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Dialog (Java 2 Platform SE v1.4.1) - JDK 5 Documentation v1.4.1, Java 2 SDK 英文文档

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JavaTM 2 Platform
Std. Ed. v1.4.1
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java.awt
Class Dialog

java.lang.Object
  |
  +--java.awt.Component
        |
        +--java.awt.Container
              |
              +--java.awt.Window
                    |
                    +--java.awt.Dialog
All Implemented Interfaces:
Accessible, ImageObserver, MenuContainer, Serializable
Direct Known Subclasses:
FileDialog, JDialog
public class Dialog
extends Window

A Dialog is a top-level window with a title and a border that is typically used to take some form of input from the user. The size of the dialog includes any area designated for the border. The dimensions of the border area can be obtained using the getInsets method, however, since these dimensions are platform-dependent, a valid insets value cannot be obtained until the dialog is made displayable by either calling pack or show. Since the border area is included in the overall size of the dialog, the border effectively obscures a portion of the dialog, constraining the area available for rendering and/or displaying subcomponents to the rectangle which has an upper-left corner location of (insets.left, insets.top), and has a size of width - (insets.left + insets.right) by height - (insets.top + insets.bottom).

The default layout for a dialog is BorderLayout.

A dialog may have its native decorations (i.e. Frame & Titlebar) turned off with setUndecorated. This can only be done while the dialog is not displayable.

A dialog must have either a frame or another dialog defined as its owner when it's constructed. When the owner window of a visible dialog is minimized, the dialog will automatically be hidden from the user. When the owner window is subsequently restored, the dialog is made visible to the user again.

In a multi-screen environment, you can create a Dialog on a different screen device than its owner. See Frame for more information.

A dialog can be either modeless (the default) or modal. A modal dialog is one which blocks input to all other toplevel windows in the application, except for any windows created with the dialog as their owner.

Dialogs are capable of generating the following WindowEvents: WindowOpened, WindowClosing, WindowClosed, WindowActivated, WindowDeactivated, WindowGainedFocus, WindowLostFocus.

Since:
JDK1.0
See Also:
WindowEvent, Window.addWindowListener(java.awt.event.WindowListener), Serialized Form

Nested Class Summary
protected  class Dialog.AccessibleAWTDialog
          This class implements accessibility support for the Dialog class.
 
Nested classes inherited from class java.awt.Window
 
Nested classes inherited from class java.awt.Container
 
Nested classes inherited from class java.awt.Component
Component.BltBufferStrategy, Component.FlipBufferStrategy
 
Field Summary
 
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
Dialog(Dialog owner)
          Constructs an initially invisible, non-modal Dialog with an empty title and the specified owner dialog.
Dialog(Dialog owner, String title)
          Constructs an initially invisible, non-modal Dialog with the specified owner dialog and title.
Dialog(Dialog owner, String title, boolean modal)
          Constructs an initially invisible Dialog with the specified owner dialog, title, and modality.
Dialog(Dialog owner, String title, boolean modal, GraphicsConfiguration gc)
          Constructs an initially invisible Dialog with the specified owner dialog, title, modality, and GraphicsConfiguration.
Dialog(Frame owner)
          Constructs an initially invisible, non-modal Dialog with an empty title and the specified owner frame.
Dialog(Frame owner, boolean modal)
          Constructs an initially invisible Dialog with an empty title, the specified owner frame and modality.
Dialog(Frame owner, String title)
          Constructs an initially invisible, non-modal Dialog with the specified owner frame and title.
Dialog(Frame owner, String title, boolean modal)
          Constructs an initially invisible Dialog with the specified owner frame, title, and modality.
Dialog(Frame owner, String title, boolean modal, GraphicsConfiguration gc)
          Constructs an initially invisible Dialog with the specified owner frame, title, modality, and GraphicsConfiguration.
 
Method Summary
 void addNotify()
          Makes this Dialog displayable by connecting it to a native screen resource.
 void dispose()
          Disposes the Dialog and then causes show() to return if it is currently blocked.
 AccessibleContext getAccessibleContext()
          Gets the AccessibleContext associated with this Dialog.
 String getTitle()
          Gets the title of the dialog.
 void hide()
          Hides the Dialog and then causes show() to return if it is currently blocked.
 boolean isModal()
          Indicates whether the dialog is modal.
 boolean isResizable()
          Indicates whether this dialog is resizable by the user.
 boolean isUndecorated()
          Indicates whether this dialog is undecorated.
protected  String paramString()
          Returns a string representing the state of this dialog.
 void setModal(boolean b)
          Specifies whether this dialog should be modal.
 void setResizable(boolean resizable)
          Sets whether this dialog is resizable by the user.
 void setTitle(String title)
          Sets the title of the Dialog.
 void setUndecorated(boolean undecorated)
          Disables or enables decorations for this dialog.
 void show()
          Makes the Dialog visible.
 
