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    <p>This is what I came up with. Basically what it does is, it encapsulates an image and a 0.5 opacity canvas on top of each other in a composite widget. The animation draws lines on the canvas from the center towards the edges in a circular fashion in a given time interval. Canvas has a clickHandler to start the animation. Hope it helps. It uses GWT Canvas so this widget may not be supported on all browsers.</p> <p>Class CoolDownAnimation :</p> <pre><code> public class CoolDownAnimation extends Animation { Canvas canvas; Context2d context; int centerX; int centerY; static final CssColor BLACK = CssColor.make("rgba(0,0,0,0.6)"); static final CssColor WHITE = CssColor.make("rgba(255,255,255,0.6)"); public CoolDownAnimation(Canvas canvas) { this.canvas = canvas; canvas.setCoordinateSpaceHeight(20); canvas.setCoordinateSpaceWidth(20); canvas.getElement().getStyle().setOpacity(0.5); this.context = canvas.getContext2d(); centerX = canvas.getCoordinateSpaceWidth() / 2; centerY = canvas.getCoordinateSpaceHeight() / 2; } @Override protected void onStart() { context.beginPath(); context.setStrokeStyle(BLACK); context.fillRect(0, 0, centerX * 2, centerY * 2); context.setStrokeStyle(WHITE); super.onStart(); } @Override protected void onUpdate(double progress) { context.moveTo(centerX, centerY); context.lineTo( centerX + 2 * centerX * Math.cos((progress * Math.PI * 2)-Math.PI/2), centerY + 2 * centerY * Math.sin((progress * Math.PI * 2)-Math.PI/2)); context.stroke(); } @Override protected void onComplete() { super.onComplete(); context.closePath(); context.clearRect(0, 0, centerX*2, centerY*2); } } </code></pre> <p>Class CoolDownWidget : </p> <pre><code> public class CoolDownWidget extends Composite { private CoolDownAnimation coolDown; private AbsolutePanel wrapper; private Image image; private Canvas canvas; private int sizeX = 50; private int sizeY = 50; private int coolDownDuration = 5000; public CoolDownWidget(){ canvas = Canvas.createIfSupported(); if (canvas==null){ Window.alert("Fail! You dont have canvas support"); } canvas.getElement().getStyle().setOpacity(0.5); canvas.setPixelSize(sizeX,sizeY); coolDown = new CoolDownAnimation(canvas); image = new Image("images/icon.png"); image.setPixelSize(sizeX, sizeY); canvas.addClickHandler(new ClickHandler() { @Override public void onClick(ClickEvent event) { coolDown.cancel(); coolDown.run(coolDownDuration); } }); wrapper = new AbsolutePanel(); wrapper.setPixelSize(sizeX, sizeY); wrapper.add(image, 0, 0); wrapper.add(canvas,0,0); initWidget(wrapper); } } </code></pre> <p>finally onModuleLoad to wrap things up :</p> <pre><code> public void onModuleLoad() { RootPanel.get().add(new CoolDownWidget()); } </code></pre>
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    1. POHow to create a WoW-like cooldown effect?
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    1. POHow to create a WoW-like cooldown effect?
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    1. COThat's exactly what I was looking for. A big thanks :)
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      1. USSébastien Tromp
 

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