/* * 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 * or visit www.oracle.com if you need additional information or have any * questions. */ package javax.swing.plaf.synth; import javax.swing.*;import javax.swing.plaf.*;import javax.swing.plaf.basic.BasicPanelUI;import java.awt.*;import java.beans.*; /** * Provides the Synth L&F UI delegate for * {@link javax.swing.JPanel}. * * @author Steve Wilson * @since 1.7 */public class SynthPanelUI extends BasicPanelUI                          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 SynthPanelUI();    }     /**     * @inheritDoc     */    @Override    public void installUI(JComponent c) {        JPanel p = (JPanel)c;         super.installUI(c);        installListeners(p);    }     /**     * @inheritDoc     */    @Override    public void uninstallUI(JComponent c) {        JPanel p = (JPanel)c;         uninstallListeners(p);        super.uninstallUI(c);    }     /**     * Installs listeners into the panel.     *     * @param p the {@code JPanel} object     */    protected void installListeners(JPanel p) {        p.addPropertyChangeListener(this);    }     /**     * Uninstalls listeners from the panel.     *     * @param p the {@code JPanel} object     */    protected void uninstallListeners(JPanel p) {        p.removePropertyChangeListener(this);    }     /**     * @inheritDoc     */    @Override    protected void installDefaults(JPanel p) {        updateStyle(p);    }     /**     * @inheritDoc     */    @Override    protected void uninstallDefaults(JPanel p) {        SynthContext context = getContext(p, ENABLED);         style.uninstallDefaults(context);        context.dispose();        style = null;    }     private void updateStyle(JPanel c) {        SynthContext context = getContext(c, ENABLED);        style = SynthLookAndFeel.updateStyle(context, this);        context.dispose();    }     /**     * @inheritDoc     */    @Override    public SynthContext getContext(JComponent c) {        return getContext(c, getComponentState(c));    }     private SynthContext getContext(JComponent c, int state) {        return SynthContext.getContext(SynthContext.class, c,                    SynthLookAndFeel.getRegion(c), style, state);    }     private int getComponentState(JComponent c) {        return SynthLookAndFeel.getComponentState(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().paintPanelBackground(context,                          g, 0, 0, c.getWidth(), c.getHeight());        paint(context, g);        context.dispose();    }     /**     * 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) {        // do actual painting    }     /**     * @inheritDoc     */    @Override    public void paintBorder(SynthContext context, Graphics g, int x,                            int y, int w, int h) {        context.getPainter().paintPanelBorder(context, g, x, y, w, h);    }     /**     * @inheritDoc     */    @Override    public void propertyChange(PropertyChangeEvent pce) {        if (SynthLookAndFeel.shouldUpdateStyle(pce)) {            updateStyle((JPanel)pce.getSource());        }    }}