javax.swing
Class JLayeredPane
- Accessible, ImageObserver, MenuContainer, Serializable
A container that adds depth to the usual
Container semantics.
Each child component of a
Layered Pane is placed within one
of several layers.
JLayeredPane defines a set of standard
layers. The pre-defined sets are (in the order from button to top):
DEFAULT_LAYERPALETTE_LAYERMODAL_LAYERPOPUP_LAYERDRAG_LAYER
A child is in exactly one of these layers at any time, though there may
be other layers if someone creates them.
You can add a component to a specific layer using the
Container.add(Component,Object) method. I.e.
layeredPane.add(comp, JLayeredPane.MODAL_LAYER) will add the
component
comp to the modal layer of
layeredPane.
To change the layer of a component that is already a child of
a
JLayeredPane, use the
setLayer(Component,int)
method.
The purpose of this class is to translate this view of "layers" into a
contiguous array of components: the one held in our ancestor,
Container.
There is a precise set of words we will use to refer to numbers within
this class:
componentContainer[0 .. component.length)int
Note: the layer numbering order is the
reverse of the
component indexing and position order
protected Hashtable | Integer> getComponentToLayer()- Return a hashtable mapping child components of this container to
Integer objects representing the component's layer assignments.
|
protected void | addImpl(Component comp, Object layerConstraint, int index)- Overrides the default implementation from
Container
such that layerConstraint is interpreted as an Integer, specifying the layer to which the component will be added
(at the bottom position).
|
AccessibleContext | getAccessibleContext()- Returns the accessible context for this
JLayeredPane.
|
int | getComponentCountInLayer(int layer)- Return the number of components within a layer of this
container.
|
Component[] | getComponentsInLayer(int layer)- Return an array of all components within a layer of this
container.
|
int | getIndexOf(Component c)- Return the index of a component within the underlying (contiguous)
array of children.
|
int | getLayer(Component c)- Looks up the layer a child component is currently assigned to.
|
static int | getLayer(JComponent comp)- Looks up the layer in the client property with the key
LAYER_PROPERTY of comp.
|
static JLayeredPane | getLayeredPaneAbove(Component comp)- Returns the first JLayeredPane that contains the Component
comp or null if comp is
not contained in a JLayeredPane.
|
protected Integer | getObjectForLayer(int layer)- Return an Integer object which holds the same int value as the
parameter.
|
int | getPosition(Component c)- Return the position of a component within its layer.
|
int | highestLayer()- Return the greatest layer number currently in use, in this container.
|
protected int | insertIndexForLayer(int layer, int position)- Computes an index at which to request the superclass
Container inserts a component, given an abstract layer and
position number.
|
boolean | isOptimizedDrawingEnabled()- Returns
false if components in this layered pane can overlap,
otherwise true.
|
int | lowestLayer()- Return the least layer number currently in use, in this container.
|
void | moveToBack(Component c)- Moves a component to the "back" of its layer.
|
void | moveToFront(Component c)- Moves a component to the "front" of its layer.
|
void | paint(Graphics g)- This method is overridden order to provide a reasonable painting
mechanism for
JLayeredPane.
|
static void | putLayer(JComponent component, int layer)- Sets the layer property for a JComponent.
|
void | remove(int index)- Removes a child from this container.
|
void | removeAll()- Removes all components from this container.
|
void | setLayer(Component c, int layer)- Set the layer property for a component, within this container.
|
void | setLayer(Component c, int layer, int position)- Set the layer and position of a component, within this container.
|
void | setPosition(Component c, int position)- Change the position of a component within its layer.
