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using System;
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using System.ComponentModel;
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using System.Diagnostics.CodeAnalysis;
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using System.Linq;
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using System.Windows;
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using System.Windows;
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using System.Windows.Controls;
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using System.Windows.Markup;
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using System.Windows.Media;
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using System.Windows.Media.Animation;
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using HandyControl.Data;
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using HandyControl.Tools;
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namespace HandyControl.Controls
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{
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[TemplateVisualState(GroupName = PresentationGroup, Name = NormalState)]
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[TemplateVisualState(GroupName = PresentationGroup, Name = DefaultTransitionState)]
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[TemplatePart(Name = PreviousContentPresentationSitePartName, Type = typeof(ContentControl))]
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[TemplatePart(Name = CurrentContentPresentationSitePartName, Type = typeof(ContentControl))]
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[ContentProperty("Content")]
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public class TransitioningContentControl : Control
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public class TransitioningContentControl : ContentControl
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{
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private Storyboard _currentTransition;
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private FrameworkElement _contentPresenter;
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public TransitioningContentControl()
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{
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if (!DesignerProperties.GetIsInDesignMode(this))
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{
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DefaultStyleKey = typeof(TransitioningContentControl);
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}
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Loaded += TransitioningContentControl_Loaded;
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IsVisibleChanged += TransitioningContentControl_IsVisibleChanged;
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}
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private Storyboard CurrentTransition
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public static readonly DependencyProperty TransitionModeProperty = DependencyProperty.Register(
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"TransitionMode", typeof(TransitionMode), typeof(TransitioningContentControl), new PropertyMetadata(default(TransitionMode), OnTransitionModeChanged));
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private static void OnTransitionModeChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
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{
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set
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{
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if (_currentTransition != null)
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_currentTransition.Completed -= OnTransitionCompleted;
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_currentTransition = value;
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if (_currentTransition != null)
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_currentTransition.Completed += OnTransitionCompleted;
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}
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var ctl = (TransitioningContentControl) d;
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ctl.StartTransition();
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}
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#region Events
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public TransitionMode TransitionMode
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{
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get => (TransitionMode) GetValue(TransitionModeProperty);
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set => SetValue(TransitionModeProperty, value);
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}
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public event RoutedEventHandler TransitionCompleted;
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public static readonly DependencyProperty TransitionStoryboardProperty = DependencyProperty.Register(
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"TransitionStoryboard", typeof(Storyboard), typeof(TransitioningContentControl), new PropertyMetadata(default(Storyboard)));
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#endregion Events
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public Storyboard TransitionStoryboard
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{
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get => (Storyboard) GetValue(TransitionStoryboardProperty);
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set => SetValue(TransitionStoryboardProperty, value);
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}
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private void TransitioningContentControl_IsVisibleChanged(object sender, DependencyPropertyChangedEventArgs e) => StartTransition();
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private void TransitioningContentControl_Loaded(object sender, RoutedEventArgs e) => StartTransition();
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private void StartTransition()
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{
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if (Visibility != Visibility.Visible || _contentPresenter == null) return;
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(TransitionStoryboard ?? ResourceHelper.GetResource<Storyboard>($"{TransitionMode.ToString()}Transition"))?.Begin(_contentPresenter);
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}
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public override void OnApplyTemplate()
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{
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if (DesignerProperties.GetIsInDesignMode(this)) return;
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if (IsTransitioning)
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AbortTransition();
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base.OnApplyTemplate();
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PreviousContentPresentationSite =
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GetTemplateChild(PreviousContentPresentationSitePartName) as ContentPresenter;
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CurrentContentPresentationSite =
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GetTemplateChild(CurrentContentPresentationSitePartName) as ContentPresenter;
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if (CurrentContentPresentationSite != null)
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CurrentContentPresentationSite.Content = Content;
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var transition = GetStoryboard(Transition);
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CurrentTransition = transition;
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if (transition == null)
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_contentPresenter = VisualTreeHelper.GetChild(this, 0) as FrameworkElement;
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if (_contentPresenter != null)
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{
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Transition = DefaultTransitionState;
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throw new ArgumentException("TransitioningContentControl_TransitionNotFound");
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}
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VisualStateManager.GoToState(this, NormalState, false);
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VisualStateManager.GoToState(this, Transition, true);
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}
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public static readonly DependencyProperty ContentProperty = DependencyProperty.Register(
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"Content", typeof(object), typeof(TransitioningContentControl), new PropertyMetadata(default(object), OnContentChanged));
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private static void OnContentChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
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{
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var ctl = (TransitioningContentControl) d;
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ctl.StartTransition(e.OldValue, e.NewValue);
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}
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public static readonly DependencyProperty ContentTemplateProperty = DependencyProperty.Register(
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"ContentTemplate", typeof(DataTemplate), typeof(TransitioningContentControl), new PropertyMetadata(default(DataTemplate)));
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public DataTemplate ContentTemplate
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{
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get => (DataTemplate) GetValue(ContentTemplateProperty);
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set => SetValue(ContentTemplateProperty, value);
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}
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public object Content
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{
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get => GetValue(ContentProperty);
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set => SetValue(ContentProperty, value);
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}
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[SuppressMessage("Microsoft.Usage", "CA1801:ReviewUnusedParameters", MessageId = "newContent", Justification = "Should be used in the future.")]
