javax.swing
Class JLayeredPane

java.lang.Object
  |
  +--java.awt.Component
        |
        +--java.awt.Container
              |
              +--javax.swing.JComponent
                    |
                    +--javax.swing.JLayeredPane

All Implemented Interfaces:

Accessible, java.awt.image.ImageObserver, MenuContainer, Serializable

Direct Known Subclasses:

JDesktopPane

public class JLayeredPane

extends JComponent

implements Accessible

Unsafe:

See Also:

Serialized Form

Field Summary

private Hashtable	componentToLayer
static Integer	DEFAULT_LAYER Suppressed: Convenience object defining the Default layer.
static Integer	DRAG_LAYER Suppressed: Convenience object defining the Drag layer.
static Integer	FRAME_CONTENT_LAYER Suppressed: Convenience object defining the Frame Content layer.
static String	LAYER_PROPERTY Suppressed: Bound property
static Integer	MODAL_LAYER Suppressed: Convenience object defining the Modal layer.
private boolean	optimizedDrawingPossible
static Integer	PALETTE_LAYER Suppressed: Convenience object defining the Palette layer.
static Integer	POPUP_LAYER Suppressed: Convenience object defining the Popup layer.

Fields inherited from class javax.swing.JComponent

_bounds, accessibleContext, listenerList, paintingChild, TOOL_TIP_TEXT_KEY, ui, UNDEFINED_CONDITION, WHEN_ANCESTOR_OF_FOCUSED_COMPONENT, WHEN_FOCUSED, WHEN_IN_FOCUSED_WINDOW

Fields inherited from class java.awt.Container

Fields inherited from class java.awt.Component

BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, TOP_ALIGNMENT

Constructor Summary

JLayeredPane()
Suppressed: Create a new JLayeredPane

Method Summary

protected void	addImpl(Component comp, Object constraints, int index) Adds the specified component to this container at the specified index.
AccessibleContext	getAccessibleContext() Suppressed: Gets the AccessibleContext associated with this JLayeredPane.
int	getComponentCountInLayer(int layer) Suppressed: Returns the number of children currently in the specified layer.
Component[]	getComponentsInLayer(int layer) Suppressed: Returns an array of the components in the specified layer.
protected Hashtable	getComponentToLayer() Returns the hashtable that maps components to layers.
int	getIndexOf(Component c) Suppressed: Returns the index of the specified Component.
int	getLayer(Component c) Suppressed: Returns the layer attribute for the specified Component.
static int	getLayer(JComponent c) Suppressed: Gets the layer property for a JComponent, it does not cause any side effects like setLayer().
static JLayeredPane	getLayeredPaneAbove(Component c) Suppressed: Convenience method that returns the first JLayeredPane which contains the specified component.
protected Integer	getObjectForLayer(int layer) Returns the Integer object associated with a specified layer.
int	getPosition(Component c) Suppressed: Get the relative position of the component within its layer.
int	highestLayer() Suppressed: Returns the highest layer value from all current children.
protected int	insertIndexForLayer(int layer, int position) Primitive method that determines the proper location to insert a new child based on layer and position requests.
boolean	isOptimizedDrawingEnabled() Suppressed: Returns false if components in the pane can overlap, which makes optimized drawing impossible.
int	lowestLayer() Suppressed: Returns the lowest layer value from all current children.
void	moveToBack(Component c) Suppressed: Moves the component to the bottom of the components in its current layer (position -1).
void	moveToFront(Component c) Suppressed: Moves the component to the top of the components in its current layer (position 0).
void	paint(Graphics g) Suppressed: Paints this JLayeredPane within the specified graphics context.
protected String	paramString() Returns a string representation of this JLayeredPane.
static void	putLayer(JComponent c, int layer) Suppressed: Sets the layer property on a JComponent.
void	remove(int index) Suppressed: Remove the indexed component from this pane.
void	setLayer(Component c, int layer) Suppressed: Sets the layer attribute on the specified component, making it the bottommost component in that layer.
void	setLayer(Component c, int layer, int position) Suppressed: Sets the layer attribute for the specified component and also sets its position within that layer.
void	setPosition(Component c, int position) Suppressed: Moves the component to position within its current layer, where 0 is the topmost position within the layer and -1 is the bottommost position.
private void	validateOptimizedDrawing()

