Alien-Web-ExtJS-V3
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  <pre class="prettyprint lang-js">// private
// This is a support class used internally by the Grid components
Ext.grid.HeaderDragZone = Ext.extend(Ext.dd.DragZone, {
    maxDragWidth: 120,
    
    constructor : function(grid, hd, hd2){
        this.grid = grid;
        this.view = grid.getView();
        this.ddGroup = &quot;gridHeader&quot; + this.grid.getGridEl().id;
        Ext.grid.HeaderDragZone.superclass.constructor.call(this, hd);
        if(hd2){
            this.setHandleElId(Ext.id(hd));
            this.setOuterHandleElId(Ext.id(hd2));
        }
        this.scroll = false;
    },
    
    getDragData : function(e){
        var t = Ext.lib.Event.getTarget(e),
            h = this.view.findHeaderCell(t);
        if(h){
            return {ddel: h.firstChild, header:h};
        }
        return false;
    },

    onInitDrag : function(e){
        // keep the value here so we can restore it;
        this.dragHeadersDisabled = this.view.headersDisabled;
        this.view.headersDisabled = true;
        var clone = this.dragData.ddel.cloneNode(true);
        clone.id = Ext.id();
        clone.style.width = Math.min(this.dragData.header.offsetWidth,this.maxDragWidth) + &quot;px&quot;;
        this.proxy.update(clone);
        return true;
    },

    afterValidDrop : function(){
        this.completeDrop();
    },

    afterInvalidDrop : function(){
        this.completeDrop();
    },
    
    completeDrop: function(){
        var v = this.view,
            disabled = this.dragHeadersDisabled;
        setTimeout(function(){
            v.headersDisabled = disabled;
        }, 50);
    }
});

// private
// This is a support class used internally by the Grid components
Ext.grid.HeaderDropZone = Ext.extend(Ext.dd.DropZone, {
    proxyOffsets : [-4, -9],
    fly: Ext.Element.fly,
    
    constructor : function(grid, hd, hd2){
        this.grid = grid;
        this.view = grid.getView();
        // split the proxies so they don't interfere with mouse events
        this.proxyTop = Ext.DomHelper.append(document.body, {
            cls:&quot;col-move-top&quot;, html:&quot;&amp;#160;&quot;
        }, true);
        this.proxyBottom = Ext.DomHelper.append(document.body, {
            cls:&quot;col-move-bottom&quot;, html:&quot;&amp;#160;&quot;
        }, true);
        this.proxyTop.hide = this.proxyBottom.hide = function(){
            this.setLeftTop(-100,-100);
            this.setStyle(&quot;visibility&quot;, &quot;hidden&quot;);
        };
        this.ddGroup = &quot;gridHeader&quot; + this.grid.getGridEl().id;
        // temporarily disabled
        //Ext.dd.ScrollManager.register(this.view.scroller.dom);
        Ext.grid.HeaderDropZone.superclass.constructor.call(this, grid.getGridEl().dom);
    },

    getTargetFromEvent : function(e){
        var t = Ext.lib.Event.getTarget(e),
            cindex = this.view.findCellIndex(t);
        if(cindex !== false){
            return this.view.getHeaderCell(cindex);
        }
    },

    nextVisible : function(h){
        var v = this.view, cm = this.grid.colModel;
        h = h.nextSibling;
        while(h){
            if(!cm.isHidden(v.getCellIndex(h))){
                return h;
            }
            h = h.nextSibling;
        }
        return null;
    },

    prevVisible : function(h){
        var v = this.view, cm = this.grid.colModel;
        h = h.prevSibling;
        while(h){
            if(!cm.isHidden(v.getCellIndex(h))){
                return h;
            }
            h = h.prevSibling;
        }



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