https://openjdk.java.net/ 
/*
 * Copyright (c) 1997, 2020, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * 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.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * questions.
 */
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.beans.JavaBean;
import java.beans.BeanProperty;
import java.io.ObjectOutputStream;
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 JInternalFrame objects and add them to the
JDesktopPane. JDesktopPane extends
JLayeredPane to manage the potentially overlapping internal
frames. It also maintains a reference to an instance of
DesktopManager that is set by the UI
class for the current look and feel (L&F).  Note that JDesktopPane
does not support borders.


This class is normally used as the parent of JInternalFrames
to provide a pluggable DesktopManager object to the
JInternalFrames. The installUI of the
L&F specific implementation is responsible for setting the
desktopManager variable appropriately.
When the parent of a JInternalFrame is a JDesktopPane,
it should delegate most of its behavior to the desktopManager
(closing, resizing, etc).


For further documentation and examples see
How to Use Internal Frames,
a section in The Java Tutorial.


Warning: Swing is not thread safe. For more
information see Swing's Threading
Policy.


Warning:
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 java.beans package. Please see XMLEncoder. 
Author:David Kloba
See Also:
Since:1.2
/**
 * 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&amp;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&amp;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
 * @since 1.2
 */
@JavaBean(defaultProperty = "UI")
@SuppressWarnings("serial") // Same-version serialization only
public class JDesktopPane extends JLayeredPane implements Accessible
{
    
See Also:
/**
     * @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 Also:
/**
      * 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 Also:
/**
      * 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 JDesktopPane.

/**
     * 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.

Returns:the DesktopPaneUI object that
  renders this component
/**
     * Returns the L&amp;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.

Params:
  • ui –  the DesktopPaneUI L&F object
See Also:
/**
     * Sets the L&amp;F object that renders this component.
     *
     * @param ui  the DesktopPaneUI L&amp;F object
     * @see UIDefaults#getUI
     */
    @BeanProperty(hidden = true, 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.

Params:
  • dragMode – the style of drag to use for items in the Desktop
See Also:
Since:1.3
/**
     * 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
     *
     * @since 1.3
     */
    @BeanProperty(enumerationValues = {
            "JDesktopPane.LIVE_DRAG_MODE",
            "JDesktopPane.OUTLINE_DRAG_MODE"}, description
            = "Dragging style for internal frame children.")
    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.

See Also:
Returns:either Live_DRAG_MODE or
  OUTLINE_DRAG_MODE
Since:1.3
/**
     * 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 DesktopManger that handles desktop-specific UI actions. 
Returns:the DesktopManger that handles desktop-specific UI actions
/**
     * Returns the {@code DesktopManger} that handles
     * desktop-specific UI actions.
     *
     * @return the {@code DesktopManger} that handles desktop-specific
     *         UI actions
     */
    public DesktopManager getDesktopManager() {
        return desktopManager;
    }

    
Sets the DesktopManger that will handle desktop-specific UI actions. This may be overridden by LookAndFeel. 
Params:
  • d – the DesktopManager to use
/**
     * 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
     */
    @BeanProperty(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 UIManager that the L&F has changed.
Replaces the current UI object with the latest version from the
UIManager.

See Also:
  • updateUI.updateUI
/**
     * Notification from the <code>UIManager</code> that the L&amp;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.

See Also:
Returns:the string "DesktopPaneUI"
/**
     * Returns the name of the L&amp;F class that renders this component.
     *
     * @return the string "DesktopPaneUI"
     * @see JComponent#getUIClassID
     * @see UIDefaults#getUI
     */
    @BeanProperty(bound = false)
    public String getUIClassID() {
        return uiClassID;
    }

    
Returns all JInternalFrames currently displayed in the
desktop. Returns iconified frames as well as expanded frames.

Returns:an array of JInternalFrame objects
/**
     * 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
     */
    @BeanProperty(bound = false)
    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 JInternalFrame
in this JDesktopPane, or null
if no JInternalFrame is currently active.

Returns:the currently active JInternalFrame or
  null
Since:1.3
/** 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 JInternalFrame
 in this JDesktopPane. 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)

Params:
  • f – the internal frame that's currently selected
Since:1.3
/** 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 JInternalFrames currently displayed in the
specified layer of the desktop. Returns iconified frames as well
expanded frames.

