Andreas Hocevar
110 lines
2.1 KiB
HTML
110 lines
2.1 KiB
HTML
<!DOCTYPE html>
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<html>
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<!--
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Copyright 2010 The Closure Library Authors. All Rights Reserved.
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Use of this source code is governed by the Apache License, Version 2.0.
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See the COPYING file for details.
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-->
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<head>
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<title>goog.events.MouseWheelHandler</title>
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<link rel="stylesheet" href="../css/checkbox.css">
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<style>
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#out {
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background-color: #eee;
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width: 200px;
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height: 200px;
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position: relative;
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}
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#h-line, #v-line {
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position: absolute;
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background: black;
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}
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#h-line {
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width: 20px;
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height: 1px;
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}
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#v-line {
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width: 1px;
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height: 20px;
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}
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#status {
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position: absolute;
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bottom: 0;
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right: 0;
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font: 70% sans-serif;
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}
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</style>
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<script src="../base.js"></script>
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<script>
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goog.require('goog.events');
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goog.require('goog.events.MouseWheelHandler');
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</script>
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</head>
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<body>
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<h1>goog.events.MouseWheelHandler</h1>
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<p>Use your mousewheel on the gray box below to move the cross hair.
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<div id=out>
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<div id=h-line></div>
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<div id=v-line></div>
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<div id=status></div>
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</div>
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<script>
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var MouseWheelHandler = goog.events.MouseWheelHandler;
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var MOUSEWHEEL = MouseWheelHandler.EventType.MOUSEWHEEL;
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function $(id) {
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return document.getElementById(id)
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}
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var x = 100, y = 100;
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var out = $('out');
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var hLine= $('h-line');
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var vLine = $('v-line');
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var status = $('status');
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var availWidth = out.clientWidth - vLine.offsetWidth;
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var availHeight = out.clientHeight - hLine.offsetHeight;
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function handleMouseWheel(e) {
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x += e.deltaX / 3;
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x = Math.max(0, Math.min(availWidth, x));
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y += e.deltaY / 3;
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y = Math.max(0, Math.min(availHeight, y));
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updateLines();
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e.preventDefault();
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}
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function updateLines() {
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vLine.style.left = x + 'px';
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hLine.style.left = x - hLine.offsetWidth / 2 + 'px';
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hLine.style.top = y + 'px';
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vLine.style.top = y - vLine.offsetHeight / 2 + 'px';
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status.innerHTML = x + ', ' + y;
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}
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updateLines();
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var mwh = new MouseWheelHandler(out);
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goog.events.listen(mwh, MOUSEWHEEL, handleMouseWheel);
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goog.events.listen(window, 'unload', function(e) {
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goog.events.unlisten(mwh, MOUSEWHEEL, handleMouseWheel);
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});
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</script>
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</body>
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</html>
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