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Java example source code file (WButtonPeer.java)

This example Java source code file (WButtonPeer.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

actionevent, awt, dimension, event, fontmetrics, runnable, string, wbuttonpeer, wcomponentpeer

The WButtonPeer.java Java example source code

/*
 * Copyright (c) 1996, 2013, 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 sun.awt.windows;

import java.awt.*;
import java.awt.peer.*;
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;

final class WButtonPeer extends WComponentPeer implements ButtonPeer {

    static {
        initIDs();
    }

    // ComponentPeer overrides

    public Dimension getMinimumSize() {
        FontMetrics fm = getFontMetrics(((Button)target).getFont());
        String label = ((Button)target).getLabel();
        if ( label == null ) {
            label = "";
        }
        return new Dimension(fm.stringWidth(label) + 14,
                             fm.getHeight() + 8);
    }
    public boolean isFocusable() {
        return true;
    }

    // ButtonPeer implementation

    public native void setLabel(String label);

    // Toolkit & peer internals

    WButtonPeer(Button target) {
        super(target);
    }

    native void create(WComponentPeer peer);

    // native callbacks

    // NOTE: This is called on the privileged toolkit thread. Do not
    //       call directly into user code using this thread!
    public void handleAction(final long when, final int modifiers) {
        // Fixed 5064013: the InvocationEvent time should be equals
        // the time of the ActionEvent
        WToolkit.executeOnEventHandlerThread(target, new Runnable() {
            public void run() {
                postEvent(new ActionEvent(target, ActionEvent.ACTION_PERFORMED,
                                          ((Button)target).getActionCommand(),
                                          when, modifiers));
            }
        }, when);
    }


    public boolean shouldClearRectBeforePaint() {
        return false;
    }

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

    public boolean handleJavaKeyEvent(KeyEvent e) {
         switch (e.getID()) {
            case KeyEvent.KEY_RELEASED:
                if (e.getKeyCode() == KeyEvent.VK_SPACE){
                    handleAction(e.getWhen(), e.getModifiers());
                }
            break;
         }
         return false;
    }
}

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