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);
}