JDK8/Java8源码在线阅读

/*
 * Copyright (c) 1997, 2004, 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 com.sun.java.swing.plaf.motif;


import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;

import javax.swing.plaf.*;
import javax.swing.plaf.basic.BasicMenuItemUI;


/**
 * MotifMenuItem implementation
 * <p>
 *
 * @author Rich Schiavi
 * @author Georges Saab
 */
public class MotifMenuItemUI extends BasicMenuItemUI
{
    protected ChangeListener changeListener;

    public static ComponentUI createUI(JComponent c)
    {
        return new MotifMenuItemUI();
    }

    protected void installListeners() {
        super.installListeners();
        changeListener = createChangeListener(menuItem);
        menuItem.addChangeListener(changeListener);
    }

    protected void uninstallListeners() {
        super.uninstallListeners();
        menuItem.removeChangeListener(changeListener);
    }

    protected ChangeListener createChangeListener(JComponent c) {
        return new ChangeHandler();
    }

    protected MouseInputListener createMouseInputListener(JComponent c) {
        return new MouseInputHandler();
    }

    protected class ChangeHandler implements ChangeListener {

        public void stateChanged(ChangeEvent e) {
            JMenuItem c = (JMenuItem)e.getSource();
            LookAndFeel.installProperty(c, "borderPainted",
                        Boolean.valueOf(c.isArmed() || c.isSelected()));
        }
    }

    protected class MouseInputHandler implements MouseInputListener {
        public void mouseClicked(MouseEvent e) {}
        public void mousePressed(MouseEvent e) {
            MenuSelectionManager manager = MenuSelectionManager.defaultManager();
            manager.setSelectedPath(getPath());
        }
        public void mouseReleased(MouseEvent e) {
            MenuSelectionManager manager =
                MenuSelectionManager.defaultManager();
            JMenuItem menuItem = (JMenuItem)e.getComponent();
            Point p = e.getPoint();
            if(p.x >= 0 && p.x < menuItem.getWidth() &&
               p.y >= 0 && p.y < menuItem.getHeight()) {
                manager.clearSelectedPath();
                menuItem.doClick(0);

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