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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
*/
<div id="cls-Ext.list.ColumnResizer"></div>/**
* @class Ext.list.ColumnResizer
* @extends Ext.util.Observable
* <p>Supporting Class for Ext.list.ListView</p>
* @constructor
* @param {Object} config
*/
Ext.list.ColumnResizer = Ext.extend(Ext.util.Observable, {
<div id="cfg-Ext.list.ColumnResizer-minPct"></div>/**
* @cfg {Number} minPct The minimum percentage to allot for any column (defaults to <tt>.05</tt>)
*/
minPct: .05,
constructor: function(config){
Ext.apply(this, config);
Ext.list.ColumnResizer.superclass.constructor.call(this);
},
init : function(listView){
this.view = listView;
listView.on('render', this.initEvents, this);
},
initEvents : function(view){
view.mon(view.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(view.innerHd);
view.on('beforedestroy', this.tracker.destroy, this.tracker);
},
handleHdMove : function(e, t){
var handleWidth = 5,
x = e.getPageX(),
header = e.getTarget('em', 3, true);
if(header){
var region = header.getRegion(),
style = header.dom.style,
parentNode = header.dom.parentNode;
if(x - region.left <= handleWidth && parentNode != parentNode.parentNode.firstChild){
this.activeHd = Ext.get(parentNode.previousSibling.firstChild);
style.cursor = Ext.isWebKit ? 'e-resize' : 'col-resize';
} else if(region.right - x <= handleWidth && parentNode != parentNode.parentNode.lastChild.previousSibling){
this.activeHd = header;
style.cursor = Ext.isWebKit ? 'w-resize' : 'col-resize';
} else{
delete this.activeHd;
style.cursor = '';
}
}
},
onBeforeStart : function(e){
this.dragHd = this.activeHd;
return !!this.dragHd;
},
onStart: function(e){
var me = this,
view = me.view,
dragHeader = me.dragHd,
x = me.tracker.getXY()[0];
me.proxy = view.el.createChild({cls:'x-list-resizer'});
me.dragX = dragHeader.getX();
me.headerIndex = view.findHeaderIndex(dragHeader);
me.headersDisabled = view.disableHeaders;
view.disableHeaders = true;
me.proxy.setHeight(view.el.getHeight());
me.proxy.setX(me.dragX);
me.proxy.setWidth(x - me.dragX);
this.setBoundaries();
},
// Sets up the boundaries for the drag/drop operation
setBoundaries: function(relativeX){
var view = this.view,
headerIndex = this.headerIndex,
width = view.innerHd.getWidth(),
relativeX = view.innerHd.getX(),
minWidth = Math.ceil(width * this.minPct),
maxWidth = width - minWidth,
numColumns = view.columns.length,
headers = view.innerHd.select('em', true),
minX = minWidth + relativeX,
maxX = maxWidth + relativeX,
header;
if (numColumns == 2) {
this.minX = minX;
this.maxX = maxX;
}else{
header = headers.item(headerIndex + 2);
this.minX = headers.item(headerIndex).getX() + minWidth;
this.maxX = header ? header.getX() - minWidth : maxX;
if (headerIndex == 0) {
// First
this.minX = minX;
} else if (headerIndex == numColumns - 2) {
// Last
this.maxX = maxX;
}
}
},
onDrag: function(e){
var me = this,
cursorX = me.tracker.getXY()[0].constrain(me.minX, me.maxX);
me.proxy.setWidth(cursorX - this.dragX);
},
onEnd: function(e){
/* calculate desired width by measuring proxy and then remove it */
var newWidth = this.proxy.getWidth(),
index = this.headerIndex,
view = this.view,
columns = view.columns,
width = view.innerHd.getWidth(),
newPercent = Math.ceil(newWidth * view.maxColumnWidth / width) / 100,
disabled = this.headersDisabled,
headerCol = columns[index],
otherCol = columns[index + 1],
totalPercent = headerCol.width + otherCol.width;
this.proxy.remove();
headerCol.width = newPercent;
otherCol.width = totalPercent - newPercent;
delete this.dragHd;
view.setHdWidths();
view.refresh();
setTimeout(function(){
view.disableHeaders = disabled;
}, 100);
}
});
// Backwards compatibility alias
Ext.ListView.ColumnResizer = Ext.list.ColumnResizer;</pre>
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