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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* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
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* by Oracle in the LICENSE file that accompanied this code.
*
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* 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).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
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package javax.swing;
import java.util.List;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import javax.swing.plaf.*;
import javax.accessibility.*;
import java.awt.Component;
import java.awt.Container;
import java.awt.DefaultFocusTraversalPolicy;
import java.awt.FocusTraversalPolicy;
import java.awt.Window;
import java.io.ObjectOutputStream;
import java.io.ObjectInputStream;
import java.io.IOException;
import java.beans.PropertyVetoException;
import java.util.Set;
import java.util.TreeSet;
import java.util.LinkedHashSet;
/**
* A container used to create a multiple-document interface or a virtual desktop.
* You create <code>JInternalFrame</code> objects and add them to the
* <code>JDesktopPane</code>. <code>JDesktopPane</code> extends
* <code>JLayeredPane</code> to manage the potentially overlapping internal
* frames. It also maintains a reference to an instance of
* <code>DesktopManager</code> that is set by the UI
* class for the current look and feel (L&F). Note that <code>JDesktopPane</code>
* does not support borders.
* <p>
* This class is normally used as the parent of <code>JInternalFrames</code>
* to provide a pluggable <code>DesktopManager</code> object to the
* <code>JInternalFrames</code>. The <code>installUI</code> of the
* L&F specific implementation is responsible for setting the
* <code>desktopManager</code> variable appropriately.
* When the parent of a <code>JInternalFrame</code> is a <code>JDesktopPane</code>,
* it should delegate most of its behavior to the <code>desktopManager</code>
* (closing, resizing, etc).
* <p>
* For further documentation and examples see
* <a href="https://docs.oracle.com/javase/tutorial/uiswing/components/internalframe.html">How to Use Internal Frames</a>,
* a section in <em>The Java Tutorial</em>.
* <p>
* <strong>Warning:</strong> Swing is not thread safe. For more
* information see <a
* href="package-summary.html#threading">Swing's Threading
* Policy</a>.
* <p>
* <strong>Warning:</strong>
* Serialized objects of this class will not be compatible with
* future Swing releases. The current serialization support is
* appropriate for short term storage or RMI between applications running
* the same version of Swing. As of 1.4, support for long term storage
* of all JavaBeans™
* has been added to the <code>java.beans</code> package.
* Please see {@link java.beans.XMLEncoder}.
*
* @see JInternalFrame
* @see JInternalFrame.JDesktopIcon
* @see DesktopManager
*
* @author David Kloba
*/
public class JDesktopPane extends JLayeredPane implements Accessible
{
/**
* @see #getUIClassID
* @see #readObject
*/
private static final String uiClassID = "DesktopPaneUI";
transient DesktopManager desktopManager;
private transient JInternalFrame selectedFrame = null;
/**
* Indicates that the entire contents of the item being dragged
* should appear inside the desktop pane.
*
* @see #OUTLINE_DRAG_MODE
* @see #setDragMode
*/
public static final int LIVE_DRAG_MODE = 0;
/**
* Indicates that an outline only of the item being dragged
* should appear inside the desktop pane.
*
* @see #LIVE_DRAG_MODE
* @see #setDragMode
*/
public static final int OUTLINE_DRAG_MODE = 1;
private int dragMode = LIVE_DRAG_MODE;
private boolean dragModeSet = false;
private transient List<JInternalFrame> framesCache;
private boolean componentOrderCheckingEnabled = true;
private boolean componentOrderChanged = false;
/**
* Creates a new <code>JDesktopPane</code>.
*/
public JDesktopPane() {
setUIProperty("opaque", Boolean.TRUE);
setFocusCycleRoot(true);
setFocusTraversalPolicy(new LayoutFocusTraversalPolicy() {
public Component getDefaultComponent(Container c) {
JInternalFrame jifArray[] = getAllFrames();
Component comp = null;
for (JInternalFrame jif : jifArray) {
comp = jif.getFocusTraversalPolicy().getDefaultComponent(jif);
if (comp != null) {
break;
}
}
return comp;
}
});
updateUI();
}
/**
* Returns the L&F object that renders this component.
