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Java(TM) 2 Platform, Standard Edition, v1.2.2 API Specification: Class JDialog - JDK 5 Documentation v1.2.2, Java 2 SDK 英文文档

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javax.swing
Class JDialog

java.lang.Object
  |
  +--java.awt.Component
        |
        +--java.awt.Container
              |
              +--java.awt.Window
                    |
                    +--java.awt.Dialog
                          |
                          +--javax.swing.JDialog

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public class JDialog

extends Dialog

implements WindowConstants, Accessible, RootPaneContainer

The main class for creating a dialog window. You can use this class to create a custom dialog, or invoke the many static methods in JOptionPane to create a variety of standard dialogs. The JDialog component contains a JRootPane as it's only child. The contentPane should be the parent of any children of the JDialog. From the older java.awt.Window object you would normally do something like this:

       dialog.add(child);
 

Using JDialog the proper semantic is:

       dialog.getContentPane().add(child);
 

The same priniciple holds true for setting layout managers, removing components, listing children, etc. All these methods should normally be sent to the contentPane instead of to the JDialog. The contentPane is always non-null. Attempting to set it to null generates an exception. The default contentPane has a BorderLayout manager set on it.

Please see the JRootPane documentation for a complete description of the contentPane, glassPane, and layeredPane components.

NOTE: For 1.1, Modal dialogs are currently constrained to only allow lightweight popup menus (JPopupMenu, JComboBox, JMenuBar) because of window ownership limitations in AWT1.1. This creates the further limitation of not being able to mix Swing popup components with AWT heavyweight components in a modal dialog since the heavyweight components would always overlap the lightweights, potentially obscuring the popup menu. (A heavyweight component uses a native-platform component (peer) component for its implementation -- AWT components are heavyweight components.)

For the keyboard keys used by this component in the standard Look and Feel (L&F) renditions, see the JDialog key assignments.

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. A future release of Swing will provide support for long term persistence.

See Also:

JOptionPane, JRootPane, Serialized Form

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Inner Class Summary
protected  class	JDialog.AccessibleJDialog           The class used to obtain the AccessibleRole for this object.

 

Field Summary
protected  AccessibleContext	accessibleContext
protected  JRootPane	rootPane
protected  boolean	rootPaneCheckingEnabled

 

Fields inherited from class java.awt.Component

BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, TOP_ALIGNMENT

 

Fields inherited from interface javax.swing.WindowConstants

DISPOSE_ON_CLOSE, DO_NOTHING_ON_CLOSE, HIDE_ON_CLOSE

 

Constructor Summary

JDialog()           Creates a non-modal dialog without a title and without a specified Frame owner.

JDialog(Dialog owner)           Creates a non-modal dialog without a title with the specifed Dialog as its owner.

JDialog(Dialog owner, boolean modal)           Creates a modal or non-modal dialog without a title and with the specified owner dialog.

JDialog(Dialog owner, String title)           Creates a non-modal dialog with the specified title and with the specified owner dialog.

JDialog(Dialog owner, String title, boolean modal)           Creates a modal or non-modal dialog with the specified title and the specified owner frame.

JDialog(Frame owner)           Creates a non-modal dialog without a title with the specifed Frame as its owner.

JDialog(Frame owner, boolean modal)           Creates a modal or non-modal dialog without a title and with the specified owner frame.

JDialog(Frame owner, String title)           Creates a non-modal dialog with the specified title and with the specified owner frame.

JDialog(Frame owner, String title, boolean modal)           Creates a modal or non-modal dialog with the specified title and the specified owner frame.

 

