docs/source/ColumnResizer.html

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   2 <head>
   3   <title>The source code</title>
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   8     <pre class="prettyprint lang-js">/*!
   9  * Ext JS Library 3.0.3
  10  * Copyright(c) 2006-2009 Ext JS, LLC
  11  * licensing@extjs.com
  12  * http://www.extjs.com/license
  13  */
  14 <div id="cls-Ext.ListView.ColumnResizer"></div>/**\r
  15  * @class Ext.ListView.ColumnResizer\r
  16  * @extends Ext.util.Observable\r
  17  * <p>Supporting Class for Ext.ListView.</p>\r
  18  * @constructor\r
  19  * @param {Object} config\r
  20  */\r
  21 Ext.ListView.ColumnResizer = Ext.extend(Ext.util.Observable, {\r
  22     <div id="cfg-Ext.ListView.ColumnResizer-minPct"></div>/**\r
  23      * @cfg {Number} minPct The minimum percentage to allot for any column (defaults to <tt>.05</tt>)\r
  24      */\r
  25     minPct: .05,\r
  26 \r
  27     constructor: function(config){\r
  28         Ext.apply(this, config);\r
  29         Ext.ListView.ColumnResizer.superclass.constructor.call(this);\r
  30     },\r
  31     init : function(listView){\r
  32         this.view = listView;\r
  33         listView.on('render', this.initEvents, this);\r
  34     },\r
  35 \r
  36     initEvents : function(view){\r
  37         view.mon(view.innerHd, 'mousemove', this.handleHdMove, this);\r
  38         this.tracker = new Ext.dd.DragTracker({\r
  39             onBeforeStart: this.onBeforeStart.createDelegate(this),\r
  40             onStart: this.onStart.createDelegate(this),\r
  41             onDrag: this.onDrag.createDelegate(this),\r
  42             onEnd: this.onEnd.createDelegate(this),\r
  43             tolerance: 3,\r
  44             autoStart: 300\r
  45         });\r
  46         this.tracker.initEl(view.innerHd);\r
  47         view.on('beforedestroy', this.tracker.destroy, this.tracker);\r
  48     },\r
  49 \r
  50     handleHdMove : function(e, t){\r
  51         var hw = 5,\r
  52             x = e.getPageX(),\r
  53             hd = e.getTarget('em', 3, true);\r
  54         if(hd){\r
  55             var r = hd.getRegion(),\r
  56                 ss = hd.dom.style,\r
  57                 pn = hd.dom.parentNode;\r
  58 \r
  59             if(x - r.left <= hw && pn != pn.parentNode.firstChild){\r
  60                 this.activeHd = Ext.get(pn.previousSibling.firstChild);\r
  61                                 ss.cursor = Ext.isWebKit ? 'e-resize' : 'col-resize';\r
  62             } else if(r.right - x <= hw && pn != pn.parentNode.lastChild.previousSibling){\r
  63                 this.activeHd = hd;\r
  64                                 ss.cursor = Ext.isWebKit ? 'w-resize' : 'col-resize';\r
  65             } else{\r
  66                 delete this.activeHd;\r
  67                 ss.cursor = '';\r
  68             }\r
  69         }\r
  70     },\r
  71 \r
  72     onBeforeStart : function(e){\r
  73         this.dragHd = this.activeHd;\r
  74         return !!this.dragHd;\r
  75     },\r
  76 \r
  77     onStart: function(e){\r
  78         this.view.disableHeaders = true;\r
  79         this.proxy = this.view.el.createChild({cls:'x-list-resizer'});\r
  80         this.proxy.setHeight(this.view.el.getHeight());\r
  81 \r
  82         var x = this.tracker.getXY()[0],\r
  83             w = this.view.innerHd.getWidth();\r
  84 \r
  85         this.hdX = this.dragHd.getX();\r
  86         this.hdIndex = this.view.findHeaderIndex(this.dragHd);\r
  87 \r
  88         this.proxy.setX(this.hdX);\r
  89         this.proxy.setWidth(x-this.hdX);\r
  90 \r
  91         this.minWidth = w*this.minPct;\r
  92         this.maxWidth = w - (this.minWidth*(this.view.columns.length-1-this.hdIndex));\r
  93     },\r
  94 \r
  95     onDrag: function(e){\r
  96         var cursorX = this.tracker.getXY()[0];\r
  97         this.proxy.setWidth((cursorX-this.hdX).constrain(this.minWidth, this.maxWidth));\r
  98     },\r
  99 \r
 100     onEnd: function(e){\r
 101         var nw = this.proxy.getWidth();\r
 102         this.proxy.remove();\r
 103 \r
 104         var index = this.hdIndex,\r
 105             vw = this.view, \r
 106             cs = vw.columns, \r
 107             len = cs.length,\r
 108             w = this.view.innerHd.getWidth(), \r
 109             minPct = this.minPct * 100;\r
 110             pct = Math.ceil((nw * vw.maxWidth) / w),\r
 111             diff = cs[index].width - pct,\r
 112             each = Math.floor(diff / (len-1-index)),\r
 113             mod = diff - (each * (len-1-index));\r
 114 \r
 115         for(var i = index+1; i < len; i++){\r
 116             var cw = cs[i].width + each,\r
 117                 ncw = Math.max(minPct, cw);\r
 118             if(cw != ncw){\r
 119                 mod += cw - ncw;\r
 120             }\r
 121             cs[i].width = ncw;\r
 122         }\r
 123         cs[index].width = pct;\r
 124         cs[index+1].width += mod;\r
 125         delete this.dragHd;\r
 126         vw.setHdWidths();\r
 127         vw.refresh();\r
 128         setTimeout(function(){\r
 129             vw.disableHeaders = false;\r
 130         }, 100);\r
 131     }\r
 132 });</pre>
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 134 </html>