using System;
using System.Collections.Generic;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
using System.Windows.Data;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Media.Effects;
using System.Windows.Media.Imaging;
using HandyControl.Data;

namespace HandyControl.Interactivity
{
    public class ExtendedVisualStateManager : VisualStateManager
    {
        // Fields
        internal static readonly DependencyProperty CachedBackgroundProperty =
            DependencyProperty.RegisterAttached("CachedBackground", typeof(object), typeof(ExtendedVisualStateManager),
                new PropertyMetadata(null));

        internal static readonly DependencyProperty CachedEffectProperty =
            DependencyProperty.RegisterAttached("CachedEffect", typeof(Effect), typeof(ExtendedVisualStateManager),
                new PropertyMetadata(null));

        private static readonly List<DependencyProperty> ChildAffectingLayoutProperties;

        internal static readonly DependencyProperty CurrentStateProperty =
            DependencyProperty.RegisterAttached("CurrentState", typeof(VisualState), typeof(ExtendedVisualStateManager),
                new PropertyMetadata(null));

        internal static readonly DependencyProperty DidCacheBackgroundProperty =
            DependencyProperty.RegisterAttached("DidCacheBackground", typeof(bool), typeof(ExtendedVisualStateManager),
                new PropertyMetadata(ValueBoxes.FalseBox));

        private static readonly List<DependencyProperty> LayoutProperties;

        internal static readonly DependencyProperty LayoutStoryboardProperty =
            DependencyProperty.RegisterAttached("LayoutStoryboard", typeof(Storyboard),
                typeof(ExtendedVisualStateManager), new PropertyMetadata(null));

        private static Storyboard LayoutTransitionStoryboard;
        private static List<FrameworkElement> MovingElements;

        internal static readonly DependencyProperty OriginalLayoutValuesProperty =
            DependencyProperty.RegisterAttached("OriginalLayoutValues", typeof(List<OriginalLayoutValueRecord>),
                typeof(ExtendedVisualStateManager), new PropertyMetadata(null));

        public static readonly DependencyProperty RuntimeVisibilityPropertyProperty =
            DependencyProperty.RegisterAttached("RuntimeVisibilityProperty", typeof(DependencyProperty),
                typeof(ExtendedVisualStateManager), new PropertyMetadata(null));

        public static readonly DependencyProperty TransitionEffectProperty =
            DependencyProperty.RegisterAttached("TransitionEffect", typeof(TransitionEffect),
                typeof(ExtendedVisualStateManager), new PropertyMetadata(null));

        internal static readonly DependencyProperty TransitionEffectStoryboardProperty =
            DependencyProperty.RegisterAttached("TransitionEffectStoryboard", typeof(Storyboard),
                typeof(ExtendedVisualStateManager), new PropertyMetadata(null));

        public static readonly DependencyProperty UseFluidLayoutProperty =
            DependencyProperty.RegisterAttached("UseFluidLayout", typeof(bool), typeof(ExtendedVisualStateManager),
                new PropertyMetadata(ValueBoxes.FalseBox));

        private bool _changingState;

        // Methods
        static ExtendedVisualStateManager()
        {
            var list = new List<DependencyProperty>
            {
                Grid.ColumnProperty,
                Grid.ColumnSpanProperty,
                Grid.RowProperty,
                Grid.RowSpanProperty,
                Canvas.LeftProperty,
                Canvas.TopProperty,
                FrameworkElement.WidthProperty,
                FrameworkElement.HeightProperty,
                FrameworkElement.MinWidthProperty,
                FrameworkElement.MinHeightProperty,
                FrameworkElement.MaxWidthProperty,
                FrameworkElement.MaxHeightProperty,
                FrameworkElement.MarginProperty,
                FrameworkElement.HorizontalAlignmentProperty,
                FrameworkElement.VerticalAlignmentProperty,
                UIElement.VisibilityProperty,
                StackPanel.OrientationProperty
            };
            LayoutProperties = list;
            var list2 = new List<DependencyProperty>
            {
                StackPanel.OrientationProperty
            };
            ChildAffectingLayoutProperties = list2;
        }

        // Properties
        public static bool IsRunningFluidLayoutTransition =>
            LayoutTransitionStoryboard != null;

        private static void AnimateTransitionEffect(FrameworkElement stateGroupsRoot, VisualTransition transition)
        {
            var element = new DoubleAnimation
            {
                Duration = transition.GeneratedDuration,
                EasingFunction = transition.GeneratedEasingFunction,
                From = 0.0,
                To = 1.0
            };
            var sb = new Storyboard
            {
                Duration = transition.GeneratedDuration,
                Children = {element}
            };
            Storyboard.SetTarget(element, stateGroupsRoot);
            Storyboard.SetTargetProperty(element,
                new PropertyPath("(0).(1)", UIElement.EffectProperty, TransitionEffect.ProgressProperty));
            if (stateGroupsRoot is Panel panel && panel.Background == null)
            {
                SetDidCacheBackground(panel, true);
                TransferLocalValue(panel, Panel.BackgroundProperty, CachedBackgroundProperty);
                panel.Background = Brushes.Transparent;
            }
            sb.Completed += delegate
            {
                if (Equals(GetTransitionEffectStoryboard(stateGroupsRoot), sb))
                    FinishTransitionEffectAnimation(stateGroupsRoot);
            };
            SetTransitionEffectStoryboard(stateGroupsRoot, sb);
            sb.Begin();
        }