Methods inherited from class java.awt.Window
addPropertyChangeListener, addPropertyChangeListener, addWindowFocusListener, addWindowListener, addWindowStateListener, applyResourceBundle, applyResourceBundle, createBufferStrategy, createBufferStrategy, finalize, getBufferStrategy, getFocusableWindowState, getFocusCycleRootAncestor, getFocusOwner, getFocusTraversalKeys, getGraphicsConfiguration, getInputContext, getListeners, getLocale, getMostRecentFocusOwner, getOwnedWindows, getOwner, getToolkit, getWarningString, getWindowFocusListeners, getWindowListeners, getWindowStateListeners, isActive, isFocusableWindow, isFocusCycleRoot, isFocused, isShowing, pack, postEvent, processEvent, processWindowEvent, processWindowFocusEvent, processWindowStateEvent, removeWindowFocusListener, removeWindowListener, removeWindowStateListener, setCursor, setFocusableWindowState, setFocusCycleRoot, setLocationRelativeTo, toBack, toFront
 
Methods inherited from class java.awt.Container
add, add, add, add, add, addContainerListener, addImpl, applyComponentOrientation, areFocusTraversalKeysSet, countComponents, deliverEvent, doLayout, findComponentAt, findComponentAt, getAlignmentX, getAlignmentY, getComponent, getComponentAt, getComponentAt, getComponentCount, getComponents, getContainerListeners, getFocusTraversalPolicy, getInsets, getLayout, getMaximumSize, getMinimumSize, getPreferredSize, insets, invalidate, isAncestorOf, isFocusCycleRoot, isFocusTraversalPolicySet, layout, list, list, locate, minimumSize, paint, paintComponents, preferredSize, print, printComponents, processContainerEvent, remove, remove, removeAll, removeContainerListener, removeNotify, setFocusTraversalKeys, setFocusTraversalPolicy, setFont, setLayout, transferFocusBackward, transferFocusDownCycle, update, 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, contains, createImage, createImage, createVolatileImage, createVolatileImage, disable, disableEvents, dispatchEvent, enable, enable, enableEvents, enableInputMethods, firePropertyChange, firePropertyChange, firePropertyChange, getBackground, getBounds, getBounds, getColorModel, getComponentListeners, getComponentOrientation, getCursor, getDropTarget, getFocusListeners, getFocusTraversalKeysEnabled, getFont, getFontMetrics, getForeground, getGraphics, getHeight, getHierarchyBoundsListeners, getHierarchyListeners, getIgnoreRepaint, getInputMethodListeners, getInputMethodRequests, getKeyListeners, getLocation, getLocation, getLocationOnScreen, getMouseListeners, getMouseMotionListeners, getMouseWheelListeners, getName, getParent, getPeer, getPropertyChangeListeners, getPropertyChangeListeners, getSize, getSize, getTreeLock, getWidth, getX, getY, gotFocus, handleEvent, hasFocus, imageUpdate, inside, isBackgroundSet, isCursorSet, isDisplayable, isDoubleBuffered, isEnabled, isFocusable, isFocusOwner, isFocusTraversable, isFontSet, isForegroundSet, 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, processHierarchyBoundsEvent, processHierarchyEvent, processInputMethodEvent, processKeyEvent, processMouseEvent, processMouseMotionEvent, processMouseWheelEvent, remove, removeComponentListener, removeFocusListener, removeHierarchyBoundsListener, removeHierarchyListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removeMouseWheelListener, removePropertyChangeListener, removePropertyChangeListener, repaint, repaint, repaint, repaint, requestFocus, requestFocus, requestFocusInWindow, requestFocusInWindow, reshape, resize, resize, setBackground, setBounds, setBounds, setComponentOrientation, setDropTarget, setEnabled, setFocusable, setFocusTraversalKeysEnabled, setForeground, setIgnoreRepaint, setLocale, setLocation, setLocation, setName, setSize, setSize, setVisible, show, size, toString, transferFocus, transferFocusUpCycle
 
Methods inherited from class java.lang.Object
clone, equals, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Constructor Detail

Dialog

public Dialog(Frame owner)
Constructs an initially invisible, non-modal Dialog with an empty title and the specified owner frame.

Parameters:
owner - the owner of the dialog
Throws:
IllegalArgumentException - if the owner's GraphicsConfiguration is not from a screen device
IllegalArgumentException - if owner is null; this exception is always thrown when GraphicsEnvironment.isHeadless returns true
See Also:
GraphicsEnvironment.isHeadless(), Component.setSize(int, int), Component.setVisible(boolean)

Dialog

public Dialog(Frame owner,
              boolean modal)
Constructs an initially invisible Dialog with an empty title, the specified owner frame and modality.

Parameters:
owner - the owner of the dialog
modal - if true, dialog blocks input to other app windows when shown
Throws:
IllegalArgumentException - if the owner's GraphicsConfiguration is not from a screen device
IllegalArgumentException - if owner is null; this exception is always thrown when GraphicsEnvironment.isHeadless returns true
See Also:
GraphicsEnvironment.isHeadless()

Dialog

public Dialog(Frame owner,
              String title)
Constructs an initially invisible, non-modal Dialog with the specified owner frame and title.

Parameters:
owner - the owner of the dialog
title - the title of the dialog; a null value will be accepted without causing a NullPointerException to be thrown
Throws:
IllegalArgumentException - if the owner's GraphicsConfiguration is not from a screen device
IllegalArgumentException - if owner is null; this exception is always thrown when GraphicsEnvironment.isHeadless returns true
See Also:
GraphicsEnvironment.isHeadless(), Component.setSize(int, int), Component.setVisible(boolean)

Dialog

public Dialog(Frame owner,
              String title,
              boolean modal)
Constructs an initially invisible Dialog with the specified owner frame, title, and modality.

Parameters:
owner - the owner of the dialog
title - the title of the dialog; a null value will be accepted without causing a NullPointerException to be thrown
modal - if true, dialog blocks input to other app windows when shown
Throws:
IllegalArgumentException - if the owner's GraphicsConfiguration is not from a screen device
IllegalArgumentException - if owner is null. This exception is always thrown when GraphicsEnvironment.isHeadless returns true
See Also:
GraphicsEnvironment.isHeadless(), Component.setSize(int, int), Component.setVisible(boolean)

Dialog

public Dialog(Frame owner,
              String title,
              boolean modal,
              GraphicsConfiguration gc)
Constructs an initially invisible Dialog with the specified owner frame, title, modality, and GraphicsConfiguration.

Parameters:
owner - the owner of the dialog
title - the title of the dialog. A null value will be accepted without causing a NullPointerException to be thrown.
modal - if true, dialog blocks input to other app windows when shown
gc - the GraphicsConfiguration of the target screen device. If gc is null, the same GraphicsConfiguration as the owning Frame is used.
Throws:
IllegalArgumentException - if owner is null. This exception is always thrown when GraphicsEnvironment.isHeadless() returns true
Since:
1.4
See Also:
GraphicsEnvironment.isHeadless(), Component.setSize(int, int), Component.setVisible(boolean)

Dialog

public Dialog(Dialog owner)
Constructs an initially invisible, non-modal Dialog with an empty title and the specified owner dialog.

Parameters:
owner - the owner of the dialog
Throws:
IllegalArgumentException - if owner is null. This exception is always thrown when GraphicsEnvironment.isHeadless() returns true
Since:
1.2
See Also:
GraphicsEnvironment.isHeadless()

Dialog

public Dialog(Dialog owner,
              String title)
Constructs an initially invisible, non-modal Dialog with the specified owner dialog and title.

Parameters:
owner - the owner of the dialog
title - the title of the dialog. A null value will be accepted without causing a NullPointerException to be thrown.
Throws:
IllegalArgumentException - if owner is null. This exception is always thrown when GraphicsEnvironment.isHeadless() returns true
Since:
1.2
See Also:
GraphicsEnvironment.isHeadless()

Dialog

public Dialog(Dialog owner,
              String title,
              boolean modal)
Constructs an initially invisible Dialog with the specified owner dialog, title, and modality.

Parameters:
owner - the owner of the dialog
title - the title of the dialog; a null value will be accepted without causing a NullPointerException to be thrown
modal - if true, dialog blocks input to other app windows when shown
Throws:
IllegalArgumentException - if the owner's GraphicsConfiguration is not from a screen device
IllegalArgumentException - if owner is null; this exception is always thrown when GraphicsEnvironment.isHeadless returns true
Since:
1.2
See Also:
GraphicsEnvironment.isHeadless()

Dialog

public Dialog(Dialog owner,
              String title,
              boolean modal,
              GraphicsConfiguration gc)
Constructs an initially invisible Dialog with the specified owner dialog, title, modality, and GraphicsConfiguration.