Method Summary
protected  void	addImpl(Component comp, Object constraints, int index)           By default, children may not be added directly to a this component, they must be added to its contentPane instead.
protected  JRootPane	createRootPane()           Called by the constructor methods to create the default rootPane.
protected  void	dialogInit()           Called by the constructors to init the JDialog properly.
AccessibleContext	getAccessibleContext()           Get the AccessibleContext associated with this JDialog
Container	getContentPane()           Returns the contentPane object for this dialog.
int	getDefaultCloseOperation()           Returns the operation which occurs when the user initiates a "close" on this dialog.
Component	getGlassPane()           Returns the glassPane object for this dialog.
JMenuBar	getJMenuBar()           Returns the menubar set on this dialog.
JLayeredPane	getLayeredPane()           Returns the layeredPane object for this dialog.
JRootPane	getRootPane()           Returns the rootPane object for this dialog.
protected  boolean	isRootPaneCheckingEnabled()
protected  String	paramString()           Returns a string representation of this JDialog.
protected  void	processKeyEvent(KeyEvent e)           Processes key events occurring on this component and, if appropriate, passes them on to components in the dialog which have registered interest in them.
protected  void	processWindowEvent(WindowEvent e)           Handles window events depending on the state of the defaultCloseOperation property.
void	remove(Component comp)           Removes the specified component from this container.
void	setContentPane(Container contentPane)           Sets the contentPane property.
void	setDefaultCloseOperation(int operation)           Sets the operation which will happen by default when the user initiates a "close" on this dialog.
void	setGlassPane(Component glassPane)           Sets the glassPane property.
void	setJMenuBar(JMenuBar menu)           Sets the menubar for this dialog.
void	setLayeredPane(JLayeredPane layeredPane)           Sets the layeredPane property.
void	setLayout(LayoutManager manager)           By default the layout of this component may not be set, the layout of its contentPane should be set instead.
void	setLocationRelativeTo(Component c)           Sets the location of the dialog relative to the specified component.
protected  void	setRootPane(JRootPane root)           Sets the rootPane property.
protected  void	setRootPaneCheckingEnabled(boolean enabled)           If true then calls to add() and setLayout() will cause an exception to be thrown.
void	update(Graphics g)           Just calls paint(g).

 

Methods inherited from class java.awt.Dialog

addNotify, dispose, getTitle, hide, isModal, isResizable, setModal, setResizable, setTitle, show

 

Methods inherited from class java.awt.Window

addWindowListener, applyResourceBundle, applyResourceBundle, finalize, getFocusOwner, getInputContext, getLocale, getOwnedWindows, getOwner, getToolkit, getWarningString, isShowing, pack, postEvent, processEvent, removeWindowListener, setCursor, toBack, toFront

 

Methods inherited from class java.awt.Container

add, add, add, add, add, addContainerListener, countComponents, deliverEvent, doLayout, findComponentAt, findComponentAt, getAlignmentX, getAlignmentY, getComponent, getComponentAt, getComponentAt, getComponentCount, getComponents, getInsets, getLayout, getMaximumSize, getMinimumSize, getPreferredSize, insets, invalidate, isAncestorOf, layout, list, list, locate, minimumSize, paint, paintComponents, preferredSize, print, printComponents, processContainerEvent, remove, removeAll, removeContainerListener, removeNotify, setFont, validate, validateTree

 

Methods inherited from class java.awt.Component

action, add, addComponentListener, addFocusListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, addPropertyChangeListener, addPropertyChangeListener, bounds, checkImage, checkImage, coalesceEvents, contains, contains, createImage, createImage, disable, disableEvents, dispatchEvent, enable, enable, enableEvents, enableInputMethods, firePropertyChange, getBackground, getBounds, getBounds, getColorModel, getComponentOrientation, getCursor, getDropTarget, getFont, getFontMetrics, getForeground, getGraphics, getHeight, getInputMethodRequests, getLocation, getLocation, getLocationOnScreen, getName, getParent, getPeer, getSize, getSize, getTreeLock, getWidth, getX, getY, gotFocus, handleEvent, hasFocus, imageUpdate, inside, isDisplayable, isDoubleBuffered, isEnabled, isFocusTraversable, isLightweight, isOpaque, isValid, isVisible, keyDown, keyUp, list, list, list, location, lostFocus, mouseDown, mouseDrag, mouseEnter, mouseExit, mouseMove, mouseUp, move, nextFocus, paintAll, prepareImage, prepareImage, printAll, processComponentEvent, processFocusEvent, processInputMethodEvent, processMouseEvent, processMouseMotionEvent, remove, removeComponentListener, removeFocusListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removePropertyChangeListener, removePropertyChangeListener, repaint, repaint, repaint, repaint, requestFocus, reshape, resize, resize, setBackground, setBounds, setBounds, setComponentOrientation, setDropTarget, setEnabled, setForeground, setLocale, setLocation, setLocation, setName, setSize, setSize, setVisible, show, size, toString, transferFocus

 

Methods inherited from class java.lang.Object

clone, equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

 

Field Detail

rootPane

protected JRootPane rootPane

See Also:

getRootPane(), setRootPane(javax.swing.JRootPane)

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rootPaneCheckingEnabled

protected boolean rootPaneCheckingEnabled

See Also:

isRootPaneCheckingEnabled(), setRootPaneCheckingEnabled(boolean)

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accessibleContext

protected AccessibleContext accessibleContext

Constructor Detail

JDialog

public JDialog()

Creates a non-modal dialog without a title and without a specified Frame owner. A shared, hidden frame will be set as the owner of the Dialog.

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JDialog

public JDialog(Frame owner)

Creates a non-modal dialog without a title with the specifed Frame as its owner.