*
* @return the <code>DesktopPaneUI</code> object that
* renders this component
*/
public DesktopPaneUI getUI() {
return (DesktopPaneUI)ui;
}
/**
* Sets the L&F object that renders this component.
*
* @param ui the DesktopPaneUI L&F object
* @see UIDefaults#getUI
* @beaninfo
* bound: true
* hidden: true
* attribute: visualUpdate true
* description: The UI object that implements the Component's LookAndFeel.
*/
public void setUI(DesktopPaneUI ui) {
super.setUI(ui);
}
/**
* Sets the "dragging style" used by the desktop pane.
* You may want to change to one mode or another for
* performance or aesthetic reasons.
*
* @param dragMode the style of drag to use for items in the Desktop
*
* @see #LIVE_DRAG_MODE
* @see #OUTLINE_DRAG_MODE
*
* @beaninfo
* bound: true
* description: Dragging style for internal frame children.
* enum: LIVE_DRAG_MODE JDesktopPane.LIVE_DRAG_MODE
* OUTLINE_DRAG_MODE JDesktopPane.OUTLINE_DRAG_MODE
* @since 1.3
*/
public void setDragMode(int dragMode) {
int oldDragMode = this.dragMode;
this.dragMode = dragMode;
firePropertyChange("dragMode", oldDragMode, this.dragMode);
dragModeSet = true;
}
/**
* Gets the current "dragging style" used by the desktop pane.
* @return either <code>Live_DRAG_MODE</code> or
* <code>OUTLINE_DRAG_MODE</code>
* @see #setDragMode
* @since 1.3
*/
public int getDragMode() {
return dragMode;
}
/**
* Returns the <code>DesktopManger</code> that handles
* desktop-specific UI actions.
*/
public DesktopManager getDesktopManager() {
return desktopManager;
}
/**
* Sets the <code>DesktopManger</code> that will handle
* desktop-specific UI actions. This may be overridden by
* {@code LookAndFeel}.
*
* @param d the <code>DesktopManager</code> to use
*
* @beaninfo
* bound: true
* description: Desktop manager to handle the internal frames in the
* desktop pane.
*/
public void setDesktopManager(DesktopManager d) {
DesktopManager oldValue = desktopManager;
desktopManager = d;
firePropertyChange("desktopManager", oldValue, desktopManager);
}
/**
* Notification from the <code>UIManager</code> that the L&F has changed.
* Replaces the current UI object with the latest version from the
* <code>UIManager</code>.
*
* @see JComponent#updateUI
*/
public void updateUI() {
setUI((DesktopPaneUI)UIManager.getUI(this));
}
/**
* Returns the name of the L&F class that renders this component.
*
* @return the string "DesktopPaneUI"
* @see JComponent#getUIClassID
* @see UIDefaults#getUI
*/
public String getUIClassID() {
return uiClassID;
}
/**
* Returns all <code>JInternalFrames</code> currently displayed in the
* desktop. Returns iconified frames as well as expanded frames.
*
* @return an array of <code>JInternalFrame</code> objects
*/
public JInternalFrame[] getAllFrames() {
return getAllFrames(this).toArray(new JInternalFrame[0]);
}
private static Collection<JInternalFrame> getAllFrames(Container parent) {
int i, count;
Collection<JInternalFrame> results = new LinkedHashSet<>();
count = parent.getComponentCount();
for (i = 0; i < count; i++) {
Component next = parent.getComponent(i);
if (next instanceof JInternalFrame) {
results.add((JInternalFrame) next);
} else if (next instanceof JInternalFrame.JDesktopIcon) {
JInternalFrame tmp = ((JInternalFrame.JDesktopIcon) next).getInternalFrame();
if (tmp != null) {
results.add(tmp);
}
} else if (next instanceof Container) {
results.addAll(getAllFrames((Container) next));
}
}
return results;
}
/** Returns the currently active <code>JInternalFrame</code>
* in this <code>JDesktopPane</code>, or <code>null</code>
* if no <code>JInternalFrame</code> is currently active.
