using System;
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namespace Microsoft.Windows.Forms.Animate
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{
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/// <summary>
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/// 动画
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/// </summary>
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/// <typeparam name="T">动画类型</typeparam>
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public abstract class Animation<T> : DisposableMini, IAnimation<T>
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{
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/// <summary>
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/// 标识动画停止的百分比
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/// </summary>
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protected const double STOPPED = 1d;
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private bool m_Stopped = true;
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/// <summary>
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/// 获取动画是否已停止
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/// </summary>
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public virtual bool Stopped
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{
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get
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{
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return this.m_Stopped;
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}
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}
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private DateTime m_StartTime;
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/// <summary>
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/// 获取动画开始时间
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/// </summary>
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public virtual DateTime StartTime
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{
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get
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{
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return this.m_StartTime;
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}
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}
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private TimeSpan m_Span;
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/// <summary>
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/// 获取或设置动画执行时间段,毫秒
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/// </summary>
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public virtual int Span
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{
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get
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{
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return (int)this.m_Span.TotalMilliseconds;
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}
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set
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{
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this.m_Span = new TimeSpan(0, 0, 0, 0, value);
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}
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}
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/// <summary>
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/// 获取当前帧
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/// </summary>
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public abstract T Current
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{
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get;
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}
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/// <summary>
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/// 获取动画完成百分比,如果等于 1 标志已结束
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/// </summary>
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protected virtual double Percentage
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{
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get
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{
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if (this.m_Stopped)
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return STOPPED;
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DateTime now = DateTime.Now;
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if (now >= this.m_StartTime + this.m_Span)
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{
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this.m_Stopped = true;
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return STOPPED;
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}
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return (now - this.m_StartTime).TotalMilliseconds / this.m_Span.TotalMilliseconds;
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}
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}
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/// <summary>
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/// 开始动画
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/// </summary>
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protected virtual void Start()
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{
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this.m_Stopped = false;
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this.m_StartTime = DateTime.Now;
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}
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/// <summary>
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/// 停止动画
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/// </summary>
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protected virtual void Stop()
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{
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this.m_Stopped = true;
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}
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}
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}
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