|
addAncestorListener, addNotify, addVetoableChangeListener, computeVisibleRect, contains, createToolTip, disable, enable, extends EventListener> T[] getListeners, firePropertyChange, firePropertyChange, fireVetoableChange, getAccessibleContext, getActionForKeyStroke, getActionMap, getAlignmentX, getAlignmentY, getAncestorListeners, getAutoscrolls, getBorder, getBounds, getClientProperty, getComponentGraphics, getComponentPopupMenu, getConditionForKeyStroke, getDebugGraphicsOptions, getDefaultLocale, getGraphics, getHeight, getInheritsPopupMenu, getInputMap, getInputMap, getInputVerifier, getInsets, getInsets, getLocation, getMaximumSize, getMinimumSize, getNextFocusableComponent, getPreferredSize, getRegisteredKeyStrokes, getRootPane, getSize, getToolTipLocation, getToolTipText, getToolTipText, getTopLevelAncestor, getTransferHandler, getUIClassID, getVerifyInputWhenFocusTarget, getVetoableChangeListeners, getVisibleRect, getWidth, getX, getY, grabFocus, isDoubleBuffered, isLightweightComponent, isManagingFocus, isOpaque, isOptimizedDrawingEnabled, isPaintingTile, isRequestFocusEnabled, isValidateRoot, paint, paintBorder, paintChildren, paintComponent, paintImmediately, paintImmediately, paramString, print, printAll, printBorder, printChildren, printComponent, processComponentKeyEvent, processKeyBinding, processKeyEvent, 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, setFont, setForeground, setInheritsPopupMenu, setInputMap, setInputVerifier, setNextFocusableComponent, setOpaque, setRequestFocusEnabled, setToolTipText, setTransferHandler, setUI, setVerifyInputWhenFocusTarget, setVisible, unregisterKeyboardAction, update, updateUI |
add, add, add, add, add, addContainerListener, addImpl, addNotify, addPropertyChangeListener, addPropertyChangeListener, applyComponentOrientation, areFocusTraversalKeysSet, countComponents, deliverEvent, doLayout, extends EventListener> T[] getListeners, findComponentAt, findComponentAt, getAlignmentX, getAlignmentY, getComponent, getComponentAt, getComponentAt, getComponentCount, getComponentZOrder, getComponents, getContainerListeners, getFocusTraversalKeys, getFocusTraversalPolicy, getInsets, getLayout, getMaximumSize, getMinimumSize, getPreferredSize, insets, invalidate, isAncestorOf, isFocusCycleRoot, isFocusCycleRoot, isFocusTraversalPolicyProvider, isFocusTraversalPolicySet, layout, list, list, locate, minimumSize, paint, paintComponents, paramString, preferredSize, print, printComponents, processContainerEvent, processEvent, remove, remove, removeAll, removeContainerListener, removeNotify, setComponentZOrder, setFocusCycleRoot, setFocusTraversalKeys, setFocusTraversalPolicy, setFocusTraversalPolicyProvider, setFont, setLayout, transferFocusDownCycle, update, validate, validateTree |
action, add, addComponentListener, addFocusListener, addHierarchyBoundsListener, addHierarchyListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, addMouseWheelListener, addNotify, addPropertyChangeListener, addPropertyChangeListener, applyComponentOrientation, areFocusTraversalKeysSet, bounds, checkImage, checkImage, coalesceEvents, contains, contains, createImage, createImage, createVolatileImage, createVolatileImage, deliverEvent, disable, disableEvents, dispatchEvent, doLayout, enable, enable, enableEvents, enableInputMethods, extends EventListener> T[] getListeners, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, getAccessibleContext, getAlignmentX, getAlignmentY, getBackground, getBounds, getBounds, getColorModel, getComponentAt, getComponentAt, getComponentListeners, getComponentOrientation, getCursor, getDropTarget, getFocusCycleRootAncestor, getFocusListeners, getFocusTraversalKeys, getFocusTraversalKeysEnabled, getFont, getFontMetrics, getForeground, getGraphics, getGraphicsConfiguration, getHeight, getHierarchyBoundsListeners, getHierarchyListeners, getIgnoreRepaint, getInputContext, getInputMethodListeners, getInputMethodRequests, getKeyListeners, getLocale, getLocation, getLocation, getLocationOnScreen, getMaximumSize, getMinimumSize, getMouseListeners, getMouseMotionListeners, getMouseWheelListeners, getName, getParent, getPeer, getPreferredSize, getPropertyChangeListeners, getPropertyChangeListeners, getSize, getSize, getToolkit, getTreeLock, getWidth, getX, getY, gotFocus, handleEvent, hasFocus, hide, imageUpdate, inside, invalidate, isBackgroundSet, isCursorSet, isDisplayable, isDoubleBuffered, isEnabled, isFocusCycleRoot, isFocusOwner, isFocusTraversable, isFocusable, isFontSet, isForegroundSet, isLightweight, isMaximumSizeSet, isMinimumSizeSet, isOpaque, isPreferredSizeSet, isShowing, isValid, isVisible, keyDown, keyUp, layout, list, list, list, list, list, locate, location, lostFocus, minimumSize, mouseDown, mouseDrag, mouseEnter, mouseExit, mouseMove, mouseUp, move, nextFocus, paint, paintAll, paramString, postEvent, preferredSize, prepareImage, prepareImage, print, printAll, processComponentEvent, processEvent, processFocusEvent, processHierarchyBoundsEvent, processHierarchyEvent, processInputMethodEvent, processKeyEvent, processMouseEvent, processMouseMotionEvent, processMouseWheelEvent, remove, removeComponentListener, removeFocusListener, removeHierarchyBoundsListener, removeHierarchyListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removeMouseWheelListener, removeNotify, removePropertyChangeListener, removePropertyChangeListener, repaint, repaint, repaint, repaint, requestFocus, requestFocus, requestFocusInWindow, requestFocusInWindow, reshape, resize, resize, setBackground, setBounds, setBounds, setComponentOrientation, setCursor, setDropTarget, setEnabled, setFocusTraversalKeys, setFocusTraversalKeysEnabled, setFocusable, setFont, setForeground, setIgnoreRepaint, setLocale, setLocation, setLocation, setMaximumSize, setMinimumSize, setName, setPreferredSize, setSize, setSize, setVisible, show, show, size, toString, transferFocus, transferFocusBackward, transferFocusUpCycle, update, validate |
clone, equals, extends Object> getClass, finalize, hashCode, notify, notifyAll, toString, wait, wait, wait |
JLayeredPane
public JLayeredPane()
Creates a new JComponent instance.
Integer> getComponentToLayer
protected HashtableInteger> getComponentToLayer()
Return a hashtable mapping child components of this container to
Integer objects representing the component's layer assignments.
addImpl
protected void addImpl(Component comp,
Object layerConstraint,
int index) Overrides the default implementation from
Container
such that
layerConstraint is interpreted as an
Integer, specifying the layer to which the component will be added
(at the bottom position).
The argument
index specifies the position within the layer
at which the component should be added, where
0 is the top
position greater values specify positions below that and
-1
specifies the bottom position.
- addImpl in interface Container
comp - the component to addlayerConstraint - an integer specifying the layer to add the
component toindex - the position within the layer
getComponentCountInLayer
public int getComponentCountInLayer(int layer)
Return the number of components within a layer of this
container.
layer - the layer count components in
- the number of components in the layer
getComponentsInLayer
public Component[] getComponentsInLayer(int layer)
Return an array of all components within a layer of this
container. Components are ordered front-to-back, with the "front"
element (which draws last) at position 0 of the returned array.
layer - the layer to return components from
- the components in the layer
getIndexOf
public int getIndexOf(Component c)
Return the index of a component within the underlying (contiguous)
array of children. This is a "raw" number which does not represent the
child's position in a layer, but rather its position in the logical
drawing order of all children of the container.
c - the component to look up.
- the external index of the component or
-1 if
c is not a child of this layered pane
getLayer
public int getLayer(Component c)
Looks up the layer a child component is currently assigned to.
If
c is an instance of
JComponent, then the layer
is fetched from the client property with the key
LAYER_PROPERTY.
Otherwise it is looked up in an internal hashtable that maps
non-JComponent components to layers. If the components cannot be found
in either way, the
DEFAULT_LAYER is returned.
c - the component to look up.
