Keep draggable elements from being dragged out of a region.
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
<title>Staying in a Region</title>
<style type="text/css">
/*margin and padding on body element
can introduce errors in determining
element position and are not recommended;
we turn them off as a foundation for YUI
CSS treatments. */
body {
margin:0;
padding:0;
}
</style>
<link rel="stylesheet" type="text/css" href="yui_2.7.0b-lib/fonts/fonts-min.css" />
<script type="text/javascript" src="yui_2.7.0b-lib/yahoo-dom-event/yahoo-dom-event.js"></script>
<script type="text/javascript" src="yui_2.7.0b-lib/dragdrop/dragdrop-min.js"></script>
<!--begin custom header content for this example-->
<style type="text/css">
.dd-demo {
position: relative;
text-align: center;
color: #fff;
cursor: move;
height: 60px;
width: 60px;
padding: 0;
margin: 0;
}
.dd-demo div {
border: 1px solid black;
height: 58px;
width: 58px;
}
#dd-demo-canvas1 {
padding: 55px;
background-color: #7E5B60;
border: 1px solid black;
}
#dd-demo-canvas2 {
padding: 25px;
background-color: #566F4E;
border: 1px solid black;
}
#dd-demo-canvas3 {
padding: 15px;
background-color: #6D739A;
border: 1px solid black;
}
#dd-demo-1 {
background-color:#6D739A;top:5px; left:5px;
}
#dd-demo-2 {
background-color:#566F4E;top:50px; left:100px;
}
#dd-demo-3 {
background-color:#7E5B60;top:-100px; left:200px;
}
</style>
<!--end custom header content for this example-->
</head>
<body class=" yui-skin-sam">
<h1>Staying in a Region</h1>
<div class="exampleIntro">
<p>This example shows how to keep draggable elements from being dragged out of a region.</p>
<p>The three elements below will not be able to be dragged beyond the borders of their own colored elements.</p>
</div>
<!--BEGIN SOURCE CODE FOR EXAMPLE -->
<div id="dd-demo-canvas1">
<div id="dd-demo-canvas2">
<div id="dd-demo-canvas3">
<div id="dd-demo-1" class="dd-demo"><div>1</div></div>
<div id="dd-demo-2" class="dd-demo"><div>2</div></div>
<div id="dd-demo-3" class="dd-demo"><div>3</div></div>
</div>
</div>
</div>
<script type="text/javascript">
(function() {
var Dom = YAHOO.util.Dom,
Event = YAHOO.util.Event,
dd1, dd2, dd3;
YAHOO.example.DDRegion = function(id, sGroup, config) {
this.cont = config.cont;
YAHOO.example.DDRegion.superclass.constructor.apply(this, arguments);
};
YAHOO.extend(YAHOO.example.DDRegion, YAHOO.util.DD, {
cont: null,
init: function() {
//Call the parent's init method
YAHOO.example.DDRegion.superclass.init.apply(this, arguments);
this.initConstraints();
Event.on(window, 'resize', function() {
this.initConstraints();
}, this, true);
},
initConstraints: function() {
//Get the top, right, bottom and left positions
var region = Dom.getRegion(this.cont);
//Get the element we are working on
var el = this.getEl();
//Get the xy position of it
var xy = Dom.getXY(el);
//Get the width and height
var width = parseInt(Dom.getStyle(el, 'width'), 10);
var height = parseInt(Dom.getStyle(el, 'height'), 10);
//Set left to x minus left
var left = xy[0] - region.left;
//Set right to right minus x minus width
var right = region.right - xy[0] - width;
//Set top to y minus top
var top = xy[1] - region.top;
//Set bottom to bottom minus y minus height
var bottom = region.bottom - xy[1] - height;
//Set the constraints based on the above calculations
this.setXConstraint(left, right);
this.setYConstraint(top, bottom);
}
});
Event.onDOMReady(function() {
dd1 = new YAHOO.example.DDRegion('dd-demo-1', '', { cont: 'dd-demo-canvas3' });
dd2 = new YAHOO.example.DDRegion('dd-demo-2', '', { cont: 'dd-demo-canvas2' }) ;
dd3 = new YAHOO.example.DDRegion('dd-demo-3', '', { cont: 'dd-demo-canvas1' });
});
})();
</script>
<!--END SOURCE CODE FOR EXAMPLE -->
</body>
</html>
<!-- presentbright.corp.yahoo.com uncompressed/chunked Thu Feb 19 10:53:13 PST 2009 -->
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