webix custom component-九宫格

上篇大致讲了对源码的理解，这篇展示一个初步的九宫格控件。直接上源码：

webix.protoUI({
	name:"grid",
	$init:function(config){
		config.rowCount = config.rowCount || 3;
		config.colCount = config.colCount || 3;
		if(!config.rows){
			config.rows = [];
		}
		config.rows.push({
			view:"toolbar",
			cols:[
				{id:config.id+"btn_2",view:"button",value:"2*2",align:"left",width:60,click:this._adjust},
				{id:config.id+"btn_3",view:"button",value:"3*3",align:"left",width:60,click:this._adjust},
				{id:config.id+"btn_4",view:"button",value:"4*4",align:"left",width:60,click:this._adjust},
				{id:config.id+"_i",view:"text",width:60,align:"right"},
				{view:"label",label:"*",width:20,align:"center"},
				{id:config.id+"_j",view:"text",width:60,align:"right"},
				{id:config.id+"btn_adjust",view:"button",value:"OK",align:"left",width:60,click:this._adjust},
				{},
			]
		});
		Array.prototype.push.apply(config.rows, this._initRowCol(config));
		this._settings = config;
	},
	_initRowCol:function(config){
		var rows = [];
		for(var i=0;i<config.rowCount;i++){
			rows.push({cols:[]});
			for(var j=0;j<config.colCount;j++){
				var tmp = webix.clone(config.itemTemplate);
				tmp.id = config.id+"_row"+i+"_col"+j;
				rows[i].cols.push(tmp);
			}
		}
		return rows;
	},
	_reconstruct:function(){
		this._collection = this._collection.slice(0, 1);
		var rowsConfig = this._initRowCol(this._settings);
		Array.prototype.push.apply(this._collection, rowsConfig);
		webix.ui.baselayout.prototype.reconstruct.call(this);
	},
	_adjust:function(id,e){
		var parent = this._parent_cell._parent_cell;
		var count = id.substr(id.lastIndexOf("_")+1);
		if(webix.ui.grid.prototype._isNumber.call(parent, count)){
			parent._settings.rowCount = parent._settings.colCount = count;
		} else {
			var id = parent._settings.id;
			var i = $$(id+"_i").getValue();
			var j = $$(id+"_j").getValue();
			if(!webix.ui.grid.prototype._isNumber.call(parent, i) || !webix.ui.grid.prototype._isNumber.call(parent, j)){
				webix.message("Please input number");
				return;
			}
			parent._settings.rowCount = i;
			parent._settings.colCount = j;
		}		
		webix.ui.grid.prototype._reconstruct.call(parent);
	},
	_isNumber:function(num){
		return !isNaN(parseFloat(num)) && isFinite(num);
	},
}, webix.ui.layout);

效果见这里，几个n*n的按钮在本地跑是OK的，在webix提供的这个沙盒里会出错，具体没深究。这个控件只是基于layout，动态调整config，再调用baselayout.reconstruct。可以往2方面深入下去：

1. 功能上：加入添加监控、选中当前项、绑定list等
2. 实现上：基于view自己处理render和event，这样会对原理了解的更深入，也可以学着自己实现一套简单的前端库。