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POCannot mix lightweight and heavyweight components in an undecorated JFrame
 

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  1. POCannot mix lightweight and heavyweight components in an undecorated JFrame
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    <p>I am attempting to mix heavyweight and lightweight components according to <a href="http://www.oracle.com/technetwork/articles/java/mixing-components-433992.html" rel="nofollow">these</a> guidelines.</p> <p>I am expecting the following code to paint the entire window green. Instead, it renders half the screen red:</p> <pre><code>import java.awt.Canvas; import java.awt.Color; import java.awt.EventQueue; import javax.swing.JFrame; import javax.swing.JLayeredPane; import javax.swing.JPanel; public class Testcase extends Canvas { private static final long serialVersionUID = 0L; public static void main(String[] arg) { final boolean enableWorkaround = false; EventQueue.invokeLater(new Runnable() { @Override public void run() { JFrame frame = new JFrame(); frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); JLayeredPane layers = new JLayeredPane(); frame.getContentPane().add(layers); JPanel green = new JPanel(); green.setBackground(Color.GREEN); green.setBounds(0, 0, 800, 600); layers.add(green, Integer.valueOf(1)); Canvas red = new Canvas(); red.setBackground(Color.RED); red.setBounds(0, 0, 400, 600); layers.add(red, Integer.valueOf(0)); frame.setSize(800, 600); if (!enableWorkaround) frame.setUndecorated(true); frame.setVisible(true); } }); } } </code></pre> <p>Reproduced on:</p> <pre><code>java version "1.6.0_23" Java(TM) SE Runtime Environment (build 1.6.0_23-b05) Java HotSpot(TM) Client VM (build 19.0-b09, mixed mode, sharing) </code></pre> <p>and</p> <pre><code>java version "1.7.0-ea" Java(TM) SE Runtime Environment (build 1.7.0-ea-b124) Java HotSpot(TM) Client VM (build 20.0-b05, mixed mode, sharing) </code></pre> <p>Does my code contain any bugs or is this a legitimate JDK bug?</p>
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    1. USGili
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    1. COThis interests me.
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      1. POCannot mix lightweight and heavyweight components in an undecorated JFrame
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    2. COBasic question: Why do you need to mix light and heavy weigh components? Last I read was that SUN said this was not a good idea (or course that was a while ago). What happens when you just use swing without mixing in AWT components?
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    3. COWe can't go purely lightweight because Java 3D engines all use OpenGL native canvases under the hood. We can't go purely heavyweight because the legacy part of our application is based on Swing and there is little incentive to rewrite it (we don't need 3D for those components).
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