        private static object CacheLocalValueHelper(DependencyObject dependencyObject, DependencyProperty property)
        {
            return dependencyObject.ReadLocalValue(property);
        }

        private static void control_LayoutUpdated(object sender, EventArgs e)
        {
            if (LayoutTransitionStoryboard != null)
                foreach (var element in MovingElements)
                {
                    if (element.Parent is WrapperCanvas parent)
                    {
                        var layoutRect = GetLayoutRect(parent);
                        var newRect = parent.NewRect;
                        var renderTransform = parent.RenderTransform as TranslateTransform;
                        var num = renderTransform?.X ?? 0.0;
                        var num2 = renderTransform?.Y ?? 0.0;
                        var num3 = newRect.Left - layoutRect.Left;
                        var num4 = newRect.Top - layoutRect.Top;
                        if (Math.Abs(num - num3) > 0.001 || Math.Abs(num2 - num4) > 0.001)
                        {
                            if (renderTransform == null)
                            {
                                renderTransform = new TranslateTransform();
                                parent.RenderTransform = renderTransform;
                            }
                            renderTransform.X = num3;
                            renderTransform.Y = num4;
                        }
                    }
                }
        }

        private static void CopyLayoutProperties(FrameworkElement source, FrameworkElement target, bool restoring)
        {
            var canvas = restoring ? (WrapperCanvas) source : (WrapperCanvas) target;
            if (canvas.LocalValueCache == null)
                canvas.LocalValueCache = new Dictionary<DependencyProperty, object>();
            foreach (var property in LayoutProperties)
                if (!ChildAffectingLayoutProperties.Contains(property))
                    if (restoring)
                    {
                        ReplaceCachedLocalValueHelper(target, property, canvas.LocalValueCache[property]);
                    }
                    else
                    {
                        var obj2 = target.GetValue(property);
                        var obj3 = CacheLocalValueHelper(source, property);
                        canvas.LocalValueCache[property] = obj3;
                        if (IsVisibilityProperty(property))
                            canvas.DestinationVisibilityCache = (Visibility) source.GetValue(property);
                        else
                            target.SetValue(property, source.GetValue(property));
                        source.SetValue(property, obj2);
                    }
        }

        private static Storyboard CreateLayoutTransitionStoryboard(VisualTransition transition,
            List<FrameworkElement> movingElements, Dictionary<FrameworkElement, double> oldOpacities)
        {
            var duration = transition?.GeneratedDuration ?? new Duration(TimeSpan.Zero);
            var generatedEasingFunction = transition?.GeneratedEasingFunction;
            var storyboard = new Storyboard
            {
                Duration = duration
            };
            foreach (var element in movingElements)
            {
                if (element.Parent is WrapperCanvas parent)
                {
                    var animation = new DoubleAnimation
                    {
                        From = 1.0,
                        To = 0.0,
                        Duration = duration,
                        EasingFunction = generatedEasingFunction
                    };
                    Storyboard.SetTarget(animation, parent);
                    Storyboard.SetTargetProperty(animation, new PropertyPath(WrapperCanvas.SimulationProgressProperty));
                    storyboard.Children.Add(animation);
                    parent.SimulationProgress = 1.0;
                    var newRect = parent.NewRect;
                    if (!IsClose(parent.Width, newRect.Width))
                    {
                        var animation3 = new DoubleAnimation
                        {
                            From = newRect.Width,
                            To = newRect.Width,
                            Duration = duration
                        };
                        Storyboard.SetTarget(animation3, parent);
                        Storyboard.SetTargetProperty(animation3, new PropertyPath(FrameworkElement.WidthProperty));
                        storyboard.Children.Add(animation3);
                    }
                    if (!IsClose(parent.Height, newRect.Height))
                    {
                        var animation5 = new DoubleAnimation
                        {
                            From = newRect.Height,
                            To = newRect.Height,
                            Duration = duration
                        };
                        Storyboard.SetTarget(animation5, parent);
                        Storyboard.SetTargetProperty(animation5, new PropertyPath(FrameworkElement.HeightProperty));
                        storyboard.Children.Add(animation5);
                    }
                    if (parent.DestinationVisibilityCache == Visibility.Collapsed)
                    {
                        var margin = parent.Margin;
                        if (!IsClose(margin.Left, 0.0) || !IsClose(margin.Top, 0.0) || !IsClose(margin.Right, 0.0) ||
                            !IsClose(margin.Bottom, 0.0))
                        {
                            var frames = new ObjectAnimationUsingKeyFrames
                            {
                                Duration = duration
                            };
                            var frame2 = new DiscreteObjectKeyFrame
                            {
                                KeyTime = TimeSpan.Zero
                            };
                            var thickness2 = new Thickness();
                            frame2.Value = thickness2;
                            var keyFrame = frame2;
                            frames.KeyFrames.Add(keyFrame);
                            Storyboard.SetTarget(frames, parent);
                            Storyboard.SetTargetProperty(frames, new PropertyPath(FrameworkElement.MarginProperty));
                            storyboard.Children.Add(frames);
                        }
                        if (!IsClose(parent.MinWidth, 0.0))
                        {
                            var animation7 = new DoubleAnimation
                            {
                                From = 0.0,
                                To = 0.0,
                                Duration = duration
                            };
                            Storyboard.SetTarget(animation7, parent);
                            Storyboard.SetTargetProperty(animation7,
                                new PropertyPath(FrameworkElement.MinWidthProperty));
                            storyboard.Children.Add(animation7);
                        }
                        if (!IsClose(parent.MinHeight, 0.0))
                        {
                            var animation9 = new DoubleAnimation
                            {
                                From = 0.0,
                                To = 0.0,
                                Duration = duration
                            };
                            Storyboard.SetTarget(animation9, parent);
                            Storyboard.SetTargetProperty(animation9,
                                new PropertyPath(FrameworkElement.MinHeightProperty));
                            storyboard.Children.Add(animation9);
                        }
                    }
                }
            }
            foreach (var element2 in oldOpacities.Keys)
            {
                if (element2.Parent is WrapperCanvas canvas2)
                {
                    var a = oldOpacities[element2];
                    var num2 = canvas2.DestinationVisibilityCache == Visibility.Visible ? 1.0 : 0.0;
                    if (!IsClose(a, 1.0) || !IsClose(num2, 1.0))
                    {
                        var animation11 = new DoubleAnimation
                        {
                            From = a,
                            To = num2,
                            Duration = duration,
                            EasingFunction = generatedEasingFunction
                        };
                        Storyboard.SetTarget(animation11, canvas2);
                        Storyboard.SetTargetProperty(animation11, new PropertyPath(UIElement.OpacityProperty));
                        storyboard.Children.Add(animation11);
                    }
                }
            }
            return storyboard;
        }

