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using System;
using System.Windows;
using System.Windows.Media;
using System.Windows.Media.Animation;
namespace MaterialDesignThemes.Wpf.Transitions
{
public class TransitionEffect : TransitionEffectBase
{
public TransitionEffect()
{
}
public TransitionEffect(TransitionEffectKind kind)
{
Kind = kind;
}
public TransitionEffect(TransitionEffectKind kind, TimeSpan duration)
{
Kind = kind;
Duration = duration;
}
public TransitionEffectKind Kind { get; set; }
public TimeSpan OffsetTime { get; set; } = TimeSpan.Zero;
public TimeSpan Duration { get; set; } = TimeSpan.FromMilliseconds(400);
public override Timeline Build<TSubject>(TSubject effectSubject)
{
if (effectSubject == null) throw new ArgumentNullException(nameof(effectSubject));
Timeline timeline = null;
DependencyProperty property = null;
DependencyObject target = null;
string targetName = null;
switch (Kind)
{
//we need these long winded property paths as combined storyboards wont play directly on transforms
case TransitionEffectKind.None:
break;
case TransitionEffectKind.ExpandIn:
return CreateExpandIn(effectSubject);
case TransitionEffectKind.SlideInFromLeft:
timeline = CreateSlide(-300, 0, effectSubject.Offset);
property = TranslateTransform.XProperty;
targetName = effectSubject.TranslateTransformName;
break;
case TransitionEffectKind.SlideInFromTop:
timeline = CreateSlide(-300, 0, effectSubject.Offset);
property = TranslateTransform.YProperty;
targetName = effectSubject.TranslateTransformName;
break;
case TransitionEffectKind.SlideInFromRight:
timeline = CreateSlide(300, 0, effectSubject.Offset);
property = TranslateTransform.XProperty;
targetName = effectSubject.TranslateTransformName;
break;
case TransitionEffectKind.SlideInFromBottom:
timeline = CreateSlide(300, 0, effectSubject.Offset);
property = TranslateTransform.YProperty;
targetName = effectSubject.TranslateTransformName;
break;
case TransitionEffectKind.FadeIn:
timeline = CreateFadeIn(effectSubject.Offset);
property = OpacityProperty;
target = effectSubject;
break;
default:
throw new ArgumentOutOfRangeException();
}
if (timeline == null || (target == null && targetName == null)) return null;
timeline.Duration = Duration + effectSubject.Offset;
if (target != null)
Storyboard.SetTarget(timeline, target);
if (targetName != null)
Storyboard.SetTargetName(timeline, targetName);
Storyboard.SetTargetProperty(timeline, new PropertyPath(property));
return timeline;
}
private Timeline CreateFadeIn(TimeSpan initialOffset)
{
return CreateSlide(0, 1, initialOffset);
}
private Timeline CreateSlide(double from, double to, TimeSpan initialOffset)
{
var zeroFrame = new DiscreteDoubleKeyFrame(from);
var startFrame = new DiscreteDoubleKeyFrame(from, initialOffset + OffsetTime);
var endFrame = new EasingDoubleKeyFrame(to, initialOffset + OffsetTime + Duration) { EasingFunction = new SineEase() };
var slideAnimation = new DoubleAnimationUsingKeyFrames();
slideAnimation.KeyFrames.Add(zeroFrame);
slideAnimation.KeyFrames.Add(startFrame);
slideAnimation.KeyFrames.Add(endFrame);
return slideAnimation;
}
private Timeline CreateExpandIn(ITransitionEffectSubject effectSubject)
{
var scaleXAnimation = new DoubleAnimationUsingKeyFrames();
var zeroFrame = new DiscreteDoubleKeyFrame(0.0);
var startFrame = new DiscreteDoubleKeyFrame(.5, effectSubject.Offset + OffsetTime);
var endFrame = new EasingDoubleKeyFrame(1, effectSubject.Offset + OffsetTime + Duration) { EasingFunction = new SineEase() };
scaleXAnimation.KeyFrames.Add(zeroFrame);
scaleXAnimation.KeyFrames.Add(startFrame);
scaleXAnimation.KeyFrames.Add(endFrame);
Storyboard.SetTargetName(scaleXAnimation, effectSubject.ScaleTransformName);
Storyboard.SetTargetProperty(scaleXAnimation, new PropertyPath(ScaleTransform.ScaleXProperty));
var scaleYAnimation = scaleXAnimation.Clone();
Storyboard.SetTargetName(scaleYAnimation, effectSubject.ScaleTransformName);
Storyboard.SetTargetProperty(scaleYAnimation, new PropertyPath(ScaleTransform.ScaleYProperty));
var parallelTimeline = new ParallelTimeline();
parallelTimeline.Children.Add(scaleXAnimation);
parallelTimeline.Children.Add(scaleYAnimation);
return parallelTimeline;
}
}
}
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