mirror of
https://github.com/Hopiu/fabric.js.git
synced 2026-03-17 22:40:25 +00:00
94 lines
2.8 KiB
HTML
94 lines
2.8 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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<title>Detecting object hovering — Fabric.js demos</title>
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<script src="../../dist/all.js"></script>
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<style>
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.canvas-container { border: 1px solid #ccc; display: inline-block; vertical-align: top; }
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h2 span { font-weight: normal; }
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pre { background: #eef; display: inline-block; padding-right: 15px; margin-left: 15px }
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</style>
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<link rel="stylesheet" href="../../lib/master.css" type="text/css">
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</head>
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<body>
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<ul id="header">
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<li><a href="../index.html">Demos</a></li>
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<li><a href="../../benchmarks/index.html">Benchmarks</a></li>
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<li><a href="../../docs/index.html">Docs</a></li>
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<li><a href="../../test/unit/suite_runner.html">Tests</a></li>
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</ul>
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<div id="bd-wrapper">
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<h2><span>Fabric.js demos</span> · Detecting object hovering</h2>
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<canvas id="c" width="600" height="500"></canvas>
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<script id="main">
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var canvas = new fabric.Canvas('c');
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// piggyback on `canvas.findTarget`, to fire "object:over" and "object:out" events
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canvas.findTarget = (function(originalFn) {
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return function() {
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var target = originalFn.apply(this, arguments);
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if (target) {
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if (this._hoveredTarget !== target) {
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canvas.fire('object:over', { target: target });
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if (this._hoveredTarget) {
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canvas.fire('object:out', { target: this._hoveredTarget });
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}
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this._hoveredTarget = target;
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}
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}
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else if (this._hoveredTarget) {
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canvas.fire('object:out', { target: this._hoveredTarget });
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this._hoveredTarget = null;
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}
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return target;
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};
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})(canvas.findTarget);
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// now we can observe "object:over" and "object:out" events
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// in this example, object is set to red color on hover over and green color on hover out
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canvas.observe('object:over', function(e) {
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e.memo.target.setFill('red');
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canvas.renderAll();
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});
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canvas.observe('object:out', function(e) {
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e.memo.target.setFill('green');
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canvas.renderAll();
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});
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// add random objects
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for (var i = 15; i--; ) {
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var dim = fabric.util.getRandomInt(30, 60);
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var klass = ['Rect', 'Triangle', 'Circle'][fabric.util.getRandomInt(0,2)];
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var options = {
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top: fabric.util.getRandomInt(0, 600),
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left: fabric.util.getRandomInt(0, 600),
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fill: 'green'
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};
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if (klass === 'Circle') {
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options.radius = dim;
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}
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else {
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options.width = dim;
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options.height = dim;
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}
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canvas.add(new fabric[klass](options));
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}
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</script>
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<script>
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(function(){
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var preEl = document.createElement('pre');
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preEl.innerHTML = document.getElementById('main').innerHTML;
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document.getElementById('bd-wrapper').appendChild(preEl);
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})();
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</script>
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</div>
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</body>
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</html>
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