MMenuItemPeer.java

/*
 * Copyright 1995-2003 Sun Microsystems, Inc.  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.  Sun designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 */
package sun.awt.motif;

import java.awt.*;
import java.awt.peer.*;
import java.awt.event.ActionEvent;
import sun.awt.AppContext;

class MMenuItemPeer implements MenuItemPeer {
    long        pData;
    long        jniGlobalRef;
    boolean     isCheckbox = false;
    MenuItem    target;
    boolean     nativeCreated = false;

    private boolean disposed = false;

    static {
        initIDs();
    }

    /**
     * Initialize JNI field and method IDs
     */
    private static native void initIDs();

    native void createMenuItem(MMenuPeer parent);

    void create(MMenuPeer parent) {
        if (parent.nativeCreated) {
            createMenuItem(parent);
            nativeCreated = true;
            setEnabled(target.isEnabled());
        }
    }

    protected MMenuItemPeer() {
    }

    MMenuItemPeer(MenuItem target) {
        this.target = target;
        MMenuPeer parent = (MMenuPeer) MToolkit.targetToPeer(getParent_NoClientCode(target));
        create(parent);
    }

    static native MenuContainer getParent_NoClientCode(MenuComponent menuComponent);

    protected void finalize() throws Throwable {
        dispose();
        super.finalize();
    }

    public void setEnabled(boolean b) {
        if (b) {
            enable();
        } else {
            disable();
        }
    }

    public void setLabel(String label) {
        if (!nativeCreated) {
            return;
        }
        pSetLabel(label);
        // Fix for bug 4234266 AWT component : MenuItem  throw NullPointer exception.
        MenuShortcut sc = target.getShortcut();
        setShortcut(sc != null ? sc.toString() : null );
    }

    public void setShortcut(String shortCut) {
        if (!nativeCreated) {
            return;
        }
        pSetShortcut(shortCut);
    }

    native void pSetLabel(String label);
    native void pSetShortcut(String shortCut);

    /**
     * DEPRECATED but, for now, called by setEnabled(boolean).
     */
    public void enable() {
        if (!nativeCreated) {
            return;
        }
        pEnable();
    }
    native void pEnable();

    /**
     * DEPRECATED but, for now, called by setEnabled(boolean).
     */
    public void disable() {
        if (!nativeCreated) {
            return;
        }
        pDisable();
    }
    native void pDisable();

    private void destroyNativeWidgetImpl() {
        if (nativeCreated) {
            pDispose();
            nativeCreated = false;
        }
    }

    void destroyNativeWidget() {
        // We do not need to synchronize this method because the caller
        // always holds the tree lock

        destroyNativeWidgetImpl();
    }

    /*
     * Subclasses should override disposeImpl() instead of dispose(). Client
     * code should always invoke dispose(), never disposeImpl().
     */
    protected void disposeImpl() {
        // Don't call destroyNativeWidget() because on a Menu, this will
        // cause a traversal of all the menu's MenuItems. This traversal was
        // already done once by java.awt.Menu.removeNotify().

        destroyNativeWidgetImpl();
        MToolkit.targetDisposedPeer(target, this);
    }
    public final void dispose() {
        boolean call_disposeImpl = false;

        if (!disposed) {
            synchronized (this) {
                if (!disposed) {
                    disposed = call_disposeImpl = true;
                }
            }
        }

        if (call_disposeImpl) {
            disposeImpl();
        }
    }

    native void pDispose();

    void postEvent(AWTEvent event) {
        MToolkit.postEvent(MToolkit.targetToAppContext(target), event);
    }

    // NOTE: This method may be called by privileged threads.
    //       DO NOT INVOKE CLIENT CODE ON THIS THREAD!
    public void action(final long when, final int modifiers) {

        MToolkit.executeOnEventHandlerThread(target, new Runnable() {
            public void run() {
                postEvent(new ActionEvent(target, ActionEvent.ACTION_PERFORMED,
                                          target.getActionCommand(), when,
                                          modifiers));
            }
        });
    }

    // Needed for MenuComponentPeer.
    public void setFont(Font f) {
    }
}