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JDK 5 Documentation v6.0, Java 2 SDK 英文文档
JPanel (Java Platform SE 6) - JDK 5 Documentation v6.0, Java 2 SDK 英文文档
javax.swing
Class JPanel
java.lang.Object
java.awt.Component
java.awt.Container
javax.swing.JComponent
javax.swing.JPanel
- All Implemented Interfaces:
- ImageObserver, MenuContainer, Serializable, Accessible
- Direct Known Subclasses:
- AbstractColorChooserPanel, JSpinner.DefaultEditor
public class JPanel
- extends JComponent
- implements Accessible
JPanel is a generic lightweight container.
For examples and task-oriented documentation for JPanel, see
How to Use Panels,
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 JavaBeansTM
has been added to the java.beans package.
Please see XMLEncoder.
|
Nested Class Summary |
protected class |
JPanel.AccessibleJPanel
This class implements accessibility support for the
JPanel class. |
|
Constructor Summary |
JPanel()
Creates a new JPanel with a double buffer
and a flow layout. |
JPanel(boolean isDoubleBuffered)
Creates a new JPanel with FlowLayout
and the specified buffering strategy. |
JPanel(LayoutManager layout)
Create a new buffered JPanel with the specified layout manager |
JPanel(LayoutManager layout,
boolean isDoubleBuffered)
Creates a new JPanel with the specified layout manager and buffering
strategy. |
|
Method Summary |
AccessibleContext |
getAccessibleContext()
Gets the AccessibleContext associated with this JPanel. |
PanelUI |
getUI()
Returns the look and feel (L&F) object that renders this component. |
String |
getUIClassID()
Returns a string that specifies the name of the L&F class
that renders this component. |
protected String |
paramString()
Returns a string representation of this JPanel. |
void |
setUI(PanelUI ui)
Sets the look and feel (L&F) object that renders this component. |
void |
updateUI()
Resets the UI property with a value from the current look and feel. |
| 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, getBaseline, getBaselineResizeBehavior, 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, isOpaque, isOptimizedDrawingEnabled, isPaintingForPrint, isPaintingTile, isRequestFocusEnabled, isValidateRoot, paint, 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, addImpl, 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, remove, removeAll, 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 |
JPanel
public JPanel(LayoutManager layout,
boolean isDoubleBuffered)
- Creates a new JPanel with the specified layout manager and buffering
strategy.
- Parameters:
layout - the LayoutManager to useisDoubleBuffered - a boolean, true for double-buffering, which
uses additional memory space to achieve fast, flicker-free
updates
JPanel
public JPanel(LayoutManager layout)
- Create a new buffered JPanel with the specified layout manager
- Parameters:
layout - the LayoutManager to use
JPanel
public JPanel(boolean isDoubleBuffered)
- Creates a new
JPanel with FlowLayout
and the specified buffering strategy.
If isDoubleBuffered is true, the JPanel
will use a double buffer.
- Parameters:
isDoubleBuffered - a boolean, true for double-buffering, which
uses additional memory space to achieve fast, flicker-free
updates
JPanel
public JPanel()
- Creates a new
JPanel with a double buffer
and a flow layout.
updateUI
public void updateUI()
- Resets the UI property with a value from the current look and feel.
- Overrides:
updateUI in class JComponent
- See Also:
JComponent.updateUI()
getUI
public PanelUI getUI()
- Returns the look and feel (L&F) object that renders this component.
- Returns:
- the PanelUI object that renders this component
- Since:
- 1.4
setUI
public void setUI(PanelUI ui)
- Sets the look and feel (L&F) object that renders this component.
- Parameters:
ui - the PanelUI L&F object- Since:
- 1.4
- See Also:
UIDefaults.getUI(javax.swing.JComponent)
getUIClassID
public String getUIClassID()
- Returns a string that specifies the name of the L&F class
that renders this component.
- Overrides:
getUIClassID in class JComponent
- Returns:
- "PanelUI"
- See Also:
JComponent.getUIClassID(),
UIDefaults.getUI(javax.swing.JComponent)
paramString
protected String paramString()
- Returns a string representation of this JPanel. 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 JComponent
- Returns:
- a string representation of this JPanel.
getAccessibleContext
public AccessibleContext getAccessibleContext()
- Gets the AccessibleContext associated with this JPanel.
For JPanels, the AccessibleContext takes the form of an
AccessibleJPanel.
A new AccessibleJPanel instance is created if necessary.
- Specified by:
getAccessibleContext in interface Accessible- Overrides:
getAccessibleContext in class JComponent
- Returns:
- an AccessibleJPanel that serves as the
AccessibleContext of this JPanel
Submit a bug or feature
For further API reference and developer documentation, see Java SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples. Copyright 2006 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.
