/*

 * Copyright 2002-2007 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.X11;

import java.awt.*;

import java.awt.peer.*;

import sun.awt.ComponentAccessor;

import sun.awt.SunToolkit;

import sun.awt.X11GraphicsConfig;

import sun.awt.X11GraphicsDevice;

class XCanvasPeer extends XComponentPeer implements CanvasPeer {

    private boolean eraseBackgroundDisabled;

    XCanvasPeer() {}

    XCanvasPeer(XCreateWindowParams params) {

        super(params);

    }

    XCanvasPeer(Component target) {

        super(target);

    }

    void preInit(XCreateWindowParams params) {

        super.preInit(params);

        if (SunToolkit.getSunAwtNoerasebackground()) {

            disableBackgroundErase();

        }

    }

    void resetTargetGC(Component target) {

        ComponentAccessor.resetGC(target);

    }

    /*

     * Called when the Window this

     * Canvas is on is moved onto another Xinerama screen.

     *

     * Canvases can be created with a non-defulat GraphicsConfiguration.  The

     * GraphicsConfiguration needs to be changed to one on the new screen,

     * preferably with the same visual ID.

     *

     * Up-called for other windows peer instances (XPanelPeer, XWindowPeer).

     *

     * Should only be called from the event thread.

     */

    public void displayChanged(int screenNum) {

        resetLocalGC(screenNum);

        resetTargetGC(target);

    }

    /* Set graphicsConfig to a GraphicsConfig with the same visual on the new

     * screen, which should be easy in Xinerama mode.

     *

     * Should only be called from displayChanged(), and therefore only from

     * the event thread.

     */

    void resetLocalGC(int screenNum) {

        // Opt: Only need to do if we're not using the default GC

        if (graphicsConfig != null) {

            X11GraphicsConfig parentgc;

            // save vis id of current gc

            int visual = graphicsConfig.getVisual();

            X11GraphicsDevice newDev = (X11GraphicsDevice) GraphicsEnvironment.

                getLocalGraphicsEnvironment().

                getScreenDevices()[screenNum];

            for (int i = 0; i < newDev.getNumConfigs(screenNum); i++) {

                if (visual == newDev.getConfigVisualId(i, screenNum)) {

                    // use that

                    graphicsConfig = (X11GraphicsConfig)newDev.getConfigurations()[i];

                    break;

                }

            }

            // just in case...

            if (graphicsConfig == null) {

                graphicsConfig = (X11GraphicsConfig) GraphicsEnvironment.

                    getLocalGraphicsEnvironment().

                    getScreenDevices()[screenNum].

                    getDefaultConfiguration();

            }

        }

    }

    protected boolean shouldFocusOnClick() {

        // Canvas should always be able to be focused by mouse clicks.

        return true;

    }

    public void disableBackgroundErase() {

        eraseBackgroundDisabled = true;

    }

    protected boolean doEraseBackground() {

        return !eraseBackgroundDisabled;

    }

    public void setBackground(Color c) {

        boolean doRepaint = false;

        if( getPeerBackground() == null ||

           !getPeerBackground().equals( c ) ) {

            doRepaint = true;

        }

        super.setBackground(c);

        if( doRepaint ) {

            target.repaint();

        }

    }

}