小編給大家分享一下WPF中如何自定義GridLengthAnimation,相信大部分人都還不怎么了解,因此分享這篇文章給大家參考一下,希望大家閱讀完這篇文章后大有收獲,下面讓我們一起去了解一下吧!
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我們想在編輯一個(gè)列表中某一個(gè)條目時(shí),將編輯的詳情內(nèi)容也放置當(dāng)前面,比如右側(cè)。
可以通過將一個(gè)Grid,分成兩個(gè)Cloumn,動(dòng)態(tài)調(diào)整兩個(gè)Cloumn的Width,就可以實(shí)現(xiàn)這個(gè)需求。
我們知道,Clomun的Width是個(gè),而默認(rèn)的動(dòng)畫沒有這樣子的。我們就需要自己實(shí)現(xiàn)這樣一人動(dòng)畫。
設(shè)計(jì)
我們從Animation的類圖上看到
我們可以從需求
我們想在編輯一個(gè)列表中某一個(gè)條目時(shí),將編輯的詳情內(nèi)容也放置當(dāng)前面,比如右側(cè)。
可以通過將一個(gè)Grid,分成兩個(gè)Cloumn,動(dòng)態(tài)調(diào)整兩個(gè)Cloumn的Width,就可以實(shí)現(xiàn)這個(gè)需求。
我們知道,Clomun的Width是個(gè)GridLength,而默認(rèn)的動(dòng)畫沒有這樣子的。我們就需要自己實(shí)現(xiàn)這樣一人動(dòng)畫。
設(shè)計(jì)
我們從Animation的類圖上看到AnimationTimeline繼承,重寫其GetCurrentValue
public class GridLengthAnimation : AnimationTimeline { /// <summary> /// Returns the type of object to animate /// </summary> public override Type TargetPropertyType => typeof(GridLength); /// <summary> /// Creates an instance of the animation object /// </summary> /// <returns>Returns the instance of the GridLengthAnimation</returns> protected override System.Windows.Freezable CreateInstanceCore() { return new GridLengthAnimation(); } /// <summary> /// Dependency property for the From property /// </summary> public static readonly DependencyProperty FromProperty = DependencyProperty.Register("From", typeof(GridLength), typeof(GridLengthAnimation)); /// <summary> /// CLR Wrapper for the From depenendency property /// </summary> public GridLength From { get { return (GridLength)GetValue(GridLengthAnimation.FromProperty); } set { SetValue(GridLengthAnimation.FromProperty, value); } } /// <summary> /// Dependency property for the To property /// </summary> public static readonly DependencyProperty ToProperty = DependencyProperty.Register("To", typeof(GridLength), typeof(GridLengthAnimation)); /// <summary> /// CLR Wrapper for the To property /// </summary> public GridLength To { get { return (GridLength)GetValue(GridLengthAnimation.ToProperty); } set { SetValue(GridLengthAnimation.ToProperty, value); } } /// <summary> /// Animates the grid let set /// </summary> /// <param name="defaultOriginValue">The original value to animate</param> /// <param name="defaultDestinationValue">The final value</param> /// <param name="animationClock">The animation clock (timer)</param> /// <returns>Returns the new grid length to set</returns> public override object GetCurrentValue(object defaultOriginValue, object defaultDestinationValue, AnimationClock animationClock) { double fromVal = ((GridLength)GetValue(GridLengthAnimation.FromProperty)).Value; double toVal = ((GridLength)GetValue(GridLengthAnimation.ToProperty)).Value; if (fromVal > toVal) return new GridLength((1 - animationClock.CurrentProgress.Value) * (fromVal - toVal) + toVal, GridUnitType.Star); else return new GridLength(animationClock.CurrentProgress.Value * (toVal - fromVal) + fromVal, GridUnitType.Star); }
如上所示,我們仿著默認(rèn)動(dòng)畫實(shí)現(xiàn)了From,To,同時(shí)將其屬性定義為GridLength,當(dāng)動(dòng)畫執(zhí)行時(shí),我們重寫了GetCurrentValue,使其根據(jù)From/To屬性相關(guān)聯(lián)。
優(yōu)化
通過以上代碼,我們實(shí)現(xiàn)了在GridLength變化時(shí),實(shí)現(xiàn)動(dòng)畫。但是,試用后我們發(fā)現(xiàn),動(dòng)畫,有點(diǎn)太線性。這個(gè)時(shí)候,怎么辦?
可以通過引入EasingFunction來實(shí)現(xiàn)。我們知道EasingFunction其實(shí)就是一個(gè)與時(shí)間t有關(guān)的時(shí)間函數(shù)f(t).通過時(shí)間函數(shù)的處理,我們使動(dòng)畫過渡不要那么線性。
/// <summary> /// The <see cref="EasingFunction" /> dependency property's name. /// </summary> public const string EasingFunctionPropertyName = "EasingFunction"; /// <summary> /// Gets or sets the value of the <see cref="EasingFunction" /> /// property. This is a dependency property. /// </summary> public IEasingFunction EasingFunction { get { return (IEasingFunction)GetValue(EasingFunctionProperty); } set { SetValue(EasingFunctionProperty, value); } } /// <summary> /// Identifies the <see cref="EasingFunction" /> dependency property. /// </summary> public static readonly DependencyProperty EasingFunctionProperty = DependencyProperty.Register( EasingFunctionPropertyName, typeof(IEasingFunction), typeof(GridLengthAnimation), new UIPropertyMetadata(null));
對應(yīng)的,還要重寫GetCurrentValue函數(shù)。
public override object GetCurrentValue(object defaultOriginValue, object defaultDestinationValue, AnimationClock animationClock) { double fromVal = ((GridLength)GetValue(FromProperty)).Value; double toVal = ((GridLength)GetValue(ToProperty)).Value; //check that from was set from the caller //if (fromVal == 1) // //set the from as the actual value // fromVal = ((GridLength)defaultDestinationValue).Value; double progress = animationClock.CurrentProgress.Value; IEasingFunction easingFunction = EasingFunction; if (easingFunction != null) { progress = easingFunction.Ease(progress); } if (fromVal > toVal) return new GridLength((1 - progress) * (fromVal - toVal) + toVal, GridUnitType.Star); return new GridLength(progress * (toVal - fromVal) + fromVal, GridUnitType.Star); }
使用
<anim:GridLengthAnimation Storyboard.TargetProperty="Width" From="0" To="*" Duration="0:0:0.5"/>
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