org.jdesktop.swingx

Class JXPanel

java.lang.Object

java.awt.Component

java.awt.Container

javax.swing.JComponent

javax.swing.JPanel

org.jdesktop.swingx.JXPanel

All Implemented Interfaces:

ImageObserver, MenuContainer, Serializable, Accessible, Scrollable

Direct Known Subclasses:

AbstractPatternPanel, GradientPreviewPanel, JXCollapsiblePane, JXGradientChooser, JXGraph, JXHeader, JXImageView, JXLoginPane, JXTaskPaneContainer, JXTipOfTheDay, JXTitledPanel, JXTitledSeparator, SpinningCalendarHeaderHandler.SpinningCalendarHeader, WrappingIconPanel

@JavaBean
public class JXPanel
extends JPanel
implements Scrollable

An extended JPanel that provides additional features.

Scrollable

JXPanel is Scrollable by default. It provides reasonable implementations of all of the interface methods. In addition, it supports the setting of common scrolling approaches defined in ScrollableSizeHint.

Alpha Support

JXPanel has full alpha-channel support. This means that the JXPanel can be made fully or partially transparent. This means that the JXPanel and all of its children will behave as a single paint at the specified alpha value. Cauton: best practice is to use either alpha support or opacity support, but not both. See the documentation on the methods for further information.

A transparency example, this following code will show the black background of the parent:

 JXPanel panel = new JXPanel();
 panel.add(new JButton("Push Me"));
 panel.setAlpha(.5f);
 
 container.setBackground(Color.BLACK);
 container.add(panel);
 

Painter Support

JXPanel has support for Painters.

A painter example, this following code will show how to add a simple painter:

 JXPanel panel = new JXPanel();
 panel.setBackgroundPainter(new PinstripePainter());
 

Author:

rbair

See Also:

Scrollable, Painter, Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class javax.swing.JPanel

JPanel.AccessibleJPanel

Nested classes/interfaces inherited from class javax.swing.JComponent

JComponent.AccessibleJComponent

Nested classes/interfaces inherited from class java.awt.Container

Container.AccessibleAWTContainer

Nested classes/interfaces inherited from class java.awt.Component

Component.AccessibleAWTComponent, Component.BaselineResizeBehavior, Component.BltBufferStrategy, Component.FlipBufferStrategy

Field Summary

Fields inherited from class javax.swing.JComponent

listenerList, TOOL_TIP_TEXT_KEY, ui, UNDEFINED_CONDITION, WHEN_ANCESTOR_OF_FOCUSED_COMPONENT, WHEN_FOCUSED, WHEN_IN_FOCUSED_WINDOW

Fields inherited from class java.awt.Component

accessibleContext, 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

Constructors

Constructor and Description
JXPanel() Creates a new JXPanel with a double buffer and a flow layout.
JXPanel(boolean isDoubleBuffered) Creates a new JXPanel with FlowLayout and the specified buffering strategy.
JXPanel(LayoutManager layout) Create a new buffered JXPanel with the specified layout manager
JXPanel(LayoutManager layout, boolean isDoubleBuffered) Creates a new JXPanel with the specified layout manager and buffering strategy.

Method Summary

Modifier and Type	Method and Description
float	getAlpha() Get the current alpha value.
Painter	getBackgroundPainter() Returns the current background painter.
float	getEffectiveAlpha() Unlike other properties, alpha can be set on a component, or on one of its parents.
protected PropertyChangeListener	getPainterChangeListener()
Dimension	getPreferredScrollableViewportSize()
int	getScrollableBlockIncrement(Rectangle visibleRect, int orientation, int direction)
protected ScrollableSizeHint	getScrollableHeightHint()
boolean	getScrollableTracksViewportHeight()
boolean	getScrollableTracksViewportWidth()
int	getScrollableUnitIncrement(Rectangle visibleRect, int orientation, int direction)
protected ScrollableSizeHint	getScrollableWidthHint()
protected boolean	isAlpha() Returns whether or not the container hierarchy below is transparent.
boolean	isInheritAlpha() Returns the state of the panel with respect to inheriting alpha values.
boolean	isOpaque()
protected boolean	isOpaquePatch()
boolean	isPaintBorderInsets() Returns true if the background painter should paint where the border is or false if it should only paint inside the border.
protected boolean	isPaintingBackground() Returns whether or not the background should be painted.
protected boolean	isPaintingOrigin()
protected boolean	isPatch()
protected boolean	isTransparentBackground() Returns whether or not the background is transparent.
void	paint(Graphics g) Overridden paint method to take into account the alpha setting.
protected void	paintComponent(Graphics g) Overridden to provide Painter support.
protected void	paintComponentPatch(Graphics g)
void	setAlpha(float alpha) Set the alpha transparency level for this component.
void	setBackgroundPainter(Painter p) Sets a Painter to use to paint the background of this JXPanel.
void	setInheritAlpha(boolean val) Determines if the effective alpha of this component should include the alpha of ancestors.
void	setOpaque(boolean opaque)
protected void	setOpaquePatch(boolean opaque)
void	setPaintBorderInsets(boolean paintBorderInsets) Sets the paintBorderInsets property.
void	setScrollableHeightHint(ScrollableSizeHint hint) Sets the vertical sizing hint.
void	setScrollableTracksViewportHeight(boolean scrollableTracksViewportHeight) Sets the vertical size tracking to either ScrollableSizeTrack.FIT or NONE, if the boolean parameter is true or false, respectively.
void	setScrollableTracksViewportWidth(boolean scrollableTracksViewportWidth) Sets the horizontal size tracking to either ScrollableSizeTrack.FIT or NONE, if the boolean parameter is true or false, respectively.
void	setScrollableWidthHint(ScrollableSizeHint hint) Sets the horizontal sizing hint.

