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POHow to wait for a transition to end in javafx 2.1?
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  1. POHow to wait for a transition to end in javafx 2.1?
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    copied!<p>My scene consists only of an <a href="http://docs.oracle.com/javafx/2/api/javafx/scene/image/ImageView.html">ImageView</a>, displaying an image. I would like to fade the image to black (assigned color of the scene), then after some time, fade from black to the image again. I found the <a href="http://docs.oracle.com/javafx/2/api/javafx/animation/FadeTransition.html">FadeTransition</a> very fitting for this purpose. This is a piece of my code:</p> <pre><code> // fade to black transition FadeTransition ft1 = new FadeTransition(Duration.millis(2000), myImageView); ft1.setFromValue(1.0); ft1.setToValue(0.0); ft1.play(); // fade from black transition FadeTransition ft2 = new FadeTransition(Duration.millis(2000), myImageView); ft2.setFromValue(0.0); ft2.setToValue(1.0); ft2.play(); </code></pre> <p>My problem is that <code>ft1.play()</code> is asynchronous, so the code below will start being executed before <code>ft1.play()</code> is exited. As the result I see only the second transition. How can I wait for the first transition to end and then to launch the second transition? I cannot put the thread to sleep in between because it's the main javafx thread (tried and didn't work).</p> <p>I tried using the onFinishedProperty() method with the combination of a busy-waiting on a flag, but I get stuck in the while loop forever. Here is my code for that:</p> <pre><code> boolean isTransitionPlaying; FadeTransition ft = new FadeTransition(Duration.millis(2000), iv); ft.setFromValue(1.0); ft.setToValue(0.0); ft.onFinishedProperty().set(new EventHandler&lt;ActionEvent&gt;() { @Override public void handle(ActionEvent actionEvent) { transitionPlaying = false; } }); transitionPlaying = true; ft.play(); while (transitionPlaying == true) { // busy wait System.out.println("still waiting..."); } FadeTransition ft2 = new FadeTransition(Duration.millis(2000), iv); ft2.setFromValue(0.0); ft2.setToValue(1.0); ft2.play(); </code></pre> <p>How is waiting done properly? Thank you</p>
 

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