JDesktopPane (Java 2 Platform SE 5.0) - JDK 5 Documentation v1.5.0, Java 2 SDK 英文文档

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Java^TM 2 Platform
Standard Ed. 5.0

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javax.swing
Class JDesktopPane

java.lang.Object
  java.awt.Component
      java.awt.Container
          javax.swing.JComponent
              javax.swing.JLayeredPane
                  javax.swing.JDesktopPane

All Implemented Interfaces:: ImageObserver, MenuContainer, Serializable, Accessible

public class JDesktopPane
extends JLayeredPane
implements Accessible
extends JLayeredPane
implements Accessible

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: 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^TM has been added to the java.beans package. Please see XMLEncoder.

See Also:: JInternalFrame, JInternalFrame.JDesktopIcon, DesktopManager

Nested Class Summary
`protected class`	`JDesktopPane.AccessibleJDesktopPane` This class implements accessibility support for the `JDesktopPane` class.

Nested classes/interfaces inherited from class javax.swing.JLayeredPane
`JLayeredPane.AccessibleJLayeredPane`

Nested classes/interfaces inherited from class javax.swing.JComponent
`JComponent.AccessibleJComponent`

Nested classes/interfaces inherited from class java.awt.Container
`Container.AccessibleAWTContainer`

Nested classes/interfaces inherited from class java.awt.Component
`Component.AccessibleAWTComponent, Component.BltBufferStrategy, Component.FlipBufferStrategy`

Field Summary
`static int`	`LIVE_DRAG_MODE` Indicates that the entire contents of the item being dragged should appear inside the desktop pane.
`static int`	`OUTLINE_DRAG_MODE` Indicates that an outline only of the item being dragged should appear inside the desktop pane.

Fields inherited from class javax.swing.JLayeredPane
`DEFAULT_LAYER, DRAG_LAYER, FRAME_CONTENT_LAYER, LAYER_PROPERTY, MODAL_LAYER, PALETTE_LAYER, POPUP_LAYER`

Fields inherited from class javax.swing.JComponent
`accessibleContext, listenerList, TOOL_TIP_TEXT_KEY, ui, UNDEFINED_CONDITION, WHEN_ANCESTOR_OF_FOCUSED_COMPONENT, WHEN_FOCUSED, WHEN_IN_FOCUSED_WINDOW`

Fields inherited from class java.awt.Component
`BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, TOP_ALIGNMENT`

Fields inherited from interface java.awt.image.ImageObserver
`ABORT, ALLBITS, ERROR, FRAMEBITS, HEIGHT, PROPERTIES, SOMEBITS, WIDTH`

Constructor Summary
`JDesktopPane()` Creates a new `JDesktopPane`.

Method Summary
`AccessibleContext`	`getAccessibleContext()` Gets the `AccessibleContext` associated with this `JDesktopPane`.
`JInternalFrame[]`	`getAllFrames()` Returns all `JInternalFrames` currently displayed in the desktop.
`JInternalFrame[]`	`getAllFramesInLayer(int layer)` Returns all `JInternalFrames` currently displayed in the specified layer of the desktop.
`DesktopManager`	`getDesktopManager()` Returns the `DesktopManger` that handles desktop-specific UI actions.
`int`	`getDragMode()` Gets the current "dragging style" used by the desktop pane.
`JInternalFrame`	`getSelectedFrame()` Returns the currently active `JInternalFrame` in this `JDesktopPane`, or `null` if no `JInternalFrame` is currently active.
`DesktopPaneUI`	`getUI()` Returns the L&F object that renders this component.
`String`	`getUIClassID()` Returns the name of the L&F class that renders this component.
`boolean`	`isOpaque()` Returns true to indicate that this component paints every pixel in its range.
`protected String`	`paramString()` Returns a string representation of this `JDesktopPane`.
`void`	`setDesktopManager(DesktopManager d)` Sets the `DesktopManger` that will handle desktop-specific UI actions.
`void`	`setDragMode(int dragMode)` Sets the "dragging style" used by the desktop pane.
`void`	`setSelectedFrame(JInternalFrame f)` Sets the currently active `JInternalFrame` in this `JDesktopPane`.
`void`	`setUI(DesktopPaneUI ui)` Sets the L&F object that renders this component.
`void`	`updateUI()` Notification from the `UIManager` that the L&F has changed.

