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jsMouseDragTracker.html
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<!DOCTYPE HTML>
<html>
<head>
<style>
body {
margin: 0px;
padding: 0px;
}
#myCanvas {
border: 1px solid #989898;
}
</style>
<script type="text/javascript" src="mouseDragTracker.js"></script>
<script type="text/javascript" src="logEvents.js"></script>
<script>
window.onload = function() {
var dragTracker = create_drag_tracker("myCanvas");
var canvas = document.getElementById("myCanvas");
var onDragStateChanged = function ( tracker, button )
{
var context = canvas.getContext("2d");
var lineHeight = 24;
var numButtons = 3;
context.clearRect(0, 0, canvas.width, canvas.height);
context.font = "16px sans-serif";
for (var i = 1; i <= numButtons; i++)
{
context.fillText("Is dragging button " + i + ": " + tracker.isDragging(i), 40, canvas.height / 2 + (i+1 - numButtons) * lineHeight);
}
}
dragTracker.setDragStateChangedFunction(onDragStateChanged);
// dragTracker.contextMenuEnabled = true; // Not recommended. Can lead to stuck drags.
onDragStateChanged( dragTracker, 0);
// For debugging purposes only:
log_events("myCanvas", "eventlogform");
};
</script>
</head>
<body onmousedown="return false;">
<canvas id="myCanvas" width="300" height="150"></canvas>
<p>Event log: (code adapted from <a href="http://unixpapa.com/js/testmouse-2.html">Jan Wolter</a>)<br/>
<a href="#" class="page" onClick="document.forms['eventlogform'].elements[0].value =''; return false">Clear event log</a></p>
<form name="eventlogform">
<textarea rows=10 cols=40></textarea></p>
</form>
</body>
</html>