Methods inherited from class javax.swing.JComponent

_paintImmediately, addAncestorListener, addNotify, addPropertyChangeListener, addPropertyChangeListener, addVetoableChangeListener, alwaysOnTop, checkIfChildObscuredBySibling, componentInputMapChanged, computeVisibleRect, computeVisibleRect, compWriteObjectNotify, contains, createToolTip, disable, enable, enableSerialization, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, fireVetoableChange, getActionForKeyStroke, getActionMap, getActionMap, getAlignmentX, getAlignmentY, getAncestorListeners, getAutoscrolls, getBorder, getBounds, getClientProperty, getComponentGraphics, getConditionForKeyStroke, getCreatedDoubleBuffer, getDebugGraphicsOptions, getDefaultLocale, getGraphics, getHeight, getInputMap, getInputMap, getInputMap, getInputVerifier, getInsets, getInsets, getListeners, getLocation, getManagingFocusBackwardTraversalKeys, getManagingFocusForwardTraversalKeys, getMaximumSize, getMinimumSize, getNextFocusableComponent, getPreferredSize, getPropertyChangeListeners, getPropertyChangeListeners, getRegisteredKeyStrokes, getRootPane, getSize, getToolTipLocation, getToolTipText, getToolTipText, getTopLevelAncestor, getTransferHandler, getUIClassID, getVerifyInputWhenFocusTarget, getVetoableChangeListeners, getVisibleRect, getWidth, getWriteObjCounter, getX, getY, grabFocus, isDoubleBuffered, isLightweightComponent, isManagingFocus, isMaximumSizeSet, isMinimumSizeSet, isOpaque, isPaintingTile, isPreferredSizeSet, isRequestFocusEnabled, isValidateRoot, paintBorder, paintChildren, paintComponent, paintImmediately, paintImmediately, print, printAll, printBorder, printChildren, printComponent, processComponentKeyEvent, processKeyBinding, processKeyBindings, processKeyBindingsForAllComponents, processKeyEvent, processMouseMotionEvent, putClientProperty, rectangleIsObscured, registerKeyboardAction, registerKeyboardAction, removeAncestorListener, removeNotify, removePropertyChangeListener, removePropertyChangeListener, removeVetoableChangeListener, repaint, repaint, requestDefaultFocus, requestFocus, requestFocus, requestFocusInWindow, requestFocusInWindow, resetKeyboardActions, reshape, revalidate, scrollRectToVisible, setActionMap, setAlignmentX, setAlignmentY, setAutoscrolls, setBackground, setBorder, setCreatedDoubleBuffer, setDebugGraphicsOptions, setDefaultLocale, setDoubleBuffered, setEnabled, setFont, setForeground, setInputMap, setInputVerifier, setMaximumSize, setMinimumSize, setNextFocusableComponent, setOpaque, setPaintingChild, setPreferredSize, setRequestFocusEnabled, setToolTipText, setTransferHandler, setUI, setVerifyInputWhenFocusTarget, setVisible, setWriteObjCounter, shouldDebugGraphics, superProcessMouseMotionEvent, unregisterKeyboardAction, update, updateUI

Methods inherited from class java.awt.Container

add, add, add, add, add, addContainerListener, applyComponentOrientation, areFocusTraversalKeysSet, countComponents, deliverEvent, doLayout, findComponentAt, findComponentAt, get, getComponent, getComponentAt, getComponentAt, getComponentCount, getComponents, getContainerListeners, getFocusTraversalKeys, getFocusTraversalPolicy, getLayout, insets, invalidate, isAncestorOf, isFocusCycleRoot, isFocusCycleRoot, isFocusTraversalPolicySet, iterate, layout, list, list, locate, minimumSize, paintComponents, preferredSize, printComponents, processContainerEvent, processEvent, remove, removeAll, removeContainerListener, setFocusCycleRoot, setFocusTraversalKeys, setFocusTraversalPolicy, setLayout, size, 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, getBackground, getBounds, getColorModel, getComponentListeners, getComponentOrientation, getCursor, getDropTarget, getFocusCycleRootAncestor, getFocusListeners, getFocusTraversalKeysEnabled, getFont, getFontMetrics, getForeground, getGraphicsConfiguration, getHierarchyBoundsListeners, getHierarchyListeners, getIgnoreRepaint, getInputContext, getInputMethodListeners, getInputMethodRequests, getKeyListeners, getLocale, getLocation, getLocationOnScreen, getMouseListeners, getMouseMotionListeners, getMouseWheelListeners, getName, getParent, getPeer, getSize, getToolkit, getTreeLock, gotFocus, handleEvent, hasFocus, hide, imageUpdate, inside, isBackgroundSet, isCursorSet, isDisplayable, isEnabled, isFocusable, isFocusOwner, isFocusTraversable, isFontSet, isForegroundSet, isLightweight, 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, processMouseEvent, processMouseWheelEvent, remove, removeComponentListener, removeFocusListener, removeHierarchyBoundsListener, removeHierarchyListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removeMouseWheelListener, repaint, repaint, repaint, resize, resize, setBounds, setBounds, setComponentOrientation, setCursor, setDropTarget, setFocusable, setFocusTraversalKeysEnabled, setIgnoreRepaint, setLocale, setLocation, setLocation, setName, setSize, setSize, show, show, toString, transferFocus, transferFocus, transferFocusUpCycle

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_LAYER

public static final Integer DEFAULT_LAYER

Suppressed: Convenience object defining the Default layer. Equivalent to new Integer(0).

