/*

 * Copyright (c) 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;

import java.awt.Container;

import java.awt.Frame;

import java.awt.Graphics;

import java.awt.Image;

import java.awt.MenuBar;

import java.awt.MenuComponent;

import java.awt.Rectangle;

import java.awt.Toolkit;

import java.awt.peer.FramePeer;

/**

 * The class provides basic functionality for a lightweight frame

 * implementation. A subclass is expected to provide painting to an

 * offscreen image and access to it. Thus it can be used for lightweight

 * embedding.

 *

 * @author Artem Ananiev

 * @author Anton Tarasov

 */

@SuppressWarnings("serial")

public abstract class LightweightFrame extends Frame {

    /**

     * Constructs a new, initially invisible {@code LightweightFrame}

     * instance.

     */

    public LightweightFrame() {

        setUndecorated(true);

        setResizable(true);

        setEnabled(true);

    }

    /**

     * Blocks introspection of a parent window by this child.

     *

     * @return null

     */

    @Override public final Container getParent() { return null; }

    @Override public Graphics getGraphics() { return null; }

    @Override public final boolean isResizable() { return true; }

    // Block modification of any frame attributes, since they aren't

    // applicable for a lightweight frame.

    @Override public final void setTitle(String title) {}

    @Override public final void setIconImage(Image image) {}

    @Override public final void setIconImages(java.util.List<? extends Image> icons) {}

    @Override public final void setMenuBar(MenuBar mb) {}

    @Override public final void setResizable(boolean resizable) {}

    @Override public final void remove(MenuComponent m) {}

    @Override public final void toFront() {}

    @Override public final void toBack() {}

    @Override public void addNotify() {

        synchronized (getTreeLock()) {

            if (getPeer() == null) {

                SunToolkit stk = (SunToolkit)Toolkit.getDefaultToolkit();

                try {

                    setPeer(stk.createLightweightFrame(this));

                } catch (Exception e) {

                    throw new RuntimeException(e);

                }

            }

            super.addNotify();

        }

    }

    private void setPeer(final FramePeer p) {

        AWTAccessor.getComponentAccessor().setPeer(this, p);

    }

    /**

     * Requests the peer to emulate activation or deactivation of the

     * frame. Peers should override this method if they are to implement

     * this functionality.

     *

     * @param activate if <code>true</code>, activates the frame;

     *                 otherwise, deactivates the frame

     */

    public void emulateActivation(boolean activate) {

        ((FramePeer)getPeer()).emulateActivation(activate);

    }

    /**

     * Delegates the focus grab action to the client (embedding) application.

     * The method is called by the AWT grab machinery.

     *

     * @see SunToolkit#grab(java.awt.Window)

     */

    public abstract void grabFocus();

    /**

     * Delegates the focus ungrab action to the client (embedding) application.

     * The method is called by the AWT grab machinery.

     *

     * @see SunToolkit#ungrab(java.awt.Window)

     */

    public abstract void ungrabFocus();

    /**

     * Returns the scale factor of this frame. The default value is 1.

     *

     * @return the scale factor

     * @see #notifyDisplayChanged(int)

     */

    public abstract int getScaleFactor();

    /**

     * Called when display of the hosted frame is changed.

     *

     * @param scaleFactor the scale factor

     */

    public abstract void notifyDisplayChanged(int scaleFactor);

    /**

     * Host window absolute bounds.

     */

    private int hostX, hostY, hostW, hostH;

    /**

     * Returns the absolute bounds of the host (embedding) window.

     *

     * @return the host window bounds

     */

    public Rectangle getHostBounds() {

        if (hostX == 0 && hostY == 0 && hostW == 0 && hostH == 0) {

            // The client app is probably unaware of the setHostBounds.

            // A safe fall-back:

            return getBounds();

        }

        return new Rectangle(hostX, hostY, hostW, hostH);

    }

    /**

     * Sets the absolute bounds of the host (embedding) window.

     */

    public void setHostBounds(int x, int y, int w, int h) {

        hostX = x;

        hostY = y;

        hostW = w;

        hostH = h;

    }

}