- the layer the component is currently assigned to; if the component
is not in this layered pane, then 0 (DEFAULT_LAYER) is returned
getLayer
public static int getLayer(JComponent comp)
Looks up the layer in the client property with the key
LAYER_PROPERTY of
comp. If no such property can be
found, we return
0 (
DEFAULT_LAYER).
comp - the component for which the layer is looked up
- the layer of
comp as stored in the corresponding
client property, or 0 if there is no such property
getLayeredPaneAbove
public static JLayeredPane getLayeredPaneAbove(Component comp)
Returns the first JLayeredPane that contains the Component
comp or null if comp is
not contained in a JLayeredPane.
comp - the component for which we are searching the JLayeredPane
ancestor
- the first JLayeredPane that contains the Component
comp or null if comp is
not contained in a JLayeredPane
getObjectForLayer
protected Integer getObjectForLayer(int layer)
Return an Integer object which holds the same int value as the
parameter. This is strictly an optimization to minimize the number of
identical Integer objects which we allocate.
layer - the layer number as an int.
- the layer number as an Integer, possibly shared.
getPosition
public int getPosition(Component c)
Return the position of a component within its layer. Positions are assigned
from the "front" (position 0) to the "back" (position N-1), and drawn from
the back towards the front.
c - the component to get the position of
- the position of
c within its layer or -1 if
c is not a child of this layered pane
highestLayer
public int highestLayer()
Return the greatest layer number currently in use, in this container.
This number may legally be positive or negative.
insertIndexForLayer
protected int insertIndexForLayer(int layer,
int position) Computes an index at which to request the superclass
Container inserts a component, given an abstract layer and
position number.
layer - the layer in which to insert a component.position - the position in the layer at which to insert a component.
- the index at which to insert the component.
lowestLayer
public int lowestLayer()
Return the least layer number currently in use, in this container.
This number may legally be positive or negative.
moveToBack
public void moveToBack(Component c)
Moves a component to the "back" of its layer. The "back" is a
synonym for position N-1 (also known as position -1), where N is the
size of the layer.
The "back" of a layer is the first position drawn, so the component at
the "back" is usually the component which is occluded by the most
other components in its layer.
c - the component to move to the back of its layer.
moveToFront
public void moveToFront(Component c)
Moves a component to the "front" of its layer. The "front" is a
synonym for position 0, which is also the last position drawn in each
layer, so is usually the component which occludes the most other
components in its layer.
c - the component to move to the front of its layer
paint
public void paint(Graphics g)
This method is overridden order to provide a reasonable painting
mechanism for JLayeredPane. This is necessary since
JLayeredPane's do not have an own UI delegate.
Basically this method clears the background for the
JLayeredPane and then calls super.paint(g).
- paint in interface JComponent
g - the graphics context to use
putLayer
public static void putLayer(JComponent component,
int layer) Sets the layer property for a JComponent.
component - the component for which to set the layerlayer - the layer property to set
remove
public void remove(int index)
Removes a child from this container. The child is specified by
index. After removal, the child no longer occupies a layer.
- remove in interface Container
index - the index of the child component to remove.
setLayer
public void setLayer(Component c,
int layer) Set the layer property for a component, within this container. The
component will be implicitly mapped to the bottom-most position in the
layer, but only if added
after calling this method.
Read that carefully: this method should be called
before the
component is added to the container.
c - the component to set the layer property for.layer - the layer number to assign to the component.
setLayer
public void setLayer(Component c,
int layer,
int position) Set the layer and position of a component, within this container.
c - the child component to set the layer property for.layer - the layer number to assign to the component.position - the position number to assign to the component.
setPosition
public void setPosition(Component c,
int position) Change the position of a component within its layer. Positions are assigned
from the "front" (position 0) to the "back" (position N-1), and drawn from
the back towards the front.
c - the component to change the position ofposition - the position to assign the component to
JLayeredPane.java --
Copyright (C) 2002, 2004 Free Software Foundation, Inc.
This file is part of GNU Classpath.
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it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
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