src/java.desktop/windows/classes/sun/awt/windows/WKeyboardFocusManagerPeer.java

/*
 * Copyright (c) 2009, 2016, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 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.
 *
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package sun.awt.windows;

import java.awt.Window;
import java.awt.Component;
import java.awt.peer.ComponentPeer;

import sun.awt.AWTAccessor;
import sun.awt.AWTAccessor.ComponentAccessor;
import sun.awt.KeyboardFocusManagerPeerImpl;
import java.awt.event.FocusEvent.Cause;

final class WKeyboardFocusManagerPeer extends KeyboardFocusManagerPeerImpl {
    static native void setNativeFocusOwner(ComponentPeer peer);
    static native Component getNativeFocusOwner();
    static native Window getNativeFocusedWindow();

    private static final WKeyboardFocusManagerPeer inst = new WKeyboardFocusManagerPeer();

    public static WKeyboardFocusManagerPeer getInstance() {
        return inst;
    }

    private WKeyboardFocusManagerPeer() {
    }

    @Override
    public void setCurrentFocusOwner(Component comp) {
        final ComponentAccessor acc = AWTAccessor.getComponentAccessor();
        setNativeFocusOwner(comp != null ? acc.getPeer(comp) : null);
    }

    @Override
    public Component getCurrentFocusOwner() {
        return getNativeFocusOwner();
    }

    @Override
    public void setCurrentFocusedWindow(Window win) {
        // Not used on Windows
        throw new RuntimeException("not implemented");
    }

    @Override
    public Window getCurrentFocusedWindow() {
        return getNativeFocusedWindow();
    }

    public static boolean deliverFocus(Component lightweightChild,
                                       Component target,
                                       boolean temporary,
                                       boolean focusedWindowChangeAllowed,
                                       long time,
                                       Cause cause)
    {
        // TODO: do something to eliminate this forwarding
        return KeyboardFocusManagerPeerImpl.deliverFocus(lightweightChild,
                                                         target,
                                                         temporary,
                                                         focusedWindowChangeAllowed,
                                                         time,
                                                         cause,
                                                         getNativeFocusOwner());
    }
}