        private static Storyboard ExtractLayoutStoryboard(VisualState state)
        {
            Storyboard layoutStoryboard = null;
            if (state.Storyboard != null)
            {
                layoutStoryboard = GetLayoutStoryboard(state.Storyboard);
                if (layoutStoryboard == null)
                {
                    layoutStoryboard = new Storyboard();
                    for (var i = state.Storyboard.Children.Count - 1; i >= 0; i--)
                    {
                        var timeline = state.Storyboard.Children[i];
                        if (LayoutPropertyFromTimeline(timeline, false) != null)
                        {
                            state.Storyboard.Children.RemoveAt(i);
                            layoutStoryboard.Children.Add(timeline);
                        }
                    }
                    SetLayoutStoryboard(state.Storyboard, layoutStoryboard);
                }
            }
            if (layoutStoryboard == null)
                return new Storyboard();
            return layoutStoryboard;
        }

        private static List<FrameworkElement> FindTargetElements(FrameworkElement control,
            FrameworkElement templateRoot, Storyboard layoutStoryboard,
            List<OriginalLayoutValueRecord> originalValueRecords, List<FrameworkElement> movingElements)
        {
            var list = new List<FrameworkElement>();
            if (movingElements != null)
                list.AddRange(movingElements);
            foreach (var timeline in layoutStoryboard.Children)
            {
                var item = (FrameworkElement) GetTimelineTarget(control, templateRoot, timeline);
                if (item != null)
                {
                    if (!list.Contains(item))
                        list.Add(item);
                    if (ChildAffectingLayoutProperties.Contains(LayoutPropertyFromTimeline(timeline, false)))
                    {
                        if (item is Panel panel)
                            foreach (FrameworkElement element2 in panel.Children)
                                if (!list.Contains(element2) && !(element2 is WrapperCanvas))
                                    list.Add(element2);
                    }
                }
            }
            foreach (var record in originalValueRecords)
            {
                if (!list.Contains(record.Element))
                    list.Add(record.Element);
                if (ChildAffectingLayoutProperties.Contains(record.Property))
                {
                    if (record.Element is Panel element)
                        foreach (FrameworkElement element3 in element.Children)
                            if (!list.Contains(element3) && !(element3 is WrapperCanvas))
                                list.Add(element3);
                }
            }
            for (var i = 0; i < list.Count; i++)
            {
                var reference = list[i];
                var parent = VisualTreeHelper.GetParent(reference) as FrameworkElement;
                if (movingElements != null && movingElements.Contains(reference) && parent is WrapperCanvas)
                    parent = VisualTreeHelper.GetParent(parent) as FrameworkElement;
                if (parent != null)
                {
                    if (!list.Contains(parent))
                        list.Add(parent);
                    for (var j = 0; j < VisualTreeHelper.GetChildrenCount(parent); j++)
                    {
                        if (VisualTreeHelper.GetChild(parent, j) is FrameworkElement child && !list.Contains(child) && !(child is WrapperCanvas))
                            list.Add(child);
                    }
                }
            }
            return list;
        }

        private static VisualTransition FindTransition(VisualStateGroup group, VisualState previousState,
            VisualState state)
        {
            var str = previousState != null ? previousState.Name : string.Empty;
            var str2 = state != null ? state.Name : string.Empty;
            var num = -1;
            VisualTransition transition = null;
            foreach (VisualTransition transition2 in group.Transitions)
            {
                var num2 = 0;
                if (transition2.From == str)
                    num2++;
                else if (!string.IsNullOrEmpty(transition2.From))
                    continue;
                if (transition2.To == str2)
                    num2 += 2;
                else if (!string.IsNullOrEmpty(transition2.To))
                    continue;
                if (num2 > num)
                {
                    num = num2;
                    transition = transition2;
                }
            }
            return transition;
        }

