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<title>The source code</title>
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<pre class="prettyprint lang-js"> Ext.lib.Region = function(t, r, b, l) {
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var me = this;
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me.top = t;
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me[1] = t;
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me.right = r;
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me.bottom = b;
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me.left = l;
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me[0] = l;
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};
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Ext.lib.Region.prototype = {
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contains : function(region) {
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var me = this;
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return ( region.left >= me.left &&
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region.right <= me.right &&
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region.top >= me.top &&
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region.bottom <= me.bottom );
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},
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getArea : function() {
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var me = this;
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return ( (me.bottom - me.top) * (me.right - me.left) );
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},
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intersect : function(region) {
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var me = this,
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t = Math.max(me.top, region.top),
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r = Math.min(me.right, region.right),
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b = Math.min(me.bottom, region.bottom),
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l = Math.max(me.left, region.left);
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if (b >= t && r >= l) {
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return new Ext.lib.Region(t, r, b, l);
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}
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},
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union : function(region) {
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var me = this,
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t = Math.min(me.top, region.top),
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r = Math.max(me.right, region.right),
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b = Math.max(me.bottom, region.bottom),
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l = Math.min(me.left, region.left);
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return new Ext.lib.Region(t, r, b, l);
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},
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constrainTo : function(r) {
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var me = this;
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me.top = me.top.constrain(r.top, r.bottom);
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me.bottom = me.bottom.constrain(r.top, r.bottom);
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me.left = me.left.constrain(r.left, r.right);
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me.right = me.right.constrain(r.left, r.right);
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return me;
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},
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adjust : function(t, l, b, r) {
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var me = this;
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me.top += t;
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me.left += l;
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me.right += r;
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me.bottom += b;
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return me;
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}
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};
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Ext.lib.Region.getRegion = function(el) {
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var p = Ext.lib.Dom.getXY(el),
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t = p[1],
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r = p[0] + el.offsetWidth,
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b = p[1] + el.offsetHeight,
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l = p[0];
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return new Ext.lib.Region(t, r, b, l);
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};</pre>
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