/* * @(#)SynthViewportUI.java	1.11 03/12/19 * * Copyright 2004 Sun Microsystems, Inc. All rights reserved. * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms. */package javax.swing.plaf.synth;import java.awt.*;import java.beans.*;import javax.swing.*;import javax.swing.border.*;import javax.swing.plaf.*;import java.awt.*;import java.awt.event.*;import sun.swing.plaf.synth.SynthUI;/** * Synth's ViewportUI. * * @version 1.11, 12/19/03 */class SynthViewportUI extends ViewportUI implements           PropertyChangeListener, SynthUI {    private SynthStyle style;    public static ComponentUI createUI(JComponent c) {        return new SynthViewportUI();    }    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) {        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();    }    protected void installListeners(JComponent c) {        c.addPropertyChangeListener(this);    }    protected void uninstallListeners(JComponent c) {        c.removePropertyChangeListener(this);    }    protected void uninstallDefaults(JComponent c) {        SynthContext context = getContext(c, ENABLED);        style.uninstallDefaults(context);        context.dispose();        style = null;    }    public SynthContext getContext(JComponent c) {        return getContext(c, 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);    }    private int getComponentState(JComponent c) {        return SynthLookAndFeel.getComponentState(c);    }    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();    }    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) {        SynthContext context = getContext(c);        paint(context, g);        context.dispose();    }    protected void paint(SynthContext context, Graphics g) {    }    public void propertyChange(PropertyChangeEvent e) {        if (SynthLookAndFeel.shouldUpdateStyle(e)) {            updateStyle((JComponent)e.getSource());        }    }}