.html">General Rules for Using Text Components</a>,
* a section in <em>The Java Tutorial.</em>
*
* <dl>
* <dt><b><font size=+1>Caret Changes</font></b>
* <dd>
* The caret is a pluggable object in swing text components.
* Notification of changes to the caret position and the selection
* are sent to implementations of the <code>CaretListener</code>
* interface that have been registered with the text component.
* The UI will install a default caret unless a customized caret
* has been set. <br>
* By default the caret tracks all the document changes
* performed on the Event Dispatching Thread and updates it's position
* accordingly if an insertion occurs before or at the caret position
* or a removal occurs before the caret position. <code>DefaultCaret</code>
* tries to make itself visible which may lead to scrolling
* of a text component within <code>JScrollPane</code>. The default caret
* behavior can be changed by the {@link DefaultCaret#setUpdatePolicy} method.
* <br>
* <b>Note</b>: Non-editable text components also have a caret though
* it may not be painted.
*
* <dt><b><font size=+1>Commands</font></b>
* <dd>
* Text components provide a number of commands that can be used
* to manipulate the component. This is essentially the way that
* the component expresses its capabilities. These are expressed
* in terms of the swing <code>Action</code> interface,
* using the <code>TextAction</code> implementation.
* The set of commands supported by the text component can be
* found with the {@link #getActions} method. These actions
* can be bound to key events, fired from buttons, etc.
*
* <dt><b><font size=+1>Text Input</font></b>
* <dd>
* The text components support flexible and internationalized text input, using
* keymaps and the input method framework, while maintaining compatibility with
* the AWT listener model.
* <p>
* A {@link javax.swing.text.Keymap} lets an application bind key
* strokes to actions.
* In order to allow keymaps to be shared across multiple text components, they
* can use actions that extend <code>TextAction</code>.
* <code>TextAction</code> can determine which <code>JTextComponent</code>
* most recently has or had focus and therefore is the subject of
* the action (In the case that the <code>ActionEvent</code>
* sent to the action doesn't contain the target text component as its source).
* <p>
* The <a href="../../../../technotes/guides/imf/spec.html">input method framework</a>
* lets text components interact with input methods, separate software
* components that preprocess events to let users enter thousands of
* different characters using keyboards with far fewer keys.
* <code>JTextComponent</code> is an <em>active client</em> of
* the framework, so it implements the preferred user interface for interacting
* with input methods. As a consequence, some key events do not reach the text
* component because they are handled by an input method, and some text input
* reaches the text component as committed text within an {@link
* java.awt.event.InputMethodEvent} instead of as a key event.
* The complete text input is the combination of the characters in
* <code>keyTyped</code> key events and committed text in input method events.
* <p>
* The AWT listener model lets applications attach event listeners to
* components in order to bind events to actions. Swing encourages the
* use of keymaps instead of listeners, but maintains compatibility
* with listeners by giving the listeners a chance to steal an event
* by consuming it.
* <p>
* Keyboard event and input method events are handled in the following stages,
* with each stage capable of consuming the event:
*
* <table border=1 summary="Stages of keyboard and input method event handling">
* <tr>
* <th id="stage"><p style="text-align:left">Stage</p></th>
* <th id="ke"><p style="text-align:left">KeyEvent</p></th>
* <th id="ime"><p style="text-align:left">InputMethodEvent</p></th></tr>
* <tr><td headers="stage">1. </td>
* <td headers="ke">input methods </td>
* <td headers="ime">(generated here)</td></tr>
* <tr><td headers="stage">2. </td>
* <td headers="ke">focus manager </td>
* <td headers="ime"></td>
* </tr>
* <tr>
* <td headers="stage">3. </td>
* <td headers="ke">registered key listeners</td>
* <td headers="ime">registered input method listeners</tr>
* <tr>
* <td headers="stage">4. </td>
* <td headers="ke"></td>
* <td headers="ime">input method handling in JTextComponent</tr>
* <tr>
* <td headers="stage">5. </td><td headers="ke ime" colspan=2>keymap handling using the current keymap</td></tr>
* <tr><td headers="stage">6. </td><td headers="ke">keyboard handling in JComponent (e.g. accelerators, component navigation, etc.)</td>
* <td headers="ime"></td></tr>
* </table>
*
* <p>
* To maintain compatibility with applications that listen to key
* events but are not aware of input method events, the input
* method handling in stage 4 provides a compatibility mode for
* components that do not process input method events. For these
* components, the committed text is converted to keyTyped key events
* and processed in the key event pipeline starting at stage 3
* instead of in the input method event pipeline.
* <p>
* By default the component will create a keymap (named <b>DEFAULT_KEYMAP</b>)
* that is shared by all JTextComponent instances as the default keymap.
* Typically a look-and-feel implementation will install a different keymap
* that resolves to the default keymap for those bindings not found in the
* different keymap. The minimal bindings include:
* <ul>
* <li>inserting content into the editor for the
* printable keys.
* <li>removing content with the backspace and del
* keys.
* <li>caret movement forward and backward
* </ul>
*
* <dt><b><font size=+1>Model/View Split</font></b>
* <dd>
* The text components have a model-view split. A text component pulls
* together the objects used to represent the model, view, and controller.
* The text document model may be shared by other views which act as observers
* of the model (e.g. a document may be shared by multiple components).
*
* <p style="text-align:center"><img src="doc-files/editor.gif" alt="Diagram showing interaction between Controller, Document, events, and ViewFactory"
* HEIGHT=358 WIDTH=587></p>
*
* <p>
* The model is defined by the {@link Document} interface.
* This is intended to provide a flexible text storage mechanism
* that tracks change during edits and can be extended to more sophisticated
* models. The model interfaces are meant to capture the capabilities of
* expression given by SGML, a system used to express a wide variety of
* content.
* Each modification to the document causes notification of the
* details of the change to be sent to all observers in the form of a
* {@link DocumentEvent} which allows the views to stay up to date with the model.
* This event is sent to observers that have implemented the
* {@link DocumentListener}
* interface and registered interest with the model being observed.
*
* <dt><b><font size=+1>Location Information</font></b>
* <dd>
* The capability of determining the location of text in
* the view is provided. There are two methods, {@link #modelToView}
* and {@link #viewToModel} for determining this information.
*
* <dt><b><font size=+1>Undo/Redo support</font></b>
* <dd>
* Support for an edit history mechanism is provided to allow
* undo/redo operations. The text component does not itself
* provide the history buffer by default, but does provide
* the <code>UndoableEdit</code> records that can be used in conjunction
* with a history buffer to provide the undo/redo support.
* The support is provided by the Document model, which allows
* one to attach UndoableEditListener implementations.
*
* <dt><b><font size=+1>Thread Safety</font></b>
* <dd>
* The swing text components provide some support of thread
* safe operations. Because of the high level of configurability
* of the text components, it is possible to circumvent the
* protection provided. The protection primarily comes from
* the model, so the documentation of <code>AbstractDocument</code>
* describes the assumptions of the protection provided.
* The methods that are safe to call asynchronously are marked
* with comments.
*
* <dt><b><font size=+1>Newlines</font></b>
* <dd>
* For a discussion on how newlines are handled, see
* <a href="DefaultEditorKit.html">DefaultEditorKit</a>.
*
*
* <dt><b><font size=+1>Printing support</font></b>
* <dd>
* Several {@link #print print} methods are provided for basic
* document printing. If more advanced printing is needed, use the
* {@link #getPrintable} method.
* </dl>
*
* <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}.
*
* @beaninfo
* attribute: isContainer false
*
* @author Timothy Prinzing
* @author Igor Kushnirskiy (printing support)
* @see Document
* @see DocumentEvent
* @see DocumentListener
* @see Caret
* @see CaretEvent
* @see CaretListener
* @see TextUI
* @see View
* @see ViewFactory
*/
public abstract class JTextComponent extends JComponent implements Scrollable, Accessible
{
/**
* Creates a new <code>JTextComponent</code>.
* Listeners for caret events are established, and the pluggable
* UI installed. The component is marked as editable. No layout manager
* is used, because layout is managed by the view subsystem of text.
* The document model is set to <code>null</code>.
*/
public JTextComponent() {
super();
// enable InputMethodEvent for on-the-spot pre-editing
enableEvents(AWTEvent.KEY_EVENT_MASK | AWTEvent.INPUT_METHOD_EVENT_MASK);
caretEvent = new MutableCaretEvent(this);
addMouseListener(caretEvent);
addFocusListener(caretEvent);
setEditable(true);
setDragEnabled(false);
setLayout(null); // layout is managed by View hierarchy
updateUI();
}
/**
* Fetches the user-interface factory for this text-oriented editor.
*
* @return the factory
*/
public TextUI getUI() { return (TextUI)ui; }
/**
* Sets the user-interface factory for this text-oriented editor.
*
* @param ui the factory
*/
public void setUI(TextUI ui) {
super.setUI(ui);
}
/**
* Reloads the pluggable UI. The key used to fetch the
* new interface is <code>getUIClassID()</code>. The type of
* the UI is <code>TextUI</code>. <code>invalidate</code>
* is called after setting the UI.
*/
public void updateUI() {
setUI((TextUI)UIManager.getUI(this));
invalidate();
}
/**
* Adds a caret listener for notification of any changes
* to the caret.
*
* @param listener the listener to be added
* @see javax.swing.event.CaretEvent
*/
public void addCaretListener(CaretListener listener) {
listenerList.add(CaretListener.class, listener);
}
/**
* Removes a caret listener.
*
* @param listener the listener to be removed
* @see javax.swing.event.CaretEvent
*/
public void removeCaretListener(CaretListener listener) {
listenerList.remove(CaretListener.class, listener);
}
/**
* Returns an array of all the caret listeners
* registered on this text component.
*
* @return all of this component's <code>CaretListener</code>s
* or an empty
* array if no caret listeners are currently registered
*
* @see #addCaretListener
* @see #removeCaretListener
*
* @since 1.4
*/
public CaretListener[] getCaretListeners() {
return listenerList.getListeners(CaretListener.class);
}
/**
* Notifies all listeners that have registered interest for
* notification on this event type. The event instance
* is lazily created using the parameters passed into
* the fire method. The listener list is processed in a
* last-to-first manner.
*
* @param e the event
* @see EventListenerList
*/
protected void fireCaretUpdate(CaretEvent 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) {
if (listeners[i]==CaretListener.class) {
((CaretListener)listeners[i+1]).caretUpdate(e);
}
}
}
/**
* Associates the editor with a text document.
* The currently registered factory is used to build a view for
* the document, which gets displayed by the editor after revalidation.
* A PropertyChange event ("document") is propagated to each listener.
*
* @param doc the document to display/edit
* @see #getDocument
* @beaninfo
* description: the text document model
* bound: true
* expert: true
*/
public void setDocument(Document doc) {
Document old = model;
/*
* acquire a read lock on the old model to prevent notification of
* mutations while we disconnecting the old model.
*/
try {
if (old instanceof AbstractDocument) {
((AbstractDocument)old).readLock();
}
if (accessibleContext != null) {
model.removeDocumentListener(
((AccessibleJTextComponent)accessibleContext));
}
if (inputMethodRequestsHandler != null) {
model.removeDocumentListener((DocumentListener)inputMethodRequestsHandler);
}
model = doc;
// Set the document's run direction property to match the
// component's ComponentOrientation property.
Boolean runDir = getComponentOrientation().isLeftToRight()
? TextAttribute.RUN_DIRECTION_LTR
: TextAttribute.RUN_DIRECTION_RTL;
if (runDir != doc.getProperty(TextAttribute.RUN_DIRECTION)) {
doc.putProperty(TextAttribute.RUN_DIRECTION, runDir );
}
firePropertyChange("document", old, doc);
} finally {
if (old instanceof AbstractDocument) {
((AbstractDocument)old).readUnlock();
}
}
revalidate();
repaint();
if (accessibleContext != null) {
model.addDocumentListener(
((AccessibleJTextComponent)accessibleContext));
}
if (inputMethodRequestsHandler != null) {
model.addDocumentListener((DocumentListener)inputMethodRequestsHandler);
}
}
/**
* Fetches the model associated with the editor. This is
* primarily for the UI to get at the minimal amount of
* state required to be a text editor. Subclasses will
* return the actual type of the model which will typically
* be something that extends Document.
*
* @return the model
*/
public Document getDocument() {
return model;
}
// Override of Component.setComponentOrientation
public void setComponentOrientation( ComponentOrientation o ) {
// Set the document's run direction property to match the
// ComponentOrientation property.
Document doc = getDocument();
if( doc != null ) {
Boolean runDir = o.isLeftToRight()
? TextAttribute.RUN_DIRECTION_LTR
: TextAttribute.RUN_DIRECTION_RTL;
doc.putProperty( TextAttribute.RUN_DIRECTION, runDir );
}
super.setComponentOrientation( o );
}
/**
* Fetches the command list for the editor. This is
* the list of commands supported by the plugged-in UI
* augmented by the collection of commands that the
* editor itself supports. These are useful for binding
* to events, such as in a keymap.
*
* @return the command list
*/
public Action[] getActions() {
return getUI().getEditorKit(this).getActions();
}
/**
* Sets margin space between the text component's border
* and its text. The text component's default <code>Border</code>
* object will use this value to create the proper margin.
* However, if a non-default border is set on the text component,
* it is that <code>Border</code> object's responsibility to create the
* appropriate margin space (else this property will effectively
* be ignored). This causes a redraw of the component.
* A PropertyChange event ("margin") is sent to all listeners.
*
* @param m the space between the border and the text
* @beaninfo
* description: desired space between the border and text area
* bound: true
*/
public void setMargin(Insets m) {
Insets old = margin;
margin = m;
firePropertyChange("margin", old, m);
invalidate();
}
/**
* Returns the margin between the text component's border and
* its text.
*
* @return the margin
*/
public Insets getMargin() {
return margin;
}
/**
* Sets the <code>NavigationFilter</code>. <code>NavigationFilter</code>
* is used by <code>DefaultCaret</code> and the default cursor movement
* actions as a way to restrict the cursor movement.
*
* @since 1.4
*/
public void setNavigationFilter(NavigationFilter filter) {
navigationFilter = filter;
}
/**
* Returns the <code>NavigationFilter</code>. <code>NavigationFilter</code>
* is used by <code>DefaultCaret</code> and the default cursor movement
* actions as a way to restrict the cursor movement. A null return value
* implies the cursor movement and selection should not be restricted.
*
* @since 1.4
* @return the NavigationFilter
*/
public NavigationFilter getNavigationFilter() {
return navigationFilter;
}
/**
* Fetches the caret that allows text-oriented navigation over
* the view.
*
* @return the caret
*/
@Transient
public Caret getCaret() {
return caret;
}
/**
* Sets the caret to be used. By default this will be set
* by the UI that gets installed. This can be changed to
* a custom caret if desired. Setting the caret results in a
* PropertyChange event ("caret") being fired.
*
* @param c the caret
* @see #getCaret
* @beaninfo
* description: the caret used to select/navigate
* bound: true
* expert: true
*/
public void setCaret(Caret c) {
if (caret != null) {
caret.removeChangeListener(caretEvent);
caret.deinstall(this);
}
Caret old = caret;
caret = c;
if (caret != null) {
caret.install(this);
caret.addChangeListener(caretEvent);
}
firePropertyChange("caret", old, caret);
}
/**
* Fetches the object responsible for making highlights.
*
* @return the highlighter
*/
public Highlighter getHighlighter() {
return highlighter;
}
/**
* Sets the highlighter to be used. By default this will be set
* by the UI that gets installed. This can be changed to
* a custom highlighter if desired. The highlighter can be set to
* <code>null</code> to disable it.
* A PropertyChange event ("highlighter") is fired
* when a new highlighter is installed.
*
* @param h the highlighter
* @see #getHighlighter
* @beaninfo
* description: object responsible for background highlights
* bound: true
* expert: true
*/
public void setHighlighter(Highlighter h) {
if (highlighter != null) {
highlighter.deinstall(this);
}
Highlighter old = highlighter;
highlighter = h;
if (highlighter != null) {
highlighter.install(this);
}
firePropertyChange("highlighter", old, h);
}
/**
* Sets the keymap to use for binding events to
* actions. Setting to <code>null</code> effectively disables
* keyboard input.
* A PropertyChange event ("keymap") is fired when a new keymap
* is installed.
*
* @param map the keymap
* @see #getKeymap
* @beaninfo
* description: set of key event to action bindings to use
* bound: true
*/
public void setKeymap(Keymap map) {
Keymap old = keymap;
keymap = map;
firePropertyChange("keymap", old, keymap);
updateInputMap(old, map);
}
/**
* Turns on or off automatic drag handling. In order to enable automatic
* drag handling, this property should be set to {@code true}, and the
* component'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 component's
* {@code TextUI}. 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
* a selection 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
* component'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
*
* @beaninfo
* description: determines whether automatic drag handling is enabled
* bound: false
*/
public void setDragEnabled(boolean b) {
if (b && GraphicsEnvironment.isHeadless()) {
throw new HeadlessException();
}
dragEnabled = b;
}
/**
* 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 <code>DropMode.INSERT</code> is recommended, however,
* for an improved user experience. It offers similar behavior of dropping
* between text locations, but does so without affecting the actual text
* selection and caret location.
* <p>
* <code>JTextComponents</code> support the following drop modes:
* <ul>
* <li><code>DropMode.USE_SELECTION</code></li>
* <li><code>DropMode.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 javax.swing.TransferHandler
* @since 1.6
*/
public final void setDropMode(DropMode dropMode) {
if (dropMode != null) {
switch (dropMode) {
case USE_SELECTION:
case INSERT:
this.dropMode = dropMode;
return;
}
}
throw new IllegalArgumentException(dropMode + ": Unsupported drop mode for text");
}
/**
* 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;
}
static {
SwingAccessor.setJTextComponentAccessor(
new SwingAccessor.JTextComponentAccessor() {
public TransferHandler.DropLocation dropLocationForPoint(JTextComponent textComp,
Point p)
{
return textComp.dropLocationForPoint(p);
}
public Object setDropLocation(JTextComponent textComp,
TransferHandler.DropLocation location,
Object state, boolean forDrop)
{
return textComp.setDropLocation(location, state, forDrop);
}
});
}
/**
* Calculates a drop location in this component, representing where a
* drop at the given point should insert data.
* <p>
* Note: This method is meant to override
* <code>JComponent.dropLocationForPoint()</code>, which is package-private
* in javax.swing. <code>TransferHandler</code> will detect text components
* and call this method instead via reflection. It's name should therefore
* not be changed.
*
* @param p the point to calculate a drop location for
* @return the drop location, or <code>null</code>
*/
DropLocation dropLocationForPoint(Point p) {
Position.Bias[] bias = new Position.Bias[1];
int index = getUI().viewToModel(this, p, bias);
// viewToModel currently returns null for some HTML content
// when the point is within the component's top inset
if (bias[0] == null) {
bias[0] = Position.Bias.Forward;
}
return new DropLocation(p, index, bias[0]);
}
/**
* 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.
* <p>
* Note: This method is meant to override
* <code>JComponent.setDropLocation()</code>, which is package-private
* in javax.swing. <code>TransferHandler</code> will detect text components
* and call this method instead via reflection. It's name should therefore
* not be changed.
*
* @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 textLocation = (DropLocation)location;
if (dropMode == DropMode.USE_SELECTION) {
if (textLocation == null) {
if (state != null) {
/*
* This object represents the state saved earlier.
* If the caret is a DefaultCaret it will be
* an Object array containing, in order:
* - the saved caret mark (Integer)
* - the saved caret dot (Integer)
* - the saved caret visibility (Boolean)
* - the saved mark bias (Position.Bias)
* - the saved dot bias (Position.Bias)
* If the caret is not a DefaultCaret it will
* be similar, but will not contain the dot
* or mark bias.
*/
Object[] vals = (Object[])state;
if (!forDrop) {
if (caret instanceof DefaultCaret) {
((DefaultCaret)caret).setDot(((Integer)vals[0]).intValue(),
(Position.Bias)vals[3]);
((DefaultCaret)caret).moveDot(((Integer)vals[1]).intValue(),
(Position.Bias)vals[4]);
} else {
caret.setDot(((Integer)vals[0]).intValue());
caret.moveDot(((Integer)vals[1]).intValue());
}
}
caret.setVisible(((Boolean)vals[2]).booleanValue());
}
} else {
if (dropLocation == null) {
boolean visible;
if (caret instanceof DefaultCaret) {
DefaultCaret dc = (DefaultCaret)caret;
visible = dc.isActive();
retVal = new Object[] {Integer.valueOf(dc.getMark()),
Integer.valueOf(dc.getDot()),
Boolean.valueOf(visible),
dc.getMarkBias(),
dc.getDotBias()};
} else {
visible = caret.isVisible();
retVal = new Object[] {Integer.valueOf(caret.getMark()),
Integer.valueOf(caret.getDot()),
Boolean.valueOf(visible)};
}
caret.setVisible(true);
} else {
retVal = state;
}
if (caret instanceof DefaultCaret) {
((DefaultCaret)caret).setDot(textLocation.getIndex(), textLocation.getBias());
} else {
caret.setDot(textLocation.getIndex());
}
}
} else {
if (textLocation == null) {
if (state != null) {
caret.setVisible(((Boolean)state).booleanValue());
}
} else {
if (dropLocation == null) {
boolean visible = caret instanceof DefaultCaret
? ((DefaultCaret)caret).isActive()
: caret.isVisible();
retVal = Boolean.valueOf(visible);
caret.setVisible(false);
} else {
retVal = state;
}
}
}
DropLocation old = dropLocation;
dropLocation = textLocation;
firePropertyChange("dropLocation", old, dropLocation);
return retVal;
}
/**
* 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
*/
public final DropLocation getDropLocation() {
return dropLocation;
}
/**
* Updates the <code>InputMap</code>s in response to a
* <code>Keymap</code> change.
* @param oldKm the old <code>Keymap</code>
* @param newKm the new <code>Keymap</code>
*/
void updateInputMap(Keymap oldKm, Keymap newKm) {
// Locate the current KeymapWrapper.
InputMap km = getInputMap(JComponent.WHEN_FOCUSED);
InputMap last = km;
while (km != null && !(km instanceof KeymapWrapper)) {
last = km;
km = km.getParent();
}
if (km != null) {
// Found it, tweak the InputMap that points to it, as well
// as anything it points to.
if (newKm == null) {
if (last != km) {
last.setParent(km.getParent());
}
else {
last.setParent(null);
}
}
else {
InputMap newKM = new KeymapWrapper(newKm);
last.setParent(newKM);
if (last != km) {
newKM.setParent(km.getParent());
}
}
}
else if (newKm != null) {
km = getInputMap(JComponent.WHEN_FOCUSED);
if (km != null) {
// Couldn't find it.
// Set the parent of WHEN_FOCUSED InputMap to be the new one.
InputMap newKM = new KeymapWrapper(newKm);
newKM.setParent(km.getParent());
km.setParent(newKM);
}
}
// Do the same thing with the ActionMap
ActionMap am = getActionMap();
ActionMap lastAM = am;
while (am != null && !(am instanceof KeymapActionMap)) {
lastAM = am;
am = am.getParent();
}
if (am != null) {
// Found it, tweak the Actionap that points to it, as well
// as anything it points to.
if (newKm == null) {
if (lastAM != am) {
lastAM.setParent(am.getParent());
}
else {
lastAM.setParent(null);
}
}
else {
ActionMap newAM = new KeymapActionMap(newKm);
lastAM.setParent(newAM);
if (lastAM != am) {
newAM.setParent(am.getParent());
}
}
}
else if (newKm != null) {
am = getActionMap();
if (am != null) {
// Couldn't find it.
// Set the parent of ActionMap to be the new one.
ActionMap newAM = new KeymapActionMap(newKm);
newAM.setParent(am.getParent());
am.setParent(newAM);
}
}
}
/**
* Fetches the keymap currently active in this text
* component.
*
* @return the keymap
*/
public Keymap getKeymap() {
return keymap;
}
/**
* Adds a new keymap into the keymap hierarchy. Keymap bindings
* resolve from bottom up so an attribute specified in a child
* will override an attribute specified in the parent.
*
* @param nm the name of the keymap (must be unique within the
* collection of named keymaps in the document); the name may
* be <code>null</code> if the keymap is unnamed,
* but the caller is responsible for managing the reference
* returned as an unnamed keymap can't
* be fetched by name
* @param parent the parent keymap; this may be <code>null</code> if
* unspecified bindings need not be resolved in some other keymap
* @return the keymap
*/
public static Keymap addKeymap(String nm, Keymap parent) {
Keymap map = new DefaultKeymap(nm, parent);
if (nm != null) {
// add a named keymap, a class of bindings
getKeymapTable().put(nm, map);
}
return map;
}
/**
* Removes a named keymap previously added to the document. Keymaps
* with <code>null</code> names may not be removed in this way.
*
* @param nm the name of the keymap to remove
* @return the keymap that was removed
*/
public static Keymap removeKeymap(String nm) {
return getKeymapTable().remove(nm);
}
/**
* Fetches a named keymap previously added to the document.
* This does not work with <code>null</code>-named keymaps.
*
* @param nm the name of the keymap
* @return the keymap
*/
public static Keymap getKeymap(String nm) {
return getKeymapTable().get(nm);
}
private static HashMap<String,Keymap> getKeymapTable() {
synchronized (KEYMAP_TABLE) {
AppContext appContext = AppContext.getAppContext();
HashMap<String,Keymap> keymapTable =
(HashMap<String,Keymap>)appContext.get(KEYMAP_TABLE);
if (keymapTable == null) {
keymapTable = new HashMap<String,Keymap>(17);
appContext.put(KEYMAP_TABLE, keymapTable);
//initialize default keymap
Keymap binding = addKeymap(DEFAULT_KEYMAP, null);
binding.setDefaultAction(new
DefaultEditorKit.DefaultKeyTypedAction());
}
return keymapTable;
}
}
/**
* Binding record for creating key bindings.
* <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}.
*/
public static class KeyBinding {
/**
* The key.
*/
public KeyStroke key;
/**
* The name of the action for the key.
*/
public String actionName;
/**
* Creates a new key binding.
*
* @param key the key
* @param actionName the name of the action for the key
*/
public KeyBinding(KeyStroke key, String actionName) {
this.key = key;
this.actionName = actionName;
}
}
/**
* <p>
* Loads a keymap with a bunch of
* bindings. This can be used to take a static table of
* definitions and load them into some keymap. The following
* example illustrates an example of binding some keys to
* the cut, copy, and paste actions associated with a
* JTextComponent. A code fragment to accomplish
* this might look as follows:
* <pre><code>
*
* static final JTextComponent.KeyBinding[] defaultBindings = {
* new JTextComponent.KeyBinding(
* KeyStroke.getKeyStroke(KeyEvent.VK_C, InputEvent.CTRL_MASK),
* DefaultEditorKit.copyAction),
* new JTextComponent.KeyBinding(
* KeyStroke.getKeyStroke(KeyEvent.VK_V, InputEvent.CTRL_MASK),
* DefaultEditorKit.pasteAction),
* new JTextComponent.KeyBinding(
* KeyStroke.getKeyStroke(KeyEvent.VK_X, InputEvent.CTRL_MASK),
* DefaultEditorKit.cutAction),
* };
*
* JTextComponent c = new JTextPane();
* Keymap k = c.getKeymap();
* JTextComponent.loadKeymap(k, defaultBindings, c.getActions());
*
* </code></pre>
* The sets of bindings and actions may be empty but must be
* non-<code>null</code>.
*
* @param map the keymap
* @param bindings the bindings
* @param actions the set of actions
*/
public static void loadKeymap(Keymap map, KeyBinding[] bindings, Action[] actions) {
Hashtable<String, Action> h = new Hashtable<String, Action>();
for (Action a : actions) {
String value = (String)a.getValue(Action.NAME);
h.put((value!=null ? value:""), a);
}
for (KeyBinding binding : bindings) {
Action a = h.get(binding.actionName);
if (a != null) {
map.addActionForKeyStroke(binding.key, a);
}
}
}
/**
* Fetches the current color used to render the
* caret.
*
* @return the color
*/
public Color getCaretColor() {
return caretColor;
}
/**
* Sets the current color used to render the caret.
* Setting to <code>null</code> effectively restores the default color.
* Setting the color results in a PropertyChange event ("caretColor")
* being fired.
*
* @param c the color
* @see #getCaretColor
* @beaninfo
* description: the color used to render the caret
* bound: true
* preferred: true
*/
public void setCaretColor(Color c) {
Color old = caretColor;
caretColor = c;
firePropertyChange("caretColor", old, caretColor);
}
/**
* Fetches the current color used to render the
* selection.
*
* @return the color
*/
public Color getSelectionColor() {
return selectionColor;
}
/**
* Sets the current color used to render the selection.
* Setting the color to <code>null</code> is the same as setting
* <code>Color.white</code>. Setting the color results in a
* PropertyChange event ("selectionColor").
*
* @param c the color
* @see #getSelectionColor
* @beaninfo
* description: color used to render selection background
* bound: true
* preferred: true
*/
public void setSelectionColor(Color c) {
Color old = selectionColor;
selectionColor = c;
firePropertyChange("selectionColor", old, selectionColor);
}
/**
* Fetches the current color used to render the
* selected text.
