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<title>The source code</title>
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<pre class="prettyprint lang-js">/*!
* Ext JS Library 3.4.0
* Copyright(c) 2006-2011 Sencha Inc.
* licensing@sencha.com
* http://www.sencha.com/license
*/
Ext.lib.Region = function(t, r, b, l) {
var me = this;
me.top = t;
me[1] = t;
me.right = r;
me.bottom = b;
me.left = l;
me[0] = l;
};
Ext.lib.Region.prototype = {
contains : function(region) {
var me = this;
return ( region.left >= me.left &&
region.right <= me.right &&
region.top >= me.top &&
region.bottom <= me.bottom );
},
getArea : function() {
var me = this;
return ( (me.bottom - me.top) * (me.right - me.left) );
},
intersect : function(region) {
var me = this,
t = Math.max(me.top, region.top),
r = Math.min(me.right, region.right),
b = Math.min(me.bottom, region.bottom),
l = Math.max(me.left, region.left);
if (b >= t && r >= l) {
return new Ext.lib.Region(t, r, b, l);
}
},
union : function(region) {
var me = this,
t = Math.min(me.top, region.top),
r = Math.max(me.right, region.right),
b = Math.max(me.bottom, region.bottom),
l = Math.min(me.left, region.left);
return new Ext.lib.Region(t, r, b, l);
},
constrainTo : function(r) {
var me = this;
me.top = me.top.constrain(r.top, r.bottom);
me.bottom = me.bottom.constrain(r.top, r.bottom);
me.left = me.left.constrain(r.left, r.right);
me.right = me.right.constrain(r.left, r.right);
return me;
},
adjust : function(t, l, b, r) {
var me = this;
me.top += t;
me.left += l;
me.right += r;
me.bottom += b;
return me;
}
};
Ext.lib.Region.getRegion = function(el) {
var p = Ext.lib.Dom.getXY(el),
t = p[1],
r = p[0] + el.offsetWidth,
b = p[1] + el.offsetHeight,
l = p[0];
return new Ext.lib.Region(t, r, b, l);
};</pre>
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