/*
* Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code 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 General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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*/
package javax.swing.plaf.synth;
import java.beans.*;
import javax.swing.*;
import javax.swing.plaf.*;
import java.awt.*;
/**
* Provides the Synth L&F UI delegate for
* {@link javax.swing.JViewport}.
*
* @since 1.7
*/
public class SynthViewportUI extends ViewportUI
implements PropertyChangeListener, SynthUI {
private SynthStyle style;
/**
* Creates a new UI object for the given component.
*
* @param c component to create UI object for
* @return the UI object
*/
public static ComponentUI createUI(JComponent c) {
return new SynthViewportUI();
}
/**
* @inheritDoc
*/
@Override
public void installUI(JComponent c) {
super.installUI(c);
installDefaults(c);
installListeners(c);
}
/**
* @inheritDoc
*/
@Override
public void uninstallUI(JComponent c) {
super.uninstallUI(c);
uninstallListeners(c);
uninstallDefaults(c);
}
/**
* Installs defaults for a viewport.
*
* @param c a {@code JViewport} object
*/
protected void installDefaults(JComponent c) {
updateStyle(c);
}
private void updateStyle(JComponent c) {
SynthContext context = getContext(c, ENABLED);
// Note: JViewport is special cased as it does not allow for
// a border to be set. JViewport.setBorder is overriden to throw
// an IllegalArgumentException. Refer to SynthScrollPaneUI for
// details of this.
SynthStyle newStyle = SynthLookAndFeel.getStyle(context.getComponent(),
context.getRegion());
SynthStyle oldStyle = context.getStyle();
if (newStyle != oldStyle) {
if (oldStyle != null) {
oldStyle.uninstallDefaults(context);
}
context.setStyle(newStyle);
newStyle.installDefaults(context);
}
this.style = newStyle;
context.dispose();
}
/**
* Installs listeners into the viewport.
*
* @param c a {@code JViewport} object
*/
protected void installListeners(JComponent c) {
c.addPropertyChangeListener(this);
}
/**
* Uninstalls listeners from the viewport.
*
* @param c a {@code JViewport} object
*/
protected void uninstallListeners(JComponent c) {
c.removePropertyChangeListener(this);
}
/**
* Uninstalls defaults from a viewport.
*
* @param c a {@code JViewport} object
*/
protected void uninstallDefaults(JComponent c) {
SynthContext context = getContext(c, ENABLED);
style.uninstallDefaults(context);
context.dispose();
style = null;
}
/**
* @inheritDoc
*/
@Override
public SynthContext getContext(JComponent c) {
return getContext(c, SynthLookAndFeel.getComponentState(c));
}
private SynthContext getContext(JComponent c, int state) {
return SynthContext.getContext(SynthContext.class, c,
getRegion(c), style, state);
}
private Region getRegion(JComponent c) {
return SynthLookAndFeel.getRegion(c);
}
/**
* Notifies this UI delegate to repaint the specified component.
* This method paints the component background, then calls
* the {@link #paint(SynthContext,Graphics)} method.
*
* <p>In general, this method does not need to be overridden by subclasses.
* All Look and Feel rendering code should reside in the {@code paint} method.
*
* @param g the {@code Graphics} object used for painting
* @param c the component being painted
* @see #paint(SynthContext,Graphics)
*/
@Override
public void update(Graphics g, JComponent c) {
SynthContext context = getContext(c);
SynthLookAndFeel.update(context, g);
context.getPainter().paintViewportBackground(context,
g, 0, 0, c.getWidth(), c.getHeight());
paint(context, g);
context.dispose();
}
/**
* Paints the border. The method is never called,
* because the {@code JViewport} class does not support a border.
* This implementation does nothing.
*
* @param context a component context
* @param g the {@code Graphics} to paint on
* @param x the X coordinate
* @param y the Y coordinate
* @param w width of the border
* @param h height of the border
*/
@Override
public void paintBorder(SynthContext context, Graphics g, int x,
int y, int w, int h) {
}
/**
* Paints the specified component according to the Look and Feel.
* <p>This method is not used by Synth Look and Feel.
* Painting is handled by the {@link #paint(SynthContext,Graphics)} method.
*
* @param g the {@code Graphics} object used for painting
* @param c the component being painted
* @see #paint(SynthContext,Graphics)
*/
@Override
public void paint(Graphics g, JComponent c) {
SynthContext context = getContext(c);
paint(context, g);
context.dispose();
}
/**
* Paints the specified component. This implementation does nothing.
*
* @param context context for the component being painted
* @param g the {@code Graphics} object used for painting
* @see #update(Graphics,JComponent)
*/
protected void paint(SynthContext context, Graphics g) {
}
/**
* @inheritDoc
*/
@Override
public void propertyChange(PropertyChangeEvent e) {
if (SynthLookAndFeel.shouldUpdateStyle(e)) {
updateStyle((JComponent)e.getSource());
}
}
}