/*

 * Copyright (c) 2002, 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.X11;

import java.awt.*;

import java.awt.peer.*;

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();

        }

    }

    /* Get a GraphicsConfig with the same visual on the new

     * screen, which should be easy in Xinerama mode.

     */

    public GraphicsConfiguration getAppropriateGraphicsConfiguration(

                                    GraphicsConfiguration gc)

    {

        if (graphicsConfig == null || gc == null) {

            return gc;

        }

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

        int screenNum = ((X11GraphicsDevice)gc.getDevice()).getScreen();

        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();

        }

        return graphicsConfig;

    }

    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;

    }

}