docs/source/ColumnResizer.html

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