src/widgets/list/ColumnResizer.js

   1 /*!
   2  * Ext JS Library 3.0.3
   3  * Copyright(c) 2006-2009 Ext JS, LLC
   4  * licensing@extjs.com
   5  * http://www.extjs.com/license
   6  */
   7 /**\r
   8  * @class Ext.ListView.ColumnResizer\r
   9  * @extends Ext.util.Observable\r
  10  * <p>Supporting Class for Ext.ListView.</p>\r
  11  * @constructor\r
  12  * @param {Object} config\r
  13  */\r
  14 Ext.ListView.ColumnResizer = Ext.extend(Ext.util.Observable, {\r
  15     /**\r
  16      * @cfg {Number} minPct The minimum percentage to allot for any column (defaults to <tt>.05</tt>)\r
  17      */\r
  18     minPct: .05,\r
  19 \r
  20     constructor: function(config){\r
  21         Ext.apply(this, config);\r
  22         Ext.ListView.ColumnResizer.superclass.constructor.call(this);\r
  23     },\r
  24     init : function(listView){\r
  25         this.view = listView;\r
  26         listView.on('render', this.initEvents, this);\r
  27     },\r
  28 \r
  29     initEvents : function(view){\r
  30         view.mon(view.innerHd, 'mousemove', this.handleHdMove, this);\r
  31         this.tracker = new Ext.dd.DragTracker({\r
  32             onBeforeStart: this.onBeforeStart.createDelegate(this),\r
  33             onStart: this.onStart.createDelegate(this),\r
  34             onDrag: this.onDrag.createDelegate(this),\r
  35             onEnd: this.onEnd.createDelegate(this),\r
  36             tolerance: 3,\r
  37             autoStart: 300\r
  38         });\r
  39         this.tracker.initEl(view.innerHd);\r
  40         view.on('beforedestroy', this.tracker.destroy, this.tracker);\r
  41     },\r
  42 \r
  43     handleHdMove : function(e, t){\r
  44         var hw = 5,\r
  45             x = e.getPageX(),\r
  46             hd = e.getTarget('em', 3, true);\r
  47         if(hd){\r
  48             var r = hd.getRegion(),\r
  49                 ss = hd.dom.style,\r
  50                 pn = hd.dom.parentNode;\r
  51 \r
  52             if(x - r.left <= hw && pn != pn.parentNode.firstChild){\r
  53                 this.activeHd = Ext.get(pn.previousSibling.firstChild);\r
  54                                 ss.cursor = Ext.isWebKit ? 'e-resize' : 'col-resize';\r
  55             } else if(r.right - x <= hw && pn != pn.parentNode.lastChild.previousSibling){\r
  56                 this.activeHd = hd;\r
  57                                 ss.cursor = Ext.isWebKit ? 'w-resize' : 'col-resize';\r
  58             } else{\r
  59                 delete this.activeHd;\r
  60                 ss.cursor = '';\r
  61             }\r
  62         }\r
  63     },\r
  64 \r
  65     onBeforeStart : function(e){\r
  66         this.dragHd = this.activeHd;\r
  67         return !!this.dragHd;\r
  68     },\r
  69 \r
  70     onStart: function(e){\r
  71         this.view.disableHeaders = true;\r
  72         this.proxy = this.view.el.createChild({cls:'x-list-resizer'});\r
  73         this.proxy.setHeight(this.view.el.getHeight());\r
  74 \r
  75         var x = this.tracker.getXY()[0],\r
  76             w = this.view.innerHd.getWidth();\r
  77 \r
  78         this.hdX = this.dragHd.getX();\r
  79         this.hdIndex = this.view.findHeaderIndex(this.dragHd);\r
  80 \r
  81         this.proxy.setX(this.hdX);\r
  82         this.proxy.setWidth(x-this.hdX);\r
  83 \r
  84         this.minWidth = w*this.minPct;\r
  85         this.maxWidth = w - (this.minWidth*(this.view.columns.length-1-this.hdIndex));\r
  86     },\r
  87 \r
  88     onDrag: function(e){\r
  89         var cursorX = this.tracker.getXY()[0];\r
  90         this.proxy.setWidth((cursorX-this.hdX).constrain(this.minWidth, this.maxWidth));\r
  91     },\r
  92 \r
  93     onEnd: function(e){\r
  94         var nw = this.proxy.getWidth();\r
  95         this.proxy.remove();\r
  96 \r
  97         var index = this.hdIndex,\r
  98             vw = this.view, \r
  99             cs = vw.columns, \r
 100             len = cs.length,\r
 101             w = this.view.innerHd.getWidth(), \r
 102             minPct = this.minPct * 100;\r
 103             pct = Math.ceil((nw * vw.maxWidth) / w),\r
 104             diff = cs[index].width - pct,\r
 105             each = Math.floor(diff / (len-1-index)),\r
 106             mod = diff - (each * (len-1-index));\r
 107 \r
 108         for(var i = index+1; i < len; i++){\r
 109             var cw = cs[i].width + each,\r
 110                 ncw = Math.max(minPct, cw);\r
 111             if(cw != ncw){\r
 112                 mod += cw - ncw;\r
 113             }\r
 114             cs[i].width = ncw;\r
 115         }\r
 116         cs[index].width = pct;\r
 117         cs[index+1].width += mod;\r
 118         delete this.dragHd;\r
 119         vw.setHdWidths();\r
 120         vw.refresh();\r
 121         setTimeout(function(){\r
 122             vw.disableHeaders = false;\r
 123         }, 100);\r
 124     }\r
 125 });