        private static bool FinishesWithZeroOpacity(FrameworkElement control, FrameworkElement stateGroupsRoot,
            VisualState state, VisualState previousState)
        {
            if (state.Storyboard != null)
                foreach (var timeline in state.Storyboard.Children)
                    if (TimelineIsAnimatingRootOpacity(timeline, control, stateGroupsRoot))
                    {
                        var valueFromTimeline = GetValueFromTimeline(timeline, out var flag);
                        return flag && valueFromTimeline is double d && Math.Abs(d) < 0.001;
                    }
            if (previousState?.Storyboard == null)
                return Math.Abs(stateGroupsRoot.Opacity) < 0.001;
            foreach (var timeline2 in previousState.Storyboard.Children)
                TimelineIsAnimatingRootOpacity(timeline2, control, stateGroupsRoot);
            var animationBaseValue = (double) stateGroupsRoot.GetAnimationBaseValue(UIElement.OpacityProperty);
            return Math.Abs(animationBaseValue) < 0.001;
        }

        private static void FinishTransitionEffectAnimation(FrameworkElement stateGroupsRoot)
        {
            SetTransitionEffectStoryboard(stateGroupsRoot, null);
            TransferLocalValue(stateGroupsRoot, CachedEffectProperty, UIElement.EffectProperty);
            if (GetDidCacheBackground(stateGroupsRoot))
            {
                TransferLocalValue(stateGroupsRoot, CachedBackgroundProperty, Panel.BackgroundProperty);
                SetDidCacheBackground(stateGroupsRoot, false);
            }
        }

        internal static object GetCachedBackground(DependencyObject obj)
        {
            return obj.GetValue(CachedBackgroundProperty);
        }

        internal static Effect GetCachedEffect(DependencyObject obj)
        {
            return (Effect) obj.GetValue(CachedEffectProperty);
        }

        internal static VisualState GetCurrentState(DependencyObject obj)
        {
            return (VisualState) obj.GetValue(CurrentStateProperty);
        }

        internal static bool GetDidCacheBackground(DependencyObject obj)
        {
            return (bool) obj.GetValue(DidCacheBackgroundProperty);
        }

        internal static Rect GetLayoutRect(FrameworkElement element)
        {
            var actualWidth = element.ActualWidth;
            var actualHeight = element.ActualHeight;
            if (element is Image || element is MediaElement)
                if (element.Parent is Canvas)
                {
                    actualWidth = double.IsNaN(element.Width) ? actualWidth : element.Width;
                    actualHeight = double.IsNaN(element.Height) ? actualHeight : element.Height;
                }
                else
                {
                    actualWidth = element.RenderSize.Width;
                    actualHeight = element.RenderSize.Height;
                }
            actualWidth = element.Visibility == Visibility.Collapsed ? 0.0 : actualWidth;
            actualHeight = element.Visibility == Visibility.Collapsed ? 0.0 : actualHeight;
            var margin = element.Margin;
            var layoutSlot = LayoutInformation.GetLayoutSlot(element);
            var x = 0.0;
            var y = 0.0;
            switch (element.HorizontalAlignment)
            {
                case HorizontalAlignment.Left:
                    x = layoutSlot.Left + margin.Left;
                    break;

                case HorizontalAlignment.Center:
                    x = (layoutSlot.Left + margin.Left + layoutSlot.Right - margin.Right) / 2.0 - actualWidth / 2.0;
                    break;

                case HorizontalAlignment.Right:
                    x = layoutSlot.Right - margin.Right - actualWidth;
                    break;

                case HorizontalAlignment.Stretch:
                    x = Math.Max(layoutSlot.Left + margin.Left,
                        (layoutSlot.Left + margin.Left + layoutSlot.Right - margin.Right) / 2.0 - actualWidth / 2.0);
                    break;
            }
            switch (element.VerticalAlignment)
            {
                case VerticalAlignment.Top:
                    y = layoutSlot.Top + margin.Top;
                    break;

                case VerticalAlignment.Center:
                    y = (layoutSlot.Top + margin.Top + layoutSlot.Bottom - margin.Bottom) / 2.0 - actualHeight / 2.0;
                    break;

                case VerticalAlignment.Bottom:
                    y = layoutSlot.Bottom - margin.Bottom - actualHeight;
                    break;

                case VerticalAlignment.Stretch:
                    y = Math.Max(layoutSlot.Top + margin.Top,
                        (layoutSlot.Top + margin.Top + layoutSlot.Bottom - margin.Bottom) / 2.0 - actualHeight / 2.0);
                    break;
            }
            return new Rect(x, y, actualWidth, actualHeight);
        }

        internal static Storyboard GetLayoutStoryboard(DependencyObject obj)
        {
            return (Storyboard) obj.GetValue(LayoutStoryboardProperty);
        }