Methods inherited from class javax.swing.JLayeredPane
`addImpl, getComponentCountInLayer, getComponentsInLayer, getComponentToLayer, getIndexOf, getLayer, getLayer, getLayeredPaneAbove, getObjectForLayer, getPosition, highestLayer, insertIndexForLayer, isOptimizedDrawingEnabled, lowestLayer, moveToBack, moveToFront, paint, putLayer, remove, removeAll, setLayer, setLayer, setPosition`

Methods inherited from class javax.swing.JComponent
addAncestorListener, addNotify, addVetoableChangeListener, computeVisibleRect, contains, createToolTip, disable, enable, firePropertyChange, firePropertyChange, firePropertyChange, fireVetoableChange, getActionForKeyStroke, getActionMap, getAlignmentX, getAlignmentY, getAncestorListeners, getAutoscrolls, getBorder, getBounds, getClientProperty, getComponentGraphics, getComponentPopupMenu, getConditionForKeyStroke, getDebugGraphicsOptions, getDefaultLocale, getFontMetrics, getGraphics, getHeight, getInheritsPopupMenu, getInputMap, getInputMap, getInputVerifier, getInsets, getInsets, getListeners, getLocation, getMaximumSize, getMinimumSize, getNextFocusableComponent, getPopupLocation, getPreferredSize, getRegisteredKeyStrokes, getRootPane, getSize, getToolTipLocation, getToolTipText, getToolTipText, getTopLevelAncestor, getTransferHandler, getVerifyInputWhenFocusTarget, getVetoableChangeListeners, getVisibleRect, getWidth, getX, getY, grabFocus, isDoubleBuffered, isLightweightComponent, isManagingFocus, isPaintingTile, isRequestFocusEnabled, isValidateRoot, paintBorder, paintChildren, paintComponent, paintImmediately, paintImmediately, print, printAll, printBorder, printChildren, printComponent, processComponentKeyEvent, processKeyBinding, processKeyEvent, processMouseEvent, processMouseMotionEvent, putClientProperty, registerKeyboardAction, registerKeyboardAction, removeAncestorListener, removeNotify, removeVetoableChangeListener, repaint, repaint, requestDefaultFocus, requestFocus, requestFocus, requestFocusInWindow, requestFocusInWindow, resetKeyboardActions, reshape, revalidate, scrollRectToVisible, setActionMap, setAlignmentX, setAlignmentY, setAutoscrolls, setBackground, setBorder, setComponentPopupMenu, setDebugGraphicsOptions, setDefaultLocale, setDoubleBuffered, setEnabled, setFocusTraversalKeys, setFont, setForeground, setInheritsPopupMenu, setInputMap, setInputVerifier, setMaximumSize, setMinimumSize, setNextFocusableComponent, setOpaque, setPreferredSize, setRequestFocusEnabled, setToolTipText, setTransferHandler, setUI, setVerifyInputWhenFocusTarget, setVisible, unregisterKeyboardAction, update

Methods inherited from class java.awt.Container
add, add, add, add, add, addContainerListener, addPropertyChangeListener, addPropertyChangeListener, applyComponentOrientation, areFocusTraversalKeysSet, countComponents, deliverEvent, doLayout, findComponentAt, findComponentAt, getComponent, getComponentAt, getComponentAt, getComponentCount, getComponents, getComponentZOrder, getContainerListeners, getFocusTraversalKeys, getFocusTraversalPolicy, getLayout, getMousePosition, insets, invalidate, isAncestorOf, isFocusCycleRoot, isFocusCycleRoot, isFocusTraversalPolicyProvider, isFocusTraversalPolicySet, layout, list, list, locate, minimumSize, paintComponents, preferredSize, printComponents, processContainerEvent, processEvent, remove, removeContainerListener, setComponentZOrder, setFocusCycleRoot, setFocusTraversalPolicy, setFocusTraversalPolicyProvider, setLayout, transferFocusBackward, transferFocusDownCycle, validate, validateTree

Methods inherited from class java.awt.Component
action, add, addComponentListener, addFocusListener, addHierarchyBoundsListener, addHierarchyListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, addMouseWheelListener, bounds, checkImage, checkImage, coalesceEvents, contains, createImage, createImage, createVolatileImage, createVolatileImage, disableEvents, dispatchEvent, enable, enableEvents, enableInputMethods, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, getBackground, getBounds, getColorModel, getComponentListeners, getComponentOrientation, getCursor, getDropTarget, getFocusCycleRootAncestor, getFocusListeners, getFocusTraversalKeysEnabled, getFont, getForeground, getGraphicsConfiguration, getHierarchyBoundsListeners, getHierarchyListeners, getIgnoreRepaint, getInputContext, getInputMethodListeners, getInputMethodRequests, getKeyListeners, getLocale, getLocation, getLocationOnScreen, getMouseListeners, getMouseMotionListeners, getMousePosition, getMouseWheelListeners, getName, getParent, getPeer, getPropertyChangeListeners, getPropertyChangeListeners, getSize, getToolkit, getTreeLock, gotFocus, handleEvent, hasFocus, hide, imageUpdate, inside, isBackgroundSet, isCursorSet, isDisplayable, isEnabled, isFocusable, isFocusOwner, isFocusTraversable, isFontSet, isForegroundSet, isLightweight, isMaximumSizeSet, isMinimumSizeSet, isPreferredSizeSet, isShowing, isValid, isVisible, keyDown, keyUp, list, list, list, location, lostFocus, mouseDown, mouseDrag, mouseEnter, mouseExit, mouseMove, mouseUp, move, nextFocus, paintAll, postEvent, prepareImage, prepareImage, processComponentEvent, processFocusEvent, processHierarchyBoundsEvent, processHierarchyEvent, processInputMethodEvent, processMouseWheelEvent, remove, removeComponentListener, removeFocusListener, removeHierarchyBoundsListener, removeHierarchyListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removeMouseWheelListener, removePropertyChangeListener, removePropertyChangeListener, repaint, repaint, repaint, resize, resize, setBounds, setBounds, setComponentOrientation, setCursor, setDropTarget, setFocusable, setFocusTraversalKeysEnabled, setIgnoreRepaint, setLocale, setLocation, setLocation, setName, setSize, setSize, show, show, size, toString, transferFocus, transferFocusUpCycle