Methods inherited from class javax.swing.JPanel

getAccessibleContext, getUI, getUIClassID, paramString, setUI, updateUI

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, hide, isDoubleBuffered, isLightweightComponent, isManagingFocus, isOptimizedDrawingEnabled, isPaintingForPrint, isPaintingTile, isRequestFocusEnabled, isValidateRoot, paintBorder, paintChildren, 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, 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, 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, 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, transferFocusBackward, transferFocusUpCycle

Methods inherited from class java.lang.Object

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

Constructor Detail

JXPanel

public JXPanel()

Creates a new JXPanel with a double buffer and a flow layout.

JXPanel

public JXPanel(boolean isDoubleBuffered)

Creates a new JXPanel with FlowLayout and the specified buffering strategy. If isDoubleBuffered is true, the JXPanel will use a double buffer.

Parameters:

isDoubleBuffered - a boolean, true for double-buffering, which uses additional memory space to achieve fast, flicker-free updates

JXPanel

public JXPanel(LayoutManager layout)

Create a new buffered JXPanel with the specified layout manager

Parameters:

layout - the LayoutManager to use

JXPanel

public JXPanel(LayoutManager layout,
               boolean isDoubleBuffered)

Creates a new JXPanel with the specified layout manager and buffering strategy.

Parameters:

layout - the LayoutManager to use

isDoubleBuffered - a boolean, true for double-buffering, which uses additional memory space to achieve fast, flicker-free updates

Method Detail

setOpaque

public void setOpaque(boolean opaque)

Setting the component to be opaque will reset the alpha setting to 1f (full opaqueness). Setting the component to be non-opaque will restore the previous alpha transparency. If the component is non-opaque with a fully-opaque alpha value (1f), the behavior should be the same as as a JPanel that is non-opaque.

Overrides:

setOpaque in class JComponent

isOpaque

public boolean isOpaque()

Overrides:

isOpaque in class JComponent

getAlpha

public float getAlpha()

Get the current alpha value.

Returns:

the alpha translucency level for this component. This will be a value between 0 and 1, inclusive.

setAlpha

public void setAlpha(float alpha)

Set the alpha transparency level for this component. This automatically causes a repaint of the component.

Parameters:

alpha - must be a value between 0 and 1 inclusive

getEffectiveAlpha

public float getEffectiveAlpha()

Unlike other properties, alpha can be set on a component, or on one of its parents. If the alpha of a parent component is .4, and the alpha on this component is .5, effectively the alpha for this component is .4 because the lowest alpha in the hierarchy "wins."

Returns:

the lowest alpha value in the hierarchy

isInheritAlpha

public boolean isInheritAlpha()

Returns the state of the panel with respect to inheriting alpha values.

Returns:

true if this panel inherits alpha values; false otherwise

See Also:

setInheritAlpha(boolean)

setInheritAlpha

public void setInheritAlpha(boolean val)

Determines if the effective alpha of this component should include the alpha of ancestors.

Parameters:

val - true to include ancestral alpha data; false otherwise

See Also:

isInheritAlpha(), getEffectiveAlpha()

setScrollableWidthHint

public final void setScrollableWidthHint(ScrollableSizeHint hint)

Sets the horizontal sizing hint. The hint is used by the Scrollable implementation to service the getScrollableTracksWidth.

Parameters:

hint - the horizontal sizing hint, must not be null and must be vertical.

Throws:

NullPointerException - if null

See Also:

setScrollableHeightHint(ScrollableSizeHint), ScrollableSizeHint

setScrollableHeightHint

public final void setScrollableHeightHint(ScrollableSizeHint hint)

Sets the vertical sizing hint. The hint is used by the Scrollable implementation to service the getScrollableTracksHeight.