        private static Dictionary<FrameworkElement, double> GetOldOpacities(FrameworkElement control,
            FrameworkElement templateRoot, Storyboard layoutStoryboard,
            List<OriginalLayoutValueRecord> originalValueRecords, List<FrameworkElement> movingElements)
        {
            var dictionary = new Dictionary<FrameworkElement, double>();
            if (movingElements != null)
                foreach (var element in movingElements)
                {
                    if (element.Parent is WrapperCanvas parent)
                        dictionary.Add(element, parent.Opacity);
                }
            for (var i = originalValueRecords.Count - 1; i >= 0; i--)
            {
                var record = originalValueRecords[i];
                if (IsVisibilityProperty(record.Property) && !dictionary.TryGetValue(record.Element, out var num2))
                {
                    num2 = (Visibility) record.Element.GetValue(record.Property) == Visibility.Visible ? 1.0 : 0.0;
                    dictionary.Add(record.Element, num2);
                }
            }
            foreach (var timeline in layoutStoryboard.Children)
            {
                var key = (FrameworkElement) GetTimelineTarget(control, templateRoot, timeline);
                var property = LayoutPropertyFromTimeline(timeline, true);
                if (key != null && IsVisibilityProperty(property) && !dictionary.TryGetValue(key, out var num3))
                {
                    num3 = (Visibility) key.GetValue(property) == Visibility.Visible ? 1.0 : 0.0;
                    dictionary.Add(key, num3);
                }
            }
            return dictionary;
        }

        internal static List<OriginalLayoutValueRecord> GetOriginalLayoutValues(DependencyObject obj)
        {
            return (List<OriginalLayoutValueRecord>) obj.GetValue(OriginalLayoutValuesProperty);
        }

        private static Dictionary<FrameworkElement, Rect> GetRectsOfTargets(IEnumerable<FrameworkElement> targets,
            ICollection<FrameworkElement> movingElements)
        {
            var dictionary = new Dictionary<FrameworkElement, Rect>();
            foreach (var element in targets)
            {
                Rect layoutRect;
                if (movingElements != null && movingElements.Contains(element) && element.Parent is WrapperCanvas parent)
                {
                    layoutRect = GetLayoutRect(parent);
                    var renderTransform = parent.RenderTransform as TranslateTransform;
                    var left = Canvas.GetLeft(element);
                    var top = Canvas.GetTop(element);
                    layoutRect = new Rect(
                        layoutRect.Left + (double.IsNaN(left) ? 0.0 : left) +
                        (renderTransform?.X ?? 0.0),
                        layoutRect.Top + (double.IsNaN(top) ? 0.0 : top) +
                        (renderTransform?.Y ?? 0.0), element.ActualWidth, element.ActualHeight);
                }
                else
                {
                    layoutRect = GetLayoutRect(element);
                }
                dictionary.Add(element, layoutRect);
            }
            return dictionary;
        }

        public static DependencyProperty GetRuntimeVisibilityProperty(DependencyObject obj)
        {
            return (DependencyProperty) obj.GetValue(RuntimeVisibilityPropertyProperty);
        }

        private static object GetTimelineTarget(FrameworkElement control, FrameworkElement templateRoot,
            Timeline timeline)
        {
            var targetName = Storyboard.GetTargetName(timeline);
            if (string.IsNullOrEmpty(targetName))
                return null;
            if (control is UserControl)
                return control.FindName(targetName);
            return templateRoot.FindName(targetName);
        }

        public static TransitionEffect GetTransitionEffect(DependencyObject obj)
        {
            return (TransitionEffect) obj.GetValue(TransitionEffectProperty);
        }

        internal static Storyboard GetTransitionEffectStoryboard(DependencyObject obj)
        {
            return (Storyboard) obj.GetValue(TransitionEffectStoryboardProperty);
        }

        public static bool GetUseFluidLayout(DependencyObject obj)
        {
            return (bool) obj.GetValue(UseFluidLayoutProperty);
        }

        private static object GetValueFromTimeline(Timeline timeline, out bool gotValue)
        {
            if (timeline is ObjectAnimationUsingKeyFrames frames)
            {
                gotValue = true;
                return frames.KeyFrames[0].Value;
            }
            if (timeline is DoubleAnimationUsingKeyFrames frames2)
            {
                gotValue = true;
                return frames2.KeyFrames[0].Value;
            }
            if (timeline is DoubleAnimation animation)
            {
                gotValue = true;
                return animation.To;
            }
            if (timeline is ThicknessAnimationUsingKeyFrames frames3)
            {
                gotValue = true;
                return frames3.KeyFrames[0].Value;
            }
            if (timeline is ThicknessAnimation animation2)
            {
                gotValue = true;
                return animation2.To;
            }
            if (timeline is Int32AnimationUsingKeyFrames frames4)
            {
                gotValue = true;
                return frames4.KeyFrames[0].Value;
            }
            if (timeline is Int32Animation animation3)
            {
                gotValue = true;
                return animation3.To;
            }
            gotValue = false;
            return null;
        }