Parameters:
owner - the owner of the dialog
title - the title of the dialog; a null value will be accepted without causing a NullPointerException to be thrown
modal - if true, dialog blocks input to other app windows when shown
gc - the GraphicsConfiguration of the target screen device; if gc is null, the same GraphicsConfiguration as the owning Dialog is used
Throws:
IllegalArgumentException - if the owner's GraphicsConfiguration is not from a screen device
IllegalArgumentException - if owner is null; this exception is always thrown when GraphicsEnvironment.isHeadless returns true
Since:
1.4
See Also:
GraphicsEnvironment.isHeadless(), Component.setSize(int, int), Component.setVisible(boolean)
Method Detail

addNotify

public void addNotify()
Makes this Dialog displayable by connecting it to a native screen resource. Making a dialog displayable will cause any of its children to be made displayable. This method is called internally by the toolkit and should not be called directly by programs.

Overrides:
addNotify in class Window
See Also:
Component.isDisplayable(), Container.removeNotify()

isModal

public boolean isModal()
Indicates whether the dialog is modal. When a modal Dialog is made visible, user input will be blocked to the other windows in the application, except for any windows created with this dialog as their owner.

Returns:
true if this dialog window is modal; false otherwise.
See Also:
setModal(boolean)

setModal

public void setModal(boolean b)
Specifies whether this dialog should be modal.

Since:
JDK1.1
See Also:
isModal()

getTitle

public String getTitle()
Gets the title of the dialog. The title is displayed in the dialog's border.

Returns:
the title of this dialog window. The title may be null.
See Also:
setTitle(java.lang.String)

setTitle

public void setTitle(String title)
Sets the title of the Dialog.

Parameters:
title - the title displayed in the dialog's border; a null value results in an empty title
See Also:
getTitle()

show

public void show()
Makes the Dialog visible. If the dialog and/or its owner are not yet displayable, both are made displayable. The dialog will be validated prior to being made visible. If the dialog is already visible, this will bring the dialog to the front.

If the dialog is modal and is not already visible, this call will not return until the dialog is hidden by calling hide or dispose. It is permissible to show modal dialogs from the event dispatching thread because the toolkit will ensure that another event pump runs while the one which invoked this method is blocked.

Overrides:
show in class Window
See Also:
Component.hide(), Component.isDisplayable(), Component.validate(), isModal()

hide

public void hide()
Hides the Dialog and then causes show() to return if it is currently blocked.

Overrides:
hide in class Window
See Also:
Window.show(), Window.dispose()

dispose

public void dispose()
Disposes the Dialog and then causes show() to return if it is currently blocked.

Overrides:
dispose in class Window
See Also:
Component.isDisplayable(), Window.pack(), Window.show()

isResizable

public boolean isResizable()
Indicates whether this dialog is resizable by the user.

Returns:
true if the user can resize the dialog; false otherwise.
See Also:
setResizable(boolean)

setResizable

public void setResizable(boolean resizable)
Sets whether this dialog is resizable by the user.

Parameters:
resizable - true if the user can resize this dialog; false otherwise.
See Also:
isResizable()

setUndecorated

public void setUndecorated(boolean undecorated)
Disables or enables decorations for this dialog. This method can only be called while the dialog is not displayable.

Parameters:
undecorated - true if no dialog decorations are to be enabled; false if dialog decorations are to be enabled.
Throws:
IllegalComponentStateException - if the dialog is displayable.
Since:
1.4
See Also:
isUndecorated(), Component.isDisplayable()

isUndecorated

public boolean isUndecorated()
Indicates whether this dialog is undecorated. By default, all dialogs are initially decorated.

Returns:
true if dialog is undecorated; false otherwise.
Since:
1.4
See Also:
setUndecorated(boolean)

paramString

protected String paramString()
Returns a string representing the state of this dialog. 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 Container
Returns:
the parameter string of this dialog window.

getAccessibleContext

public AccessibleContext getAccessibleContext()
Gets the AccessibleContext associated with this Dialog. For dialogs, the AccessibleContext takes the form of an AccessibleAWTDialog. A new AccessibleAWTDialog instance is created if necessary.

Specified by:
getAccessibleContext in interface Accessible
Overrides:
getAccessibleContext in class Window
Returns:
an AccessibleAWTDialog that serves as the AccessibleContext of this Dialog
Overview  Package   Class  Use  Tree  Deprecated  Index  Help 
JavaTM 2 Platform
Std. Ed. v1.4.1
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Submit a bug or feature
For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

Copyright 2002 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.