extjs3.1重写GroupingView实现分组全选

//支持Ext.grid.GroupingView 分组全选
	Ext.override(Ext.grid.GroupingView,{
	 initTemplates : function(){
	        Ext.grid.GroupingView.superclass.initTemplates.call(this);
	        this.state = {};

	        var sm = this.grid.getSelectionModel();
	        sm.on(sm.selectRow ? 'beforerowselect' : 'beforecellselect',
	                this.onBeforeRowSelect, this);

	        if(!this.startGroup){
	        	var selectDiv='';
	        	if(sm.header)
	        	selectDiv = '<div class="x-grid3-hd-inner x-grid3-hd-checker" unselectable="on" style="width:20px;float:left;padding:0"><div class="x-grid3-hd-checker" groupid="{groupId}">&nbsp;</div></div>'
	            this.startGroup = new Ext.XTemplate(
	                '<div id="{groupId}" class="x-grid-group {cls}">',
	                    '<div id="{groupId}-hd" class="x-grid-group-hd" style="{style}"><div class="x-grid-group-title">',selectDiv, this.groupTextTpl ,'</div></div>',
	                    '<div id="{groupId}-bd" class="x-grid-group-body">'
	            );
	        }
	        this.startGroup.compile();
	        if(!this.endGroup){
	            this.endGroup = '</div></div>';
	        }

	        this.endGroup = '</div></div>';
	    },
	 interceptMouse : function(e){
	        var hd = e.getTarget('.x-grid-group-hd', this.mainBody);
	        if(hd){
	            e.stopEvent();
	            var che = e.getTarget('.x-grid3-hd-checker', this.mainBody);
	            if(che){
					this.toggleGroup(hd.parentNode,true);
					this.toggleSelectGroup(che);
				}else
	            this.toggleGroup(hd.parentNode);
	        }
	    },
	    toggleSelectGroup : function(che){
			var phd = Ext.fly(che.parentNode);
	        var isChecked = phd.hasClass('x-grid3-hd-checker-on');
			var groupId = che.attributes.groupid.value;
			var arr = groupId.split('-');
			var groupFiled = arr[arr.length-2];
			var groupValue = arr[arr.length-1];
			var s = this.grid.store;
	            if(isChecked){
	            	phd.removeClass('x-grid3-hd-checker-on');
	                for(i=0;i<s.getCount();i++){
	                	if(s.getAt(i).get(groupFiled)==groupValue)
	                	this.grid.selModel.deselectRow(i);
					}
	            }else{
	            	phd.addClass('x-grid3-hd-checker-on');
					 for(i=0;i<s.getCount();i++){
						 if(s.getAt(i).get(groupFiled)==groupValue)
						 this.grid.selModel.selectRow(i,true);
					}
	                
	            }
			
		}