cocos creator Touch事件应用(触控选择多个子节点的实例)

cc.Class({
 extends: cc.Component,

 properties: {
  // foo: {
  // default: null,  // The default value will be used only when the component attaching
  //       to a node for the first time
  // url: cc.Texture2D, // optional, default is typeof default
  // serializable: true, // optional, default is true
  // visible: true,  // optional, default is true
  // displayName: 'Foo', // optional
  // readonly: false, // optional, default is false
  // },
  // ...
   poker:{
    default:null,
    type:cc.Node
   },
   cardMask:{
    default:null,
    type: cc.Prefab
   }
 },

 // use this for initialization
 onLoad: function () {
   
   //牌
   this.cards = this.poker.children;

   //牌初始位置
   this.cardInitY = this.cards[0].y;

   //触摸选择到的牌
   this.touchedCards = [];

   //选中的牌
   this.selectedCards = [];

   console.info(this.cards);
  },
  
  start: function () {
   // this.cards = this.poker.children;
   // console.info(this.cards);
   
   this.addTouchEvent();
  },

  /**
   * 添加事件
   */
  addTouchEvent:function(){

   //父节点监听touch事件（直接子节点必须注册同样的事件方能触发）
   this.poker.on(cc.Node.EventType.TOUCH_START, function (event) {
    console.log('poker TOUCH_START');
    
    //牌
    var card = event.target;
    
    //起始触摸位置（和第一张card一样，相对于poker的位置）
    this.touchStartLocation = this.cards[0].convertTouchToNodeSpace(event);
    console.log('touch start Location:'+ JSON.stringify(this.touchStartLocation));
    
    //计算牌位置
    var index = 0;
    for(var i=0;i<this.cards.length;i++){
     var c = this.cards[i];
     if(c.name == card.name){
      index = i;
      break;
     }
    }

    //暂存第一次触摸到的牌
    var touchedCard = {
     index:index,
     card:card
    };
    this.firstTouchedCard = touchedCard;
    //暂存
    this.pushTouchedCards(touchedCard.index,touchedCard.card);

   }, this);
  
   //父节点监听touch事件（直接子节点必须注册同样的事件方能触发）
   this.poker.on(cc.Node.EventType.TOUCH_MOVE, function (event) {
    console.log('poker TOUCH_MOVE');
    //先清除原先触摸到的牌
    this.clearTouchedCards();
    //保存第一张牌
    this.pushTouchedCards(this.firstTouchedCard.index,this.firstTouchedCard.card);

    //触摸点转换为card节点坐标
    var nodeLocation = this.cards[0].convertTouchToNodeSpace(event);
    console.log('touch nodeLocation:'+ JSON.stringify(nodeLocation));
    var x = nodeLocation.x;
    var y = nodeLocation.y; 

    //找到当前选中的牌
    var currentCard = null;
    for(var i=0;i< this.cards.length;i++){
     var card = this.cards[i];
     var cardX = card.x;
     var cardY = card.y;
     console.log('card x='+cardX+',y='+cardY);


     //某张牌范围包括了鼠标位置，选中此牌与触摸开头的所有牌
     var cardWidth = i==5 ? card.width:19;
     var cardHeight = card.height;
     if(cardX<=x && x <= cardX+cardWidth && cardY<=y && y<= cardY+cardHeight){
      currentCard = card;
    
      //暂存触摸到的牌
      this.pushTouchedCards(i,card);
      
      break;
     }
    }
    
    //添加开头与此牌直接的所有牌
    var startTouchLocation = this.touchStartLocation;
    for(var i=0;i< this.cards.length;i++){
     var card = this.cards[i];
     var cardX = card.x;
     //框选的范围包括了的牌
     var min,max;
     if(startTouchLocation.x < nodeLocation.x){
      min = startTouchLocation.x;
      max = nodeLocation.x;
     }else{
      min = nodeLocation.x;
      max = startTouchLocation.x;
     }
     console.log('min='+min+', max='+max);

     if(min <= cardX && cardX <= max){
      //暂存触摸到的牌
      this.pushTouchedCards(i,card);
     }
    }
    

   }, this);
  
  //父节点监听touch事件（直接子节点必须注册同样的事件方能触发）
  this.poker.on(cc.Node.EventType.TOUCH_END, function (event) {
   console.log('poker TOUCH_END');
   this.doSelectCard();
  }, this);
  
  //父节点监听touch事件（直接子节点必须注册同样的事件方能触发）
  this.poker.on(cc.Node.EventType.TOUCH_CANCEL, function (event) {
   console.log('poker TOUCH_CANCEL');
   this.doSelectCard();
  }, this);
  
  //给所有的牌注册事件，会自动冒泡到poker节点
  for(var i=0;i< this.cards.length;i++){
   var cards = this.cards;
   //闭包传递i值
   (function(i){
    var card = cards[i];
    card.on(cc.Node.EventType.TOUCH_START, function (event) {
     console.log('card TOUCH_START');
    }, card);
    
    card.on(cc.Node.EventType.TOUCH_MOVE, function (event) {
     console.log('card TOUCH_MOVE');
    }, card);

    card.on(cc.Node.EventType.TOUCH_END, function (event) {
     console.log('card TOUCH_END');
    }, card);
 
    card.on(cc.Node.EventType.TOUCH_CANCEL, function (event) {
     console.log('card TOUCH_CANCEL');
    }, card);

   
   })(i)
   
  }
  
 },

 /**
  * 暂存触摸到的牌
  */
 pushTouchedCards:function(index,card){
  //构造牌对象
  var cardObj = {
   index:index,
   name:card.name,
   isSelected:card.y==this.cardInitY?false:true //高度不一样，表示选中
  };
  
  //防止重复添加
  var existCard = this.touchedCards.find(function(obj){
   if(obj.name == card.name){
    return obj;
   }else{
    return null;
   }
  });
  if(!existCard){
   //添加暂存
   this.touchedCards.push(cardObj);

   //包含提示
   this.addCardMask(card);
  }
 },

 /**
  * 清除原先暂存的触摸到的牌
  */
 clearTouchedCards:function(){
  for(var i=0;i<this.touchedCards.length;i++){
   var cardIndex = this.touchedCards[i].index;
   var card = this.cards[cardIndex];
   card.removeChild(card.children[0]);
  }
  this.touchedCards = [];
 },

 /**
  * 选择牌
  */
 doSelectCard:function(){
  this.selectedCards = [];

  console.log(this.touchedCards);

  //改变牌状态
  for(var i = 0; i< this.touchedCards.length;i++){
   var cardObj = this.touchedCards[i];
   var card = this.cards[cardObj.index];
   if(cardObj.isSelected){ //如果是选中改为不选中
    card.y = card.y - 30;
   }else{ //不选中改为选中状态
    card.y = card.y + 30;
   }
  }

  //重置
  this.clearTouchedCards();

  //显示选中的牌
  this.showSelectedCards();
 },

 /**
  * 包含牌遮罩
  */
 addCardMask:function(card){
  var cardMask = cc.instantiate(this.cardMask);
  cardMask.setPosition(cc.p(0, 0));
  card.addChild(cardMask);
  },

 /**
 * 显示选中的牌
 */
 showSelectedCards:function(){
  this.selectedCards = [];
  for(var i=0;i< this.cards.length;i++){
   var card = this.cards[i];
   var isSelected = card.y==this.cardInitY?false:true;
   if(isSelected){
    this.selectedCards.push(card.name);
   }
  }
  //输出
  console.info("selected cards is: "+ JSON.stringify(this.selectedCards));
 },

 
 // called every frame, uncomment this function to activate update callback
 // update: function (dt) {

 // },
});