synthmenubarui.java

Mobile 应用程序使用 Java Micro Edition (Java ME) 平台

/*
 * @(#)SynthMenuBarUI.java	1.11 05/11/17
 *
 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */
package javax.swing.plaf.synth;

import javax.swing.*;
import javax.swing.event.*;
import java.awt.Color;
import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Insets;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.event.*;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;

import javax.swing.border.*;
import javax.swing.plaf.*;
import javax.swing.plaf.basic.*;
import sun.swing.plaf.synth.SynthUI;

/**
 * Synth's MenuBarUI.
 *
 * @version 1.11, 11/17/05
 * @author Scott Violet
 */
class SynthMenuBarUI extends BasicMenuBarUI implements PropertyChangeListener,
                                  SynthUI {
    private SynthStyle style;

    public static ComponentUI createUI(JComponent x) {
	return new SynthMenuBarUI();
    }

    protected void installDefaults() {
	if (menuBar.getLayout() == null ||
	    menuBar.getLayout() instanceof UIResource) {
            menuBar.setLayout(new DefaultMenuLayout(menuBar,BoxLayout.LINE_AXIS));
        }
        updateStyle(menuBar);
    }

    protected void installListeners() {
        super.installListeners();
        menuBar.addPropertyChangeListener(this);
    }

    private void updateStyle(JMenuBar c) {
        SynthContext context = getContext(c, ENABLED);
        SynthStyle oldStyle = style;
        style = SynthLookAndFeel.updateStyle(context, this);
        if (style != oldStyle) {
            if (oldStyle != null) {
                uninstallKeyboardActions();
                installKeyboardActions();
            }
        }
        context.dispose();
    }

    protected void uninstallDefaults() {
        SynthContext context = getContext(menuBar, ENABLED);

        style.uninstallDefaults(context);
        context.dispose();
        style = null;
    }

    protected void uninstallListeners() {
        super.uninstallListeners();
        menuBar.removePropertyChangeListener(this);
    }

    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 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().paintMenuBarBackground(context,
                          g, 0, 0, c.getWidth(), c.getHeight());
        paint(context, g);
        context.dispose();
    }

    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 paintBorder(SynthContext context, Graphics g, int x,
                            int y, int w, int h) {
        context.getPainter().paintMenuBarBorder(context, g, x, y, w, h);
    }

    public void propertyChange(PropertyChangeEvent e) {
        if (SynthLookAndFeel.shouldUpdateStyle(e)) {
            updateStyle((JMenuBar)e.getSource());
        }
    }
}