/*
* Copyright (c) 2002, 2007, 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
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*/
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();
}
}
}