Java example source code file (LWButtonPeer.java)

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Java - Java tags/keywords

actionevent, actionlistener, awt, event, gui, jbutton, jbuttondelegate, lwbuttonpeer, lwcomponentpeer, override, platformcomponent, safe, string, suppresswarnings, swing

The LWButtonPeer.java Java example source code

/*
 * Copyright (c) 2011, 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.lwawt;

import java.awt.Button;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.peer.ButtonPeer;

import javax.swing.JButton;

/**
 * Lightweight implementation of {@link ButtonPeer}. Delegates most of the work
 * to the {@link JButton}.
 */
final class LWButtonPeer extends LWComponentPeer<Button, JButton>
        implements ButtonPeer, ActionListener {

    LWButtonPeer(final Button target,
                 final PlatformComponent platformComponent) {
        super(target, platformComponent);
    }

    @Override
    JButton createDelegate() {
        return new JButtonDelegate();
    }

    @Override
    void initializeImpl() {
        super.initializeImpl();
        setLabel(getTarget().getLabel());
        synchronized (getDelegateLock()) {
            getDelegate().addActionListener(this);
        }
    }

    @Override
    public void actionPerformed(final ActionEvent e) {
        postEvent(new ActionEvent(getTarget(), ActionEvent.ACTION_PERFORMED,
                                  getTarget().getActionCommand(), e.getWhen(),
                                  e.getModifiers()));
    }

    @Override
    public void setLabel(final String label) {
        synchronized (getDelegateLock()) {
            getDelegate().setText(label);
        }
    }

    @Override
    public boolean isFocusable() {
        return true;
    }

    @SuppressWarnings("serial")// Safe: outer class is non-serializable.
    private final class JButtonDelegate extends JButton {

        // Empty non private constructor was added because access to this
        // class shouldn't be emulated by a synthetic accessor method.
        JButtonDelegate() {
            super();
        }

        @Override
        public boolean hasFocus() {
            return getTarget().hasFocus();
        }
    }
}