JDK14/Java14源码在线阅读

/*
 * Copyright (c) 2011, 2017, 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.apple.laf;

import java.beans.*;

import javax.accessibility.*;
import javax.swing.*;

class ScreenMenuPropertyListener implements PropertyChangeListener {
    ScreenMenuPropertyHandler fMenu;

    ScreenMenuPropertyListener(final ScreenMenuPropertyHandler mc) {
        fMenu = mc;
    }

    /**
     * This method gets called when a bound property is changed.
     * @param e A PropertyChangeEvent object describing the event source
     *       and the property that has changed.
     */
    public void propertyChange(final PropertyChangeEvent e) {
        final String propertyName = e.getPropertyName();

        if ("enabled".equals(propertyName)) {
            fMenu.setEnabled(((Boolean)e.getNewValue()).booleanValue());
            return;
        }

        if (AccessibleContext.ACCESSIBLE_STATE_PROPERTY.equals(propertyName)) {
            // rdar://Problem/3553843
            // When an ACCESSIBLE_STATE_PROPERTY changes, it's always newValue == null and oldValue == state turned off
            // or newValue == state turned on and oldValue == null.  We only care about changes in the ENABLED
            // state, so only change the menu's enabled state when the value is AccessibleState.ENABLED
            if (e.getNewValue() == AccessibleState.ENABLED || e.getOldValue() == AccessibleState.ENABLED) {
                final Object newValue = e.getNewValue();
                fMenu.setEnabled(newValue == AccessibleState.ENABLED);
            }
            return;
    }

        if ("accelerator".equals(propertyName)) {
            fMenu.setAccelerator((KeyStroke)e.getNewValue());
            return;
        }

        if (AbstractButton.TEXT_CHANGED_PROPERTY.equals(propertyName)) {
            fMenu.setLabel((String)e.getNewValue());
            return;
        }

        if (AbstractButton.ICON_CHANGED_PROPERTY.equals(propertyName)) {
            fMenu.setIcon((Icon)e.getNewValue());
            return;
        }


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