Params:
  • layer –  an int specifying the desktop layer
See Also:
Returns:an array of JInternalFrame objects
/**
     * 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}

/**
     * {@inheritDoc}
     */
    @Override
    public void remove(Component comp) {
        super.remove(comp);
        updateFramesCache();
    }

    
Selects the next JInternalFrame in this desktop pane.

Params:
  • forward – a boolean indicating which direction to select in;
       true for forward, false for
       backward
Returns:the JInternalFrame that was selected or null
        if nothing was selected
Since:1.6
/**
     * 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
/**
     * {@inheritDoc}
     * @since 1.6
     */
    protected void addImpl(Component comp, Object constraints, int index) {
        checkComponentAttributes(comp);
        super.addImpl(comp, constraints, index);
        if (componentOrderCheckingEnabled) {
            if (comp instanceof JInternalFrame ||
                comp instanceof JInternalFrame.JDesktopIcon) {
                componentOrderChanged = true;
            }
        }
    }

    private void checkComponentAttributes(Component comp) {
        if (comp instanceof JInternalFrame && ((JInternalFrame) comp).isIcon()) {
            ((JInternalFrame) comp).putClientProperty("wasIconOnce", Boolean.FALSE);
        }
    }

    
{@inheritDoc}

Since:1.6
/**
     * {@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
/**
     * {@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
/**
     * {@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.

/**
     * 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 JDesktopPane.
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 null.

Returns: a string representation of this JDesktopPane
/**
     * 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>
     */
    protected String paramString() {
        String desktopManagerString = (desktopManager != null ?
                                       desktopManager.toString() : "");

        return super.paramString() +
        ",desktopManager=" + desktopManagerString;
    }

/////////////////
// Accessibility support
////////////////

    
Gets the AccessibleContext associated with this
JDesktopPane. For desktop panes, the
AccessibleContext takes the form of an
AccessibleJDesktopPane.
A new AccessibleJDesktopPane instance is created if necessary.

Returns:an AccessibleJDesktopPane that serves as the
        AccessibleContext of this JDesktopPane
/**
     * Gets the <code>AccessibleContext</code> associated with this
     * <code>JDesktopPane</code>. For desktop panes, the
     * <code>AccessibleContext</code> takes the form of an
     * <code>AccessibleJDesktopPane</code>.
     * A new <code>AccessibleJDesktopPane</code> instance is created if necessary.
     *
     * @return an <code>AccessibleJDesktopPane</code> that serves as the
     *         <code>AccessibleContext</code> of this <code>JDesktopPane</code>
     */
    @BeanProperty(bound = false)
    public AccessibleContext getAccessibleContext() {
        if (accessibleContext == null) {
            accessibleContext = new AccessibleJDesktopPane();
        }
        return accessibleContext;
    }

    
This class implements accessibility support for the
JDesktopPane class.  It provides an implementation of the
Java Accessibility API appropriate to desktop pane user-interface
elements.


Warning:
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 java.beans package. Please see XMLEncoder. 
/**
     * This class implements accessibility support for the
     * <code>JDesktopPane</code> class.  It provides an implementation of the
     * Java Accessibility API appropriate to desktop pane user-interface
     * elements.
     * <p>
     * <strong>Warning:</strong>
     * Serialized objects of this class will not be compatible with
     * future Swing releases. The current serialization support is
     * appropriate for short term storage or RMI between applications running
     * the same version of Swing.  As of 1.4, support for long term storage
     * of all JavaBeans
     * has been added to the <code>java.beans</code> package.
     * Please see {@link java.beans.XMLEncoder}.
     */
    @SuppressWarnings("serial") // Same-version serialization only
    protected class AccessibleJDesktopPane extends AccessibleJComponent {

        
Constructs an AccessibleJDesktopPane. 
/**
         * Constructs an {@code AccessibleJDesktopPane}.
         */
        protected AccessibleJDesktopPane() {}

        
Get the role of this object.

See Also:
Returns:an instance of AccessibleRole describing the role of the
object
/**
         * Get the role of this object.
         *
         * @return an instance of AccessibleRole describing the role of the
         * object
         * @see AccessibleRole
         */
        public AccessibleRole getAccessibleRole() {
            return AccessibleRole.DESKTOP_PANE;
        }
    }
}