Parameters:

owner - the Frame from which the dialog is displayed

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JDialog

public JDialog(Frame owner,
               boolean modal)

Creates a modal or non-modal dialog without a title and with the specified owner frame.

Parameters:

owner - the Frame from which the dialog is displayed

modal - true for a modal dialog, false for one that allows others windows to be active at the same time

---

JDialog

public JDialog(Frame owner,
               String title)

Creates a non-modal dialog with the specified title and with the specified owner frame.

Parameters:

owner - the Frame from which the dialog is displayed

title - the String to display in the dialog's title bar

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JDialog

public JDialog(Frame owner,
               String title,
               boolean modal)

Creates a modal or non-modal dialog with the specified title and the specified owner frame.

NOTE: Any popup components (JComboBox, JPopupMenu, JMenuBar) created within a modal dialog will be forced to be lightweight.

Parameters:

owner - the frame from which the dialog is displayed

title - the String to display in the dialog's title bar

modal - true for a modal dialog, false for one that allows others windows to be active at the same time

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JDialog

public JDialog(Dialog owner)

Creates a non-modal dialog without a title with the specifed Dialog as its owner.

Parameters:

owner - the Dialog from which the dialog is displayed

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JDialog

public JDialog(Dialog owner,
               boolean modal)

Creates a modal or non-modal dialog without a title and with the specified owner dialog.

Parameters:

owner - the Dialog from which the dialog is displayed

modal - true for a modal dialog, false for one that allows others windows to be active at the same time

---

JDialog

public JDialog(Dialog owner,
               String title)

Creates a non-modal dialog with the specified title and with the specified owner dialog.

Parameters:

owner - the Dialog from which the dialog is displayed

title - the String to display in the dialog's title bar

---

JDialog

public JDialog(Dialog owner,
               String title,
               boolean modal)

Creates a modal or non-modal dialog with the specified title and the specified owner frame.

Parameters:

owner - the dialog from which the dialog is displayed

title - the String to display in the dialog's title bar

modal - true for a modal dialog, false for one that allows others windows to be active at the same time

Method Detail

dialogInit

protected void dialogInit()

Called by the constructors to init the JDialog properly.

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createRootPane

protected JRootPane createRootPane()

Called by the constructor methods to create the default rootPane.

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processKeyEvent

protected void processKeyEvent(KeyEvent e)

Processes key events occurring on this component and, if appropriate, passes them on to components in the dialog which have registered interest in them.

Overrides:

processKeyEvent in class Component

Parameters:

e - the key event

See Also:

Component.processKeyEvent(java.awt.event.KeyEvent)

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processWindowEvent

protected void processWindowEvent(WindowEvent e)

Handles window events depending on the state of the defaultCloseOperation property.

Overrides:

processWindowEvent in class Window

See Also:

setDefaultCloseOperation(int)

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setDefaultCloseOperation

public void setDefaultCloseOperation(int operation)

Sets the operation which will happen by default when the user initiates a "close" on this dialog. The possible choices are:

• DO_NOTHING_ON_CLOSE - do not do anything - require the program to handle the operation in the windowClosing method of a registered WindowListener object.
• HIDE_ON_CLOSE - automatically hide the dialog after invoking any registered WindowListener objects
• DISPOSE_ON_CLOSE - automatically hide and dispose the dialog after invoking any registered WindowListener objects
• EXIT_ON_CLOSE - Exit the application by way of System.exit. Only use this in applications.

The value is set to HIDE_ON_CLOSE by default.

See Also:

Window.addWindowListener(java.awt.event.WindowListener), getDefaultCloseOperation()

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getDefaultCloseOperation

public int getDefaultCloseOperation()

Returns the operation which occurs when the user initiates a "close" on this dialog.

Returns:

an int indicating the window-close operation

See Also:

setDefaultCloseOperation(int)

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update

public void update(Graphics g)

Just calls paint(g). This method was overridden to prevent an unneccessary call to clear the background.

Overrides:

update in class Container

Tags copied from class: Container

Parameters:

g - the specified Graphics window

See Also:

Component.update(java.awt.Graphics)

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setJMenuBar

public void setJMenuBar(JMenuBar menu)

Sets the menubar for this dialog.

Parameters:

menubar - the menubar being placed in the dialog

See Also:

getJMenuBar()

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getJMenuBar

public JMenuBar getJMenuBar()

Returns the menubar set on this dialog.

