132 lines
5.3 KiB
Markdown
132 lines
5.3 KiB
Markdown
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### 1.触摸事件
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对于移动游戏，触摸事件是最常用的用户交互事件类型。Egret 为触摸事件设置了专门的触摸事件类`egret.TouchEvent`。
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其包含的事件类型主要有：
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* TOUCH_BEGIN：当用户第一次触摸启用触摸的设备时（例如，用手指触摸配有触摸屏的移动电话或平板电脑）触发
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* TOUCH_CANCEL：由于某个事件取消了触摸时触发
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* TOUCH_END：当用户移除与启用触摸的设备的接触时（例如，将手指从配有触摸屏的移动电话或平板电脑上抬起）触发
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* TOUCH_MOVE：当用户触碰设备并移动时进行触发，而且会连续触发，直到接触点被删除
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* TOUCH_TAP：当用户在触摸设备上与开始触摸的同一 DisplayObject 实例上抬起接触点时触发（相当与点击事件）
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在Egret中使用触摸事件时，需要打开显示对象的触摸事件开关，即将该显示对象的`touchEnabled`属性设置为`true`。代码示例如下：
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```javascript
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class TouchEventTest extends egret.DisplayObjectContainer
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{
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public constructor()
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{
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super();
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this.addEventListener(egret.Event.ADDED_TO_STAGE,this.onAddToStage,this);
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}
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private onAddToStage(event:egret.Event)
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{
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//添加显示文本
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this.drawText();
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//绘制一个透明度为1的绿色矩形，宽高为100*80
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var spr1:egret.Sprite = new egret.Sprite();
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spr1.graphics.beginFill(0x00ff00, 1);
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spr1.graphics.drawRect(0, 0, 100, 80);
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spr1.graphics.endFill();
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spr1.width = 100;
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spr1.height = 80;
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this.addChild( spr1 );
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//设置显示对象可以相应触摸事件
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spr1.touchEnabled = true;
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//注册事件
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spr1.addEventListener( egret.TouchEvent.TOUCH_TAP, this.onTouch, this );
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this.addEventListener(egret.TouchEvent.TOUCH_TAP, this.onTouchTap, this);
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this.addEventListener(egret.TouchEvent.TOUCH_TAP, this.onTouchTaps, this, true);
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}
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private onTouch( evt:egret.TouchEvent )
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{
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this.txt.text += "\n点击了spr1";
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}
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private onTouchTap( evt:egret.TouchEvent )
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{
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this.txt.text += "\n容器冒泡侦听\n---------";
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}
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private onTouchTaps( evt:egret.TouchEvent )
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{
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this.txt.text += "\n容器捕获侦听";
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}
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//绘制文本
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private txt:egret.TextField;
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private drawText():void
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{
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this.txt = new egret.TextField();
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this.txt.size = 12;
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this.txt.x = 250;
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this.txt.width = 200;
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this.txt.height = 200;
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this.txt.text = "事件文字";
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this.addChild( this.txt );
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}
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}
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```
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### 2.取消触摸事件
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取消触摸事件，在由于某个事件 取消了触摸 时触发。
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以点击事件为例，一个点击的流程一般会触发3个 touch 事件：`TouchBegin` 触摸开始，`TouchEnd` 触摸结束，`TouchTap` 点击。
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在某些特殊情况，比如 EUI 中的 `Scroller` 滚动列表，当手指点中它后，首先抛出一个 `TouchBegin`，如果此时没有滚动，直接离开屏幕，那么还是原来标准的流程，抛出 `TouchEnd` 和 `TouchTap`。但是当手指滚动它以后，则会抛出一个 `TouchCancel` 事件，而后续的 `TouchEnd` 和 `TouchTap` 事件就不会被触发了。
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下面是一个示例代码，创建一个滚动列表并增加监听
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~~~javascript
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var scroller = new eui.Scroller();
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var list = new eui.List();
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list.itemRendererSkinName = `
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<e:Skin states="up,down,disabled" minHeight="50" minWidth="100" xmlns:e="http://ns.egret.com/eui"> <e:Image width="100%" height="100%" scale9Grid="1,3,8,8" alpha.disabled="0.5"
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source="resource/button_up.png"
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source.down="resource/button_down.png"/> <e:Label text="{data}" top="8" bottom="8" left="8" right="8"
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textColor="0xFFFFFF" verticalAlign="middle" textAlign="center"/> </e:Skin>`
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var ac = new eui.ArrayCollection([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]);
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list.dataProvider = ac;
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scroller.viewport = list;
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scroller.height = 200;
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this.addChild(scroller);
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scroller.addEventListener(egret.TouchEvent.TOUCH_BEGIN,()=>{console.log("111 Scroller Begin")},this);
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list.addEventListener(egret.TouchEvent.TOUCH_BEGIN,()=>{console.log("111 List Begin")},this);
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scroller.addEventListener(egret.TouchEvent.TOUCH_END,()=>{console.log("222 Scroller END")},this);
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list.addEventListener(egret.TouchEvent.TOUCH_END,()=>{console.log("222 List END")},this);
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scroller.addEventListener(egret.TouchEvent.TOUCH_TAP,()=>{console.log("33 Scroller Tap")},this);
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list.addEventListener(egret.TouchEvent.TOUCH_TAP,()=>{console.log("33 List Tap")},this);
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scroller.addEventListener(egret.TouchEvent.TOUCH_CANCEL,()=>{console.log("44 Scroller cancel")},this);
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list.addEventListener(egret.TouchEvent.TOUCH_CANCEL,()=>{console.log("44 List cancel")},this);
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~~~
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当没有滚动，点击列表后，会依次抛出以下事件。
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~~~javascript
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111 List Begin
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111 Scroller Begin
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222 List END
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222 Scroller END
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33 List Tap
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33 Scroller Tap
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~~~
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上图为点击后的样子
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当滚动 `scroller` 以后，会抛出 `TouchCancel`，后续的 touch 事件不会被触发。
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~~~javascript
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111 List Begin
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111 Scroller Begin
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44 List cancel
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44 Scroller cancel
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~~~
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另外 `TouchCancel` 触发以后，说明触摸被取消了，本次触摸被选中的选项条也会恢复成选中前的状态。
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