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/*
* $Id$
*
* Copyright 2004 Sun Microsystems, Inc., 4150 Network Circle,
* Santa Clara, California 95054, U.S.A. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
package org.jdesktop.swingx;
import static org.jdesktop.swingx.util.GraphicsUtilities.createCompatibleTranslucentImage;
import java.awt.AlphaComposite;
import java.awt.Component;
import java.awt.Composite;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Insets;
import java.awt.LayoutManager;
import java.awt.Rectangle;
import java.awt.image.BufferedImage;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.util.logging.Logger;
import javax.swing.JPanel;
import javax.swing.RepaintManager;
import javax.swing.Scrollable;
import javax.swing.SwingConstants;
import javax.swing.UIManager;
import javax.swing.plaf.synth.SynthLookAndFeel;
import org.jdesktop.beans.JavaBean;
import org.jdesktop.swingx.painter.AbstractPainter;
import org.jdesktop.swingx.painter.Painter;
import org.jdesktop.swingx.util.Contract;
import org.jdesktop.swingx.util.JVM;
/**
*
* An extended {@code JPanel} that provides additional features.
*
* Scrollable
*
* {@code JXPanel} is {@link 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 {@link ScrollableSizeHint}.
*
* Alpha Support
*
* {@code JXPanel} has full alpha-channel support. This means that the {@code 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
*
* {@code JXPanel} has support for {@linkplain Painter}s.
*
*
* 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 Scrollable
* @see Painter
*/
@JavaBean
@SuppressWarnings("nls")
public class JXPanel extends JPanel implements AlphaPaintable, BackgroundPaintable, Scrollable {
private final boolean isJava7Orhigher = JVM.current().isOrLater(JVM.JDK1_7);
private ScrollableSizeHint scrollableWidthHint = ScrollableSizeHint.FIT;
private ScrollableSizeHint scrollableHeightHint = ScrollableSizeHint.FIT;
/**
* The alpha level for this component.
*/
private volatile float alpha = 1.0f;
/**
* If the old alpha value was 1.0, I keep track of the opaque setting because
* a translucent component is not opaque, but I want to be able to restore
* opacity to its default setting if the alpha is 1.0. Honestly, I don't know
* if this is necessary or not, but it sounded good on paper :)
* TODO: Check whether this variable is necessary or not
*/
private boolean oldOpaque;
private float oldAlpha = 1f;
/**
* Indicates whether this component should inherit its parent alpha value
*/
private boolean inheritAlpha = true;
/**
* Specifies the Painter to use for painting the background of this panel.
* If no painter is specified, the normal painting routine for JPanel
* is called. Old behavior is also honored for the time being if no
* backgroundPainter is specified
*/
@SuppressWarnings("rawtypes")
private Painter backgroundPainter;
private boolean paintBorderInsets = true;
/**
* The listener installed on the current backgroundPainter, if any.
*/
private PropertyChangeListener painterChangeListener;
/**
* Creates a new JXPanel with a double buffer
* and a flow layout.
*/
public JXPanel() {
}
/**
* Creates a new JXPanel with FlowLayout
* and the specified buffering strategy.
* If isDoubleBuffered is true, the JXPanel
* will use a double buffer.
*
* @param isDoubleBuffered a boolean, true for double-buffering, which
* uses additional memory space to achieve fast, flicker-free
* updates
*/
public JXPanel(boolean isDoubleBuffered) {
super(isDoubleBuffered);
}
/**
* Create a new buffered JXPanel with the specified layout manager
*
* @param layout the LayoutManager to use
*/
public JXPanel(LayoutManager layout) {
super(layout);
}
/**
* Creates a new JXPanel with the specified layout manager and buffering
* strategy.
*
* @param layout the LayoutManager to use
* @param isDoubleBuffered a boolean, true for double-buffering, which
* uses additional memory space to achieve fast, flicker-free
* updates
*/
public JXPanel(LayoutManager layout, boolean isDoubleBuffered) {
super(layout, isDoubleBuffered);
}
/**
* {@inheritDoc}
*
* Setting the component to be opaque will reset the alpha setting to {@code 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 ({@code 1f}),
* the behavior should be the same as as a {@code JPanel} that is non-opaque.