*
* @return the currently active <code>JInternalFrame</code> or
* <code>null</code>
* @since 1.3
*/
public JInternalFrame getSelectedFrame() {
return selectedFrame;
}
/** Sets the currently active <code>JInternalFrame</code>
* in this <code>JDesktopPane</code>. This method is used to bridge
* the package gap between JDesktopPane and the platform implementation
* code and should not be called directly. To visually select the frame
* the client must call JInternalFrame.setSelected(true) to activate
* the frame.
* @see JInternalFrame#setSelected(boolean)
*
* @param f the internal frame that's currently selected
* @since 1.3
*/
public void setSelectedFrame(JInternalFrame f) {
selectedFrame = f;
}
/**
* Returns all <code>JInternalFrames</code> currently displayed in the
* specified layer of the desktop. Returns iconified frames as well
* expanded frames.
*
* @param layer an int specifying the desktop layer
* @return an array of <code>JInternalFrame</code> objects
* @see JLayeredPane
*/
public JInternalFrame[] getAllFramesInLayer(int layer) {
Collection<JInternalFrame> allFrames = getAllFrames(this);
Iterator<JInternalFrame> iterator = allFrames.iterator();
while (iterator.hasNext()) {
if (iterator.next().getLayer() != layer) {
iterator.remove();
}
}
return allFrames.toArray(new JInternalFrame[0]);
}
private List<JInternalFrame> getFrames() {
Component c;
Set<ComponentPosition> set = new TreeSet<ComponentPosition>();
for (int i = 0; i < getComponentCount(); i++) {
c = getComponent(i);
if (c instanceof JInternalFrame) {
set.add(new ComponentPosition((JInternalFrame)c, getLayer(c),
i));
}
else if (c instanceof JInternalFrame.JDesktopIcon) {
c = ((JInternalFrame.JDesktopIcon)c).getInternalFrame();
set.add(new ComponentPosition((JInternalFrame)c, getLayer(c),
i));
}
}
List<JInternalFrame> frames = new ArrayList<JInternalFrame>(
set.size());
for (ComponentPosition position : set) {
frames.add(position.component);
}
return frames;
}
private static class ComponentPosition implements
Comparable<ComponentPosition> {
private final JInternalFrame component;
private final int layer;
private final int zOrder;
ComponentPosition(JInternalFrame component, int layer, int zOrder) {
this.component = component;
this.layer = layer;
this.zOrder = zOrder;
}
public int compareTo(ComponentPosition o) {
int delta = o.layer - layer;
if (delta == 0) {
return zOrder - o.zOrder;
}
return delta;
}
}
private JInternalFrame getNextFrame(JInternalFrame f, boolean forward) {
verifyFramesCache();
if (f == null) {
return getTopInternalFrame();
}
int i = framesCache.indexOf(f);
if (i == -1 || framesCache.size() == 1) {
/* error */
return null;
}
if (forward) {
// navigate to the next frame
if (++i == framesCache.size()) {
/* wrap */
i = 0;
}
}
else {
// navigate to the previous frame
if (--i == -1) {
/* wrap */
i = framesCache.size() - 1;
}
}
return framesCache.get(i);
}
JInternalFrame getNextFrame(JInternalFrame f) {
return getNextFrame(f, true);
}
private JInternalFrame getTopInternalFrame() {
if (framesCache.size() == 0) {
return null;
}
return framesCache.get(0);
}
private void updateFramesCache() {
framesCache = getFrames();
}
private void verifyFramesCache() {
// If framesCache is dirty, then recreate it.
if (componentOrderChanged) {
componentOrderChanged = false;
updateFramesCache();
}
}
/**
* {@inheritDoc}
*/
@Override
public void remove(Component comp) {
super.remove(comp);
updateFramesCache();
}
/**
* Selects the next <code>JInternalFrame</code> in this desktop pane.
*
* @param forward a boolean indicating which direction to select in;
* <code>true</code> for forward, <code>false</code> for
* backward
* @return the JInternalFrame that was selected or <code>null</code>
* if nothing was selected
* @since 1.6
*/
public JInternalFrame selectFrame(boolean forward) {
JInternalFrame selectedFrame = getSelectedFrame();
JInternalFrame frameToSelect = getNextFrame(selectedFrame, forward);
if (frameToSelect == null) {
return null;
}
// Maintain navigation traversal order until an
// external stack change, such as a click on a frame.
setComponentOrderCheckingEnabled(false);
if (forward && selectedFrame != null) {
selectedFrame.moveToBack(); // For Windows MDI fidelity.
}
try { frameToSelect.setSelected(true);
} catch (PropertyVetoException pve) {}
setComponentOrderCheckingEnabled(true);
return frameToSelect;
}
/*
* Sets whether component order checking is enabled.
* @param enable a boolean value, where <code>true</code> means
* a change in component order will cause a change in the keyboard
* navigation order.
* @since 1.6
*/
void setComponentOrderCheckingEnabled(boolean enable) {
componentOrderCheckingEnabled = enable;
}
/**
* {@inheritDoc}
* @since 1.6
*/
protected void addImpl(Component comp, Object constraints, int index) {
super.addImpl(comp, constraints, index);
if (componentOrderCheckingEnabled) {
if (comp instanceof JInternalFrame ||
comp instanceof JInternalFrame.JDesktopIcon) {
componentOrderChanged = true;
}
}
}
/**
* {@inheritDoc}
* @since 1.6
*/
public void remove(int index) {
if (componentOrderCheckingEnabled) {
Component comp = getComponent(index);
if (comp instanceof JInternalFrame ||
comp instanceof JInternalFrame.JDesktopIcon) {
componentOrderChanged = true;
}
}
super.remove(index);
}
/**
* {@inheritDoc}
* @since 1.6
*/
public void removeAll() {
if (componentOrderCheckingEnabled) {
int count = getComponentCount();
for (int i = 0; i < count; i++) {
Component comp = getComponent(i);
if (comp instanceof JInternalFrame ||
comp instanceof JInternalFrame.JDesktopIcon) {
componentOrderChanged = true;
break;
}
}
}
super.removeAll();
}
/**
* {@inheritDoc}
* @since 1.6
*/
public void setComponentZOrder(Component comp, int index) {
super.setComponentZOrder(comp, index);
if (componentOrderCheckingEnabled) {
if (comp instanceof JInternalFrame ||
comp instanceof JInternalFrame.JDesktopIcon) {
componentOrderChanged = true;
}
}
}
/**
* See readObject() and writeObject() in JComponent for more
* information about serialization in Swing.
*/
private void writeObject(ObjectOutputStream s) throws IOException {
s.defaultWriteObject();
if (getUIClassID().equals(uiClassID)) {
byte count = JComponent.getWriteObjCounter(this);
JComponent.setWriteObjCounter(this, --count);
if (count == 0 && ui != null) {
ui.installUI(this);
}
}
}
void setUIProperty(String propertyName, Object value) {
if (propertyName == "dragMode") {
if (!dragModeSet) {
setDragMode(((Integer)value).intValue());
dragModeSet = false;
}
} else {
super.setUIProperty(propertyName, value);
}
}
/**
* Returns a string representation of this <code>JDesktopPane</code>.
* This method is intended to be used only for debugging purposes, and the
* content and format of the returned string may vary between
* implementations. The returned string may be empty but may not
* be <code>null</code>.
*
* @return a string representation of this <code>JDesktopPane</code>
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