packages/MaterialDesignThemes.2.5.1/src/net45/Transitions/TransitionEffect.cs

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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;