*
* @return the color
*/
public Color getSelectedTextColor() {
return selectedTextColor;
}
/**
* Sets the current color used to render the selected text.
* Setting the color to <code>null</code> is the same as
* <code>Color.black</code>. Setting the color results in a
* PropertyChange event ("selectedTextColor") being fired.
*
* @param c the color
* @see #getSelectedTextColor
* @beaninfo
* description: color used to render selected text
* bound: true
* preferred: true
*/
public void setSelectedTextColor(Color c) {
Color old = selectedTextColor;
selectedTextColor = c;
firePropertyChange("selectedTextColor", old, selectedTextColor);
}
/**
* Fetches the current color used to render the
* disabled text.
*
* @return the color
*/
public Color getDisabledTextColor() {
return disabledTextColor;
}
/**
* Sets the current color used to render the
* disabled text. Setting the color fires off a
* PropertyChange event ("disabledTextColor").
*
* @param c the color
* @see #getDisabledTextColor
* @beaninfo
* description: color used to render disabled text
* bound: true
* preferred: true
*/
public void setDisabledTextColor(Color c) {
Color old = disabledTextColor;
disabledTextColor = c;
firePropertyChange("disabledTextColor", old, disabledTextColor);
}
/**
* Replaces the currently selected content with new content
* represented by the given string. If there is no selection
* this amounts to an insert of the given text. If there
* is no replacement text this amounts to a removal of the
* current selection.
* <p>
* This is the method that is used by the default implementation
* of the action for inserting content that gets bound to the
* keymap actions.
*
* @param content the content to replace the selection with
*/
public void replaceSelection(String content) {
Document doc = getDocument();
if (doc != null) {
try {
boolean composedTextSaved = saveComposedText(caret.getDot());
int p0 = Math.min(caret.getDot(), caret.getMark());
int p1 = Math.max(caret.getDot(), caret.getMark());
if (doc instanceof AbstractDocument) {
((AbstractDocument)doc).replace(p0, p1 - p0, content,null);
}
else {
if (p0 != p1) {
doc.remove(p0, p1 - p0);
}
if (content != null && content.length() > 0) {
doc.insertString(p0, content, null);
}
}
if (composedTextSaved) {
restoreComposedText();
}
} catch (BadLocationException e) {
UIManager.getLookAndFeel().provideErrorFeedback(JTextComponent.this);
}
}
}
/**
* Fetches a portion of the text represented by the
* component. Returns an empty string if length is 0.
*
* @param offs the offset ≥ 0
* @param len the length ≥ 0
* @return the text
* @exception BadLocationException if the offset or length are invalid
*/
public String getText(int offs, int len) throws BadLocationException {
return getDocument().getText(offs, len);
}
/**
* Converts the given location in the model to a place in
* the view coordinate system.
* The component must have a positive size for
* this translation to be computed (i.e. layout cannot
* be computed until the component has been sized). The
* component does not have to be visible or painted.
*
* @param pos the position ≥ 0
* @return the coordinates as a rectangle, with (r.x, r.y) as the location
* in the coordinate system, or null if the component does
* not yet have a positive size.
* @exception BadLocationException if the given position does not
* represent a valid location in the associated document
* @see TextUI#modelToView
*/
public Rectangle modelToView(int pos) throws BadLocationException {
return getUI().modelToView(this, pos);
}
/**
* Converts the given place in the view coordinate system
* to the nearest representative location in the model.
* The component must have a positive size for
* this translation to be computed (i.e. layout cannot
* be computed until the component has been sized). The
* component does not have to be visible or painted.
*
* @param pt the location in the view to translate
* @return the offset ≥ 0 from the start of the document,
* or -1 if the component does not yet have a positive
* size.
* @see TextUI#viewToModel
*/
public int viewToModel(Point pt) {
return getUI().viewToModel(this, pt);
}
/**
* Transfers the currently selected range in the associated
* text model to the system clipboard, removing the contents
* from the model. The current selection is reset. Does nothing
* for <code>null</code> selections.
*
* @see java.awt.Toolkit#getSystemClipboard
* @see java.awt.datatransfer.Clipboard
*/
public void cut() {
if (isEditable() && isEnabled()) {
invokeAction("cut", TransferHandler.getCutAction());
}
}
/**
* Transfers the currently selected range in the associated
* text model to the system clipboard, leaving the contents
* in the text model. The current selection remains intact.
* Does nothing for <code>null</code> selections.
*
* @see java.awt.Toolkit#getSystemClipboard
* @see java.awt.datatransfer.Clipboard
*/
public void copy() {
invokeAction("copy", TransferHandler.getCopyAction());
}
/**
* Transfers the contents of the system clipboard into the
* associated text model. If there is a selection in the
* associated view, it is replaced with the contents of the
* clipboard. If there is no selection, the clipboard contents
* are inserted in front of the current insert position in
* the associated view. If the clipboard is empty, does nothing.
*
* @see #replaceSelection
* @see java.awt.Toolkit#getSystemClipboard
* @see java.awt.datatransfer.Clipboard
*/
public void paste() {
if (isEditable() && isEnabled()) {
invokeAction("paste", TransferHandler.getPasteAction());
}
}
/**
* This is a convenience method that is only useful for
* <code>cut</code>, <code>copy</code> and <code>paste</code>. If
* an <code>Action</code> with the name <code>name</code> does not
* exist in the <code>ActionMap</code>, this will attempt to install a
* <code>TransferHandler</code> and then use <code>altAction</code>.
*/
private void invokeAction(String name, Action altAction) {
ActionMap map = getActionMap();
Action action = null;
if (map != null) {
action = map.get(name);
}
if (action == null) {
installDefaultTransferHandlerIfNecessary();
action = altAction;
}
action.actionPerformed(new ActionEvent(this,
ActionEvent.ACTION_PERFORMED, (String)action.
getValue(Action.NAME),
EventQueue.getMostRecentEventTime(),
getCurrentEventModifiers()));
}
/**
* If the current <code>TransferHandler</code> is null, this will
* install a new one.
*/
private void installDefaultTransferHandlerIfNecessary() {
if (getTransferHandler() == null) {
if (defaultTransferHandler == null) {
defaultTransferHandler = new DefaultTransferHandler();
}
setTransferHandler(defaultTransferHandler);
}
}
/**
* Moves the caret to a new position, leaving behind a mark
* defined by the last time <code>setCaretPosition</code> was
* called. This forms a selection.
* If the document is <code>null</code>, does nothing. The position
* must be between 0 and the length of the component's text or else
* an exception is thrown.
*
* @param pos the position
* @exception IllegalArgumentException if the value supplied
* for <code>position</code> is less than zero or greater
* than the component's text length
* @see #setCaretPosition
*/
public void moveCaretPosition(int pos) {
Document doc = getDocument();
if (doc != null) {
if (pos > doc.getLength() || pos < 0) {
throw new IllegalArgumentException("bad position: " + pos);
}
caret.moveDot(pos);
}
}
/**
* The bound property name for the focus accelerator.
*/
public static final String FOCUS_ACCELERATOR_KEY = "focusAcceleratorKey";
/**
* Sets the key accelerator that will cause the receiving text
* component to get the focus. The accelerator will be the
* key combination of the platform-specific modifier key and
* the character given (converted to upper case). For example,
* the ALT key is used as a modifier on Windows and the CTRL+ALT
* combination is used on Mac. By default, there is no focus
* accelerator key. Any previous key accelerator setting will be
* superseded. A '\0' key setting will be registered, and has the
* effect of turning off the focus accelerator. When the new key
* is set, a PropertyChange event (FOCUS_ACCELERATOR_KEY) will be fired.
*
* @param aKey the key
* @see #getFocusAccelerator
* @beaninfo
* description: accelerator character used to grab focus
* bound: true
*/
public void setFocusAccelerator(char aKey) {
aKey = Character.toUpperCase(aKey);
char old = focusAccelerator;
focusAccelerator = aKey;
// Fix for 4341002: value of FOCUS_ACCELERATOR_KEY is wrong.
// So we fire both FOCUS_ACCELERATOR_KEY, for compatibility,
// and the correct event here.
firePropertyChange(FOCUS_ACCELERATOR_KEY, old, focusAccelerator);
firePropertyChange("focusAccelerator", old, focusAccelerator);
}
/**
* Returns the key accelerator that will cause the receiving
* text component to get the focus. Return '\0' if no focus
* accelerator has been set.
*
* @return the key
*/
public char getFocusAccelerator() {
return focusAccelerator;
}
/**
* Initializes from a stream. This creates a
* model of the type appropriate for the component
* and initializes the model from the stream.
* By default this will load the model as plain
* text. Previous contents of the model are discarded.
*
* @param in the stream to read from
* @param desc an object describing the stream; this
* might be a string, a File, a URL, etc. Some kinds
* of documents (such as html for example) might be
* able to make use of this information; if non-<code>null</code>,
* it is added as a property of the document
* @exception IOException as thrown by the stream being
* used to initialize
* @see EditorKit#createDefaultDocument
* @see #setDocument
* @see PlainDocument
*/
public void read(Reader in, Object desc) throws IOException {
EditorKit kit = getUI().getEditorKit(this);
Document doc = kit.createDefaultDocument();
if (desc != null) {
doc.putProperty(Document.StreamDescriptionProperty, desc);
}
try {
kit.read(in, doc, 0);
setDocument(doc);
} catch (BadLocationException e) {
throw new IOException(e.getMessage());
}
}
/**
* Stores the contents of the model into the given
* stream. By default this will store the model as plain
* text.
*
* @param out the output stream
* @exception IOException on any I/O error
*/
public void write(Writer out) throws IOException {
Document doc = getDocument();
try {
getUI().getEditorKit(this).write(out, doc, 0, doc.getLength());
} catch (BadLocationException e) {
throw new IOException(e.getMessage());
}
}
public void removeNotify() {
super.removeNotify();
if (getFocusedComponent() == this) {
AppContext.getAppContext().remove(FOCUSED_COMPONENT);
}
}
// --- java.awt.TextComponent methods ------------------------
/**
* Sets the position of the text insertion caret for the
* <code>TextComponent</code>. Note that the caret tracks change,
* so this may move if the underlying text of the component is changed.
* If the document is <code>null</code>, does nothing. The position
* must be between 0 and the length of the component's text or else
* an exception is thrown.
*
* @param position the position
* @exception IllegalArgumentException if the value supplied
* for <code>position</code> is less than zero or greater
* than the component's text length
* @beaninfo
* description: the caret position
*/
public void setCaretPosition(int position) {
Document doc = getDocument();
if (doc != null) {
if (position > doc.getLength() || position < 0) {
throw new IllegalArgumentException("bad position: " + position);
}
caret.setDot(position);
}
}
/**
* Returns the position of the text insertion caret for the
* text component.
*
* @return the position of the text insertion caret for the
* text component ≥ 0
*/
@Transient
public int getCaretPosition() {
return caret.getDot();
}
/**
* Sets the text of this <code>TextComponent</code>
* to the specified text. If the text is <code>null</code>
* or empty, has the effect of simply deleting the old text.
* When text has been inserted, the resulting caret location
* is determined by the implementation of the caret class.
*
* <p>
* Note that text is not a bound property, so no <code>PropertyChangeEvent
* </code> is fired when it changes. To listen for changes to the text,
* use <code>DocumentListener</code>.
*
* @param t the new text to be set
* @see #getText
* @see DefaultCaret
* @beaninfo
* description: the text of this component
*/
public void setText(String t) {
try {
Document doc = getDocument();
if (doc instanceof AbstractDocument) {
((AbstractDocument)doc).replace(0, doc.getLength(), t,null);
}
else {
doc.remove(0, doc.getLength());
doc.insertString(0, t, null);
}
} catch (BadLocationException e) {
UIManager.getLookAndFeel().provideErrorFeedback(JTextComponent.this);
}
}
/**
* Returns the text contained in this <code>TextComponent</code>.
* If the underlying document is <code>null</code>,
* will give a <code>NullPointerException</code>.
*
* Note that text is not a bound property, so no <code>PropertyChangeEvent
* </code> is fired when it changes. To listen for changes to the text,
* use <code>DocumentListener</code>.
*
* @return the text
* @exception NullPointerException if the document is <code>null</code>
* @see #setText
*/
public String getText() {
Document doc = getDocument();
String txt;
try {
txt = doc.getText(0, doc.getLength());
} catch (BadLocationException e) {
txt = null;
}
return txt;
}
/**
* Returns the selected text contained in this
* <code>TextComponent</code>. If the selection is
* <code>null</code> or the document empty, returns <code>null</code>.
*
* @return the text
* @exception IllegalArgumentException if the selection doesn't
* have a valid mapping into the document for some reason
* @see #setText
*/
public String getSelectedText() {
String txt = null;
int p0 = Math.min(caret.getDot(), caret.getMark());
int p1 = Math.max(caret.getDot(), caret.getMark());
if (p0 != p1) {
try {
Document doc = getDocument();
txt = doc.getText(p0, p1 - p0);
} catch (BadLocationException e) {
throw new IllegalArgumentException(e.getMessage());
}
}
return txt;
}
/**
* Returns the boolean indicating whether this
* <code>TextComponent</code> is editable or not.
*
* @return the boolean value
* @see #setEditable
*/
public boolean isEditable() {
return editable;
}
/**
* Sets the specified boolean to indicate whether or not this
* <code>TextComponent</code> should be editable.
* A PropertyChange event ("editable") is fired when the
* state is changed.
*
* @param b the boolean to be set
* @see #isEditable
* @beaninfo
* description: specifies if the text can be edited
* bound: true
*/
public void setEditable(boolean b) {
if (b != editable) {
boolean oldVal = editable;
editable = b;
enableInputMethods(editable);
firePropertyChange("editable", Boolean.valueOf(oldVal), Boolean.valueOf(editable));
repaint();
}
}
/**
* Returns the selected text's start position. Return 0 for an
* empty document, or the value of dot if no selection.
*
* @return the start position ≥ 0
*/
@Transient
public int getSelectionStart() {
int start = Math.min(caret.getDot(), caret.getMark());
return start;
}
/**
* Sets the selection start to the specified position. The new
* starting point is constrained to be before or at the current
* selection end.
* <p>
* This is available for backward compatibility to code
* that called this method on <code>java.awt.TextComponent</code>.
* This is implemented to forward to the <code>Caret</code>
* implementation which is where the actual selection is maintained.
*
* @param selectionStart the start position of the text ≥ 0
* @beaninfo
* description: starting location of the selection.
*/
public void setSelectionStart(int selectionStart) {
/* Route through select method to enforce consistent policy
* between selectionStart and selectionEnd.
