c# - WPF:从代码动画化 TranslateTransform

Question

我有一个 WPF Canvas ，我在上面通过代码动态创建对象。这些对象正在通过设置 RenderTransform 属性进行转换，并且需要应用这些转换之一的动画。目前，我无法获取任何转换的属性以进行动画处理(尽管没有引发异常并且动画似乎在运行 - 已引发完成的事件)。

此外，如果动画系统受到压力，有时 Storyboard.Completed 事件永远不会引发。

我遇到的所有示例都对 XAML 的转换进行动画处理。 MSDN documentation建议必须将转换的 x:Name 属性设置为可动画化，但我还没有找到从代码中设置它的有效方法。

有什么想法吗？

这是重现问题的完整代码 list :

using System;
using System.Diagnostics;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;

namespace AnimationCompletedTest {
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window {

        Canvas panel;
        public MainWindow() {
            InitializeComponent();
            MouseDown += DoDynamicAnimation;

            Content = panel = new Canvas();
        }

        void DoDynamicAnimation(object sender, MouseButtonEventArgs args) {

            for (int i = 0; i < 12; ++i) {
                var e = new Ellipse {
                    Width = 16,
                    Height = 16,
                    Fill = SystemColors.HighlightBrush
                };
                Canvas.SetLeft(e, Mouse.GetPosition(this).X);
                Canvas.SetTop(e, Mouse.GetPosition(this).Y);

                var tg = new TransformGroup();
                var translation = new TranslateTransform(30, 0);
                tg.Children.Add(translation);
                tg.Children.Add(new RotateTransform(i * 30));
                e.RenderTransform = tg;

                panel.Children.Add(e);

                var s = new Storyboard();
                Storyboard.SetTarget(s, translation);
                Storyboard.SetTargetProperty(s, new PropertyPath(TranslateTransform.XProperty));

                s.Children.Add(
                    new DoubleAnimation(3, 100, new Duration(new TimeSpan(0, 0, 0, 1, 0))) {
                        EasingFunction = new PowerEase {EasingMode = EasingMode.EaseOut}
                    });

                s.Completed += 
                    (sndr, evtArgs) => {
                        Debug.WriteLine("Animation {0} completed {1}", s.GetHashCode(), Stopwatch.GetTimestamp());
                        panel.Children.Remove(e);
                    };

                Debug.WriteLine("Animation {0} started {1}", s.GetHashCode(), Stopwatch.GetTimestamp());

                s.Begin();
            }
        }

        [STAThread]
        public static void Main() {
            var app = new Application();
            app.Run(new MainWindow());
        }
    }
}

Answer 1

省略 Storyboard:

var T = new TranslateTransform(40, 0);
Duration duration = new Duration(new TimeSpan(0, 0, 0, 1, 0));
DoubleAnimation anim = new DoubleAnimation(30, duration);
T.BeginAnimation(TranslateTransform.YProperty, anim);

(语法的小修正)