如何在后面的代码中动画变换 [英] How to Animate Transforms in code behind

问题描述

我有一个自定义按钮.出于某种原因，我想在后面的代码中应用转换.并且转换工作正常.但是当我尝试在变换上添加动画时，动画不会生效.我的代码如下.

I have a custom Button. For some reason, I would like to apply transforms in code behind. And The transforms work fine. But when I try to add animations on the transforms, the animations don't take effect. My code is as below.

    public partial class MyButton : Button
    {
        private TranslateTransform translate = new TranslateTransform() { X = 200, Y = 100 };

        public MyButton()
        {
            InitializeComponent();
            this.RenderTransform = new TransformGroup()
            {
                Children = 
                {
                    this.translate
                }
            };
        }

        protected override void OnClick()
        {
            base.OnClick();
            // Edit: I need to use Storyboard to synchronized animation1 and animation2.
            var sb = new Storyboard();
            var animation1 = new DoubleAnimation(200, -10, new Duration(new TimeSpan(0, 0, 0, 1, 0)));
            Storyboard.SetTarget(animation1, this.translate);
            Storyboard.SetTargetProperty(animation1, new PropertyPath("X"));
            sb.Children.Add(animation1);

            var animation2 = new DoubleAnimation(100, 0, new Duration(new TimeSpan(0, 0, 0, 1, 0)));
            Storyboard.SetTarget(animation2, this.translate);
            Storyboard.SetTargetProperty(animation2, new PropertyPath("Y"));
            sb.Children.Add(animation2);                
            sb.Begin(this);
        }
    }

谁能解释为什么以及如何为这个场景添加动画?

Could anyone explain why and how to add animations for this scenario?

推荐答案

OP 说他毕竟需要一个故事板.问题似乎是有时 SetTarget() 不起作用.不知道为什么，我没仔细看.我刚刚测试了解决方法，发现它很好.

OP says he needs a storyboard after all. The trouble with that seems to be that sometimes SetTarget() doesn't work. I don't know why not, I didn't look into that. I just tested the workaround, and found it good.

请注意，您必须在构造函数中执行 NameScope/RegisterName 内容.

Note that you have to do the NameScope/RegisterName stuff in the constructor.

public MyButton()
{
    InitializeComponent();

    this.RenderTransform = new TransformGroup()
    {
        Children =
        {
            this.translate
        }
    };

    NameScope.SetNameScope(this, new NameScope());
    RegisterName("translate", this.translate);
}

protected override void OnClick()
{
    base.OnClick();

    var sb = new Storyboard();
    var animation1 = new DoubleAnimation(200, -10, new Duration(new TimeSpan(0, 0, 0, 1, 0)));
    Storyboard.SetTargetName(animation1, "translate");
    Storyboard.SetTargetProperty(animation1, new PropertyPath(TranslateTransform.XProperty));
    sb.Children.Add(animation1);

    var animation2 = new DoubleAnimation(100, 0, new Duration(new TimeSpan(0, 0, 0, 1, 0)));
    Storyboard.SetTargetName(animation2, "translate");
    Storyboard.SetTargetProperty(animation2, new PropertyPath(TranslateTransform.YProperty));
    sb.Children.Add(animation2);

    sb.Begin(this);
}

简单的解决方案

您不需要使用相同的参数创建两个不同的动画.事实证明，您也不需要故事板；那是为了开始一个事件或其他东西的动画.我不知道你为什么不谷歌这个.谷歌在wpf 故事板动画..."中自动完成了它.无论如何都在这里.

protected override void OnClick()
{
    base.OnClick();

    var animation1 = new DoubleAnimation(100, 0, 
                         new Duration(new TimeSpan(0, 0, 0, 1, 0)));

    translate.BeginAnimation(TranslateTransform.XProperty, animation1);
    translate.BeginAnimation(TranslateTransform.YProperty, animation1);
}

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