        protected override bool GoToStateCore(FrameworkElement control, FrameworkElement stateGroupsRoot,
            string stateName, VisualStateGroup group, VisualState state, bool useTransitions)
        {
            if (_changingState)
                return false;
            var currentState = GetCurrentState(group);
            if (!Equals(currentState, state))
            {
                var transition = FindTransition(group, currentState, state);
                var animateWithTransitionEffect =
                    PrepareTransitionEffectImage(stateGroupsRoot, useTransitions, transition);
                if (!GetUseFluidLayout(group))
                    return TransitionEffectAwareGoToStateCore(control, stateGroupsRoot, stateName, group, state,
                        useTransitions, transition, animateWithTransitionEffect, currentState);
                var layoutStoryboard = ExtractLayoutStoryboard(state);
                var originalLayoutValues = GetOriginalLayoutValues(group);
                if (originalLayoutValues == null)
                {
                    originalLayoutValues = new List<OriginalLayoutValueRecord>();
                    SetOriginalLayoutValues(group, originalLayoutValues);
                }
                if (!useTransitions)
                {
                    if (LayoutTransitionStoryboard != null)
                        StopAnimations();
                    var flag2 = TransitionEffectAwareGoToStateCore(control, stateGroupsRoot, stateName, group, state,
                        false, transition, animateWithTransitionEffect, currentState);
                    SetLayoutStoryboardProperties(control, stateGroupsRoot, layoutStoryboard, originalLayoutValues);
                    return flag2;
                }
                if (layoutStoryboard.Children.Count == 0 && originalLayoutValues.Count == 0)
                    return TransitionEffectAwareGoToStateCore(control, stateGroupsRoot, stateName, group, state,
                        true, transition, animateWithTransitionEffect, currentState);
                try
                {
                    _changingState = true;
                    stateGroupsRoot.UpdateLayout();
                    var targets = FindTargetElements(control, stateGroupsRoot, layoutStoryboard, originalLayoutValues,
                        MovingElements);
                    var rectsOfTargets = GetRectsOfTargets(targets, MovingElements);
                    var oldOpacities = GetOldOpacities(control, stateGroupsRoot, layoutStoryboard, originalLayoutValues,
                        MovingElements);
                    if (LayoutTransitionStoryboard != null)
                    {
                        stateGroupsRoot.LayoutUpdated -= control_LayoutUpdated;
                        StopAnimations();
                        stateGroupsRoot.UpdateLayout();
                    }
                    TransitionEffectAwareGoToStateCore(control, stateGroupsRoot, stateName, group, state,
                        true, transition, animateWithTransitionEffect, currentState);
                    SetLayoutStoryboardProperties(control, stateGroupsRoot, layoutStoryboard, originalLayoutValues);
                    stateGroupsRoot.UpdateLayout();
                    var newRects = GetRectsOfTargets(targets, null);
                    MovingElements = new List<FrameworkElement>();
                    foreach (var element in targets)
                        if (rectsOfTargets[element] != newRects[element])
                            MovingElements.Add(element);
                    foreach (var element2 in oldOpacities.Keys)
                        if (!MovingElements.Contains(element2))
                            MovingElements.Add(element2);
                    WrapMovingElementsInCanvases(MovingElements, rectsOfTargets, newRects);
                    stateGroupsRoot.LayoutUpdated += control_LayoutUpdated;
                    LayoutTransitionStoryboard =
                        CreateLayoutTransitionStoryboard(transition, MovingElements, oldOpacities);

                    void Handler(object sender, EventArgs e)
                    {
                        stateGroupsRoot.LayoutUpdated -= control_LayoutUpdated;
                        StopAnimations();
                    }

                    LayoutTransitionStoryboard.Completed += Handler;
                    LayoutTransitionStoryboard.Begin();
                }
                finally
                {
                    _changingState = false;
                }
            }
            return true;
        }

        private static bool IsClose(double a, double b)
        {
            return Math.Abs(a - b) < 1E-07;
        }

        private static bool IsVisibilityProperty(DependencyProperty property)
        {
            if (property != UIElement.VisibilityProperty)
                return property.Name == "RuntimeVisibility";
            return true;
        }

        private static DependencyProperty LayoutPropertyFromTimeline(Timeline timeline, bool forceRuntimeProperty)
        {
            var targetProperty = Storyboard.GetTargetProperty(timeline);
            if (targetProperty != null &&
                targetProperty.PathParameters.Count != 0)
            {
                if (targetProperty.PathParameters[0] is DependencyProperty item)
                {
                    if (item.Name == "RuntimeVisibility" &&
                        item.OwnerType.Name.EndsWith("DesignTimeProperties", StringComparison.Ordinal))
                    {
                        if (!LayoutProperties.Contains(item))
                            LayoutProperties.Add(item);
                        if (!forceRuntimeProperty)
                            return UIElement.VisibilityProperty;
                        return item;
                    }
                    if (item.Name == "RuntimeWidth" &&
                        item.OwnerType.Name.EndsWith("DesignTimeProperties", StringComparison.Ordinal))
                    {
                        if (!LayoutProperties.Contains(item))
                            LayoutProperties.Add(item);
                        if (!forceRuntimeProperty)
                            return FrameworkElement.WidthProperty;
                        return item;
                    }
                    if (item.Name == "RuntimeHeight" &&
                        item.OwnerType.Name.EndsWith("DesignTimeProperties", StringComparison.Ordinal))
                    {
                        if (!LayoutProperties.Contains(item))
                            LayoutProperties.Add(item);
                        if (!forceRuntimeProperty)
                            return FrameworkElement.HeightProperty;
                        return item;
                    }
                    if (LayoutProperties.Contains(item))
                        return item;
                }
            }
            return null;
        }