PALETTE_LAYER

public static final Integer PALETTE_LAYER

Suppressed: Convenience object defining the Palette layer. Equivalent to new Integer(100).

MODAL_LAYER

public static final Integer MODAL_LAYER

Suppressed: Convenience object defining the Modal layer. Equivalent to new Integer(200).

POPUP_LAYER

public static final Integer POPUP_LAYER

Suppressed: Convenience object defining the Popup layer. Equivalent to new Integer(300).

DRAG_LAYER

public static final Integer DRAG_LAYER

Suppressed: Convenience object defining the Drag layer. Equivalent to new Integer(400).

FRAME_CONTENT_LAYER

public static final Integer FRAME_CONTENT_LAYER

Suppressed: Convenience object defining the Frame Content layer. This layer is normally only use to positon the contentPane and menuBar components of JFrame. Equivalent to new Integer(-30000).

See Also:

JFrame

LAYER_PROPERTY

public static final String LAYER_PROPERTY

Suppressed: Bound property

componentToLayer

private Hashtable componentToLayer

optimizedDrawingPossible

private boolean optimizedDrawingPossible

Constructor Detail

JLayeredPane

public JLayeredPane()

Suppressed: Create a new JLayeredPane

Method Detail

validateOptimizedDrawing

private void validateOptimizedDrawing()

addImpl

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

Description copied from class: Container

Adds the specified component to this container at the specified index. This method also notifies the layout manager to add the component to this container's layout using the specified constraints object via the addLayoutComponent method. The constraints are defined by the particular layout manager being used. For example, the BorderLayout class defines five constraints: BorderLayout.NORTH, BorderLayout.SOUTH, BorderLayout.EAST, BorderLayout.WEST, and BorderLayout.CENTER.

Note that if the component already exists in this container or a child of this container, it is removed from that container before being added to this container.

This is the method to override if a program needs to track every add request to a container as all other add methods defer to this one. An overriding method should usually include a call to the superclass's version of the method:

super.addImpl(comp, constraints, index)

Overrides:

addImpl in class Container

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

See Also:

Container.add(Component), Container.add(Component, int), Container.add(Component, java.lang.Object), LayoutManager, LayoutManager2

remove

public void remove(int index)

Suppressed: Remove the indexed component from this pane. This is the absolute index, ignoring layers.

Overrides:

remove in class Container

Parameters:

index - an int specifying the component to remove

See Also:

getIndexOf(java.awt.Component)

isOptimizedDrawingEnabled

public boolean isOptimizedDrawingEnabled()

Suppressed: Returns false if components in the pane can overlap, which makes optimized drawing impossible. Otherwise, returns true.

Overrides:

isOptimizedDrawingEnabled in class JComponent

Returns:

false if components can overlap, else true

See Also:

JComponent.isOptimizedDrawingEnabled()

putLayer

public static void putLayer(JComponent c,
                            int layer)

Suppressed: Sets the layer property on a JComponent. This method does not cause any side effects like setLayer() (painting, add/remove, etc). Normally you should use the instance method setLayer(), in order to get the desired side-effects (like repainting).

Parameters:

c - the JComponent to move

layer - an int specifying the layer to move it to

See Also:

setLayer(java.awt.Component, int)

getLayer

public static int getLayer(JComponent c)

Suppressed: Gets the layer property for a JComponent, it does not cause any side effects like setLayer(). (painting, add/remove, etc) Normally you should use the instance method getLayer().

Parameters:

c - the JComponent to check

Returns:

an int specifying the component's layer

getLayeredPaneAbove

public static JLayeredPane getLayeredPaneAbove(Component c)

Suppressed: Convenience method that returns the first JLayeredPane which contains the specified component. Note that all JFrames have a JLayeredPane at their root, so any component in a JFrame will have a JLayeredPane parent.

Parameters:

c - the Component to check

Returns:

the JLayeredPane that contains the component, or null if no JLayeredPane is found in the component hierarchy

See Also:

JFrame, JRootPane

setLayer

public void setLayer(Component c,
                     int layer)

Suppressed: Sets the layer attribute on the specified component, making it the bottommost component in that layer. Should be called before adding to parent.