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Field Detail

LIVE_DRAG_MODE

public static final int LIVE_DRAG_MODE

Indicates that the entire contents of the item being dragged should appear inside the desktop pane.

See Also:: OUTLINE_DRAG_MODE, setDragMode(int), Constant Field Values

OUTLINE_DRAG_MODE

public static final int OUTLINE_DRAG_MODE

Indicates that an outline only of the item being dragged should appear inside the desktop pane.

See Also:: LIVE_DRAG_MODE, setDragMode(int), Constant Field Values

Constructor Detail

JDesktopPane

public JDesktopPane()

Creates a new JDesktopPane.

Method Detail

getUI

public DesktopPaneUI getUI()

Returns the L&F object that renders this component.

Returns:: the DesktopPaneUI object that renders this component

setUI

public void setUI(DesktopPaneUI ui)

Sets the L&F object that renders this component.

Parameters:: ui - the DesktopPaneUI L&F object
See Also:: UIDefaults.getUI(javax.swing.JComponent)

setDragMode

public void setDragMode(int dragMode)

Sets the "dragging style" used by the desktop pane. You may want to change to one mode or another for performance or aesthetic reasons.

Parameters:: dragMode - the style of drag to use for items in the Desktop
See Also:: LIVE_DRAG_MODE, OUTLINE_DRAG_MODE

getDragMode

public int getDragMode()

Gets the current "dragging style" used by the desktop pane.

Returns:: either Live_DRAG_MODE or OUTLINE_DRAG_MODE
See Also:: setDragMode(int)

getDesktopManager

public DesktopManager getDesktopManager()

Returns the DesktopManger that handles desktop-specific UI actions.

setDesktopManager

public void setDesktopManager(DesktopManager d)

Sets the DesktopManger that will handle desktop-specific UI actions.

Parameters:: d - the DesktopManager to use

updateUI

public void updateUI()

Notification from the UIManager that the L&F has changed. Replaces the current UI object with the latest version from the UIManager.

Overrides:: updateUI in class JComponent

See Also:: JComponent.updateUI()

getUIClassID

public String getUIClassID()

Returns the name of the L&F class that renders this component.

Overrides:: getUIClassID in class JComponent

Returns:: the string "DesktopPaneUI"
See Also:: JComponent.getUIClassID(), UIDefaults.getUI(javax.swing.JComponent)

getAllFrames

public JInternalFrame[] getAllFrames()

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

Returns:: an array of JInternalFrame objects

getSelectedFrame

public JInternalFrame getSelectedFrame()

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

setSelectedFrame

public void setSelectedFrame(JInternalFrame f)

Sets the currently active JInternalFrame in this JDesktopPane.

Parameters:: f - the internal frame that's currently selected
Since:: 1.3

getAllFramesInLayer

public JInternalFrame[] getAllFramesInLayer(int layer)

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

Parameters:: layer - an int specifying the desktop layer
Returns:: an array of JInternalFrame objects
See Also:: JLayeredPane

isOpaque

public boolean isOpaque()

Returns true to indicate that this component paints every pixel in its range. (In other words, it does not have a transparent background or foreground.)

Overrides:: isOpaque in class JComponent

Returns:: true
See Also:: JComponent.isOpaque()

paramString

protected String paramString()

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.

Overrides:: paramString in class JLayeredPane

Returns:: a string representation of this JDesktopPane

getAccessibleContext

public AccessibleContext getAccessibleContext()

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.

Specified by:: getAccessibleContext in interface Accessible
Overrides:: getAccessibleContext in class JLayeredPane

Returns:: an AccessibleJDesktopPane that serves as the AccessibleContext of this JDesktopPane