/*
* Copyright (c) 2009 Kathryn Huxtable and Kenneth Orr.
*
* This file is part of the SeaGlass Pluggable Look and Feel.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* $Id: SeaGlassViewportUI.java 1595 2011-08-09 20:33:48Z rosstauscher@gmx.de $
*/
package com.seaglasslookandfeel.ui;
import java.awt.Component;
import java.awt.Graphics;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import javax.swing.JComponent;
import javax.swing.JViewport;
import javax.swing.plaf.ComponentUI;
import javax.swing.plaf.ViewportUI;
import javax.swing.plaf.synth.Region;
import javax.swing.plaf.synth.SynthContext;
import javax.swing.plaf.synth.SynthLookAndFeel;
import javax.swing.plaf.synth.SynthStyle;
import com.seaglasslookandfeel.SeaGlassContext;
import com.seaglasslookandfeel.SeaGlassLookAndFeel;
import com.seaglasslookandfeel.painter.ViewportPainter;
/**
* SeaGlassViewportUI implementation.
*
* Based on SynthViewPortUI, which is package local.
*
* @see javax.swing.plaf.synth.SynthViewportUI
*/
public class SeaGlassViewportUI extends ViewportUI implements PropertyChangeListener, SeaglassUI {
private SynthStyle style;
public static ComponentUI createUI(JComponent c) {
return new SeaGlassViewportUI();
}
public void installUI(JComponent c) {
super.installUI(c);
installDefaults(c);
installListeners(c);
}
public void uninstallUI(JComponent c) {
super.uninstallUI(c);
uninstallListeners(c);
uninstallDefaults(c);
}
protected void installDefaults(JComponent c) {
updateStyle(c);
}
private void updateStyle(JComponent c) {
SeaGlassContext 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();
}
protected void installListeners(JComponent c) {
c.addPropertyChangeListener(this);
}
protected void uninstallListeners(JComponent c) {
c.removePropertyChangeListener(this);
}
protected void uninstallDefaults(JComponent c) {
SeaGlassContext context = getContext(c, ENABLED);
style.uninstallDefaults(context);
context.dispose();
style = null;
}
public SeaGlassContext getContext(JComponent c) {
return getContext(c, getComponentState(c));
}
private SeaGlassContext getContext(JComponent c, int state) {
return SeaGlassContext.getContext(SeaGlassContext.class, c, getRegion(c), style, state);
}
private Region getRegion(JComponent c) {
return SynthLookAndFeel.getRegion(c);
}
private int getComponentState(JComponent c) {
return SeaGlassLookAndFeel.getComponentState(c);
}
public void update(Graphics g, JComponent c) {
SeaGlassContext context = getContext(c);
SeaGlassLookAndFeel.update(context, g);
context.getPainter().paintViewportBackground(context, g, 0, 0, c.getWidth(), c.getHeight());
paint(context, g);
context.dispose();
}
public void paintBorder(SynthContext context, Graphics g, int x, int y, int w, int h) {
// This does nothing on purpose, JViewport doesn't allow a border
// and therefor this will NEVER be called.
}
public void paint(Graphics g, JComponent c) {
SeaGlassContext context = getContext(c);
paint(context, g);
context.dispose();
}
protected void paint(SeaGlassContext context, Graphics g) {
JComponent c = context.getComponent();
JViewport viewport = (JViewport) c;
if (c.isOpaque()) {
Component view = viewport.getView();
Object ui = (view == null) ? null : invokeGetter(view, "getUI", null);
if (ui instanceof ViewportPainter) {
((ViewportPainter) ui).paintViewport(context, g, viewport);
} else {
if (viewport.getView() != null) {
g.setColor(viewport.getView().getBackground());
g.fillRect(0, 0, c.getWidth(), c.getHeight());
}
}
}
}
/**
* Invokes the specified getter method if it exists.
*
* @param obj
* The object on which to invoke the method.
* @param methodName
* The name of the method.
* @param defaultValue
* This value is returned, if the method does not exist.
* @return The value returned by the getter method or the default value.
*/
private static Object invokeGetter(Object obj, String methodName, Object defaultValue) {
try {
Method method = obj.getClass().getMethod(methodName, new Class[0]);
Object result = method.invoke(obj, new Object[0]);
return result;
} catch (NoSuchMethodException e) {
return defaultValue;
} catch (IllegalAccessException e) {
return defaultValue;
} catch (InvocationTargetException e) {
return defaultValue;
}
}
public void propertyChange(PropertyChangeEvent e) {
if (SeaGlassLookAndFeel.shouldUpdateStyle(e)) {
updateStyle((JComponent) e.getSource());
}
}
}