Class JLayer<V extends Component>
- java.lang.Object
-
- java.awt.Component
-
- java.awt.Container
-
- javax.swing.JComponent
-
- javax.swing.JLayer<V>
- Type Parameters:
-
V
- the type ofJLayer
's view component
- All Implemented Interfaces:
-
ImageObserver
,MenuContainer
,PropertyChangeListener
,Serializable
,EventListener
,Accessible
,Scrollable
public final class JLayer<V extends Component> extends JComponent implements Scrollable, PropertyChangeListener, Accessible
JLayer
is a universal decorator for Swing components which enables you to implement various advanced painting effects as well as receive notifications of all AWTEvent
s generated within its borders.
JLayer
delegates the handling of painting and input events to a LayerUI
object, which performs the actual decoration.
The custom painting implemented in the LayerUI
and events notification work for the JLayer itself and all its subcomponents. This combination enables you to enrich existing components by adding new advanced functionality such as temporary locking of a hierarchy, data tips for compound components, enhanced mouse scrolling etc and so on.
JLayer
is a good solution if you only need to do custom painting over compound component or catch input events from its subcomponents.
import javax.swing.*; import javax.swing.plaf.LayerUI; import java.awt.*; public class JLayerSample { private static JLayer<JComponent> createLayer() { // This custom layerUI will fill the layer with translucent green // and print out all mouseMotion events generated within its borders LayerUI<JComponent> layerUI = new LayerUI<JComponent>() { public void paint(Graphics g, JComponent c) { // paint the layer as is super.paint(g, c); // fill it with the translucent green g.setColor(new Color(0, 128, 0, 128)); g.fillRect(0, 0, c.getWidth(), c.getHeight()); } public void installUI(JComponent c) { super.installUI(c); // enable mouse motion events for the layer's subcomponents ((JLayer) c).setLayerEventMask(AWTEvent.MOUSE_MOTION_EVENT_MASK); } public void uninstallUI(JComponent c) { super.uninstallUI(c); // reset the layer event mask ((JLayer) c).setLayerEventMask(0); } // overridden method which catches MouseMotion events public void eventDispatched(AWTEvent e, JLayer<? extends JComponent> l) { System.out.println("AWTEvent detected: " + e); } }; // create a component to be decorated with the layer JPanel panel = new JPanel(); panel.add(new JButton("JButton")); // create the layer for the panel using our custom layerUI return new JLayer<JComponent>(panel, layerUI); } private static void createAndShowGUI() { final JFrame frame = new JFrame(); frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); // work with the layer as with any other Swing component frame.add(createLayer()); frame.setSize(200, 200); frame.setLocationRelativeTo(null); frame.setVisible(true); } public static void main(String[] args) throws Exception { SwingUtilities.invokeAndWait(new Runnable() { public void run() { createAndShowGUI(); } }); } }Note:
JLayer
doesn't support the following methods: Container.add(java.awt.Component)
Container.add(String, java.awt.Component)
Container.add(java.awt.Component, int)
Container.add(java.awt.Component, Object)
Container.add(java.awt.Component, Object, int)
UnsupportedOperationException
to be thrown, to add a component to JLayer
use setView(Component)
or setGlassPane(JPanel)
.- Since:
- 1.7
- See Also:
-
JLayer(Component)
,setView(Component)
,getView()
,LayerUI
,JLayer(Component, LayerUI)
,setUI(javax.swing.plaf.LayerUI)
,getUI()
, Serialized Form
Nested Class Summary
Nested classes/interfaces declared in class javax.swing.JComponent
JComponent.AccessibleJComponent
Nested classes/interfaces declared in class java.awt.Container
Container.AccessibleAWTContainer
Nested classes/interfaces declared in class java.awt.Component
Component.AccessibleAWTComponent, Component.BaselineResizeBehavior, Component.BltBufferStrategy, Component.FlipBufferStrategy
Field Summary
Fields declared in class javax.swing.JComponent
listenerList, TOOL_TIP_TEXT_KEY, ui, UNDEFINED_CONDITION, WHEN_ANCESTOR_OF_FOCUSED_COMPONENT, WHEN_FOCUSED, WHEN_IN_FOCUSED_WINDOW
Fields declared in class java.awt.Component
accessibleContext, BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, TOP_ALIGNMENT
Fields declared in interface java.awt.image.ImageObserver
ABORT, ALLBITS, ERROR, FRAMEBITS, HEIGHT, PROPERTIES, SOMEBITS, WIDTH
Constructor Summary
Constructor | Description |
---|---|
JLayer() | Creates a new |
JLayer(V view) | Creates a new |
JLayer(V view,
LayerUI<V> ui) | Creates a new |
Method Summary