See Also:

setJMenuBar(javax.swing.JMenuBar)

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isRootPaneCheckingEnabled

protected boolean isRootPaneCheckingEnabled()

Returns:

true if add and setLayout should be checked

See Also:

addImpl(java.awt.Component, java.lang.Object, int), setLayout(java.awt.LayoutManager), setRootPaneCheckingEnabled(boolean)

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setRootPaneCheckingEnabled

protected void setRootPaneCheckingEnabled(boolean enabled)

If true then calls to add() and setLayout() will cause an exception to be thrown.

See Also:

addImpl(java.awt.Component, java.lang.Object, int), setLayout(java.awt.LayoutManager), isRootPaneCheckingEnabled()

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addImpl

protected void addImpl(Component comp,
                       Object constraints,
                       int index)

By default, children may not be added directly to a this component, they must be added to its contentPane instead. For example:

 thisComponent.getContentPane().add(child)
 

An attempt to add to directly to this component will cause an runtime exception to be thrown. Subclasses can disable this behavior.

Overrides:

addImpl in class Container

Throws:

Error - if called with rootPaneChecking true

See Also:

setRootPaneCheckingEnabled(boolean)

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remove

public void remove(Component comp)

Removes the specified component from this container.

Overrides:

remove in class Container

Parameters:

comp - the component to be removed

See Also:

Container.add(java.awt.Component)

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setLayout

public void setLayout(LayoutManager manager)

By default the layout of this component may not be set, the layout of its contentPane should be set instead. For example:

 thisComponent.getContentPane().setLayout(new BorderLayout())
 

An attempt to set the layout of this component will cause an runtime exception to be thrown. Subclasses can disable this behavior.

Overrides:

setLayout in class Container

Throws:

Error - if called with rootPaneChecking true

See Also:

setRootPaneCheckingEnabled(boolean)

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getRootPane

public JRootPane getRootPane()

Returns the rootPane object for this dialog.

Specified by:

getRootPane in interface RootPaneContainer

See Also:

setRootPane(javax.swing.JRootPane), RootPaneContainer.getRootPane()

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setRootPane

protected void setRootPane(JRootPane root)

Sets the rootPane property. This method is called by the constructor.

Parameters:

root - the rootPane object for this dialog

See Also:

getRootPane()

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getContentPane

public Container getContentPane()

Returns the contentPane object for this dialog.

Specified by:

getContentPane in interface RootPaneContainer

See Also:

setContentPane(java.awt.Container), RootPaneContainer.getContentPane()

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setContentPane

public void setContentPane(Container contentPane)

Sets the contentPane property. This method is called by the constructor.

Specified by:

setContentPane in interface RootPaneContainer

Parameters:

contentPane - the contentPane object for this dialog

Throws:

IllegalComponentStateException - (a runtime exception) if the content pane parameter is null

See Also:

getContentPane(), RootPaneContainer.setContentPane(java.awt.Container)

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getLayeredPane

public JLayeredPane getLayeredPane()

Returns the layeredPane object for this dialog.

Specified by:

getLayeredPane in interface RootPaneContainer

See Also:

setLayeredPane(javax.swing.JLayeredPane), RootPaneContainer.getLayeredPane()

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setLayeredPane

public void setLayeredPane(JLayeredPane layeredPane)

Sets the layeredPane property. This method is called by the constructor.

Specified by:

setLayeredPane in interface RootPaneContainer

Parameters:

layeredPane - the layeredPane object for this dialog

Throws:

IllegalComponentStateException - (a runtime exception) if the layered pane parameter is null

See Also:

getLayeredPane(), RootPaneContainer.setLayeredPane(javax.swing.JLayeredPane)

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getGlassPane

public Component getGlassPane()

Returns the glassPane object for this dialog.

Specified by:

getGlassPane in interface RootPaneContainer

See Also:

setGlassPane(java.awt.Component), RootPaneContainer.getGlassPane()

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setGlassPane

public void setGlassPane(Component glassPane)

Sets the glassPane property. This method is called by the constructor.

Specified by:

setGlassPane in interface RootPaneContainer

Parameters:

glassPane - the glassPane object for this dialog

See Also:

getGlassPane(), RootPaneContainer.setGlassPane(java.awt.Component)

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setLocationRelativeTo

public void setLocationRelativeTo(Component c)

Sets the location of the dialog relative to the specified component. If the component is not currently showing, the dialog is centered on the screen.

Parameters:

c - the component in relation to which the dialog's location is determined

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paramString

protected String paramString()

Returns a string representation of this JDialog. 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 Dialog

Returns:

a string representation of this JDialog.

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getAccessibleContext

public AccessibleContext getAccessibleContext()

Get the AccessibleContext associated with this JDialog

Specified by:

getAccessibleContext in interface Accessible

Returns:

the AccessibleContext of this JDialog

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