日期:2014-05-18  浏览次数:21016 次

WPF DoubleAnimation播放顺序
有两个DoubleAnimation da1, da2, 他们的Duration属性不确定(时间长短不确定)
有四个Rectangle rect1, rect2, rect3, rect4,对每个rect进行透明度的变化,从1到0
C# code

da1 = new DoubleAnimation();
            duration = new Duration(TimeSpan.FromMilliseconds(getRandomTime())); // getRandomTime()返回随机的ms时间
            da1.Duration = duration;
            da1.From = 1;
            da1.To = 0;
            rect1.BeginAnimation(Rectangle.Opacity, da1);

da2 = new DoubleAnimation();
            duration = new Duration(TimeSpan.FromMilliseconds(getRandomTime())); // getRandomTime()返回随机的ms时间
            da2.Duration = duration;
            da2.From = 1;
            da2.To = 0;            
            rect2.BeginAnimation(Rectangle.Opacity, da2);


da1 = new DoubleAnimation();
            duration = new Duration(TimeSpan.FromMilliseconds(getRandomTime())); // getRandomTime()返回随机的ms时间
            da1.Duration = duration;
            da1.From = 1;
            da1.To = 0;
            rect3.BeginAnimation(Rectangle.Opacity, da1);

da2 = new DoubleAnimation();
            duration = new Duration(TimeSpan.FromMilliseconds(getRandomTime())); // getRandomTime()返回随机的ms时间
            da2.Duration = duration;
            da2.From = 1;
            da2.To = 0;            
            rect4.BeginAnimation(Rectangle.Opacity, da2);




代码执行之后,我想知道,那个Rectangle最先动作完毕(透明度变成了0),然后做进一步的其他操作。
请问我需要怎么实现呢?我在DoubleAnimation里边找到了Completed事件,但是他的sender参数是AnimationClock类型的,我也没办法从这个sender中找到他对应的da<i>或者rect<i>,请问能指点一下么?谢谢

------解决方案--------------------
刚测试过了没问题

C# code
da1 = new DoubleAnimation();
            da1.Name = "da1"; //先给个名字
            duration = new Duration(TimeSpan.FromMilliseconds(getRandomTime())); // getRandomTime()返回随机的ms时间
            da1.Duration = duration;
            da1.From = 1;
            da1.To = 0;
            da1.Completed += new EventHandler(da1_Completed);   
            rect1.BeginAnimation(Rectangle.Opacity, da1);

//在事件中判断名称就行了
        void da1_Completed(object sender, EventArgs e)
        {
            Timeline name = ((AnimationClock)sender).Timeline;
            switch (name )
            { 
                case "da1":
                    执行的方法。。。
                    break;
                case "da2":
                     执行的方法。。。
                    break;
                
            }
         }