81 lines
2.6 KiB
Java
81 lines
2.6 KiB
Java
/* Copyright (C) 1999, 2000, 2002 Free Software Foundation
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA.
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As a special exception, if you link this library with other files to
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produce an executable, this library does not by itself cause the
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resulting executable to be covered by the GNU General Public License.
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This exception does not however invalidate any other reasons why the
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executable file might be covered by the GNU General Public License. */
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package java.awt;
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import java.awt.peer.ComponentPeer;
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public class Canvas extends Component implements java.io.Serializable
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{
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transient GraphicsConfiguration graphicsConfiguration;
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/**
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* Initializes a new instance of <code>Canvas</code>.
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*/
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public Canvas() { }
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public Canvas(GraphicsConfiguration graphicsConfiguration)
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{
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this.graphicsConfiguration = graphicsConfiguration;
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}
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GraphicsConfiguration getGraphicsConfigurationImpl()
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{
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if (graphicsConfiguration != null)
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return graphicsConfiguration;
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return super.getGraphicsConfigurationImpl();
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}
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/**
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* Creates the native peer for this object.
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*/
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public void addNotify()
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{
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if (peer == null)
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peer = (ComponentPeer) getToolkit().createCanvas(this);
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super.addNotify();
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}
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/**
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* Repaints the canvas window. This method should be overriden by
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* a subclass to do something useful, as this method simply paints
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* the window with the background color.
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*/
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public void paint(Graphics gfx)
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{
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/* This implementation doesn't make much sense since the filling
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of background color is guaranteed for heavyweight components
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such as this. But there's no need to worry, since paint() is
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usually overridden anyway. */
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gfx.setColor(getBackground());
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Dimension size = getSize();
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gfx.fillRect(0, 0, size.width, size.height);
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}
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// Serialization constant
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private static final long serialVersionUID = -2284879212465893870L;
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}
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