示例：WPF中自定义StoryBoarService在代码中封装StoryBoard、Animation用于简化动画编写

原文:示例：WPF中自定义StoryBoarService在代码中封装StoryBoard、Animation用于简化动画编写

一、目的：通过对StoryBoard和Animation的封装来简化动画的编写

二、示例：

说明：渐隐藏是WPF中比较常用的动画，上图是通过StoryBoarService封装后的效果，在代码中只要执行如下代码即可：

DoubleStoryboardEngine.Create(1, 0, 1, "Opacity").Start(element);

上面的关闭效果可以定义一个命令如下：

1. public class CollapsedOfOpacityCommand : ICommand
2. {
4. public bool CanExecute(object parameter) => true;
6. public void Execute(object parameter)
7. {
8. if(parameter is UIElement element)
9. {
10. var engine = DoubleStoryboardEngine.Create(1, 0, 1, "Opacity");
12. engine.Start(element);
13. }
14. }
16. public event EventHandler CanExecuteChanged;
17. }

在Xaml中调用如下命令即可完成关闭渐隐藏的效果

Command="{x:Static base:CommandService.CollapsedOfOpacityCommand}"

CommandParameter="{Binding RelativeSource={RelativeSource AncestorType=GroupBox}}"

传入的CommandParmeter将会在执行命令时渐隐藏

其中动画效果的代码只需一句代码即可，简化了动画在代码中繁琐的编码过程

DoubleStoryboardEngine.Create(1, 0, 1, "Opacity").Start(element);

二、代码：

目前只实现DoubleAnimation的封装，后续将会对其他类型进行封装

1、封闭修改基类

1. /// <summary> 动画引擎基类 </summary>
2. public abstract class StoryboardEngineBase : IDisposable
3. {
4. protected Storyboard storyboard = new Storyboard();
6. public EventHandler CompletedEvent { get; set; }
8. public EasingFunctionBase Easing { get; set; } = EasingFunctionFactroy.PowerEase;
10. public PropertyPath PropertyPath { get; set; }
12. public Duration Duration { get; set; }
14. public void Dispose()
15. {
16. storyboard.Completed -= CompletedEvent;
17. }
19. public abstract StoryboardEngineBase Start(UIElement element);
21. public abstract StoryboardEngineBase Stop();
23. public StoryboardEngineBase(int second, string property)
24. {
25. this.PropertyPath = new PropertyPath(property);
26. this.Duration = new Duration(TimeSpan.FromSeconds(second));
27. }
29. }
31. /// <summary> 动画泛型引擎基类 </summary>
32. public abstract class StoryboardEngineBase<T> : StoryboardEngineBase
33. {
34. public StoryboardEngineBase(T from, T to, int second, string property) : base(second, property)
35. {
36. this.FromValue = from;
37. this.ToValue = to;
38. }
40. public T FromValue { get; set; }
42. public T ToValue { get; set; }
44. //public RepeatBehavior RepeatBehavior { get; set; };
46. }

2、开放扩展DoubleStoryboardEngine

1. /// <summary> DoubleAnimation动画引擎 </summary>
2. public class DoubleStoryboardEngine : StoryboardEngineBase<double>
3. {
4. public static DoubleStoryboardEngine Create(double from, double to, int second, string property)
5. {
6. return new DoubleStoryboardEngine(from, to, second, property);
7. }
9. public DoubleStoryboardEngine(double from, double to, int second, string property) : base(from, to, second, property)
10. {
12. }
14. public override StoryboardEngineBase Start(UIElement element)
15. {
16. // Do：时间线
17. DoubleAnimation animation = new DoubleAnimation(1, 0, this.Duration);
19. if (this.Easing != null)
20. animation.EasingFunction = this.Easing;
22. //if (this.RepeatBehavior != default(RepeatBehavior))
23. // animation.RepeatBehavior = (RepeatBehavior);
25. // Do：属性动画
26. storyboard.Children.Add(animation);
27. Storyboard.SetTarget(animation, element);
28. Storyboard.SetTargetProperty(animation, this.PropertyPath);
30. if (CompletedEvent != null)
31. storyboard.Completed += CompletedEvent;
32. storyboard.Begin();
34. return this;
35. }
37. public override StoryboardEngineBase Stop()
38. {
39. this.storyboard.Stop();
41. return this;
42. }
43. }

3、过度效果工厂

1. /// <summary> 说明：https://docs.microsoft.com/zh-cn/dotnet/framework/wpf/graphics-multimedia/easing-functions </summary>
2. public static class EasingFunctionFactroy
3. {
4. /// <summary> PowerEase：创建加速和/或减速使用的公式的动画f(t) = tp其中 p 等于Power属性。 </summary>
5. public static PowerEase PowerEase { get; set; } = new PowerEase();
6. /// <summary> BackEase：略微收回动画的动作，然后再开始进行动画处理指示的路径中。 </summary>
7. public static BackEase BackEase { get; set; } = new BackEase();
8. /// <summary> ElasticEase：创建类似于弹簧来回直到静止的动画 </summary>
9. public static ElasticEase ElasticEase { get; set; } = new ElasticEase();
10. /// <summary> BounceEase：创建弹跳效果。 </summary>
11. public static BounceEase BounceEase { get; set; } = new BounceEase();
12. /// <summary> CircleEase：创建加速和/或减速使用循环函数的动画。 </summary>
13. public static CircleEase CircleEase { get; set; } = new CircleEase();
15. /// <summary> QuadraticEase：创建加速和/或减速使用的公式的动画f(t) = t2。 </summary>
16. public static QuadraticEase QuadraticEase { get; set; } = new QuadraticEase();
18. /// <summary> CubicEase：创建加速和/或减速使用的公式的动画f(t) = t3。 </summary>
19. public static CubicEase CubicEase { get; set; } = new CubicEase();
20. /// <summary> QuarticEase：创建加速和/或减速使用的公式的动画f(t) = t4。 </summary>
21. public static QuarticEase QuarticEase { get; set; } = new QuarticEase();
22. /// <summary> QuinticEase：创建加速和/或减速使用的公式的动画f(t) = t5。 </summary>
23. public static QuinticEase QuinticEase { get; set; } = new QuinticEase();
25. /// <summary> ExponentialEase：创建加速和/或减速使用指数公式的动画。 </summary>
26. public static ExponentialEase ExponentialEase { get; set; } = new ExponentialEase();
28. /// <summary> SineEase：创建加速和/或减速使用正弦公式的动画。 </summary>
29. public static SineEase SineEase { get; set; } = new SineEase();
31. }

4、使用方法：

/// <summary> 构造方法 </summary>

        /// <param name="from"> 起始值</param>

        /// <param name="to"> 结束值  </param>

        /// <param name="second"> 间隔时间秒 </param>

        /// <param name="property"> 修改属性名称 </param>

        /// 

        public static DoubleStoryboardEngine Create(double from, double to, int second, string property)

        {

            return new DoubleStoryboardEngine(from, to, second, property);

        }

下载地址：https://github.com/HeBianGu/WPF-ControlBase.git