*/
@Override
public void setOpaque(boolean opaque) {
if (opaque) {
oldAlpha = getAlpha();
if (oldAlpha < 1f) {
setAlpha(1f);
} else {
super.setOpaque(true);
repaint();
}
} else if (getAlpha() == 1f) {
if (oldAlpha == 1f) {
super.setOpaque(false);
repaint();
} else {
setAlpha(oldAlpha);
}
}
}
@Override
public boolean isOpaque() {
return super.isOpaque();
}
/**
* {@inheritDoc}
*/
@Override
public float getAlpha() {
return alpha;
}
/**
* {@inheritDoc}
*/
@Override
public void setAlpha(float alpha) {
if (alpha < 0f || alpha > 1f) {
throw new IllegalArgumentException("invalid alpha value " + alpha);
}
float oldValue = getAlpha();
this.alpha = alpha;
if (getAlpha() < 1f) {
if (oldValue == 1) {
//it used to be 1, but now is not. Save the oldOpaque
oldOpaque = isOpaque();
super.setOpaque(false);
}
installRepaintManager();
} else {
uninstallRepaintManager();
//restore the oldOpaque if it was true (since opaque is false now)
if (oldOpaque) {
super.setOpaque(true);
}
}
firePropertyChange("alpha", oldValue, getAlpha());
repaint();
}
void installRepaintManager() {
if (!isJava7Orhigher) {
RepaintManager manager = RepaintManager.currentManager(this);
RepaintManager trm = SwingXUtilities.getTranslucentRepaintManager(manager);
RepaintManager.setCurrentManager(trm);
}
}
void uninstallRepaintManager() {
//TODO uninstall TranslucentRepaintManager when no more non-opaque JXPanel's exist
}
/**
* {@inheritDoc}
*/
@Override
public float getEffectiveAlpha() {
float a = getAlpha();
if (isInheritAlpha()) {
for (Component c = getParent(); c != null; c = c.getParent()) {
if (c instanceof AlphaPaintable) {
a = Math.min(((AlphaPaintable) c).getEffectiveAlpha(), a);
break;
}
}
}
return a;
}
/**
* {@inheritDoc}
*/
@Override
public boolean isInheritAlpha() {
return inheritAlpha;
}
/**
* {@inheritDoc}
*/
@Override
public void setInheritAlpha(boolean val) {
boolean oldValue = isInheritAlpha();
inheritAlpha = val;
firePropertyChange("inheritAlpha", oldValue, isInheritAlpha());
}
/**
* Sets the horizontal sizing hint. The hint is used by the Scrollable implementation
* to service the getScrollableTracksWidth.
*
* @param hint the horizontal sizing hint, must not be null
* and must be vertical.
*
* @throws NullPointerException if null
*
* @see #setScrollableHeightHint(ScrollableSizeHint)
* @see ScrollableSizeHint
*/
public final void setScrollableWidthHint(ScrollableSizeHint hint) {
Contract.asNotNull(hint, "hint cannot be null");
ScrollableSizeHint oldValue = getScrollableWidthHint();
if (oldValue == hint) return;
this.scrollableWidthHint = hint;
revalidate();
firePropertyChange("scrollableWidthHint", oldValue, getScrollableWidthHint());
}
/**
* Sets the vertical sizing hint. The hint is used by the Scrollable implementation
* to service the getScrollableTracksHeight.
*
* @param hint the vertical sizing hint, must not be null
* and must be vertical.
*
* @throws NullPointerException if null
*
* @see #setScrollableWidthHint(ScrollableSizeHint)
* @see ScrollableSizeHint
*/
public final void setScrollableHeightHint(ScrollableSizeHint hint) {
Contract.asNotNull(hint, "hint cannot be null");
ScrollableSizeHint oldValue = getScrollableHeightHint();
if (oldValue == hint) return;
this.scrollableHeightHint = hint;
revalidate();
firePropertyChange("scrollableHeightHint", oldValue, getScrollableHeightHint());
}
protected ScrollableSizeHint getScrollableWidthHint() {
return scrollableWidthHint;
}
protected ScrollableSizeHint getScrollableHeightHint() {
return scrollableHeightHint;
}
/**
* {@inheritDoc}
*/
@Override
public boolean getScrollableTracksViewportHeight() {
return scrollableHeightHint.getTracksParentSize(this, SwingConstants.VERTICAL);
}
/**
* {@inheritDoc}
*/
@Override
public boolean getScrollableTracksViewportWidth() {
return scrollableWidthHint.getTracksParentSize(this, SwingConstants.HORIZONTAL);
}
/**
* {@inheritDoc}
*/
@Override
public Dimension getPreferredScrollableViewportSize() {
return getPreferredSize();
}
/**
* {@inheritDoc}
*/
@Override
public int getScrollableBlockIncrement(Rectangle visibleRect, int orientation, int direction) {
if (orientation == SwingConstants.VERTICAL) {
return visibleRect.height;
} else if (orientation == SwingConstants.HORIZONTAL) {
return visibleRect.width;
} else {
throw new IllegalArgumentException("invalid orientation"); //$NON-NLS-1$
}
}
/**
* {@inheritDoc}
*/
@Override
public int getScrollableUnitIncrement(Rectangle visibleRect, int orientation, int direction) {
return getScrollableBlockIncrement(visibleRect, orientation, direction) / 10;
}
/**
*
* 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.
*
* @param scrollableTracksViewportHeight The scrollableTracksViewportHeight to set.
*
* @see #setScrollableHeightHint(ScrollableSizeHint)
*/
public void setScrollableTracksViewportHeight(boolean scrollableTracksViewportHeight) {
setScrollableHeightHint(scrollableTracksViewportHeight ?