*/
select(selectionStart, getSelectionEnd());
}
/**
* Returns the selected text's end position. Return 0 if the document
* is empty, or the value of dot if there is no selection.
*
* @return the end position ≥ 0
*/
@Transient
public int getSelectionEnd() {
int end = Math.max(caret.getDot(), caret.getMark());
return end;
}
/**
* Sets the selection end to the specified position. The new
* end point is constrained to be at or after the current
* selection start.
* <p>
* This is available for backward compatibility to code
* that called this method on <code>java.awt.TextComponent</code>.
* This is implemented to forward to the <code>Caret</code>
* implementation which is where the actual selection is maintained.
*
* @param selectionEnd the end position of the text ≥ 0
* @beaninfo
* description: ending location of the selection.
*/
public void setSelectionEnd(int selectionEnd) {
/* Route through select method to enforce consistent policy
* between selectionStart and selectionEnd.
*/
select(getSelectionStart(), selectionEnd);
}
/**
* Selects the text between the specified start and end positions.
* <p>
* This method sets the start and end positions of the
* selected text, enforcing the restriction that the start position
* must be greater than or equal to zero. The end position must be
* greater than or equal to the start position, and less than or
* equal to the length of the text component's text.
* <p>
* If the caller supplies values that are inconsistent or out of
* bounds, the method enforces these constraints silently, and
* without failure. Specifically, if the start position or end
* position is greater than the length of the text, it is reset to
* equal the text length. If the start position is less than zero,
* it is reset to zero, and if the end position is less than the
* start position, it is reset to the start position.
* <p>
* This call is provided for backward compatibility.
* It is routed to a call to <code>setCaretPosition</code>
* followed by a call to <code>moveCaretPosition</code>.
* The preferred way to manage selection is by calling
* those methods directly.
*
* @param selectionStart the start position of the text
* @param selectionEnd the end position of the text
* @see #setCaretPosition
* @see #moveCaretPosition
*/
public void select(int selectionStart, int selectionEnd) {
// argument adjustment done by java.awt.TextComponent
int docLength = getDocument().getLength();
if (selectionStart < 0) {
selectionStart = 0;
}
if (selectionStart > docLength) {
selectionStart = docLength;
}
if (selectionEnd > docLength) {
selectionEnd = docLength;
}
if (selectionEnd < selectionStart) {
selectionEnd = selectionStart;
}
setCaretPosition(selectionStart);
moveCaretPosition(selectionEnd);
}
/**
* Selects all the text in the <code>TextComponent</code>.
* Does nothing on a <code>null</code> or empty document.
*/
public void selectAll() {
Document doc = getDocument();
if (doc != null) {
setCaretPosition(0);
moveCaretPosition(doc.getLength());
}
}
// --- Tooltip Methods ---------------------------------------------
/**
* Returns the string to be used as the tooltip for <code>event</code>.
* This will return one of:
* <ol>
* <li>If <code>setToolTipText</code> has been invoked with a
* non-<code>null</code>
* value, it will be returned, otherwise
* <li>The value from invoking <code>getToolTipText</code> on
* the UI will be returned.
* </ol>
* By default <code>JTextComponent</code> does not register
* itself with the <code>ToolTipManager</code>.
* This means that tooltips will NOT be shown from the
* <code>TextUI</code> unless <code>registerComponent</code> has
* been invoked on the <code>ToolTipManager</code>.
*
* @param event the event in question
* @return the string to be used as the tooltip for <code>event</code>
* @see javax.swing.JComponent#setToolTipText
* @see javax.swing.plaf.TextUI#getToolTipText
* @see javax.swing.ToolTipManager#registerComponent
*/
public String getToolTipText(MouseEvent event) {
String retValue = super.getToolTipText(event);
if (retValue == null) {
TextUI ui = getUI();
if (ui != null) {
retValue = ui.getToolTipText(this, new Point(event.getX(),
event.getY()));
}
}
return retValue;
}
// --- Scrollable methods ---------------------------------------------
/**
* Returns the preferred size of the viewport for a view component.
* This is implemented to do the default behavior of returning
* the preferred size of the component.
*
* @return the <code>preferredSize</code> of a <code>JViewport</code>
* whose view is this <code>Scrollable</code>
*/
public Dimension getPreferredScrollableViewportSize() {
return getPreferredSize();
}
/**
* Components that display logical rows or columns should compute
* the scroll increment that will completely expose one new row
* or column, depending on the value of orientation. Ideally,
* components should handle a partially exposed row or column by
* returning the distance required to completely expose the item.
* <p>
* The default implementation of this is to simply return 10% of
* the visible area. Subclasses are likely to be able to provide
* a much more reasonable value.
*
* @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
* @exception IllegalArgumentException for an invalid orientation
* @see JScrollBar#setUnitIncrement
*/
public int getScrollableUnitIncrement(Rectangle visibleRect, int orientation, int direction) {
switch(orientation) {
case SwingConstants.VERTICAL:
return visibleRect.height / 10;
case SwingConstants.HORIZONTAL:
return visibleRect.width / 10;
default:
throw new IllegalArgumentException("Invalid orientation: " + orientation);
}
}
/**
* Components that display logical rows or columns should compute
* the scroll increment that will completely expose one block
* of rows or columns, depending on the value of orientation.
* <p>
* The default implementation of this is to simply return the visible
* area. Subclasses will likely be able to provide a much more
* reasonable value.
*
* @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
* @exception IllegalArgumentException for an invalid orientation
* @see JScrollBar#setBlockIncrement
*/
public int getScrollableBlockIncrement(Rectangle visibleRect, int orientation, int direction) {
switch(orientation) {
case SwingConstants.VERTICAL:
return visibleRect.height;
case SwingConstants.HORIZONTAL:
return visibleRect.width;
default:
throw new IllegalArgumentException("Invalid orientation: " + orientation);
}
}
/**
* Returns true if a viewport should always force the width of this
* <code>Scrollable</code> to match the width of the viewport.
* For example a normal text view that supported line wrapping
* would return true here, since it would be undesirable for
* wrapped lines to disappear beyond the right
* edge of the viewport. Note that returning true for a
* <code>Scrollable</code> whose ancestor is a <code>JScrollPane</code>
* effectively disables horizontal scrolling.
* <p>
* Scrolling containers, like <code>JViewport</code>,
* will use this method each time they are validated.
*
* @return true if a viewport should force the <code>Scrollable</code>s
* width to match its own
*/
public boolean getScrollableTracksViewportWidth() {
Container parent = SwingUtilities.getUnwrappedParent(this);
if (parent instanceof JViewport) {
return parent.getWidth() > getPreferredSize().width;
}
return false;
}
/**
* Returns true if a viewport should always force the height of this
* <code>Scrollable</code> to match the height of the viewport.
* For example a columnar text view that flowed text in left to
* right columns could effectively disable vertical scrolling by
* returning true here.
* <p>
* Scrolling containers, like <code>JViewport</code>,
* will use this method each time they are validated.
*
* @return true if a viewport should force the Scrollables height
* to match its own
*/
public boolean getScrollableTracksViewportHeight() {
Container parent = SwingUtilities.getUnwrappedParent(this);
if (parent instanceof JViewport) {
return parent.getHeight() > getPreferredSize().height;
}
return false;
}
//////////////////
// Printing Support
//////////////////
/**
* A convenience print method that displays a print dialog, and then
* prints this {@code JTextComponent} in <i>interactive</i> mode with no
* header or footer text. Note: this method
* blocks until printing is done.
* <p>
* Note: In <i>headless</i> mode, no dialogs will be shown.
*
* <p> This method calls the full featured
* {@link #print(MessageFormat, MessageFormat, boolean, PrintService, PrintRequestAttributeSet, boolean)
* print} method to perform printing.
* @return {@code true}, unless printing is canceled by the user
* @throws PrinterException if an error in the print system causes the job
* to be aborted
* @throws SecurityException if this thread is not allowed to
* initiate a print job request
*
* @see #print(MessageFormat, MessageFormat, boolean, PrintService, PrintRequestAttributeSet, boolean)
*
* @since 1.6
*/
public boolean print() throws PrinterException {
return print(null, null, true, null, null, true);
}
/**
* A convenience print method that displays a print dialog, and then
* prints this {@code JTextComponent} in <i>interactive</i> mode with
* the specified header and footer text. Note: this method
* blocks until printing is done.
* <p>
* Note: In <i>headless</i> mode, no dialogs will be shown.
*
* <p> This method calls the full featured
* {@link #print(MessageFormat, MessageFormat, boolean, PrintService, PrintRequestAttributeSet, boolean)
* print} method to perform printing.
* @param headerFormat the text, in {@code MessageFormat}, to be
* used as the header, or {@code null} for no header
* @param footerFormat the text, in {@code MessageFormat}, to be
* used as the footer, or {@code null} for no footer
* @return {@code true}, unless printing is canceled by the user
* @throws PrinterException if an error in the print system causes the job
* to be aborted
* @throws SecurityException if this thread is not allowed to
* initiate a print job request
*
* @see #print(MessageFormat, MessageFormat, boolean, PrintService, PrintRequestAttributeSet, boolean)
* @see java.text.MessageFormat
* @since 1.6
*/
public boolean print(final MessageFormat headerFormat,
final MessageFormat footerFormat) throws PrinterException {
return print(headerFormat, footerFormat, true, null, null, true);
}
/**
* Prints the content of this {@code JTextComponent}. Note: this method
* blocks until printing is done.
*
* <p>
* Page header and footer text can be added to the output by providing
* {@code MessageFormat} arguments. The printing code requests
* {@code Strings} from the formats, providing a single item which may be
* included in the formatted string: an {@code Integer} representing the
* current page number.
*
* <p>
* {@code showPrintDialog boolean} parameter allows you to specify whether
* a print dialog is displayed to the user. When it is, the user
* may use the dialog to change printing attributes or even cancel the
* print.
*
* <p>
* {@code service} allows you to provide the initial
* {@code PrintService} for the print dialog, or to specify
* {@code PrintService} to print to when the dialog is not shown.
*
* <p>
* {@code attributes} can be used to provide the
* initial values for the print dialog, or to supply any needed
* attributes when the dialog is not shown. {@code attributes} can
* be used to control how the job will print, for example
* <i>duplex</i> or <i>single-sided</i>.
*
* <p>
* {@code interactive boolean} parameter allows you to specify
* whether to perform printing in <i>interactive</i>
* mode. If {@code true}, a progress dialog, with an abort option,
* is displayed for the duration of printing. This dialog is
* <i>modal</i> when {@code print} is invoked on the <i>Event Dispatch
* Thread</i> and <i>non-modal</i> otherwise. <b>Warning</b>:
* calling this method on the <i>Event Dispatch Thread</i> with {@code
* interactive false} blocks <i>all</i> events, including repaints, from
* being processed until printing is complete. It is only
* recommended when printing from an application with no
* visible GUI.
*
* <p>
* Note: In <i>headless</i> mode, {@code showPrintDialog} and
* {@code interactive} parameters are ignored and no dialogs are
* shown.
*
* <p>
* This method ensures the {@code document} is not mutated during printing.
* To indicate it visually, {@code setEnabled(false)} is set for the
* duration of printing.
*
* <p>
* This method uses {@link #getPrintable} to render document content.
*
* <p>
* This method is thread-safe, although most Swing methods are not. Please
* see <A
* HREF="https://docs.oracle.com/javase/tutorial/uiswing/concurrency/index.html">
* Concurrency in Swing</A> for more information.
*
* <p>
* <b>Sample Usage</b>. This code snippet shows a cross-platform print
* dialog and then prints the {@code JTextComponent} in <i>interactive</i> mode
* unless the user cancels the dialog:
*
* <pre>
* textComponent.print(new MessageFormat("My text component header"),
* new MessageFormat("Footer. Page - {0}"), true, null, null, true);
* </pre>
* <p>
* Executing this code off the <i>Event Dispatch Thread</i>
* performs printing on the <i>background</i>.
* The following pattern might be used for <i>background</i>
* printing:
* <pre>
* FutureTask<Boolean> future =
* new FutureTask<Boolean>(
* new Callable<Boolean>() {
* public Boolean call() {
* return textComponent.print(.....);
* }
* });
* executor.execute(future);
* </pre>
*
* @param headerFormat the text, in {@code MessageFormat}, to be
* used as the header, or {@code null} for no header
* @param footerFormat the text, in {@code MessageFormat}, to be
* used as the footer, or {@code null} for no footer
* @param showPrintDialog {@code true} to display a print dialog,
* {@code false} otherwise
* @param service initial {@code PrintService}, or {@code null} for the
* default
* @param attributes the job attributes to be applied to the print job, or
* {@code null} for none
* @param interactive whether to print in an interactive mode
* @return {@code true}, unless printing is canceled by the user
* @throws PrinterException if an error in the print system causes the job
* to be aborted
* @throws SecurityException if this thread is not allowed to
* initiate a print job request
*
* @see #getPrintable
* @see java.text.MessageFormat
* @see java.awt.GraphicsEnvironment#isHeadless
* @see java.util.concurrent.FutureTask
*
* @since 1.6
*/
public boolean print(final MessageFormat headerFormat,
final MessageFormat footerFormat,
final boolean showPrintDialog,
final PrintService service,
final PrintRequestAttributeSet attributes,
final boolean interactive)
throws PrinterException {
final PrinterJob job = PrinterJob.getPrinterJob();
final Printable printable;
final PrintingStatus printingStatus;
final boolean isHeadless = GraphicsEnvironment.isHeadless();
final boolean isEventDispatchThread =
SwingUtilities.isEventDispatchThread();
final Printable textPrintable = getPrintable(headerFormat, footerFormat);
if (interactive && ! isHeadless) {
printingStatus =
PrintingStatus.createPrintingStatus(this, job);
printable =
printingStatus.createNotificationPrintable(textPrintable);
} else {
printingStatus = null;
printable = textPrintable;
}
if (service != null) {
job.setPrintService(service);
}
job.setPrintable(printable);
final PrintRequestAttributeSet attr = (attributes == null)
? new HashPrintRequestAttributeSet()
: attributes;
if (showPrintDialog && ! isHeadless && ! job.printDialog(attr)) {
return false;
}
/*
* there are three cases for printing:
* 1. print non interactively (! interactive || isHeadless)
* 2. print interactively off EDT
* 3. print interactively on EDT
*
* 1 and 2 prints on the current thread (3 prints on another thread)
* 2 and 3 deal with PrintingStatusDialog
*/
final Callable<Object> doPrint =
new Callable<Object>() {
public Object call() throws Exception {
try {
job.print(attr);
} finally {
if (printingStatus != null) {
printingStatus.dispose();
}
}
return null;
}
};
final FutureTask<Object> futurePrinting =
new FutureTask<Object>(doPrint);
final Runnable runnablePrinting =
new Runnable() {
public void run() {
//disable component
boolean wasEnabled = false;
if (isEventDispatchThread) {
if (isEnabled()) {
wasEnabled = true;
setEnabled(false);
}
} else {
try {
wasEnabled = SwingUtilities2.submit(
new Callable<Boolean>() {
public Boolean call() throws Exception {
boolean rv = isEnabled();
if (rv) {
setEnabled(false);
}
return rv;
}
}).get();
} catch (InterruptedException e) {
throw new RuntimeException(e);
} catch (ExecutionException e) {
Throwable cause = e.getCause();
if (cause instanceof Error) {
throw (Error) cause;
}
if (cause instanceof RuntimeException) {
throw (RuntimeException) cause;
}
throw new AssertionError(cause);
}
}
getDocument().render(futurePrinting);
//enable component
if (wasEnabled) {
if (isEventDispatchThread) {
setEnabled(true);
} else {
try {
SwingUtilities2.submit(
new Runnable() {
public void run() {
setEnabled(true);
}
}, null).get();
} catch (InterruptedException e) {
throw new RuntimeException(e);
} catch (ExecutionException e) {
Throwable cause = e.getCause();
if (cause instanceof Error) {
throw (Error) cause;
}
if (cause instanceof RuntimeException) {
throw (RuntimeException) cause;
}
throw new AssertionError(cause);
}
}
}
}
};
if (! interactive || isHeadless) {
runnablePrinting.run();
} else {
if (isEventDispatchThread) {
(new Thread(runnablePrinting)).start();
printingStatus.showModal(true);
} else {
printingStatus.showModal(false);
runnablePrinting.run();
}
}
//the printing is done successfully or otherwise.
//dialog is hidden if needed.
try {
futurePrinting.get();
} catch (InterruptedException e) {
throw new RuntimeException(e);
} catch (ExecutionException e) {
Throwable cause = e.getCause();
if (cause instanceof PrinterAbortException) {
if (printingStatus != null
&& printingStatus.isAborted()) {
return false;
} else {
throw (PrinterAbortException) cause;
}
} else if (cause instanceof PrinterException) {
throw (PrinterException) cause;
} else if (cause instanceof RuntimeException) {
throw (RuntimeException) cause;
} else if (cause instanceof Error) {
throw (Error) cause;
} else {
throw new AssertionError(cause);
}
}
return true;
}
/**
* Returns a {@code Printable} to use for printing the content of this
* {@code JTextComponent}. The returned {@code Printable} prints
* the document as it looks on the screen except being reformatted
* to fit the paper.
* The returned {@code Printable} can be wrapped inside another
* {@code Printable} in order to create complex reports and
* documents.
*
*
* <p>
* The returned {@code Printable} shares the {@code document} with this
* {@code JTextComponent}. It is the responsibility of the developer to
* ensure that the {@code document} is not mutated while this {@code Printable}
* is used. Printing behavior is undefined when the {@code document} is
* mutated during printing.
*
* <p>
* Page header and footer text can be added to the output by providing
* {@code MessageFormat} arguments. The printing code requests
* {@code Strings} from the formats, providing a single item which may be
* included in the formatted string: an {@code Integer} representing the
* current page number.
*
* <p>
* The returned {@code Printable} when printed, formats the
* document content appropriately for the page size. For correct
* line wrapping the {@code imageable width} of all pages must be the
* same. See {@link java.awt.print.PageFormat#getImageableWidth}.
*
* <p>
* This method is thread-safe, although most Swing methods are not. Please
* see <A
* HREF="https://docs.oracle.com/javase/tutorial/uiswing/concurrency/index.html">
* Concurrency in Swing</A> for more information.
*
* <p>
* The returned {@code Printable} can be printed on any thread.
*
* <p>
* This implementation returned {@code Printable} performs all painting on
* the <i>Event Dispatch Thread</i>, regardless of what thread it is
* used on.
*
* @param headerFormat the text, in {@code MessageFormat}, to be
* used as the header, or {@code null} for no header
* @param footerFormat the text, in {@code MessageFormat}, to be
* used as the footer, or {@code null} for no footer
* @return a {@code Printable} for use in printing content of this
* {@code JTextComponent}
*
*
* @see java.awt.print.Printable
* @see java.awt.print.PageFormat
* @see javax.swing.text.Document#render(java.lang.Runnable)
*
* @since 1.6
*/
public Printable getPrintable(final MessageFormat headerFormat,
final MessageFormat footerFormat) {
return TextComponentPrintable.getPrintable(
this, headerFormat, footerFormat);
}
/////////////////
// Accessibility support
////////////////
/**
* Gets the <code>AccessibleContext</code> associated with this
* <code>JTextComponent</code>. For text components,
* the <code>AccessibleContext</code> takes the form of an
* <code>AccessibleJTextComponent</code>.
* A new <code>AccessibleJTextComponent</code> instance
* is created if necessary.
*
* @return an <code>AccessibleJTextComponent</code> that serves as the
* <code>AccessibleContext</code> of this
* <code>JTextComponent</code>
*/
public AccessibleContext getAccessibleContext() {
if (accessibleContext == null) {
accessibleContext = new AccessibleJTextComponent();
}
return accessibleContext;
}
/**
* This class implements accessibility support for the
* <code>JTextComponent</code> class. It provides an implementation of
* the Java Accessibility API appropriate to menu 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}.
*/
public class AccessibleJTextComponent extends AccessibleJComponent
implements AccessibleText, CaretListener, DocumentListener,
AccessibleAction, AccessibleEditableText,
AccessibleExtendedText {
int caretPos;
Point oldLocationOnScreen;
/**
* Constructs an AccessibleJTextComponent. Adds a listener to track
* caret change.
*/
public AccessibleJTextComponent() {
Document doc = JTextComponent.this.getDocument();
if (doc != null) {
doc.addDocumentListener(this);
}
JTextComponent.this.addCaretListener(this);
caretPos = getCaretPosition();
try {
oldLocationOnScreen = getLocationOnScreen();
} catch (IllegalComponentStateException iae) {
}
// Fire a ACCESSIBLE_VISIBLE_DATA_PROPERTY PropertyChangeEvent
// when the text component moves (e.g., when scrolling).
// Using an anonymous class since making AccessibleJTextComponent
// implement ComponentListener would be an API change.
JTextComponent.this.addComponentListener(new ComponentAdapter() {
public void componentMoved(ComponentEvent e) {
try {
Point newLocationOnScreen = getLocationOnScreen();
firePropertyChange(ACCESSIBLE_VISIBLE_DATA_PROPERTY,
oldLocationOnScreen,
newLocationOnScreen);
oldLocationOnScreen = newLocationOnScreen;
} catch (IllegalComponentStateException iae) {
}
}
});
}
/**
* Handles caret updates (fire appropriate property change event,
* which are AccessibleContext.ACCESSIBLE_CARET_PROPERTY and
* AccessibleContext.ACCESSIBLE_SELECTION_PROPERTY).
* This keeps track of the dot position internally. When the caret
* moves, the internal position is updated after firing the event.
*
* @param e the CaretEvent
*/
public void caretUpdate(CaretEvent e) {
int dot = e.getDot();
int mark = e.getMark();
if (caretPos != dot) {
// the caret moved
firePropertyChange(ACCESSIBLE_CARET_PROPERTY,
new Integer(caretPos), new Integer(dot));
caretPos = dot;
try {
oldLocationOnScreen = getLocationOnScreen();
} catch (IllegalComponentStateException iae) {
}
}
if (mark != dot) {
// there is a selection
firePropertyChange(ACCESSIBLE_SELECTION_PROPERTY, null,
getSelectedText());
}
}
// DocumentListener methods
/**
* Handles document insert (fire appropriate property change event
* which is AccessibleContext.ACCESSIBLE_TEXT_PROPERTY).
* This tracks the changed offset via the event.
*
* @param e the DocumentEvent
*/
public void insertUpdate(DocumentEvent e) {
final Integer pos = new Integer (e.getOffset());
if (SwingUtilities.isEventDispatchThread()) {
firePropertyChange(ACCESSIBLE_TEXT_PROPERTY, null, pos);
} else {
Runnable doFire = new Runnable() {
public void run() {
firePropertyChange(ACCESSIBLE_TEXT_PROPERTY,
null, pos);
}
};
SwingUtilities.invokeLater(doFire);
}
}
/**
* Handles document remove (fire appropriate property change event,
* which is AccessibleContext.ACCESSIBLE_TEXT_PROPERTY).
* This tracks the changed offset via the event.
*
* @param e the DocumentEvent
*/
public void removeUpdate(DocumentEvent e) {
final Integer pos = new Integer (e.getOffset());
if (SwingUtilities.isEventDispatchThread()) {
firePropertyChange(ACCESSIBLE_TEXT_PROPERTY, null, pos);
} else {
Runnable doFire = new Runnable() {
public void run() {
firePropertyChange(ACCESSIBLE_TEXT_PROPERTY,
null, pos);
}
};
SwingUtilities.invokeLater(doFire);
}
}
/**
* Handles document remove (fire appropriate property change event,
* which is AccessibleContext.ACCESSIBLE_TEXT_PROPERTY).
* This tracks the changed offset via the event.
*
* @param e the DocumentEvent
*/
public void changedUpdate(DocumentEvent e) {
final Integer pos = new Integer (e.getOffset());
if (SwingUtilities.isEventDispatchThread()) {
firePropertyChange(ACCESSIBLE_TEXT_PROPERTY, null, pos);
} else {
Runnable doFire = new Runnable() {
public void run() {
firePropertyChange(ACCESSIBLE_TEXT_PROPERTY,
null, pos);
}
};
SwingUtilities.invokeLater(doFire);
}
}
/**
* Gets the state set of the JTextComponent.
* The AccessibleStateSet of an object is composed of a set of
* unique AccessibleState's. A change in the AccessibleStateSet
* of an object will cause a PropertyChangeEvent to be fired
* for the AccessibleContext.ACCESSIBLE_STATE_PROPERTY property.
*
* @return an instance of AccessibleStateSet containing the
* current state set of the object
* @see AccessibleStateSet
* @see AccessibleState
* @see #addPropertyChangeListener
*/
public AccessibleStateSet getAccessibleStateSet() {
AccessibleStateSet states = super.getAccessibleStateSet();
if (JTextComponent.this.isEditable()) {
states.add(AccessibleState.EDITABLE);
}
return states;
}
/**
* Gets the role of this object.
*
* @return an instance of AccessibleRole describing the role of the
* object (AccessibleRole.TEXT)
* @see AccessibleRole
*/
public AccessibleRole getAccessibleRole() {
return AccessibleRole.TEXT;
}
/**
* Get the AccessibleText associated with this object. In the
* implementation of the Java Accessibility API for this class,
* return this object, which is responsible for implementing the
* AccessibleText interface on behalf of itself.
*
* @return this object
*/
public AccessibleText getAccessibleText() {
return this;
}
// --- interface AccessibleText methods ------------------------
/**
* Many of these methods are just convenience methods; they
* just call the equivalent on the parent
*/
/**
* Given a point in local coordinates, return the zero-based index
* of the character under that Point. If the point is invalid,
* this method returns -1.
*
* @param p the Point in local coordinates
* @return the zero-based index of the character under Point p.
*/
public int getIndexAtPoint(Point p) {
if (p == null) {
return -1;
}
return JTextComponent.this.viewToModel(p);
}
/**
* Gets the editor's drawing rectangle. Stolen
* from the unfortunately named
* BasicTextUI.getVisibleEditorRect()
*
* @return the bounding box for the root view
*/
Rectangle getRootEditorRect() {
Rectangle alloc = JTextComponent.this.getBounds();
if ((alloc.width > 0) && (alloc.height > 0)) {
alloc.x = alloc.y = 0;
Insets insets = JTextComponent.this.getInsets();
alloc.x += insets.left;
alloc.y += insets.top;
alloc.width -= insets.left + insets.right;
alloc.height -= insets.top + insets.bottom;
return alloc;
}
return null;
}
/**
* Determines the bounding box of the character at the given
* index into the string. The bounds are returned in local
* coordinates. If the index is invalid a null rectangle
* is returned.
*
* The screen coordinates returned are "unscrolled coordinates"
* if the JTextComponent is contained in a JScrollPane in which
* case the resulting rectangle should be composed with the parent
* coordinates. A good algorithm to use is:
* <pre>
* Accessible a:
* AccessibleText at = a.getAccessibleText();
* AccessibleComponent ac = a.getAccessibleComponent();
* Rectangle r = at.getCharacterBounds();
* Point p = ac.getLocation();
* r.x += p.x;
* r.y += p.y;
* </pre>
*
* Note: the JTextComponent must have a valid size (e.g. have
* been added to a parent container whose ancestor container
* is a valid top-level window) for this method to be able
* to return a meaningful (non-null) value.
*
* @param i the index into the String ≥ 0
* @return the screen coordinates of the character's bounding box
*/
public Rectangle getCharacterBounds(int i) {
if (i < 0 || i > model.getLength()-1) {
return null;
}
TextUI ui = getUI();
if (ui == null) {
return null;
}
Rectangle rect = null;
Rectangle alloc = getRootEditorRect();
if (alloc == null) {
return null;
}
if (model instanceof AbstractDocument) {
((AbstractDocument)model).readLock();
}
try {
View rootView = ui.getRootView(JTextComponent.this);
if (rootView != null) {
rootView.setSize(alloc.width, alloc.height);
Shape bounds = rootView.modelToView(i,
Position.Bias.Forward, i+1,
Position.Bias.Backward, alloc);
rect = (bounds instanceof Rectangle) ?
(Rectangle)bounds : bounds.getBounds();
}
} catch (BadLocationException e) {
} finally {
if (model instanceof AbstractDocument) {
((AbstractDocument)model).readUnlock();
}
}
return rect;
}
/**
* Returns the number of characters (valid indices)
*
* @return the number of characters ≥ 0
*/
public int getCharCount() {
return model.getLength();
}
/**
* Returns the zero-based offset of the caret.
*
* Note: The character to the right of the caret will have the
* same index value as the offset (the caret is between
* two characters).
*
* @return the zero-based offset of the caret.
*/
public int getCaretPosition() {
return JTextComponent.this.getCaretPosition();
}
/**
* Returns the AttributeSet for a given character (at a given index).
