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：

    public class CollapsedOfOpacityCommand : ICommand





    {





 





        public bool CanExecute(object parameter) => true;





 





        public void Execute(object parameter)





        {





            if(parameter is UIElement element)





            {





                var engine = DoubleStoryboardEngine.Create(1, 0, 1, "Opacity");





 





                engine.Start(element);





            }





        }





 





        public event EventHandler CanExecuteChanged;





    }

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

    /// <summary> 动画引擎基类 </summary>





    public abstract class StoryboardEngineBase : IDisposable





    {





        protected Storyboard storyboard = new Storyboard();





 





        public EventHandler CompletedEvent { get; set; }





 





        public EasingFunctionBase Easing { get; set; } = EasingFunctionFactroy.PowerEase;





 





        public PropertyPath PropertyPath { get; set; }





 





        public Duration Duration { get; set; }





 





        public void Dispose()





        {





            storyboard.Completed -= CompletedEvent;





        }





 





        public abstract StoryboardEngineBase Start(UIElement element);





 





        public abstract StoryboardEngineBase Stop();





 





        public StoryboardEngineBase(int second, string property)





        {





            this.PropertyPath = new PropertyPath(property);





            this.Duration = new Duration(TimeSpan.FromSeconds(second));





        }





 





    }





 





    /// <summary> 动画泛型引擎基类 </summary>





    public abstract class StoryboardEngineBase<T> : StoryboardEngineBase





    {





        public StoryboardEngineBase(T from, T to, int second, string property) : base(second, property)





        {





            this.FromValue = from;





            this.ToValue = to;





        }





 





        public T FromValue { get; set; }





 





        public T ToValue { get; set; }





 





        //public RepeatBehavior RepeatBehavior { get; set; };





 





    }

2、开放扩展DoubleStoryboardEngine

    /// <summary> DoubleAnimation动画引擎 </summary>





    public class DoubleStoryboardEngine : StoryboardEngineBase<double>





    {





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





        {





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





        }





 





        public DoubleStoryboardEngine(double from, double to, int second, string property) : base(from, to, second, property)





        {





 





        }





 





        public override StoryboardEngineBase Start(UIElement element)





        {





            //  Do：时间线





            DoubleAnimation animation = new DoubleAnimation(1, 0, this.Duration);





 





            if (this.Easing != null)





                animation.EasingFunction = this.Easing;





 





            //if (this.RepeatBehavior != default(RepeatBehavior))





            //    animation.RepeatBehavior = (RepeatBehavior);





 





            //  Do：属性动画





            storyboard.Children.Add(animation);





            Storyboard.SetTarget(animation, element);





            Storyboard.SetTargetProperty(animation, this.PropertyPath);





 





            if (CompletedEvent != null)





                storyboard.Completed += CompletedEvent;





            storyboard.Begin();





 





            return this;





        }





 





        public override StoryboardEngineBase Stop()





        {





            this.storyboard.Stop();





 





            return this;





        }





    }

3、过度效果工厂

    /// <summary> 说明：https://docs.microsoft.com/zh-cn/dotnet/framework/wpf/graphics-multimedia/easing-functions </summary>





    public static class EasingFunctionFactroy





    {





        /// <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>





        public static PowerEase PowerEase { get; set; } = new PowerEase();





        /// <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>





        public static BackEase BackEase { get; set; } = new BackEase();





        /// <summary> ElasticEase：创建类似于弹簧来回直到静止的动画 </summary>





        public static ElasticEase ElasticEase { get; set; } = new ElasticEase();





        /// <summary> BounceEase：创建弹跳效果。 </summary>





        public static BounceEase BounceEase { get; set; } = new BounceEase();





        /// <summary> CircleEase：创建加速和/或减速使用循环函数的动画。 </summary>





        public static CircleEase CircleEase { get; set; } = new CircleEase();





 





        /// <summary> QuadraticEase：创建加速和/或减速使用的公式的动画f(t) = t2。 </summary>





        public static QuadraticEase QuadraticEase { get; set; } = new QuadraticEase();





 





        /// <summary> CubicEase：创建加速和/或减速使用的公式的动画f(t) = t3。 </summary>





        public static CubicEase CubicEase { get; set; } = new CubicEase();





        /// <summary> QuarticEase：创建加速和/或减速使用的公式的动画f(t) = t4。 </summary>





        public static QuarticEase QuarticEase { get; set; } = new QuarticEase();





        /// <summary> QuinticEase：创建加速和/或减速使用的公式的动画f(t) = t5。 </summary>





        public static QuinticEase QuinticEase { get; set; } = new QuinticEase();





 





        /// <summary> ExponentialEase：创建加速和/或减速使用指数公式的动画。 </summary>





        public static ExponentialEase ExponentialEase { get; set; } = new ExponentialEase();





 





        /// <summary> SineEase：创建加速和/或减速使用正弦公式的动画。 </summary>





        public static SineEase SineEase { get; set; } = new SineEase();





 





    }

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