Windows 8的 - 在代码隐藏动画自定义属性 [英] Windows 8 - Animating custom property in code-behind

问题描述

基本上，我要让一堆形状，并使其动画。所以，我想出了以下自定义类：

Basically, I want to make bunch of Shapes and make them animated. So I came up with following custom class:

public class FunkyShape : DependencyObject
{
    public double Animator
    {
        get { return (double)GetValue(AnimatorProperty); }
        set { SetValue(AnimatorProperty, value); }
    }

    public static readonly DependencyProperty AnimatorProperty =
        DependencyProperty.Register("Animator", typeof(double), typeof(FunkyShape), 
        new PropertyMetadata(0, new PropertyChangedCallback(Animator_Changed)));

    private static void Animator_Changed(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        double delta = (double)e.NewValue - (double)e.OldValue;

        ((FunkyShape)d).ProcessDelta((double)e.NewValue, delta);
    }

    private void ProcessDelta(double val, double delta)
    {
        Holder.Width = val;
        Holder.Height = val;

        // Keep shape centered
        HolderPosition.X = delta / 2;
        HolderPosition.Y = delta / 2;
    }

    private Shape Holder;
    public TranslateTransform HolderPosition
    {
        get { return (TranslateTransform)Holder.RenderTransform; }
    }


    public FunkyShape(Canvas playground, Shape shapeToInit)
    {
        Holder = shapeToInit;

        Holder.Width = 10;
        Holder.Height = 10;
        Holder.Fill = new SolidColorBrush(Colors.Blue);
        Holder.HorizontalAlignment = Windows.UI.Xaml.HorizontalAlignment.Center;
        Holder.RenderTransform = new TranslateTransform()
        {
            X = 500,
            Y = 500
        };
        Holder.RenderTransformOrigin = new Point(0.5, 0.5);

        // init done
        playground.Children.Add(Holder);

        Animate();
    }

    public void Animate()
    {
        DoubleAnimation g1 = GrowAnimation();

        Storyboard sb = new Storyboard();
        Storyboard.SetTarget(g1, this);

        // CAN'T FIND ANIMATOR PROPERTY
        Storyboard.SetTargetProperty(g1, "Animator");

        sb.Children.Add(g1);

        sb.Begin(); // THROWS EXCEPTION
    }

    private static DoubleAnimation GrowAnimation()
    {
        DoubleAnimation growAnimation = new DoubleAnimation();
        growAnimation.Duration = TimeSpan.FromMilliseconds(3000);
        growAnimation.From = 0;
        growAnimation.To = 100;
        growAnimation.AutoReverse = true;
        growAnimation.EnableDependentAnimation = true;
        growAnimation.RepeatBehavior = new RepeatBehavior(5);
        return growAnimation;
    }
}

然而，当我尝试使类的一个实例并将其添加到画布上，我得到异常 - Storyboard.Being（）抛出它，并告诉我，它无法找到动画属性。

However, when I try making an instance of the class and adding it to the canvas, I get Exception - Storyboard.Being() throws it and tells me that it can't find Animator property.

所以 - 我是什么做错了

So - what am I doing wrong?

编辑：后3码的变化 - 它仍然没有工作;我得到错误的指定对象无法解析TargetProperty动画。所以，如果有人知道了答案 - 请修改代码助阵。 ！谢谢

After 3 code changes - it is still not working; I get "Cannot resolve TargetProperty Animator on specified object" error. So if somebody knows the answer - please help out by modifying the code. Thanks!

编辑：确定，24小时内撞头撞墙后有一些进步 - 如果我通过XAML添加形状它动画，但如果我通过后面（Canvas.Children.Add）代码添加它，这是行不通的。让我看看，如果我能找出原因。

OK, after 24 hours of banging head against the wall there is some progress - if I add shape through XAML it animates, but if I add it through code behind (Canvas.Children.Add), it doesn't work. Let me see if I can figure out why.

推荐答案

OK，

我发现什么明显的是框架内的一个错误（虽然我敢肯定有些员工MS将发布响应，并说这是一个功能/ IT-是按设计）的解决方法。有几件事情需要做：

I've found the workaround for what is obviously a bug within the framework (although I'm sure some MS employee will post response and say it's a feature/it-is-by-design). Several things need to be done:

1. 添加默认/无参数的构造函数


2. 更改基类FunkyShape到用户控件。


3. 打开了Page类的XAML视图，您要添加的形状


4. 添加FunkyShape的一个实例为内子画布XAML（小于TM：FunkyShape />作为例子）。 也不会工作，没有这一点。


5. 在制作FunkyShape的实例代码隐藏，将其添加到画布上，启动动画和喜欢看到它的工作原理


6. 切换到bug更少的技术。

1. Add default/parameter-less constructor
2. Change base class of FunkyShape to UserControl.
3. Open up XAML view of the Page class where you want to add shapes
4. Add one instance of FunkyShape as a child within the Canvas XAML (<tm:FunkyShape /> for example). IT WON'T WORK WITHOUT THIS.
5. Make an instance of FunkyShape in code-behind, add it to canvas, start animation and enjoy seeing it works
6. Switch to less buggy technology.

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