*
* @param i the zero-based index into the text
* @return the AttributeSet of the character
*/
public AttributeSet getCharacterAttribute(int i) {
Element e = null;
if (model instanceof AbstractDocument) {
((AbstractDocument)model).readLock();
}
try {
for (e = model.getDefaultRootElement(); ! e.isLeaf(); ) {
int index = e.getElementIndex(i);
e = e.getElement(index);
}
} finally {
if (model instanceof AbstractDocument) {
((AbstractDocument)model).readUnlock();
}
}
return e.getAttributes();
}
/**
* Returns the start offset within the selected text.
* If there is no selection, but there is
* a caret, the start and end offsets will be the same.
* Return 0 if the text is empty, or the caret position
* if no selection.
*
* @return the index into the text of the start of the selection ≥ 0
*/
public int getSelectionStart() {
return JTextComponent.this.getSelectionStart();
}
/**
* Returns the end offset within the selected text.
* If there is no selection, but there is
* a caret, the start and end offsets will be the same.
* Return 0 if the text is empty, or the caret position
* if no selection.
*
* @return the index into the text of the end of the selection ≥ 0
*/
public int getSelectionEnd() {
return JTextComponent.this.getSelectionEnd();
}
/**
* Returns the portion of the text that is selected.
*
* @return the text, null if no selection
*/
public String getSelectedText() {
return JTextComponent.this.getSelectedText();
}
/**
* IndexedSegment extends Segment adding the offset into the
* the model the <code>Segment</code> was asked for.
*/
private class IndexedSegment extends Segment {
/**
* Offset into the model that the position represents.
*/
public int modelOffset;
}
// TIGER - 4170173
/**
* Returns the String at a given index. Whitespace
* between words is treated as a word.
*
* @param part the CHARACTER, WORD, or SENTENCE to retrieve
* @param index an index within the text
* @return the letter, word, or sentence.
*
*/
public String getAtIndex(int part, int index) {
return getAtIndex(part, index, 0);
}
/**
* Returns the String after a given index. Whitespace
* between words is treated as a word.
*
* @param part the CHARACTER, WORD, or SENTENCE to retrieve
* @param index an index within the text
* @return the letter, word, or sentence.
*/
public String getAfterIndex(int part, int index) {
return getAtIndex(part, index, 1);
}
/**
* Returns the String before a given index. Whitespace
* between words is treated a word.
*
* @param part the CHARACTER, WORD, or SENTENCE to retrieve
* @param index an index within the text
* @return the letter, word, or sentence.
*/
public String getBeforeIndex(int part, int index) {
return getAtIndex(part, index, -1);
}
/**
* Gets the word, sentence, or character at <code>index</code>.
* If <code>direction</code> is non-null this will find the
* next/previous word/sentence/character.
*/
private String getAtIndex(int part, int index, int direction) {
if (model instanceof AbstractDocument) {
((AbstractDocument)model).readLock();
}
try {
if (index < 0 || index >= model.getLength()) {
return null;
}
switch (part) {
case AccessibleText.CHARACTER:
if (index + direction < model.getLength() &&
index + direction >= 0) {
return model.getText(index + direction, 1);
}
break;
case AccessibleText.WORD:
case AccessibleText.SENTENCE:
IndexedSegment seg = getSegmentAt(part, index);
if (seg != null) {
if (direction != 0) {
int next;
if (direction < 0) {
next = seg.modelOffset - 1;
}
else {
next = seg.modelOffset + direction * seg.count;
}
if (next >= 0 && next <= model.getLength()) {
seg = getSegmentAt(part, next);
}
else {
seg = null;
}
}
if (seg != null) {
return new String(seg.array, seg.offset,
seg.count);
}
}
break;
default:
break;
}
} catch (BadLocationException e) {
} finally {
if (model instanceof AbstractDocument) {
((AbstractDocument)model).readUnlock();
}
}
return null;
}
/*
* Returns the paragraph element for the specified index.
*/
private Element getParagraphElement(int index) {
if (model instanceof PlainDocument ) {
PlainDocument sdoc = (PlainDocument)model;
return sdoc.getParagraphElement(index);
} else if (model instanceof StyledDocument) {
StyledDocument sdoc = (StyledDocument)model;
return sdoc.getParagraphElement(index);
} else {
Element para;
for (para = model.getDefaultRootElement(); ! para.isLeaf(); ) {
int pos = para.getElementIndex(index);
para = para.getElement(pos);
}
if (para == null) {
return null;
}
return para.getParentElement();
}
}
/*
* Returns a <code>Segment</code> containing the paragraph text
* at <code>index</code>, or null if <code>index</code> isn't
* valid.
*/
private IndexedSegment getParagraphElementText(int index)
throws BadLocationException {
Element para = getParagraphElement(index);
if (para != null) {
IndexedSegment segment = new IndexedSegment();
try {
int length = para.getEndOffset() - para.getStartOffset();
model.getText(para.getStartOffset(), length, segment);
} catch (BadLocationException e) {
return null;
}
segment.modelOffset = para.getStartOffset();
return segment;
}
return null;
}
/**
* Returns the Segment at <code>index</code> representing either
* the paragraph or sentence as identified by <code>part</code>, or
* null if a valid paragraph/sentence can't be found. The offset
* will point to the start of the word/sentence in the array, and
* the modelOffset will point to the location of the word/sentence
* in the model.
*/
private IndexedSegment getSegmentAt(int part, int index) throws
BadLocationException {
IndexedSegment seg = getParagraphElementText(index);
if (seg == null) {
return null;
}
BreakIterator iterator;
switch (part) {
case AccessibleText.WORD:
iterator = BreakIterator.getWordInstance(getLocale());
break;
case AccessibleText.SENTENCE:
iterator = BreakIterator.getSentenceInstance(getLocale());
break;
default:
return null;
}
seg.first();
iterator.setText(seg);
int end = iterator.following(index - seg.modelOffset + seg.offset);
if (end == BreakIterator.DONE) {
return null;
}
if (end > seg.offset + seg.count) {
return null;
}
int begin = iterator.previous();
if (begin == BreakIterator.DONE ||
begin >= seg.offset + seg.count) {
return null;
}
seg.modelOffset = seg.modelOffset + begin - seg.offset;
seg.offset = begin;
seg.count = end - begin;
return seg;
}
// begin AccessibleEditableText methods -----
/**
* Returns the AccessibleEditableText interface for
* this text component.
*
* @return the AccessibleEditableText interface
* @since 1.4
*/
public AccessibleEditableText getAccessibleEditableText() {
return this;
}
/**
* Sets the text contents to the specified string.
*
* @param s the string to set the text contents
* @since 1.4
*/
public void setTextContents(String s) {
JTextComponent.this.setText(s);
}
/**
* Inserts the specified string at the given index
*
* @param index the index in the text where the string will
* be inserted
* @param s the string to insert in the text
* @since 1.4
*/
public void insertTextAtIndex(int index, String s) {
Document doc = JTextComponent.this.getDocument();
if (doc != null) {
try {
if (s != null && s.length() > 0) {
boolean composedTextSaved = saveComposedText(index);
doc.insertString(index, s, null);
if (composedTextSaved) {
restoreComposedText();
}
}
} catch (BadLocationException e) {
UIManager.getLookAndFeel().provideErrorFeedback(JTextComponent.this);
}
}
}
/**
* Returns the text string between two indices.
*
* @param startIndex the starting index in the text
* @param endIndex the ending index in the text
* @return the text string between the indices
* @since 1.4
*/
public String getTextRange(int startIndex, int endIndex) {
String txt = null;
int p0 = Math.min(startIndex, endIndex);
int p1 = Math.max(startIndex, endIndex);
if (p0 != p1) {
try {
Document doc = JTextComponent.this.getDocument();
txt = doc.getText(p0, p1 - p0);
} catch (BadLocationException e) {
throw new IllegalArgumentException(e.getMessage());
}
}
return txt;
}
/**
* Deletes the text between two indices
*
* @param startIndex the starting index in the text
* @param endIndex the ending index in the text
* @since 1.4
*/
public void delete(int startIndex, int endIndex) {
if (isEditable() && isEnabled()) {
try {
int p0 = Math.min(startIndex, endIndex);
int p1 = Math.max(startIndex, endIndex);
if (p0 != p1) {
Document doc = getDocument();
doc.remove(p0, p1 - p0);
}
} catch (BadLocationException e) {
}
} else {
UIManager.getLookAndFeel().provideErrorFeedback(JTextComponent.this);
}
}
/**
* Cuts the text between two indices into the system clipboard.
*
* @param startIndex the starting index in the text
* @param endIndex the ending index in the text
* @since 1.4
*/
public void cut(int startIndex, int endIndex) {
selectText(startIndex, endIndex);
JTextComponent.this.cut();
}
/**
* Pastes the text from the system clipboard into the text
* starting at the specified index.
*
* @param startIndex the starting index in the text
* @since 1.4
*/
public void paste(int startIndex) {
setCaretPosition(startIndex);
JTextComponent.this.paste();
}
/**
* Replaces the text between two indices with the specified
* string.
*
* @param startIndex the starting index in the text
* @param endIndex the ending index in the text
* @param s the string to replace the text between two indices
* @since 1.4
*/
public void replaceText(int startIndex, int endIndex, String s) {
selectText(startIndex, endIndex);
JTextComponent.this.replaceSelection(s);
}
/**
* Selects the text between two indices.
*
* @param startIndex the starting index in the text
* @param endIndex the ending index in the text
* @since 1.4
*/
public void selectText(int startIndex, int endIndex) {
JTextComponent.this.select(startIndex, endIndex);
}
/**
* Sets attributes for the text between two indices.
*
* @param startIndex the starting index in the text
* @param endIndex the ending index in the text
* @param as the attribute set
* @see AttributeSet
* @since 1.4
*/
public void setAttributes(int startIndex, int endIndex,
AttributeSet as) {
// Fixes bug 4487492
Document doc = JTextComponent.this.getDocument();
if (doc != null && doc instanceof StyledDocument) {
StyledDocument sDoc = (StyledDocument)doc;
int offset = startIndex;
int length = endIndex - startIndex;
sDoc.setCharacterAttributes(offset, length, as, true);
}
}
// ----- end AccessibleEditableText methods
// ----- begin AccessibleExtendedText methods
// Probably should replace the helper method getAtIndex() to return
// instead an AccessibleTextSequence also for LINE & ATTRIBUTE_RUN
// and then make the AccessibleText methods get[At|After|Before]Point
// call this new method instead and return only the string portion
/**
* Returns the AccessibleTextSequence at a given <code>index</code>.
* If <code>direction</code> is non-null this will find the
* next/previous word/sentence/character.
*
* @param part the <code>CHARACTER</code>, <code>WORD</code>,
* <code>SENTENCE</code>, <code>LINE</code> or
* <code>ATTRIBUTE_RUN</code> to retrieve
* @param index an index within the text
* @param direction is either -1, 0, or 1
* @return an <code>AccessibleTextSequence</code> specifying the text
* if <code>part</code> and <code>index</code> are valid. Otherwise,
* <code>null</code> is returned.
*
* @see javax.accessibility.AccessibleText#CHARACTER
* @see javax.accessibility.AccessibleText#WORD
* @see javax.accessibility.AccessibleText#SENTENCE
* @see javax.accessibility.AccessibleExtendedText#LINE
* @see javax.accessibility.AccessibleExtendedText#ATTRIBUTE_RUN
*
* @since 1.6
*/
private AccessibleTextSequence getSequenceAtIndex(int part,
int index, int direction) {
if (index < 0 || index >= model.getLength()) {
return null;
}
if (direction < -1 || direction > 1) {
return null; // direction must be 1, 0, or -1
}
switch (part) {
case AccessibleText.CHARACTER:
if (model instanceof AbstractDocument) {
((AbstractDocument)model).readLock();
}
AccessibleTextSequence charSequence = null;
try {
if (index + direction < model.getLength() &&
index + direction >= 0) {
charSequence =
new AccessibleTextSequence(index + direction,
index + direction + 1,
model.getText(index + direction, 1));
}
} catch (BadLocationException e) {
// we are intentionally silent; our contract says we return
// null if there is any failure in this method
} finally {
if (model instanceof AbstractDocument) {
((AbstractDocument)model).readUnlock();
}
}
return charSequence;
case AccessibleText.WORD:
case AccessibleText.SENTENCE:
if (model instanceof AbstractDocument) {
((AbstractDocument)model).readLock();
}
AccessibleTextSequence rangeSequence = null;
try {
IndexedSegment seg = getSegmentAt(part, index);
if (seg != null) {
if (direction != 0) {
int next;
if (direction < 0) {
next = seg.modelOffset - 1;
}
else {
next = seg.modelOffset + seg.count;
}
if (next >= 0 && next <= model.getLength()) {
seg = getSegmentAt(part, next);
}
else {
seg = null;
}
}
if (seg != null &&
(seg.offset + seg.count) <= model.getLength()) {
rangeSequence =
new AccessibleTextSequence (seg.offset,
seg.offset + seg.count,
new String(seg.array, seg.offset, seg.count));
} // else we leave rangeSequence set to null
}
} catch(BadLocationException e) {
// we are intentionally silent; our contract says we return
// null if there is any failure in this method
} finally {
if (model instanceof AbstractDocument) {
((AbstractDocument)model).readUnlock();
}
}
return rangeSequence;
case AccessibleExtendedText.LINE:
AccessibleTextSequence lineSequence = null;
if (model instanceof AbstractDocument) {
((AbstractDocument)model).readLock();
}
try {
int startIndex =
Utilities.getRowStart(JTextComponent.this, index);
int endIndex =
Utilities.getRowEnd(JTextComponent.this, index);
if (startIndex >= 0 && endIndex >= startIndex) {
if (direction == 0) {
lineSequence =
new AccessibleTextSequence(startIndex, endIndex,
model.getText(startIndex,
endIndex - startIndex + 1));
} else if (direction == -1 && startIndex > 0) {
endIndex =
Utilities.getRowEnd(JTextComponent.this,
startIndex - 1);
startIndex =
Utilities.getRowStart(JTextComponent.this,
startIndex - 1);
if (startIndex >= 0 && endIndex >= startIndex) {
lineSequence =
new AccessibleTextSequence(startIndex,
endIndex,
model.getText(startIndex,
endIndex - startIndex + 1));
}
} else if (direction == 1 &&
endIndex < model.getLength()) {
startIndex =
Utilities.getRowStart(JTextComponent.this,
endIndex + 1);
endIndex =
Utilities.getRowEnd(JTextComponent.this,
endIndex + 1);
if (startIndex >= 0 && endIndex >= startIndex) {
lineSequence =
new AccessibleTextSequence(startIndex,
endIndex, model.getText(startIndex,
endIndex - startIndex + 1));
}
}
// already validated 'direction' above...