ScrollableSizeHint.FIT : ScrollableSizeHint.NONE);
}
/**
* 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.
*
*
* @param scrollableTracksViewportWidth The scrollableTracksViewportWidth to set.
*
* @see #setScrollableWidthHint(ScrollableSizeHint)
*/
public void setScrollableTracksViewportWidth(boolean scrollableTracksViewportWidth) {
setScrollableWidthHint(scrollableTracksViewportWidth ?
ScrollableSizeHint.FIT : ScrollableSizeHint.NONE);
}
/**
* Sets a Painter to use to paint the background of this JXPanel.
*
* @param p the new painter
* @see #getBackgroundPainter()
*/
@Override
public void setBackgroundPainter(Painter p) {
Painter old = getBackgroundPainter();
if (old instanceof AbstractPainter) {
((AbstractPainter) old).removePropertyChangeListener(painterChangeListener);
}
backgroundPainter = p;
if (backgroundPainter instanceof AbstractPainter) {
((AbstractPainter) backgroundPainter).addPropertyChangeListener(getPainterChangeListener());
}
firePropertyChange("backgroundPainter", old, getBackgroundPainter());
repaint();
}
/**
* @return a listener for painter change events
*/
protected PropertyChangeListener getPainterChangeListener() {
if (painterChangeListener == null) {
painterChangeListener = new PropertyChangeListener() {
@Override
public void propertyChange(PropertyChangeEvent evt) {
repaint();
}
};
}
return painterChangeListener;
}
/**
* 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.
* @return the current painter
* @see #setBackgroundPainter(Painter)
* @see #isPaintBorderInsets()
*/
@Override
public Painter getBackgroundPainter() {
return backgroundPainter;
}
/**
* 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.
*/
@Override
public boolean isPaintBorderInsets() {
return 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.
*/
@Override
public void setPaintBorderInsets(boolean paintBorderInsets) {
boolean old = this.isPaintBorderInsets();
this.paintBorderInsets = paintBorderInsets;
firePropertyChange("paintBorderInsets", old, isPaintBorderInsets());
}
//support for Java 7 painting improvements
protected boolean isPaintingOrigin() {
return getAlpha() < 1f;
}
/**
* Overridden paint method to take into account the alpha setting.
*
* @param g
* the Graphics context in which to paint
*/
@Override
public void paint(Graphics g) {
//short circuit painting if no transparency
if (getAlpha() == 1f) {
super.paint(g);
} else if(isJava7Orhigher) {
Graphics2D g2d = (Graphics2D)g;
Composite oldComp = g2d.getComposite();
try {
float alpha = getEffectiveAlpha();
Composite alphaComp = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, alpha);
g2d.setComposite(alphaComp);
super.paint(g2d);
} finally {
g2d.setComposite(oldComp);
}
} else {
//the component is translucent, so we need to render to
//an intermediate image before painting
// TODO should we cache this image? repaint to same image unless size changes?
BufferedImage img = createCompatibleTranslucentImage(getWidth(), getHeight());
Graphics2D gfx = img.createGraphics();
try {
super.paint(gfx);
} finally {
gfx.dispose();
}
Graphics2D g2d = (Graphics2D) g;
Composite oldComp = g2d.getComposite();
try {
Composite alphaComp = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, getEffectiveAlpha());
g2d.setComposite(alphaComp);
//TODO should we cache the image?
g2d.drawImage(img, null, 0, 0);
} finally {
g2d.setComposite(oldComp);
}
}
}
/**
* Overridden to provide Painter support. It will call backgroundPainter.paint()
* if it is not null, else it will call super.paintComponent().
*
* @param g
* the Graphics context in which to paint
*/
@Override
@SuppressWarnings("unchecked")
protected void paintComponent(Graphics g) {
Graphics2D g2 = (Graphics2D) g.create();
try {
// we should be painting the background behind the painter if we have one
// this prevents issues with buffer reuse where visual artifacts sneak in
if (isOpaque() || UIManager.getLookAndFeel() instanceof SynthLookAndFeel) {
//this will paint the foreground if a JXPanel subclass is
//unfortunate enough to have one
super.paintComponent(g2);
}else if (getAlpha() < 1f) {
g.setColor(getBackground());
g.fillRect(0, 0, getWidth(), getHeight());
}
if (getBackgroundPainter() != null) {
if (isPaintBorderInsets()) {
getBackgroundPainter().paint(g2, this, getWidth(), getHeight());
} else {
Insets insets = getInsets();
g.translate(insets.left, insets.top);
getBackgroundPainter().paint(g2, this, getWidth() - insets.left - insets.right,
getHeight() - insets.top - insets.bottom);
g.translate(-insets.left, -insets.top);
}
}
//force the foreground to paint again...workaround for folks that
//incorrectly extend JXPanel instead of JComponent
getUI().paint(g2, this);
} finally {
g2.dispose();
}
}
@SuppressWarnings("unused")
private static final Logger LOG = Logger.getLogger(JXPanel.class.getName());
}