Parameters:

c - the Component to set the layer for

layer - an int specifying the layer to set, where lower numbers are closer to the bottom

setLayer

public void setLayer(Component c,
                     int layer,
                     int position)

Suppressed: Sets the layer attribute for the specified component and also sets its position within that layer.

Parameters:

c - the Component to set the layer for

layer - an int specifying the layer to set, where lower numbers are closer to the bottom

position - an int specifying the position within the layer, where 0 is the topmost position and -1 is the bottommost position

getLayer

public int getLayer(Component c)

Suppressed: Returns the layer attribute for the specified Component.

Parameters:

c - the Component to check

Returns:

an int specifying the component's current layer

getIndexOf

public int getIndexOf(Component c)

Suppressed: Returns the index of the specified Component. This is the absolute index, ignoring layers. Index numbers, like position numbers, have the topmost component at index zero. Larger numbers are closer to the bottom.

Parameters:

c - the Component to check

Returns:

an int specifying the component's index

moveToFront

public void moveToFront(Component c)

Suppressed: Moves the component to the top of the components in its current layer (position 0).

Parameters:

c - the Component to move

See Also:

setPosition(Component, int)

moveToBack

public void moveToBack(Component c)

Suppressed: Moves the component to the bottom of the components in its current layer (position -1).

Parameters:

c - the Component to move

See Also:

setPosition(Component, int)

setPosition

public void setPosition(Component c,
                        int position)

Suppressed: Moves the component to position within its current layer, where 0 is the topmost position within the layer and -1 is the bottommost position.

Note: Position numbering is defined by java.awt.Container, and is the opposite of layer numbering. Lower position numbers are closer to the top (0 is topmost), and higher position numbers are closer to the bottom.

Parameters:

c - the Component to move

position - an int in the range -1..N-1, where N is the number of components in the component's current layer

getPosition

public int getPosition(Component c)

Suppressed: Get the relative position of the component within its layer.

Parameters:

c - the Component to check

Returns:

an int giving the component's position, where 0 is the topmost position and the highest index value = the count count of components at that layer, minus 1

See Also:

getComponentCountInLayer(int)

highestLayer

public int highestLayer()

Suppressed: Returns the highest layer value from all current children. Returns 0 if there are no children.

Returns:

an int indicating the layer of the topmost component in the pane, or zero if there are no children

lowestLayer

public int lowestLayer()

Suppressed: Returns the lowest layer value from all current children. Returns 0 if there are no children.

Returns:

an int indicating the layer of the bottommost component in the pane, or zero if there are no children

getComponentCountInLayer

public int getComponentCountInLayer(int layer)

Suppressed: Returns the number of children currently in the specified layer.

Parameters:

layer - an int specifying the layer to check

Returns:

an int specifying the number of components in that layer

getComponentsInLayer

public Component[] getComponentsInLayer(int layer)

Suppressed: Returns an array of the components in the specified layer.

Parameters:

layer - an int specifying the layer to check

Returns:

an array of Components contained in that layer

paint

public void paint(Graphics g)

Suppressed: Paints this JLayeredPane within the specified graphics context.

Overrides:

paint in class JComponent

Parameters:

g - the Graphics context within which to paint

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)

getComponentToLayer

protected Hashtable getComponentToLayer()

Returns the hashtable that maps components to layers.

Returns:

the Hashtable used to map components to their layers

getObjectForLayer

protected Integer getObjectForLayer(int layer)

Returns the Integer object associated with a specified layer.

Parameters:

layer - an int specifying the layer

Returns:

an Integer object for that layer

insertIndexForLayer

protected int insertIndexForLayer(int layer,
                                  int position)

Primitive method that determines the proper location to insert a new child based on layer and position requests.

Parameters:

layer - an int specifying the layer

position - an int specifying the position within the layer

Returns:

an int giving the (absolute) insertion-index

See Also:

getIndexOf(java.awt.Component)

paramString

protected String paramString()

Returns a string representation of this JLayeredPane. 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 JLayeredPane.

getAccessibleContext

public AccessibleContext getAccessibleContext()

Suppressed: Gets the AccessibleContext associated with this JLayeredPane. For layered panes, the AccessibleContext takes the form of an AccessibleJLayeredPane. A new AccessibleJLayeredPane instance is created if necessary.

Specified by:

getAccessibleContext in interface Accessible

Overrides:

getAccessibleContext in class JComponent

Returns:

an AccessibleJLayeredPane that serves as the AccessibleContext of this JLayeredPane