}
} catch(BadLocationException e) {
// we are intentionally silent; our contract says we return
// null if there is any failure in this method
} finally {
if (model instanceof AbstractDocument) {
((AbstractDocument)model).readUnlock();
}
}
return lineSequence;
case AccessibleExtendedText.ATTRIBUTE_RUN:
// assumptions: (1) that all characters in a single element
// share the same attribute set; (2) that adjacent elements
// *may* share the same attribute set
int attributeRunStartIndex, attributeRunEndIndex;
String runText = null;
if (model instanceof AbstractDocument) {
((AbstractDocument)model).readLock();
}
try {
attributeRunStartIndex = attributeRunEndIndex =
Integer.MIN_VALUE;
int tempIndex = index;
switch (direction) {
case -1:
// going backwards, so find left edge of this run -
// that'll be the end of the previous run
// (off-by-one counting)
attributeRunEndIndex = getRunEdge(index, direction);
// now set ourselves up to find the left edge of the
// prev. run
tempIndex = attributeRunEndIndex - 1;
break;
case 1:
// going forward, so find right edge of this run -
// that'll be the start of the next run
// (off-by-one counting)
attributeRunStartIndex = getRunEdge(index, direction);
// now set ourselves up to find the right edge of the
// next run
tempIndex = attributeRunStartIndex;
break;
case 0:
// interested in the current run, so nothing special to
// set up in advance...
break;
default:
// only those three values of direction allowed...
throw new AssertionError(direction);
}
// set the unset edge; if neither set then we're getting
// both edges of the current run around our 'index'
attributeRunStartIndex =
(attributeRunStartIndex != Integer.MIN_VALUE) ?
attributeRunStartIndex : getRunEdge(tempIndex, -1);
attributeRunEndIndex =
(attributeRunEndIndex != Integer.MIN_VALUE) ?
attributeRunEndIndex : getRunEdge(tempIndex, 1);
runText = model.getText(attributeRunStartIndex,
attributeRunEndIndex -
attributeRunStartIndex);
} catch (BadLocationException e) {
// we are intentionally silent; our contract says we return
// null if there is any failure in this method
return null;
} finally {
if (model instanceof AbstractDocument) {
((AbstractDocument)model).readUnlock();
}
}
return new AccessibleTextSequence(attributeRunStartIndex,
attributeRunEndIndex,
runText);
default:
break;
}
return null;
}
/**
* Starting at text position <code>index</code>, and going in
* <code>direction</code>, return the edge of run that shares the
* same <code>AttributeSet</code> and parent element as those at
* <code>index</code>.
*
* Note: we assume the document is already locked...
*/
private int getRunEdge(int index, int direction) throws
BadLocationException {
if (index < 0 || index >= model.getLength()) {
throw new BadLocationException("Location out of bounds", index);
}
// locate the Element at index
Element indexElement;
// locate the Element at our index/offset
int elementIndex = -1; // test for initialization
for (indexElement = model.getDefaultRootElement();
! indexElement.isLeaf(); ) {
elementIndex = indexElement.getElementIndex(index);
indexElement = indexElement.getElement(elementIndex);
}
if (elementIndex == -1) {
throw new AssertionError(index);
}
// cache the AttributeSet and parentElement atindex
AttributeSet indexAS = indexElement.getAttributes();
Element parent = indexElement.getParentElement();
// find the first Element before/after ours w/the same AttributeSet
// if we are already at edge of the first element in our parent
// then return that edge
Element edgeElement;
switch (direction) {
case -1:
case 1:
int edgeElementIndex = elementIndex;
int elementCount = parent.getElementCount();
while ((edgeElementIndex + direction) > 0 &&
((edgeElementIndex + direction) < elementCount) &&
parent.getElement(edgeElementIndex
+ direction).getAttributes().isEqual(indexAS)) {
edgeElementIndex += direction;
}
edgeElement = parent.getElement(edgeElementIndex);
break;
default:
throw new AssertionError(direction);
}
switch (direction) {
case -1:
return edgeElement.getStartOffset();
case 1:
return edgeElement.getEndOffset();
default:
// we already caught this case earlier; this is to satisfy
// the compiler...
return Integer.MIN_VALUE;
}
}
// getTextRange() not needed; defined in AccessibleEditableText
/**
* Returns the <code>AccessibleTextSequence</code> at a given
* <code>index</code>.
*
* @param part the <code>CHARACTER</code>, <code>WORD</code>,
* <code>SENTENCE</code>, <code>LINE</code> or
* <code>ATTRIBUTE_RUN</code> to retrieve
* @param index an index within the text
* @return an <code>AccessibleTextSequence</code> specifying the text if
* <code>part</code> and <code>index</code> are valid. Otherwise,
* <code>null</code> is returned
*
* @see javax.accessibility.AccessibleText#CHARACTER
* @see javax.accessibility.AccessibleText#WORD
* @see javax.accessibility.AccessibleText#SENTENCE
* @see javax.accessibility.AccessibleExtendedText#LINE
* @see javax.accessibility.AccessibleExtendedText#ATTRIBUTE_RUN
*
* @since 1.6
*/
public AccessibleTextSequence getTextSequenceAt(int part, int index) {
return getSequenceAtIndex(part, index, 0);
}
/**
* Returns the <code>AccessibleTextSequence</code> after a given
* <code>index</code>.
*
* @param part the <code>CHARACTER</code>, <code>WORD</code>,
* <code>SENTENCE</code>, <code>LINE</code> or
* <code>ATTRIBUTE_RUN</code> to retrieve
* @param index an index within the text
* @return an <code>AccessibleTextSequence</code> specifying the text
* if <code>part</code> and <code>index</code> are valid. Otherwise,
* <code>null</code> is returned
*
* @see javax.accessibility.AccessibleText#CHARACTER
* @see javax.accessibility.AccessibleText#WORD
* @see javax.accessibility.AccessibleText#SENTENCE
* @see javax.accessibility.AccessibleExtendedText#LINE
* @see javax.accessibility.AccessibleExtendedText#ATTRIBUTE_RUN
*
* @since 1.6
*/
public AccessibleTextSequence getTextSequenceAfter(int part, int index) {
return getSequenceAtIndex(part, index, 1);
}
/**
* Returns the <code>AccessibleTextSequence</code> before a given
* <code>index</code>.
*
* @param part the <code>CHARACTER</code>, <code>WORD</code>,
* <code>SENTENCE</code>, <code>LINE</code> or
* <code>ATTRIBUTE_RUN</code> to retrieve
* @param index an index within the text
* @return an <code>AccessibleTextSequence</code> specifying the text
* if <code>part</code> and <code>index</code> are valid. Otherwise,
* <code>null</code> is returned
*
* @see javax.accessibility.AccessibleText#CHARACTER
* @see javax.accessibility.AccessibleText#WORD
* @see javax.accessibility.AccessibleText#SENTENCE
* @see javax.accessibility.AccessibleExtendedText#LINE
* @see javax.accessibility.AccessibleExtendedText#ATTRIBUTE_RUN
*
* @since 1.6
*/
public AccessibleTextSequence getTextSequenceBefore(int part, int index) {
return getSequenceAtIndex(part, index, -1);
}
/**
* Returns the <code>Rectangle</code> enclosing the text between
* two indicies.
*
* @param startIndex the start index in the text
* @param endIndex the end index in the text
* @return the bounding rectangle of the text if the indices are valid.
* Otherwise, <code>null</code> is returned
*
* @since 1.6
*/
public Rectangle getTextBounds(int startIndex, int endIndex) {
if (startIndex < 0 || startIndex > model.getLength()-1 ||
endIndex < 0 || endIndex > model.getLength()-1 ||
startIndex > endIndex) {
return null;
}
TextUI ui = getUI();
if (ui == null) {
return null;
}
Rectangle rect = null;
Rectangle alloc = getRootEditorRect();
if (alloc == null) {
return null;
}
if (model instanceof AbstractDocument) {
((AbstractDocument)model).readLock();
}
try {
View rootView = ui.getRootView(JTextComponent.this);
if (rootView != null) {
Shape bounds = rootView.modelToView(startIndex,
Position.Bias.Forward, endIndex,
Position.Bias.Backward, alloc);
rect = (bounds instanceof Rectangle) ?
(Rectangle)bounds : bounds.getBounds();
}
} catch (BadLocationException e) {
} finally {
if (model instanceof AbstractDocument) {
((AbstractDocument)model).readUnlock();
}
}
return rect;
}
// ----- end AccessibleExtendedText methods
// --- interface AccessibleAction methods ------------------------
public AccessibleAction getAccessibleAction() {
return this;
}
/**
* Returns the number of accessible actions available in this object
* If there are more than one, the first one is considered the
* "default" action of the object.
*
* @return the zero-based number of Actions in this object
* @since 1.4
*/
public int getAccessibleActionCount() {
Action [] actions = JTextComponent.this.getActions();
return actions.length;
}
/**
* Returns a description of the specified action of the object.
*
* @param i zero-based index of the actions
* @return a String description of the action
* @see #getAccessibleActionCount
* @since 1.4
*/
public String getAccessibleActionDescription(int i) {
Action [] actions = JTextComponent.this.getActions();
if (i < 0 || i >= actions.length) {
return null;
}
return (String)actions[i].getValue(Action.NAME);
}
/**
* Performs the specified Action on the object
*
* @param i zero-based index of actions
* @return true if the action was performed; otherwise false.
* @see #getAccessibleActionCount
* @since 1.4
*/
public boolean doAccessibleAction(int i) {
Action [] actions = JTextComponent.this.getActions();
if (i < 0 || i >= actions.length) {
return false;
}
ActionEvent ae =
new ActionEvent(JTextComponent.this,
ActionEvent.ACTION_PERFORMED, null,
EventQueue.getMostRecentEventTime(),
getCurrentEventModifiers());
actions[i].actionPerformed(ae);
return true;
}
// ----- end AccessibleAction methods
}
// --- serialization ---------------------------------------------
private void readObject(ObjectInputStream s)
throws IOException, ClassNotFoundException
{
s.defaultReadObject();
caretEvent = new MutableCaretEvent(this);
addMouseListener(caretEvent);
addFocusListener(caretEvent);
}
// --- member variables ----------------------------------
/**
* The document model.
*/
private Document model;
/**
* The caret used to display the insert position
* and navigate throughout the document.
*
* PENDING(prinz)
* This should be serializable, default installed
* by UI.
*/
private transient Caret caret;
/**
* Object responsible for restricting the cursor navigation.
*/
private NavigationFilter navigationFilter;
/**
* The object responsible for managing highlights.
*
* PENDING(prinz)
* This should be serializable, default installed
* by UI.
*/
private transient Highlighter highlighter;
/**
* The current key bindings in effect.
*
* PENDING(prinz)
* This should be serializable, default installed
* by UI.
*/
private transient Keymap keymap;
private transient MutableCaretEvent caretEvent;
private Color caretColor;
private Color selectionColor;
private Color selectedTextColor;
private Color disabledTextColor;
private boolean editable;
private Insets margin;
private char focusAccelerator;
private boolean dragEnabled;
/**
* The drop mode for this component.
*/
private DropMode dropMode = DropMode.USE_SELECTION;
/**
* The drop location.
*/
private transient DropLocation dropLocation;
/**
* Represents a drop location for <code>JTextComponent</code>s.
*
* @see #getDropLocation
* @since 1.6
*/
public static final class DropLocation extends TransferHandler.DropLocation {
private final int index;
private final Position.Bias bias;
private DropLocation(Point p, int index, Position.Bias bias) {
super(p);
this.index = index;
this.bias = bias;
}
/**
* Returns the index where dropped data should be inserted into the
* associated component. This index represents a position between
* characters, as would be interpreted by a caret.
*
* @return the drop index
*/
public int getIndex() {
return index;
}
/**
* Returns the bias for the drop index.
*
* @return the drop bias
*/
public Position.Bias getBias() {
return bias;
}
/**
* 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() + ","
+ "index=" + index + ","
+ "bias=" + bias + "]";
}
}
/**
* TransferHandler used if one hasn't been supplied by the UI.
*/
private static DefaultTransferHandler defaultTransferHandler;
/**
* Maps from class name to Boolean indicating if
* <code>processInputMethodEvent</code> has been overriden.
*/
private static Cache<Class<?>,Boolean> METHOD_OVERRIDDEN
= new Cache<Class<?>,Boolean>(Cache.Kind.WEAK, Cache.Kind.STRONG) {
/**
* Returns {@code true} if the specified {@code type} extends {@link JTextComponent}
* and the {@link JTextComponent#processInputMethodEvent} method is overridden.
*/
@Override
public Boolean create(final Class<?> type) {
if (JTextComponent.class == type) {
return Boolean.FALSE;
}
if (get(type.getSuperclass())) {
return Boolean.TRUE;
}
return AccessController.doPrivileged(
new PrivilegedAction<Boolean>() {
public Boolean run() {
try {
type.getDeclaredMethod("processInputMethodEvent", InputMethodEvent.class);
return Boolean.TRUE;
} catch (NoSuchMethodException exception) {
return Boolean.FALSE;
}
}
});
}
};
/**
* Returns a string representation of this <code>JTextComponent</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>.
* <P>
* Overriding <code>paramString</code> to provide information about the
* specific new aspects of the JFC components.
*
* @return a string representation of this <code>JTextComponent</code>
*/
protected String paramString() {
String editableString = (editable ?
"true" : "false");
String caretColorString = (caretColor != null ?
caretColor.toString() : "");
String selectionColorString = (selectionColor != null ?
selectionColor.toString() : "");
String selectedTextColorString = (selectedTextColor != null ?
selectedTextColor.toString() : "");
String disabledTextColorString = (disabledTextColor != null ?
disabledTextColor.toString() : "");
String marginString = (margin != null ?
margin.toString() : "");
return super.paramString() +
",caretColor=" + caretColorString +
",disabledTextColor=" + disabledTextColorString +
",editable=" + editableString +
",margin=" + marginString +
",selectedTextColor=" + selectedTextColorString +
",selectionColor=" + selectionColorString;
}
/**
* A Simple TransferHandler that exports the data as a String, and
* imports the data from the String clipboard. This is only used
* if the UI hasn't supplied one, which would only happen if someone
* hasn't subclassed Basic.