        private static bool PrepareTransitionEffectImage(FrameworkElement stateGroupsRoot, bool useTransitions,
            VisualTransition transition)
        {
            var effect = transition == null ? null : GetTransitionEffect(transition);
            var flag = false;
            if (effect != null)
            {
                effect = effect.CloneCurrentValue();
                if (useTransitions)
                {
                    flag = true;
                    var pixelWidth = (int) Math.Max(1.0, stateGroupsRoot.ActualWidth);
                    var pixelHeight = (int) Math.Max(1.0, stateGroupsRoot.ActualHeight);
                    var bitmap = new RenderTargetBitmap(pixelWidth, pixelHeight, 96.0, 96.0, PixelFormats.Pbgra32);
                    bitmap.Render(stateGroupsRoot);
                    var brush = new ImageBrush
                    {
                        ImageSource = bitmap
                    };
                    effect.OldImage = brush;
                }
                var transitionEffectStoryboard = GetTransitionEffectStoryboard(stateGroupsRoot);
                if (transitionEffectStoryboard != null)
                {
                    transitionEffectStoryboard.Stop();
                    FinishTransitionEffectAnimation(stateGroupsRoot);
                }
                if (useTransitions)
                {
                    TransferLocalValue(stateGroupsRoot, UIElement.EffectProperty, CachedEffectProperty);
                    stateGroupsRoot.Effect = effect;
                }
            }
            return flag;
        }

        private static void ReplaceCachedLocalValueHelper(FrameworkElement element, DependencyProperty property,
            object value)
        {
            if (value == DependencyProperty.UnsetValue)
            {
                element.ClearValue(property);
            }
            else
            {
                if (value is BindingExpressionBase base2)
                    element.SetBinding(property, base2.ParentBindingBase);
                else
                    element.SetValue(property, value);
            }
        }

        internal static void SetCachedBackground(DependencyObject obj, object value)
        {
            obj.SetValue(CachedBackgroundProperty, value);
        }

        internal static void SetCachedEffect(DependencyObject obj, Effect value)
        {
            obj.SetValue(CachedEffectProperty, value);
        }

        internal static void SetCurrentState(DependencyObject obj, VisualState value)
        {
            obj.SetValue(CurrentStateProperty, value);
        }

        internal static void SetDidCacheBackground(DependencyObject obj, bool value)
        {
            obj.SetValue(DidCacheBackgroundProperty, value);
        }

        internal static void SetLayoutStoryboard(DependencyObject obj, Storyboard value)
        {
            obj.SetValue(LayoutStoryboardProperty, value);
        }

        private static void SetLayoutStoryboardProperties(FrameworkElement control, FrameworkElement templateRoot,
            Storyboard layoutStoryboard, List<OriginalLayoutValueRecord> originalValueRecords)
        {
            foreach (var record in originalValueRecords)
                ReplaceCachedLocalValueHelper(record.Element, record.Property, record.Value);
            originalValueRecords.Clear();
            foreach (var timeline in layoutStoryboard.Children)
            {
                var dependencyObject = (FrameworkElement) GetTimelineTarget(control, templateRoot, timeline);
                var property = LayoutPropertyFromTimeline(timeline, true);
                if (dependencyObject != null && property != null)
                {
                    var valueFromTimeline = GetValueFromTimeline(timeline, out var flag);
                    if (flag)
                    {
                        var item = new OriginalLayoutValueRecord
                        {
                            Element = dependencyObject,
                            Property = property,
                            Value = CacheLocalValueHelper(dependencyObject, property)
                        };
                        originalValueRecords.Add(item);
                        dependencyObject.SetValue(property, valueFromTimeline);
                    }
                }
            }
        }

        internal static void SetOriginalLayoutValues(DependencyObject obj, List<OriginalLayoutValueRecord> value)
        {
            obj.SetValue(OriginalLayoutValuesProperty, value);
        }

        public static void SetRuntimeVisibilityProperty(DependencyObject obj, DependencyProperty value)
        {
            obj.SetValue(RuntimeVisibilityPropertyProperty, value);
        }

        public static void SetTransitionEffect(DependencyObject obj, TransitionEffect value)
        {
            obj.SetValue(TransitionEffectProperty, value);
        }

        internal static void SetTransitionEffectStoryboard(DependencyObject obj, Storyboard value)
        {
            obj.SetValue(TransitionEffectStoryboardProperty, value);
        }

        public static void SetUseFluidLayout(DependencyObject obj, bool value)
        {
            obj.SetValue(UseFluidLayoutProperty, value);
        }

        private static void StopAnimations()
        {
            if (LayoutTransitionStoryboard != null)
            {
                LayoutTransitionStoryboard.Stop();
                LayoutTransitionStoryboard = null;
            }
            if (MovingElements != null)
            {
                UnwrapMovingElementsFromCanvases(MovingElements);
                MovingElements = null;
            }
        }

        private static bool TimelineIsAnimatingRootOpacity(Timeline timeline, FrameworkElement control,
            FrameworkElement stateGroupsRoot)
        {
            if (!Equals(GetTimelineTarget(control, stateGroupsRoot, timeline), stateGroupsRoot))
                return false;
            var targetProperty = Storyboard.GetTargetProperty(timeline);
            return targetProperty != null &&
                   targetProperty.PathParameters.Count != 0 &&
                   targetProperty.PathParameters[0] == UIElement.OpacityProperty;
        }

        private static void TransferLocalValue(FrameworkElement element, DependencyProperty sourceProperty,
            DependencyProperty destProperty)
        {
            var obj2 = CacheLocalValueHelper(element, sourceProperty);
            ReplaceCachedLocalValueHelper(element, destProperty, obj2);
        }

