积少成多Flash(4) - ActionScript 3.0 实例之Hello World, 时钟, 计时器

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积少成多Flash(4) - ActionScript 3.0 实例之Hello World, 时钟, 计时器

作者：webabcd


介绍
通过3个简单的示例，对使用 Flash ActionScript 3.0 开发程序有个感性的认识

• Hello World - 演示最基本的交互。即按个按钮，就会在 UI 上显示对应的信息
• 时钟 - 演示如何做最基本的动画处理。即对时钟的时,分,秒针做旋转动画
• 计时器 - 演示稍微复杂一点的交互。即一个计时器，可以对其做启动,暂停,停止的操作

1、Hello World
UI上放置一个名为lblMsg的Label，一个名为txtName的TextInput，一个名为btnHello的Button
Greeter.as

// 包名称要与文件的目录结构对应，类名称要与文件名对应
package code
{
        /*
         * 打招呼类
         */
        public class Greeter    
        {
                /*
                 * 打招呼方法
                 * @param name                名称
                 * @return                         打招呼的结果
                 */
                public static function sayHello(name:String = "World"):String    
                {
                        return "<font color='#FFFFFF'>Hello: " + name + "</font>";
                }
        }
}

 

Hello.as

// 包
package
{
        // 导入相关的类
        import flash.display.MovieClip;
        import fl.events.ComponentEvent;
        import flash.events.TimerEvent;
        import flash.utils.Timer;
        import flash.text.TextField;
        import flash.display.SimpleButton;
        import flash.events.MouseEvent;
        import flash.events.Event;
        import flash.utils.getTimer;
        import code.Greeter;        
        
        public class Hello extends MovieClip
        {                
                // 构造函数
                public function Hello()
                {
                        InitHello();
                }
                
                /*---- Hello 的 Demo 开始 ----*/
                function InitHello()
                {
                        // 给 Label 组件的 htmlText 属性赋值
                        lblMsg.htmlText = Greeter.sayHello();

                        // 为对象增加事件处理器（第一个参数：事件类型；第二个参数：事件处理器，也就是一个方法）
                        txtName.addEventListener(ComponentEvent.ENTER, sayHello);
                        btnHello.addEventListener(ComponentEvent.BUTTON_DOWN, sayHello);
                }
                
                function sayHello(e:ComponentEvent):void    
                {
                        lblMsg.htmlText = Greeter.sayHello(txtName.text);        
                }
                /*---- Hello 的 Demo 结束 ----*/
        }
}

 

2、时钟
在UI上画3个MovieClip，分别对应时,分,秒针，分别取名为arrowHour,arrowMinute,arrowSecond
Hello.as

// 包
package
{
        // 导入相关的类
        import flash.display.MovieClip;
        import fl.events.ComponentEvent;
        import flash.events.TimerEvent;
        import flash.utils.Timer;
        import flash.text.TextField;
        import flash.display.SimpleButton;
        import flash.events.MouseEvent;
        import flash.events.Event;
        import flash.utils.getTimer;
        import code.Greeter;        
        
        public class Hello extends MovieClip
        {                
                // 构造函数
                public function Hello()
                {                        
                        InitClock();
                }
                
                /*---- 时钟的 Demo 开始 ----*/
                private var timer:Timer;
                function InitClock()
                {
                        // 实例化计时器，其参数为 tick 的间隔
                        timer = new Timer(1000);    
        
                        // 指定 onTick() 方法来处理 Timer 事件
                        timer.addEventListener(TimerEvent.TIMER, onTick);

                        // 启动计时器
                        timer.start();
                }                
                
                function onTick(event:TimerEvent):void
                {        
                        // 实例化 Date ，返回宿主服务器的当前时间
                        var now:Date = new Date();
                        
                        // rotation - 对指定对象做顺时针旋转的角度数
                        arrowHour.rotation = now.getHours() * 30 + (now.getMinutes() / 2);                
                        arrowMinute.rotation = now.getMinutes() * 6 + (now.getSeconds() / 10);        
                        arrowSecond.rotation = now.getSeconds() * 6;                
                }
                /*---- 时钟的 Demo 结束 ----*/
        }
}

 

 

3、计时器
在UI上放置4个动态文本，分别对应时,分,秒,毫秒，分别取名为txtHour,txtMinute,txtSecond,txtMillisecond。再放置3个按钮，分别对应计时器的启动,暂停,停止操作，分别取名为btnPlay,btnPause,btnStop
Hello.as