Parameters:

hint - the vertical sizing hint, must not be null and must be vertical.

Throws:

NullPointerException - if null

See Also:

setScrollableWidthHint(ScrollableSizeHint), ScrollableSizeHint

getScrollableWidthHint

protected ScrollableSizeHint getScrollableWidthHint()

getScrollableHeightHint

protected ScrollableSizeHint getScrollableHeightHint()

getScrollableTracksViewportHeight

public boolean getScrollableTracksViewportHeight()

Specified by:

getScrollableTracksViewportHeight in interface Scrollable

getScrollableTracksViewportWidth

public boolean getScrollableTracksViewportWidth()

Specified by:

getScrollableTracksViewportWidth in interface Scrollable

getPreferredScrollableViewportSize

public Dimension getPreferredScrollableViewportSize()

Specified by:

getPreferredScrollableViewportSize in interface Scrollable

getScrollableBlockIncrement

public int getScrollableBlockIncrement(Rectangle visibleRect,
                                       int orientation,
                                       int direction)

Specified by:

getScrollableBlockIncrement in interface Scrollable

getScrollableUnitIncrement

public int getScrollableUnitIncrement(Rectangle visibleRect,
                                      int orientation,
                                      int direction)

Specified by:

getScrollableUnitIncrement in interface Scrollable

setScrollableTracksViewportHeight

public void setScrollableTracksViewportHeight(boolean scrollableTracksViewportHeight)

Sets the vertical size tracking to either ScrollableSizeTrack.FIT or NONE, if the boolean parameter is true or false, respectively.

NOTE: this method is kept for backward compatibility only, for full control use setScrollableHeightHint.

Parameters:

scrollableTracksViewportHeight - The scrollableTracksViewportHeight to set.

See Also:

setScrollableHeightHint(ScrollableSizeHint)

setScrollableTracksViewportWidth

public void setScrollableTracksViewportWidth(boolean scrollableTracksViewportWidth)

Sets the horizontal size tracking to either ScrollableSizeTrack.FIT or NONE, if the boolean parameter is true or false, respectively.

NOTE: this method is kept for backward compatibility only, for full control use setScrollableWidthHint.

Parameters:

scrollableTracksViewportWidth - The scrollableTracksViewportWidth to set.

See Also:

setScrollableWidthHint(ScrollableSizeHint)

setBackgroundPainter

public void setBackgroundPainter(Painter p)

Sets a Painter to use to paint the background of this JXPanel.

Parameters:

p - the new painter

See Also:

getBackgroundPainter()

getPainterChangeListener

protected PropertyChangeListener getPainterChangeListener()

Returns:

a listener for painter change events

getBackgroundPainter

public Painter getBackgroundPainter()

Returns the current background painter. The default value of this property is a painter which draws the normal JPanel background according to the current look and feel.

Returns:

the current painter

See Also:

setBackgroundPainter(Painter), isPaintBorderInsets()

isPaintBorderInsets

public boolean isPaintBorderInsets()

Returns true if the background painter should paint where the border is or false if it should only paint inside the border. This property is true by default. This property affects the width, height, and initial transform passed to the background painter.

Returns:

true to paint under the border; false otherwise

setPaintBorderInsets

public void setPaintBorderInsets(boolean paintBorderInsets)

Sets the paintBorderInsets property. Set to true if the background painter should paint where the border is or false if it should only paint inside the border. This property is true by default. This property affects the width, height, and initial transform passed to the background painter. This is a bound property.

isPaintingOrigin

protected boolean isPaintingOrigin()

Overrides:

isPaintingOrigin in class JComponent

paint

public void paint(Graphics g)

Overridden paint method to take into account the alpha setting.

Overrides:

paint in class JComponent

Parameters:

g - the Graphics context in which to paint

paintComponent

protected void paintComponent(Graphics g)

Overridden to provide Painter support. It will call backgroundPainter.paint() if it is not null, else it will call super.paintComponent().

Overrides:

paintComponent in class JComponent

Parameters:

g - the Graphics context in which to paint

isPatch

protected boolean isPatch()

paintComponentPatch

protected void paintComponentPatch(Graphics g)

isOpaquePatch

protected boolean isOpaquePatch()

setOpaquePatch

protected void setOpaquePatch(boolean opaque)

isAlpha

protected boolean isAlpha()

Returns whether or not the container hierarchy below is transparent.

Returns:

isTransparentBackground

protected boolean isTransparentBackground()

Returns whether or not the background is transparent.

Returns:

isPaintingBackground

protected boolean isPaintingBackground()

Returns whether or not the background should be painted.

Returns: