WPF可以显式调用动画反向吗?

时间:2011-04-05 12:53:10

标签: c# .net wpf

WPF中的动画提供布尔参数AutoReverse。是否可以调用AutoReverse = "true"实现的功能?

我的目标是省去一些麻烦的反向动画,特别是备用很多代码。动画结束后,反向不能直接发生。


使用AutoReverse和True仅为动画设置动画的示例,但这不能按要求工作 - 它仍然会动画实际动画和反向动画。

        TranslateTransform transform = new TranslateTransform(0.0, 0.0);
        myBox.RenderTransform = transform;

        sb = new Storyboard();
        Duration dur = new Duration(TimeSpan.FromSeconds(0.5));
        DoubleAnimation shiftAnimation = new DoubleAnimation(100.0, dur);
        shiftAnimation.AutoReverse = true;
        sb.Children.Add(shiftAnimation);
        Storyboard.SetTarget(shiftAnimation, myBox);
        Storyboard.SetTargetProperty(shiftAnimation, new PropertyPath("RenderTransform.X"));

        sb.Seek(TimeSpan.FromSeconds(0.5));
        sb.Begin();

2 个答案:

答案 0 :(得分:5)

您可以将时钟设置为动画显示的100%,这样当动画开始时,它将跳过非反转部分!

编辑: 如果Duration设置为0:0:1.5,则将新时间轴应用于动画集0:0:1.5。必须将自动反转设置为打开,然后您必须启动动画。

编辑2:

TranslateTransform transform = new TranslateTransform(0.0, 0.0);
myBox.RenderTransform = transform;

sb = new Storyboard();
Duration dur = new Duration(TimeSpan.FromSeconds(0.5));
DoubleAnimation shiftAnimation = new DoubleAnimation(100.0, dur);
shiftAnimation.AutoReverse = true;
sb.Children.Add(shiftAnimation);
Storyboard.SetTarget(shiftAnimation, myBox);
Storyboard.SetTargetProperty(shiftAnimation, new PropertyPath("RenderTransform.X"));

sb.Begin();
sb.Pause();
sb.Seek(sb.Duration.TimeSpan);
sb.Resume();

答案 1 :(得分:1)

我发现以下代码运行良好:

              private bool reverse=false;
              TimeSpan animationDuration = TimeSpan.FromMilliseconds(500);
              Storyboard storyboard1 = new Storyboard();                      

              private void prepareStoryBoard(Button btn)
              {
                btn.RenderTransform = new CompositeTransform();
                DoubleAnimation animationShrink = new DoubleAnimation() { To = 0, 
                  Duration =animationDuration , FillBehavior = FillBehavior.HoldEnd };
                storyboard1.Children.Add(animationShrink);
                Storyboard.SetTarget(animationShrink, btn);
                Storyboard.SetTargetProperty(animationShrink,
                  "(Button.RenderTransform).(CompositeTransform.ScaleX)");
              }

              private void toggleAnimate()
              {
                  if(reverse==false)
                    {
                        storyboard1.AutoReverse = false;
                        storyboard1.Begin();
                        reverse=true;
                    }
                    else
                    {
                        storyboard1.AutoReverse = true;
                        storyboard1.Seek(animationDuration);
                        storyboard1.Resume();
                        reverse = false;
                    }
              }

第一次调用toggleAnimate()时,动画以正常方向执行,第二次调用toggleAnimate()时动画反转。