*/
static class DefaultTransferHandler extends TransferHandler implements
UIResource {
public void exportToClipboard(JComponent comp, Clipboard clipboard,
int action) throws IllegalStateException {
if (comp instanceof JTextComponent) {
JTextComponent text = (JTextComponent)comp;
int p0 = text.getSelectionStart();
int p1 = text.getSelectionEnd();
if (p0 != p1) {
try {
Document doc = text.getDocument();
String srcData = doc.getText(p0, p1 - p0);
StringSelection contents =new StringSelection(srcData);
// this may throw an IllegalStateException,
// but it will be caught and handled in the
// action that invoked this method
clipboard.setContents(contents, null);
if (action == TransferHandler.MOVE) {
doc.remove(p0, p1 - p0);
}
} catch (BadLocationException ble) {}
}
}
}
public boolean importData(JComponent comp, Transferable t) {
if (comp instanceof JTextComponent) {
DataFlavor flavor = getFlavor(t.getTransferDataFlavors());
if (flavor != null) {
InputContext ic = comp.getInputContext();
if (ic != null) {
ic.endComposition();
}
try {
String data = (String)t.getTransferData(flavor);
((JTextComponent)comp).replaceSelection(data);
return true;
} catch (UnsupportedFlavorException ufe) {
} catch (IOException ioe) {
}
}
}
return false;
}
public boolean canImport(JComponent comp,
DataFlavor[] transferFlavors) {
JTextComponent c = (JTextComponent)comp;
if (!(c.isEditable() && c.isEnabled())) {
return false;
}
return (getFlavor(transferFlavors) != null);
}
public int getSourceActions(JComponent c) {
return NONE;
}
private DataFlavor getFlavor(DataFlavor[] flavors) {
if (flavors != null) {
for (DataFlavor flavor : flavors) {
if (flavor.equals(DataFlavor.stringFlavor)) {
return flavor;
}
}
}
return null;
}
}
/**
* Returns the JTextComponent that most recently had focus. The returned
* value may currently have focus.
*/
static final JTextComponent getFocusedComponent() {
return (JTextComponent)AppContext.getAppContext().
get(FOCUSED_COMPONENT);
}
private int getCurrentEventModifiers() {
int modifiers = 0;
AWTEvent currentEvent = EventQueue.getCurrentEvent();
if (currentEvent instanceof InputEvent) {
modifiers = ((InputEvent)currentEvent).getModifiers();
} else if (currentEvent instanceof ActionEvent) {
modifiers = ((ActionEvent)currentEvent).getModifiers();
}
return modifiers;
}
private static final Object KEYMAP_TABLE =
new StringBuilder("JTextComponent_KeymapTable");
//
// member variables used for on-the-spot input method
// editing style support
//
private transient InputMethodRequests inputMethodRequestsHandler;
private SimpleAttributeSet composedTextAttribute;
private String composedTextContent;
private Position composedTextStart;
private Position composedTextEnd;
private Position latestCommittedTextStart;
private Position latestCommittedTextEnd;
private ComposedTextCaret composedTextCaret;
private transient Caret originalCaret;
/**
* Set to true after the check for the override of processInputMethodEvent
* has been checked.
*/
private boolean checkedInputOverride;
private boolean needToSendKeyTypedEvent;
static class DefaultKeymap implements Keymap {
DefaultKeymap(String nm, Keymap parent) {
this.nm = nm;
this.parent = parent;
bindings = new Hashtable<KeyStroke, Action>();
}
/**
* Fetch the default action to fire if a
* key is typed (ie a KEY_TYPED KeyEvent is received)
* and there is no binding for it. Typically this
* would be some action that inserts text so that
* the keymap doesn't require an action for each
* possible key.
*/
public Action getDefaultAction() {
if (defaultAction != null) {
return defaultAction;
}
return (parent != null) ? parent.getDefaultAction() : null;
}
/**
* Set the default action to fire if a key is typed.
*/
public void setDefaultAction(Action a) {
defaultAction = a;
}
public String getName() {
return nm;
}
public Action getAction(KeyStroke key) {
Action a = bindings.get(key);
if ((a == null) && (parent != null)) {
a = parent.getAction(key);
}
return a;
}
public KeyStroke[] getBoundKeyStrokes() {
KeyStroke[] keys = new KeyStroke[bindings.size()];
int i = 0;
for (Enumeration<KeyStroke> e = bindings.keys() ; e.hasMoreElements() ;) {
keys[i++] = e.nextElement();
}
return keys;
}
public Action[] getBoundActions() {
Action[] actions = new Action[bindings.size()];
int i = 0;
for (Enumeration<Action> e = bindings.elements() ; e.hasMoreElements() ;) {
actions[i++] = e.nextElement();
}
return actions;
}
public KeyStroke[] getKeyStrokesForAction(Action a) {
if (a == null) {
return null;
}
KeyStroke[] retValue = null;
// Determine local bindings first.
Vector<KeyStroke> keyStrokes = null;
for (Enumeration<KeyStroke> keys = bindings.keys(); keys.hasMoreElements();) {
KeyStroke key = keys.nextElement();
if (bindings.get(key) == a) {
if (keyStrokes == null) {
keyStrokes = new Vector<KeyStroke>();
}
keyStrokes.addElement(key);
}
}
// See if the parent has any.
if (parent != null) {
KeyStroke[] pStrokes = parent.getKeyStrokesForAction(a);
if (pStrokes != null) {
// Remove any bindings defined in the parent that
// are locally defined.
int rCount = 0;
for (int counter = pStrokes.length - 1; counter >= 0;
counter--) {
if (isLocallyDefined(pStrokes[counter])) {
pStrokes[counter] = null;
rCount++;
}
}
if (rCount > 0 && rCount < pStrokes.length) {
if (keyStrokes == null) {
keyStrokes = new Vector<KeyStroke>();
}
for (int counter = pStrokes.length - 1; counter >= 0;
counter--) {
if (pStrokes[counter] != null) {
keyStrokes.addElement(pStrokes[counter]);
}
}
}
else if (rCount == 0) {
if (keyStrokes == null) {
retValue = pStrokes;
}
else {
retValue = new KeyStroke[keyStrokes.size() +
pStrokes.length];
keyStrokes.copyInto(retValue);
System.arraycopy(pStrokes, 0, retValue,
keyStrokes.size(), pStrokes.length);
keyStrokes = null;
}
}
}
}
if (keyStrokes != null) {
retValue = new KeyStroke[keyStrokes.size()];
keyStrokes.copyInto(retValue);
}
return retValue;
}
public boolean isLocallyDefined(KeyStroke key) {
return bindings.containsKey(key);
}
public void addActionForKeyStroke(KeyStroke key, Action a) {
bindings.put(key, a);
}
public void removeKeyStrokeBinding(KeyStroke key) {
bindings.remove(key);
}
public void removeBindings() {
bindings.clear();
}
public Keymap getResolveParent() {
return parent;
}
public void setResolveParent(Keymap parent) {
this.parent = parent;
}
/**
* String representation of the keymap... potentially
* a very long string.
*/
public String toString() {
return "Keymap[" + nm + "]" + bindings;
}
String nm;
Keymap parent;
Hashtable<KeyStroke, Action> bindings;
Action defaultAction;
}
/**
* KeymapWrapper wraps a Keymap inside an InputMap. For KeymapWrapper
* to be useful it must be used with a KeymapActionMap.
* KeymapWrapper for the most part, is an InputMap with two parents.
* The first parent visited is ALWAYS the Keymap, with the second
* parent being the parent inherited from InputMap. If
* <code>keymap.getAction</code> returns null, implying the Keymap
* does not have a binding for the KeyStroke,
* the parent is then visited. If the Keymap has a binding, the
* Action is returned, if not and the KeyStroke represents a
* KeyTyped event and the Keymap has a defaultAction,
* <code>DefaultActionKey</code> is returned.
* <p>KeymapActionMap is then able to transate the object passed in
* to either message the Keymap, or message its default implementation.
*/
static class KeymapWrapper extends InputMap {
static final Object DefaultActionKey = new Object();
private Keymap keymap;
KeymapWrapper(Keymap keymap) {
this.keymap = keymap;
}
public KeyStroke[] keys() {
KeyStroke[] sKeys = super.keys();
KeyStroke[] keymapKeys = keymap.getBoundKeyStrokes();
int sCount = (sKeys == null) ? 0 : sKeys.length;
int keymapCount = (keymapKeys == null) ? 0 : keymapKeys.length;
if (sCount == 0) {
return keymapKeys;
}
if (keymapCount == 0) {
return sKeys;
}
KeyStroke[] retValue = new KeyStroke[sCount + keymapCount];
// There may be some duplication here...
System.arraycopy(sKeys, 0, retValue, 0, sCount);
System.arraycopy(keymapKeys, 0, retValue, sCount, keymapCount);
return retValue;
}
public int size() {
// There may be some duplication here...
KeyStroke[] keymapStrokes = keymap.getBoundKeyStrokes();
int keymapCount = (keymapStrokes == null) ? 0:
keymapStrokes.length;
return super.size() + keymapCount;
}
public Object get(KeyStroke keyStroke) {
Object retValue = keymap.getAction(keyStroke);
if (retValue == null) {
retValue = super.get(keyStroke);
if (retValue == null &&
keyStroke.getKeyChar() != KeyEvent.CHAR_UNDEFINED &&
keymap.getDefaultAction() != null) {
// Implies this is a KeyTyped event, use the default
// action.
retValue = DefaultActionKey;
}
}
return retValue;
}
}
/**
* Wraps a Keymap inside an ActionMap. This is used with
* a KeymapWrapper. If <code>get</code> is passed in
* <code>KeymapWrapper.DefaultActionKey</code>, the default action is
* returned, otherwise if the key is an Action, it is returned.
*/
static class KeymapActionMap extends ActionMap {
private Keymap keymap;
KeymapActionMap(Keymap keymap) {
this.keymap = keymap;
}
public Object[] keys() {
Object[] sKeys = super.keys();
Object[] keymapKeys = keymap.getBoundActions();
int sCount = (sKeys == null) ? 0 : sKeys.length;
int keymapCount = (keymapKeys == null) ? 0 : keymapKeys.length;
boolean hasDefault = (keymap.getDefaultAction() != null);
if (hasDefault) {
keymapCount++;
}
if (sCount == 0) {
if (hasDefault) {
Object[] retValue = new Object[keymapCount];
if (keymapCount > 1) {
System.arraycopy(keymapKeys, 0, retValue, 0,
keymapCount - 1);
}
retValue[keymapCount - 1] = KeymapWrapper.DefaultActionKey;
return retValue;
}
return keymapKeys;
}
if (keymapCount == 0) {
return sKeys;
}
Object[] retValue = new Object[sCount + keymapCount];
// There may be some duplication here...
System.arraycopy(sKeys, 0, retValue, 0, sCount);
if (hasDefault) {
if (keymapCount > 1) {
System.arraycopy(keymapKeys, 0, retValue, sCount,
keymapCount - 1);
}
retValue[sCount + keymapCount - 1] = KeymapWrapper.
DefaultActionKey;
}
else {
System.arraycopy(keymapKeys, 0, retValue, sCount, keymapCount);
}
return retValue;
}
public int size() {
// There may be some duplication here...
Object[] actions = keymap.getBoundActions();
int keymapCount = (actions == null) ? 0 : actions.length;
if (keymap.getDefaultAction() != null) {
keymapCount++;
}
return super.size() + keymapCount;
}
public Action get(Object key) {
Action retValue = super.get(key);
if (retValue == null) {
// Try the Keymap.
if (key == KeymapWrapper.DefaultActionKey) {
retValue = keymap.getDefaultAction();
}
else if (key instanceof Action) {
// This is a little iffy, technically an Action is
// a valid Key. We're assuming the Action came from
// the InputMap though.
retValue = (Action)key;
}
}
return retValue;
}
}
private static final Object FOCUSED_COMPONENT =
new StringBuilder("JTextComponent_FocusedComponent");
/**
* The default keymap that will be shared by all
* <code>JTextComponent</code> instances unless they
* have had a different keymap set.
*/
public static final String DEFAULT_KEYMAP = "default";
/**
* Event to use when firing a notification of change to caret
* position. This is mutable so that the event can be reused
* since caret events can be fairly high in bandwidth.
*/
static class MutableCaretEvent extends CaretEvent implements ChangeListener, FocusListener, MouseListener {
MutableCaretEvent(JTextComponent c) {
super(c);
}
final void fire() {
JTextComponent c = (JTextComponent) getSource();
if (c != null) {
Caret caret = c.getCaret();
dot = caret.getDot();
mark = caret.getMark();
c.fireCaretUpdate(this);
}
}
public final String toString() {
return "dot=" + dot + "," + "mark=" + mark;
}
// --- CaretEvent methods -----------------------
public final int getDot() {
return dot;
}
public final int getMark() {
return mark;
}
// --- ChangeListener methods -------------------
public final void stateChanged(ChangeEvent e) {
if (! dragActive) {
fire();
}
}
// --- FocusListener methods -----------------------------------
public void focusGained(FocusEvent fe) {
AppContext.getAppContext().put(FOCUSED_COMPONENT,
fe.getSource());
}
public void focusLost(FocusEvent fe) {
}
// --- MouseListener methods -----------------------------------
/**
* Requests focus on the associated
* text component, and try to set the cursor position.
*
* @param e the mouse event
* @see MouseListener#mousePressed
*/
public final void mousePressed(MouseEvent e) {
dragActive = true;
}
/**
* Called when the mouse is released.
*
* @param e the mouse event
* @see MouseListener#mouseReleased
*/
public final void mouseReleased(MouseEvent e) {
dragActive = false;
fire();
}
public final void mouseClicked(MouseEvent e) {
}
public final void mouseEntered(MouseEvent e) {
}
public final void mouseExited(MouseEvent e) {
}
private boolean dragActive;
private int dot;
private int mark;
}
//
// Process any input method events that the component itself
// recognizes. The default on-the-spot handling for input method
// composed(uncommitted) text is done here after all input
// method listeners get called for stealing the events.
//
protected void processInputMethodEvent(InputMethodEvent e) {
// let listeners handle the events
super.processInputMethodEvent(e);
if (!e.isConsumed()) {
if (! isEditable()) {
return;
} else {
switch (e.getID()) {
case InputMethodEvent.INPUT_METHOD_TEXT_CHANGED:
replaceInputMethodText(e);
// fall through
case InputMethodEvent.CARET_POSITION_CHANGED:
setInputMethodCaretPosition(e);
break;
}
}
e.consume();
}
}
//
// Overrides this method to become an active input method client.
//
public InputMethodRequests getInputMethodRequests() {
if (inputMethodRequestsHandler == null) {
inputMethodRequestsHandler = new InputMethodRequestsHandler();
Document doc = getDocument();
if (doc != null) {
doc.addDocumentListener((DocumentListener)inputMethodRequestsHandler);
}
}
return inputMethodRequestsHandler;
}
//
// Overrides this method to watch the listener installed.
//
public void addInputMethodListener(InputMethodListener l) {
super.addInputMethodListener(l);
if (l != null) {
needToSendKeyTypedEvent = false;
checkedInputOverride = true;
}
}
//
// Default implementation of the InputMethodRequests interface.
//
class InputMethodRequestsHandler implements InputMethodRequests, DocumentListener {
// --- InputMethodRequests methods ---
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