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<title>The source code</title>
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<pre class="prettyprint lang-js">/*!
* Ext JS Library 3.3.1
* Copyright(c) 2006-2010 Sencha Inc.
* licensing@sencha.com
* http://www.sencha.com/license
*/
<div id="cls-Ext.tree.ColumnResizer"></div>/**
* @class Ext.tree.ColumnResizer
* @extends Ext.util.Observable
*/
Ext.tree.ColumnResizer = Ext.extend(Ext.util.Observable, {
<div id="cfg-Ext.tree.ColumnResizer-minWidth"></div>/**
* @cfg {Number} minWidth The minimum width the column can be dragged to.
* Defaults to <tt>14</tt>.
*/
minWidth: 14,
constructor: function(config){
Ext.apply(this, config);
Ext.tree.ColumnResizer.superclass.constructor.call(this);
},
init : function(tree){
this.tree = tree;
tree.on('render', this.initEvents, this);
},
initEvents : function(tree){
tree.mon(tree.innerHd, 'mousemove', this.handleHdMove, this);
this.tracker = new Ext.dd.DragTracker({
onBeforeStart: this.onBeforeStart.createDelegate(this),
onStart: this.onStart.createDelegate(this),
onDrag: this.onDrag.createDelegate(this),
onEnd: this.onEnd.createDelegate(this),
tolerance: 3,
autoStart: 300
});
this.tracker.initEl(tree.innerHd);
tree.on('beforedestroy', this.tracker.destroy, this.tracker);
},
handleHdMove : function(e, t){
var hw = 5,
x = e.getPageX(),
hd = e.getTarget('.x-treegrid-hd', 3, true);
if(hd){
var r = hd.getRegion(),
ss = hd.dom.style,
pn = hd.dom.parentNode;
if(x - r.left <= hw && hd.dom !== pn.firstChild) {
var ps = hd.dom.previousSibling;
while(ps && Ext.fly(ps).hasClass('x-treegrid-hd-hidden')) {
ps = ps.previousSibling;
}
if(ps) {
this.activeHd = Ext.get(ps);
ss.cursor = Ext.isWebKit ? 'e-resize' : 'col-resize';
}
} else if(r.right - x <= hw) {
var ns = hd.dom;
while(ns && Ext.fly(ns).hasClass('x-treegrid-hd-hidden')) {
ns = ns.previousSibling;
}
if(ns) {
this.activeHd = Ext.get(ns);
ss.cursor = Ext.isWebKit ? 'w-resize' : 'col-resize';
}
} else{
delete this.activeHd;
ss.cursor = '';
}
}
},
onBeforeStart : function(e){
this.dragHd = this.activeHd;
return !!this.dragHd;
},
onStart : function(e){
this.dragHeadersDisabled = this.tree.headersDisabled;
this.tree.headersDisabled = true;
this.proxy = this.tree.body.createChild({cls:'x-treegrid-resizer'});
this.proxy.setHeight(this.tree.body.getHeight());
var x = this.tracker.getXY()[0];
this.hdX = this.dragHd.getX();
this.hdIndex = this.tree.findHeaderIndex(this.dragHd);
this.proxy.setX(this.hdX);
this.proxy.setWidth(x-this.hdX);
this.maxWidth = this.tree.outerCt.getWidth() - this.tree.innerBody.translatePoints(this.hdX).left;
},
onDrag : function(e){
var cursorX = this.tracker.getXY()[0];
this.proxy.setWidth((cursorX-this.hdX).constrain(this.minWidth, this.maxWidth));
},
onEnd : function(e){
var nw = this.proxy.getWidth(),
tree = this.tree,
disabled = this.dragHeadersDisabled;
this.proxy.remove();
delete this.dragHd;
tree.columns[this.hdIndex].width = nw;
tree.updateColumnWidths();
setTimeout(function(){
tree.headersDisabled = disabled;
}, 100);
}
});</pre>
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