        private bool TransitionEffectAwareGoToStateCore(FrameworkElement control, FrameworkElement stateGroupsRoot,
            string stateName, VisualStateGroup group, VisualState state, bool useTransitions,
            VisualTransition transition, bool animateWithTransitionEffect, VisualState previousState)
        {
            IEasingFunction generatedEasingFunction = null;
            if (animateWithTransitionEffect)
            {
                generatedEasingFunction = transition.GeneratedEasingFunction;
                var function2 = new DummyEasingFunction
                {
                    DummyValue = FinishesWithZeroOpacity(control, stateGroupsRoot, state, previousState) ? 0.01 : 0.0
                };
                transition.GeneratedEasingFunction = function2;
            }
            var flag = base.GoToStateCore(control, stateGroupsRoot, stateName, group, state, useTransitions);
            if (animateWithTransitionEffect)
            {
                transition.GeneratedEasingFunction = generatedEasingFunction;
                if (flag)
                    AnimateTransitionEffect(stateGroupsRoot, transition);
            }
            SetCurrentState(group, state);
            return flag;
        }

        private static void UnwrapMovingElementsFromCanvases(List<FrameworkElement> movingElements)
        {
            foreach (var element in movingElements)
            {
                if (element.Parent is WrapperCanvas parent)
                {
                    var obj2 = CacheLocalValueHelper(element, FrameworkElement.DataContextProperty);
                    element.DataContext = element.DataContext;
                    var element2 = VisualTreeHelper.GetParent(parent) as FrameworkElement;
                    parent.Children.Remove(element);
                    if (element2 is Panel panel)
                    {
                        var index = panel.Children.IndexOf(parent);
                        panel.Children.RemoveAt(index);
                        panel.Children.Insert(index, element);
                    }
                    else
                    {
                        if (element2 is Decorator decorator)
                            decorator.Child = element;
                    }
                    CopyLayoutProperties(parent, element, true);
                    ReplaceCachedLocalValueHelper(element, FrameworkElement.DataContextProperty, obj2);
                }
            }
        }

        private static void WrapMovingElementsInCanvases(List<FrameworkElement> movingElements,
            Dictionary<FrameworkElement, Rect> oldRects, Dictionary<FrameworkElement, Rect> newRects)
        {
            foreach (var element in movingElements)
            {
                var parent = VisualTreeHelper.GetParent(element) as FrameworkElement;
                var canvas = new WrapperCanvas
                {
                    OldRect = oldRects[element],
                    NewRect = newRects[element]
                };
                var obj2 = CacheLocalValueHelper(element, FrameworkElement.DataContextProperty);
                element.DataContext = element.DataContext;
                var flag = true;
                if (parent is Panel panel && !panel.IsItemsHost)
                {
                    var index = panel.Children.IndexOf(element);
                    panel.Children.RemoveAt(index);
                    panel.Children.Insert(index, canvas);
                }
                else
                {
                    if (parent is Decorator decorator)
                        decorator.Child = canvas;
                    else
                        flag = false;
                }
                if (flag)
                {
                    canvas.Children.Add(element);
                    CopyLayoutProperties(element, canvas, false);
                    ReplaceCachedLocalValueHelper(element, FrameworkElement.DataContextProperty, obj2);
                }
            }
        }

        // Nested Types
        private class DummyEasingFunction : EasingFunctionBase
        {
            // Fields
            public static readonly DependencyProperty DummyValueProperty = DependencyProperty.Register("DummyValue",
                typeof(double), typeof(DummyEasingFunction), new PropertyMetadata(0.0));

            // Properties
            public double DummyValue
            {
                private get => (double) GetValue(DummyValueProperty);
                set => SetValue(DummyValueProperty, value);
            }

            // Methods
            protected override Freezable CreateInstanceCore()
            {
                return new DummyEasingFunction();
            }

            protected override double EaseInCore(double normalizedTime)
            {
                return DummyValue;
            }
        }

        internal class OriginalLayoutValueRecord
        {
            // Properties
            public FrameworkElement Element { get; set; }

            public DependencyProperty Property { get; set; }

            public object Value { get; set; }
        }

        internal class WrapperCanvas : Canvas
        {
            // Fields
            internal static readonly DependencyProperty SimulationProgressProperty =
                DependencyProperty.Register("SimulationProgress", typeof(double), typeof(WrapperCanvas),
                    new PropertyMetadata(0.0, SimulationProgressChanged));

            // Properties
            public Visibility DestinationVisibilityCache { get; set; }

            public Dictionary<DependencyProperty, object> LocalValueCache { get; set; }

            public Rect NewRect { get; set; }

            public Rect OldRect { get; set; }

            public double SimulationProgress
            {
                get =>
                    (double) GetValue(SimulationProgressProperty);
                set => SetValue(SimulationProgressProperty, value);
            }

            // Methods
            private static void SimulationProgressChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
            {
                var canvas = d as WrapperCanvas;
                var newValue = (double) e.NewValue;
                if (canvas != null && canvas.Children.Count > 0)
                {
                    if (canvas.Children[0] is FrameworkElement element)
                    {
                        element.Width = Math.Max(0.0,
                            canvas.OldRect.Width * newValue + canvas.NewRect.Width * (1.0 - newValue));
                        element.Height = Math.Max(0.0,
                            canvas.OldRect.Height * newValue + canvas.NewRect.Height * (1.0 - newValue));
                        SetLeft(element, newValue * (canvas.OldRect.Left - canvas.NewRect.Left));
                        SetTop(element, newValue * (canvas.OldRect.Top - canvas.NewRect.Top));
                    }
                }
            }
        }
    }
}