Andreas Hocevar
145 lines
2.8 KiB
HTML
145 lines
2.8 KiB
HTML
<!DOCTYPE html>
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<html>
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<!--
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Copyright 2014 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.WheelHandler</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: 500px;
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height: 500px;
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position: relative;
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display: inline-block;
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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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#debug {
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font-family: monospace;
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white-space: pre;
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display: inline-block;
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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.WheelHandler');
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</script>
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</head>
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<body>
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<h1>goog.events.WheelHandler</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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<div id=debug>
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</div>
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<script>
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var WheelHandler = goog.events.WheelHandler;
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var WHEEL = WheelHandler.EventType.WHEEL;
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function $(id) {
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return document.getElementById(id)
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}
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var x = 250, y = 250;
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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 statusLine = $('status');
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var debug = $('debug');
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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 handleWheel(e) {
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x += e.pixelDeltaX;
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x = Math.max(0, Math.min(availWidth, x));
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y += e.pixelDeltaY;
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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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var deltaModeString = 'unknown';
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var DeltaMode = goog.events.WheelHandler.DeltaMode;
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switch (e.deltaMode) {
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case DeltaMode.PIXEL:
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deltaModeString = 'DeltaMode.PIXEL';
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break;
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case DeltaMode.LINE:
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deltaModeString = 'DeltaMode.LINE';
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break;
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case DeltaMode.PAGE:
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deltaModeString = 'DeltaMode.PAGE';
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break;
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}
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var debugObject = {
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type: e.type,
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deltaMode: deltaModeString,
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deltaX: e.deltaX,
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deltaY: e.deltaY,
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deltaZ: e.deltaZ,
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pixelDeltaX: e.pixelDeltaX,
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pixelDeltaY: e.pixelDeltaY,
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pixelDeltaZ: e.pixelDeltaZ,
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};
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debug.innerText = JSON.stringify(debugObject, undefined, 4);
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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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statusLine.innerText = x + ', ' + y;
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}
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updateLines();
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var mwh = new WheelHandler(out);
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goog.events.listen(mwh, WHEEL, handleWheel);
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goog.events.listen(window, 'unload', function(e) {
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goog.events.unlisten(mwh, WHEEL, handleWheel);
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});
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</script>
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</body>
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</html>
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