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POJava: Making a window click-through (including text/images)
 

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  1. POJava: Making a window click-through (including text/images)
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    <p>I want to create an overlay in Java that is <strong>transparent</strong>, <strong>always on top</strong>, and that I can <strong>click-through</strong>. I've found some <a href="https://stackoverflow.com/questions/4167664/ability-to-click-through-a-java-app">similar</a> <a href="https://stackoverflow.com/questions/10465203/opaque-components-on-transparent-java-windows">posts</a> about this issue, but even after following their answers, I'm having one issue.</p> <p>My problem is making the <strong>whole window</strong> click-through. I'm not having any problem making it work with a JFrame, but once I <strong>add any components</strong> to it (JLabel or an ImagePanel), the <strong>click-through attribute doesn't carry over</strong> to them.</p> <p>As I want to have a background image for my application this basically makes the code I have useless seeing how the window gets focused whenever I click the area the text/image covers.</p> <p>Before I show the code I'm using I'd first like to refer to <a href="https://stackoverflow.com/questions/527933/how-to-make-a-click-and-see-through-always-on-top-window">these</a> <a href="https://stackoverflow.com/questions/112224/click-through-transparency-for-visual-c-sharp-window-forms">threads</a> which essentially describes precisely what I want, except in C#.</p> <p>My goal is to create an overlay with a transparent .png-image and some text on-top that will change on key events. If it uses JFrame or any other library doesn't matter. I only need it compatible with Windows.</p> <p>I'd also like to mention that I've got some experience with Java, but am a novice in using JFrame.</p> <pre><code>import java.awt.BorderLayout; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.SwingConstants; import com.sun.jna.platform.WindowUtils; public class Overlay { public static void main(String[] args) { JFrame frame = new JFrame("Overlay Window"); frame.setUndecorated(true); frame.setAlwaysOnTop(true); frame.getRootPane().putClientProperty("apple.awt.draggableWindowBackground", false); frame.setLocation(400, 400); frame.getContentPane().setLayout(new java.awt.BorderLayout()); JLabel textLabel = new JLabel("I'm a label in the window", SwingConstants.CENTER); frame.getContentPane().add(textLabel, BorderLayout.CENTER); frame.pack(); System.setProperty("sun.java2d.noddraw", "true"); WindowUtils.setWindowTransparent(frame, true); WindowUtils.setWindowAlpha(frame, 1.0f); //Using AWTUtilities gives the same result as WindowUtils //AWTUtilities.setWindowOpaque(frame, false); //AWTUtilities.setWindowOpacity(frame, 1.0f); frame.setVisible(true); } } </code></pre> <p>Note that the problem is <strong>not about the window being focused</strong> (though that is a result of the issue), but about the <strong>JLabel and ImagePanel not being click-through</strong>.</p>
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    1. USCarl Johnsson
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    1. COYou probably need to set the WS_EX_TRANSPARENT flag on the JFrame's window to ensure that mouse events are passed through that window. Here is an example: http://www.codeproject.com/Articles/12877/Transparent-Click-Through-Forms
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    2. CODo you want to simply have all clicks go to a single component in the JFrame, or have them pass through to whatever might be beneath the JFrame (including the desktop)?
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