// 包
package
{
        // 导入相关的类
        import flash.display.MovieClip;
        import fl.events.ComponentEvent;
        import flash.events.TimerEvent;
        import flash.utils.Timer;
        import flash.text.TextField;
        import flash.display.SimpleButton;
        import flash.events.MouseEvent;
        import flash.events.Event;
        import flash.utils.getTimer;
        import code.Greeter;        
        
        public class Hello extends MovieClip
        {                
                // 构造函数
                public function Hello()
                {
                        InitTimer();
                }
                
                /*---- 计时器的 Demo 开始 ----*/
                // 计时器需要显示的 时,分,秒,毫秒 变量
                var hour:Number = 0;
                var minute:Number = 0;
                var second:Number = 0;
                var millisecond:Number = 0;
                
                // 计时器是否在计时
                var running:Boolean = false;
                
                // 播放器加载的总时长
                var playerLength:Number = 0;
                // 计时器暂停的总时长
                var pauseLength:Number = 0;
                // 计时器计时的总时长
                var timerLength:Number = 0;
                
                function InitTimer()
                {
                        // 设置暂停按钮初始为隐藏状态
                        btnPause.visible = false;
                        
                        // addEventListener(EventType.EVENT_NAME, eventResponse) - 为对象添加事件监听器
                        //         EventType.EVENT_NAME - 事件类型
                        //         eventResponse - 事件处理器（响应该事件的方法）
                        // 为 3 个按钮增加 Click 事件的事件处理器
                        btnPlay.addEventListener(MouseEvent.CLICK, clickHandler);
                        btnPause.addEventListener(MouseEvent.CLICK, clickHandler);
                        btnStop.addEventListener(MouseEvent.CLICK, clickHandler);
                        
                        // 每次进入此帧时的事件处理器
                        // 因为本例就 1 帧，速率为 30 fps，所以每 1/30 秒会触发一次此事件
                        this.addEventListener(Event.ENTER_FRAME, enterFrameHandler);
                }
                
                function clickHandler(event:MouseEvent):void
                {
                        // event.target - 触发此事件的对象
                        switch(event.target)
                        {
                                case btnPlay:
                                        playTimer(); // 启动计时器
                                        btnPlay.visible = false;
                                        btnPause.visible = true;
                                        break;
                                case btnPause:
                                        pauseTimer(); // 暂停计时器
                                        btnPlay.visible = true;
                                        btnPause.visible = false;
                                        break;
                                case btnStop:
                                        stopTimer(); // 停止计时器
                                        btnPlay.visible = true;
                                        btnPause.visible = false;
                                        break;
                        }        
                }
                
                function enterFrameHandler(event:Event):void
                {                        
                        if (running)    
                        {
                                // 当前计时器需要显示的时间
                                var goTime:Number = getTimer() - pauseLength - timerLength;
                        
                                // 从总的毫秒时间中解析出时间的 时,分,秒,毫秒 部分
                                // Math.floor(val:Number) - 返回小于等于指定数字的最接近的整数
                                hour = Math.floor( goTime/3600/1000 );
                                minute = Math.floor( (goTime/3600/1000 - hour) * 60 );
                                second = Math.floor( ((goTime/3600/1000 - hour) * 60 - minute) * 60 );
                                millisecond = Math.floor( goTime - (second + minute*60 + hour*3600) * 1000 );
                                
                                // 在 UI 上显示格式化后的时间
                                txtSecond.text = formatNumber(second);
                                txtMinute.text = formatNumber(minute);
                                txtHour.text = formatNumber(hour);
                                txtMillisecond.text = formatNumber2(millisecond);
                        }
                }
                
                // 停止计时器。相当于暂停计时器，然后数据归零
                function stopTimer():void
                {
                        txtHour.text = "00";
                        txtMinute.text = "00";
                        txtSecond.text = "00";
                        txtMillisecond.text = "000";
                        
                        // 计时器总的启动时长
                        timerLength = getTimer() - pauseLength;
                        
                        pauseTimer();
                }
                
                function playTimer():void
                {
                        // 计时器总的暂停时长
                        pauseLength += getTimer() - playerLength;
                        
                        running = true;
                }
                
                function pauseTimer():void
                {
                        // getTimer() - 播放器（swf）被加载后，所经过的时长。单位：毫秒
                        playerLength = getTimer();
                        
                        running = false;
                }
                
                // 格式化 时,分,秒，返回长度为两个字符的字符串
                function formatNumber(n:Number):String
                {
                        if( n < 10 )
                                return ("0" + n.toString());
                        
                        return n.toString();
                }
                
                // 格式化 毫秒，返回长度为三个字符的字符串
                function formatNumber2(n:Number):String
                {
                        if( n < 10 )
                                return ("00" + n.toString());
                        else if (n < 100)
                                return ("0" + n.toString());
                        
                        return n.toString();
                }
                /*---- 计时器的 Demo 结束 ----*/
        }
}

 

 

OK
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