Modifier and Type | Method | Description |
---|---|---|
protected void | addImpl(Component comp,
Object constraints,
int index) | This method is not supported by |
JPanel | createGlassPane() | Called by the constructor methods to create a default |
void | doLayout() | Delegates its functionality to the |
AccessibleContext | getAccessibleContext() | Gets the AccessibleContext associated with this |
Border | getBorder() | Delegates its functionality to the |
JPanel | getGlassPane() | Returns the |
long | getLayerEventMask() | Returns the bitmap of event mask to receive by this |
Dimension | getPreferredScrollableViewportSize() | Returns the preferred size of the viewport for a view component. |
int | getScrollableBlockIncrement(Rectangle visibleRect,
int orientation,
int direction) | Returns a scroll increment, which is required for components that display logical rows or columns in order to completely expose one block of rows or columns, depending on the value of orientation. |
boolean | getScrollableTracksViewportHeight() | Returns |
boolean | getScrollableTracksViewportWidth() | Returns |
int | getScrollableUnitIncrement(Rectangle visibleRect,
int orientation,
int direction) | Returns a scroll increment, which is required for components that display logical rows or columns in order to completely expose one new row or column, depending on the value of orientation. |
LayerUI<? super V> | getUI() | Returns the |
V | getView() | Returns the |
boolean | imageUpdate(Image img,
int infoflags,
int x,
int y,
int w,
int h) | Delegates its functionality to the |
boolean | isOptimizedDrawingEnabled() | The |
protected boolean | isPaintingOrigin() | Always returns |
void | paint(Graphics g) | Delegates all painting to the |
protected void | paintComponent(Graphics g) | This method is empty, because all painting is done by |
void | paintImmediately(int x,
int y,
int w,
int h) | Delegates its functionality to the |
void | setBorder(Border border) | Delegates its functionality to the |
void | setGlassPane(JPanel glassPane) | Sets the |
void | setLayerEventMask(long layerEventMask) | Enables the events from JLayer and all its descendants defined by the specified event mask parameter to be delivered to the |
void | setLayout(LayoutManager mgr) | Sets the layout manager for this container. |
void | setUI(LayerUI<? super V> ui) | Sets the |
void | setView(V view) | Sets the |
void | updateUI() | Delegates its functionality to the |
Methods declared in class javax.swing.JComponent
addAncestorListener, addNotify, addVetoableChangeListener, computeVisibleRect, contains, createToolTip, disable, enable, firePropertyChange, firePropertyChange, fireVetoableChange, getActionForKeyStroke, getActionMap, getAlignmentX, getAlignmentY, getAncestorListeners, getAutoscrolls, getBaseline, getBaselineResizeBehavior, 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, getUIClassID, getVerifyInputWhenFocusTarget, getVetoableChangeListeners, getVisibleRect, getWidth, getX, getY, grabFocus, isDoubleBuffered, isLightweightComponent, isManagingFocus, isOpaque, isPaintingForPrint, isPaintingTile, isRequestFocusEnabled, isValidateRoot, paintBorder, paintChildren, paintImmediately, paramString, 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, 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 declared in class java.awt.Container
add, add, add, add, add, addContainerListener, addPropertyChangeListener, addPropertyChangeListener, applyComponentOrientation, areFocusTraversalKeysSet, countComponents, deliverEvent, 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, transferFocusDownCycle, validate, validateTree
Methods declared in 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, 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, getPropertyChangeListeners, getPropertyChangeListeners, getSize, getToolkit, getTreeLock, gotFocus, handleEvent, hasFocus, hide, 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, requestFocus, requestFocus, requestFocusInWindow, resize, resize, setBounds, setBounds, setComponentOrientation, setCursor, setDropTarget, setFocusable, setFocusTraversalKeysEnabled, setIgnoreRepaint, setLocale, setLocation, setLocation, setMixingCutoutShape, setName, setSize, setSize, show, show, size, toString, transferFocus, transferFocusBackward, transferFocusUpCycle
Methods declared in class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
Methods declared in interface java.beans.PropertyChangeListener
propertyChange
Constructor Detail
JLayer
public JLayer()
Creates a new JLayer
object with a null
view component and default LayerUI
.
JLayer
public JLayer(V view)
Creates a new JLayer
object with default LayerUI
.
- Parameters:
-
view
- the component to be decorated by thisJLayer
- See Also:
setUI(javax.swing.plaf.LayerUI<? super V>)
JLayer
public JLayer(V view, LayerUI<V> ui)
Creates a new JLayer
object with the specified view component and LayerUI
object.
- Parameters:
-
view
- the component to be decorated -
ui
- theLayerUI
delegate to be used by thisJLayer
Method Detail
getView
public V getView()
Returns the JLayer
's view component or null
.
This is a bound property.
- Returns:
- the
JLayer
's view component ornull
if none exists - See Also:
setView(Component)
setView
public void setView(V view)
Sets the JLayer
's view component, which can be null
.
This is a bound property.
- Parameters:
-
view
- the view component for thisJLayer
- See Also:
getView()
setUI
public void setUI(LayerUI<? super V> ui)
Sets the LayerUI
which will perform painting and receive input events for this JLayer
.
- Parameters:
-
ui
- theLayerUI
for thisJLayer
getUI
public LayerUI<? super V> getUI()
Returns the LayerUI
for this JLayer
.
- Overrides:
-
getUI
in classJComponent
- Returns:
- the
LayerUI
for thisJLayer
getGlassPane
public JPanel getGlassPane()
Returns the JLayer
's glassPane component or null
.
This is a bound property.
- Returns:
- the
JLayer
's glassPane component ornull
if none exists - See Also:
setGlassPane(JPanel)
setGlassPane
public void setGlassPane(JPanel glassPane)
Sets the JLayer
's glassPane component, which can be null
.
This is a bound property.
- Parameters:
-
glassPane
- the glassPane component of thisJLayer
- See Also:
getGlassPane()
createGlassPane
public JPanel createGlassPane()
Called by the constructor methods to create a default glassPane
. By default this method creates a new JPanel with visibility set to true and opacity set to false.
- Returns:
- the default
glassPane
setLayout
public void setLayout(LayoutManager mgr)
Sets the layout manager for this container. This method is overridden to prevent the layout manager from being set.
Note: If mgr
is non-null
, this method will throw an exception as layout managers are not supported on a JLayer
.
- Overrides:
-
setLayout
in classContainer
- Parameters:
-
mgr
- the specified layout manager - Throws:
-
IllegalArgumentException
- this method is not supported - See Also:
-
Container.doLayout()
,Container.getLayout()
,Container.invalidate()
setBorder
public void setBorder(Border border)
Delegates its functionality to the getView().setBorder(Border)
method, if the view component is an instance of javax.swing.JComponent
, otherwise this method is a no-op.
- Overrides:
-
setBorder
in classJComponent
- Parameters:
-
border
- the border to be rendered for theview
component - See Also:
-
getView()
,JComponent.setBorder(Border)
getBorder
public Border getBorder()
Delegates its functionality to the getView().getBorder()
method, if the view component is an instance of javax.swing.JComponent
, otherwise returns null
.
- Overrides:
-
getBorder
in classJComponent
- Returns:
- the border object for the
view
component - See Also:
-
getView()
,setBorder(javax.swing.border.Border)
,JComponent.getBorder()
addImpl
protected void addImpl(Component comp, Object constraints, int index)
This method is not supported by JLayer
and always throws UnsupportedOperationException
- Overrides:
-
addImpl
in classContainer
- Parameters:
-
comp
- the component to be added -
constraints
- an object expressing layout constraints for this component -
index
- the position in the container's list at which to insert the component, where-1
means append to the end - Throws:
-
UnsupportedOperationException
- this method is not supported - See Also:
-
setView(Component)
,setGlassPane(JPanel)
isPaintingOrigin
protected boolean isPaintingOrigin()
Always returns true
to cause painting to originate from JLayer
, or one of its ancestors.
- Overrides:
-
isPaintingOrigin
in classJComponent
- Returns:
- true
- See Also:
JComponent.isPaintingOrigin()
paintImmediately
public void paintImmediately(int x, int y, int w, int h)
Delegates its functionality to the LayerUI.paintImmediately(int, int, int, int, JLayer)
method, if LayerUI
is set.
- Overrides:
-
paintImmediately
in classJComponent
- Parameters:
-
x
- the x value of the region to be painted -
y
- the y value of the region to be painted -
w
- the width of the region to be painted -
h
- the height of the region to be painted - See Also:
-
JComponent.repaint(long, int, int, int, int)
,JComponent.isPaintingOrigin()
imageUpdate
public boolean imageUpdate(Image img, int infoflags, int x, int y, int w, int h)
Delegates its functionality to the LayerUI.imageUpdate(java.awt.Image, int, int, int, int, int, JLayer)
method, if the LayerUI
is set.
- Specified by:
-
imageUpdate
in interfaceImageObserver
- Overrides:
-
imageUpdate
in classComponent
- Parameters:
-
img
- the image being observed -
infoflags
- seeimageUpdate
for more information -
x
- the x coordinate -
y
- the y coordinate -
w
- the width -
h
- the height - Returns:
-
false
if the infoflags indicate that the image is completely loaded;true
otherwise. - See Also:
-
ImageObserver
,Graphics.drawImage(Image, int, int, Color, java.awt.image.ImageObserver)
,Graphics.drawImage(Image, int, int, java.awt.image.ImageObserver)
,Graphics.drawImage(Image, int, int, int, int, Color, java.awt.image.ImageObserver)
,Graphics.drawImage(Image, int, int, int, int, java.awt.image.ImageObserver)
,ImageObserver.imageUpdate(java.awt.Image, int, int, int, int, int)
paint
public void paint(Graphics g)
Delegates all painting to the LayerUI
object.
- Overrides:
-
paint
in classJComponent
- Parameters:
-
g
- theGraphics
to render to - See Also:
-
JComponent.paintComponent(java.awt.Graphics)
,JComponent.paintBorder(java.awt.Graphics)
,JComponent.paintChildren(java.awt.Graphics)
,JComponent.getComponentGraphics(java.awt.Graphics)
,JComponent.repaint(long, int, int, int, int)
paintComponent
protected void paintComponent(Graphics g)
This method is empty, because all painting is done by paint(Graphics)
and ComponentUI.update(Graphics, JComponent)
methods
- Overrides:
-
paintComponent
in classJComponent
- Parameters:
-
g
- theGraphics
object to protect - See Also:
-
JComponent.paint(java.awt.Graphics)
,ComponentUI
isOptimizedDrawingEnabled
public boolean isOptimizedDrawingEnabled()
The JLayer
overrides the default implementation of this method (in JComponent
) to return false
. This ensures that the drawing machinery will call the JLayer
's paint
implementation rather than messaging the JLayer
's children directly.
- Overrides:
-
isOptimizedDrawingEnabled
in classJComponent
- Returns:
- false
setLayerEventMask
public void setLayerEventMask(long layerEventMask)
Enables the events from JLayer and all its descendants defined by the specified event mask parameter to be delivered to the LayerUI.eventDispatched(AWTEvent, JLayer)
method.
Events are delivered provided that LayerUI
is set for this JLayer
and the JLayer
is displayable.
The following example shows how to correctly use this method in the LayerUI
implementations:
public void installUI(JComponent c) { super.installUI(c); JLayer l = (JLayer) c; // this LayerUI will receive only key and focus events l.setLayerEventMask(AWTEvent.KEY_EVENT_MASK | AWTEvent.FOCUS_EVENT_MASK); } public void uninstallUI(JComponent c) { super.uninstallUI(c); JLayer l = (JLayer) c; // JLayer must be returned to its initial state l.setLayerEventMask(0); }By default
JLayer
receives no events and its event mask is 0
.- Parameters:
-
layerEventMask
- the bitmask of event types to receive - See Also:
-
getLayerEventMask()
,LayerUI.eventDispatched(AWTEvent, JLayer)
,Component.isDisplayable()
getLayerEventMask
public long getLayerEventMask()
Returns the bitmap of event mask to receive by this JLayer
and its LayerUI
.
It means that LayerUI.eventDispatched(AWTEvent, JLayer)
method will only receive events that match the event mask.
By default JLayer
receives no events.
- Returns:
- the bitmask of event types to receive for this
JLayer
updateUI
public void updateUI()
Delegates its functionality to the LayerUI.updateUI(JLayer)
method, if LayerUI
is set.
- Overrides:
-
updateUI
in classJComponent
- See Also:
-
JComponent.setUI(javax.swing.plaf.ComponentUI)
,UIManager.getLookAndFeel()
,UIManager.getUI(javax.swing.JComponent)
getPreferredScrollableViewportSize
public Dimension getPreferredScrollableViewportSize()
Returns the preferred size of the viewport for a view component.
If the view component of this layer implements Scrollable
, this method delegates its implementation to the view component.
- Specified by:
-
getPreferredScrollableViewportSize
in interfaceScrollable
- Returns:
- the preferred size of the viewport for a view component
- See Also:
Scrollable
getScrollableBlockIncrement
public int getScrollableBlockIncrement(Rectangle visibleRect, int orientation, int direction)
Returns a scroll increment, which is required for components that display logical rows or columns in order to completely expose one block of rows or columns, depending on the value of orientation.
If the view component of this layer implements Scrollable
, this method delegates its implementation to the view component.
- Specified by:
-
getScrollableBlockIncrement
in interfaceScrollable
- Parameters:
-
visibleRect
- The view area visible within the viewport -
orientation
- Either SwingConstants.VERTICAL or SwingConstants.HORIZONTAL. -
direction
- Less than zero to scroll up/left, greater than zero for down/right. - Returns:
- the "block" increment for scrolling in the specified direction
- See Also:
Scrollable
getScrollableTracksViewportHeight
public boolean getScrollableTracksViewportHeight()
Returns false
to indicate that the height of the viewport does not determine the height of the layer, unless the preferred height of the layer is smaller than the height of the viewport.
If the view component of this layer implements Scrollable
, this method delegates its implementation to the view component.
- Specified by:
-
getScrollableTracksViewportHeight
in interfaceScrollable
- Returns:
- whether the layer should track the height of the viewport
- See Also:
Scrollable
getScrollableTracksViewportWidth
public boolean getScrollableTracksViewportWidth()
Returns false
to indicate that the width of the viewport does not determine the width of the layer, unless the preferred width of the layer is smaller than the width of the viewport.
If the view component of this layer implements Scrollable
, this method delegates its implementation to the view component.
- Specified by:
-
getScrollableTracksViewportWidth
in interfaceScrollable
- Returns:
- whether the layer should track the width of the viewport
- See Also:
Scrollable
getScrollableUnitIncrement
public int getScrollableUnitIncrement(Rectangle visibleRect, int orientation, int direction)
Returns a scroll increment, which is required for components that display logical rows or columns in order to completely expose one new row or column, depending on the value of orientation. Ideally, components should handle a partially exposed row or column by returning the distance required to completely expose the item.
Scrolling containers, like JScrollPane
, will use this method each time the user requests a unit scroll.
If the view component of this layer implements Scrollable
, this method delegates its implementation to the view component.
- Specified by:
-
getScrollableUnitIncrement
in interfaceScrollable
- Parameters:
-
visibleRect
- The view area visible within the viewport -
orientation
- Either SwingConstants.VERTICAL or SwingConstants.HORIZONTAL. -
direction
- Less than zero to scroll up/left, greater than zero for down/right. - Returns:
- The "unit" increment for scrolling in the specified direction. This value should always be positive.
- See Also:
Scrollable
doLayout
public void doLayout()
Delegates its functionality to the LayerUI.doLayout(JLayer)
method, if LayerUI
is set.
- Overrides:
-
doLayout
in classContainer
- See Also:
-
LayoutManager.layoutContainer(java.awt.Container)
,Container.setLayout(java.awt.LayoutManager)
,Container.validate()
getAccessibleContext
public AccessibleContext getAccessibleContext()
Gets the AccessibleContext associated with this JLayer
.
- Specified by:
-
getAccessibleContext
in interfaceAccessible
- Overrides:
-
getAccessibleContext
in classComponent
- Returns:
- the AccessibleContext associated with this
JLayer
.