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Mini Shell
Mini Shell
/*global kampfer*/
kampfer.require('events.EventTarget');
kampfer.provide('Composition');
/**
* 实现一个composition模式的类，用于组织对象，协调对象的关系。
* 涉及parent的方法(get,set)只会影响到实例对象本身，而涉及child的方法不仅会影响对象自己，
* 还会影响child实例对象。所以请使用child相关方法维护对象间的组织关系。
*/
kampfer.Composition = kampfer.events.EventTarget.extend({
//initializer : function() {},
//Composition实例
_parent : null,
//对象，每一项都应该是Composition实例
_children : null,
_childrenCount : 0,
_id : null,
setId : function(id) {
var oldId = this._id;
this._id = id;
if(this._parent && this._parent._children) {
//this._parent._children[oldId] = null;
delete _parent._children[oldId];
this._parent.addChild(this);
}
},
getId : function() {
return this._id || ( this._id = this.generateUniqueId() );
},
/**
* 设置父对象。不能将parent设置为composition自己。
* 以下情况setParent将抛出异常：
* 1. parent非null但不是一个composition实例
* 2. 尝试将parent设置为composition自己
* 3. parent非null且composition已经拥有了一个_parent且_parent!=parent
* @param {kampfer.mindMap.Composition}parent
*/
setParent : function(parent) {
if( parent && !(parent instanceof kampfer.Composition) ) {
throw('parent is not instanceof composition');
}
if( parent === this ) {
throw('parent cant be composition itself');
}
//如果parent已经存在
if( parent && this._parent && this._parent !== parent ) {
throw('parent already exist');
}
this.setParentEventTarget(parent);
this._parent = parent;
if( parent && !parent.getChild(this._id) ) {
parent.addChild(this);
}
},
getParent : function() {
return this._parent;
},
/**
* 添加子对象。
* @param {kampfer.mindMap.Composition} child
*/
addChild : function(child) {
if( !(child instanceof kampfer.Composition) ) {
throw('wrong type param');
}
var id = child.getId();
if(!this._children) {
this._children = {};
}
if(!this._children[id]) {
this._children[id] = child;
this._childrenCount++;
}else{
throw('can not add child');
}
if(child._parent !== this) {
child.setParent(this);
}
},
/**
* 删除子对象
* @param {string|kampfer.mindMap.Composition} child
*/
removeChild : function(child) {
if(child) {
var id, type = kampfer.type(child);
if(type === 'string') {
id = child;
child = this.getChild(id);
} else if(type === 'object') {
if( !(child instanceof kampfer.Composition) ) {
throw('wrong type param');
}
id = child.getId();
}
if(id && (id in this._children)) {
//this._children[id] = null;
delete this._children[id];
this._childrenCount--;
child.setParent(null);
}
if( this.hasNoChild() ) {
//this._children = null;
delete this._children;
}
}
return child;
},
getChild : function(id) {
var node;
this.eachChild(function(child, cid) {
if(cid === id) {
node = child;
return false;
}else {
child.eachChild(arguments.callee);
}
});
return node;
},
//fn(child, id)
eachChild : function(fn, context) {
if(this._children) {
for(var id in this._children) {
if( this._children[id] && fn.call( context, this._children[id], id ) === false ) {
return;
}
}
}
},
getChildrenCount : function() {
return this._childrenCount;
},
hasNoChild : function() {
if(this._childrenCount === 0) {
return true;
}
return false;
},
/*
* 生成唯一id
* 直接使用时间戳不可行
* 以下方法摘自http://www.cnblogs.com/NoRoad/archive/2010/03/12/1684759.html
*/
generateUniqueId : function() {
var guid = "";
for(var i = 1; i <= 32; i++) {
var n = Math.floor(Math.random() * 16.0).toString(16);
guid += n;
if((i == 8) || (i == 12) || (i == 16) || (i == 20)) {
guid += "-";
}
}
return guid;
},
dispose : function() {
kampfer.Composition.superClass.dispose.apply(this);
this._parent = null;
this._children = null;
}
});
Zerion Mini Shell 1.0