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private void StartTransition(object oldContent, object newContent)
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{
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if (CurrentContentPresentationSite != null && PreviousContentPresentationSite != null)
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{
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CurrentContentPresentationSite.Content = newContent;
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PreviousContentPresentationSite.Content = oldContent;
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if (!IsTransitioning || RestartTransitionOnContentChange)
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_contentPresenter.RenderTransformOrigin = new Point(0.5, 0.5);
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_contentPresenter.RenderTransform = new TransformGroup
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{
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IsTransitioning = true;
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VisualStateManager.GoToState(this, NormalState, false);
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VisualStateManager.GoToState(this, Transition, true);
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}
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Children =
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{
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new ScaleTransform(),
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new SkewTransform(),
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new RotateTransform(),
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new TranslateTransform()
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}
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};
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}
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}
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private void OnTransitionCompleted(object sender, EventArgs e)
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{
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AbortTransition();
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var handler = TransitionCompleted;
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handler?.Invoke(this, new RoutedEventArgs());
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}
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public void AbortTransition()
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{
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VisualStateManager.GoToState(this, NormalState, false);
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IsTransitioning = false;
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if (PreviousContentPresentationSite != null)
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PreviousContentPresentationSite.Content = null;
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}
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private Storyboard GetStoryboard(string newTransition)
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{
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var presentationGroup = VisualHelper.TryGetVisualStateGroup(this, PresentationGroup);
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Storyboard newStoryboard = null;
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if (presentationGroup != null)
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newStoryboard = presentationGroup.States
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.OfType<VisualState>()
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.Where(state => state.Name == newTransition)
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.Select(state => state.Storyboard)
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.FirstOrDefault();
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return newStoryboard;
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}
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#region Visual state names
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private const string PresentationGroup = "PresentationStates";
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private const string NormalState = "Normal";
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public const string DefaultTransitionState = "DefaultTransition";
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#endregion Visual state names
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#region Template part names
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internal const string PreviousContentPresentationSitePartName = "PreviousContentPresentationSite";
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internal const string CurrentContentPresentationSitePartName = "CurrentContentPresentationSite";
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#endregion Template part names
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#region TemplateParts
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private ContentPresenter CurrentContentPresentationSite { get; set; }
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private ContentPresenter PreviousContentPresentationSite { get; set; }
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#endregion TemplateParts
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#region public bool IsTransitioning
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private bool _allowIsTransitioningWrite;
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public bool IsTransitioning
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{
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get => (bool)GetValue(IsTransitioningProperty);
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private set
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{
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_allowIsTransitioningWrite = true;
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SetValue(IsTransitioningProperty, value);
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_allowIsTransitioningWrite = false;
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}
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}
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public static readonly DependencyProperty IsTransitioningProperty =
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DependencyProperty.Register(
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"IsTransitioning",
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typeof(bool),
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typeof(TransitioningContentControl),
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new PropertyMetadata(OnIsTransitioningPropertyChanged));
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private static void OnIsTransitioningPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
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{
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var source = (TransitioningContentControl)d;
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if (!source._allowIsTransitioningWrite)
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{
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source.IsTransitioning = (bool)e.OldValue;
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throw new InvalidOperationException("TransitiotioningContentControl_IsTransitioningReadOnly");
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}
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}
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#endregion public bool IsTransitioning
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#region public string Transition
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public string Transition
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{
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get => GetValue(TransitionProperty) as string;
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set => SetValue(TransitionProperty, value);
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}
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public static readonly DependencyProperty TransitionProperty =
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DependencyProperty.Register(
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"Transition",
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typeof(string),
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typeof(TransitioningContentControl),
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new PropertyMetadata(DefaultTransitionState, OnTransitionPropertyChanged));
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private static void OnTransitionPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
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{
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var source = (TransitioningContentControl)d;
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var oldTransition = e.OldValue as string;
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var newTransition = e.NewValue as string;
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if (source.IsTransitioning)
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source.AbortTransition();
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var newStoryboard = source.GetStoryboard(newTransition);
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if (newStoryboard == null)
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if (VisualHelper.TryGetVisualStateGroup(source, PresentationGroup) == null)
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{
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source.CurrentTransition = null;
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}
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else
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{
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source.SetValue(TransitionProperty, oldTransition);
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throw new ArgumentException(
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"TransitioningContentControl_TransitionNotFound");
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}
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else
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source.CurrentTransition = newStoryboard;
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}
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#endregion public string Transition
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#region public bool RestartTransitionOnContentChange
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public bool RestartTransitionOnContentChange
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{
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get => (bool)GetValue(RestartTransitionOnContentChangeProperty);
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set => SetValue(RestartTransitionOnContentChangeProperty, value);
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}
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public static readonly DependencyProperty RestartTransitionOnContentChangeProperty =
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DependencyProperty.Register(
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"RestartTransitionOnContentChange",
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typeof(bool),
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typeof(TransitioningContentControl),
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new PropertyMetadata(ValueBoxes.FalseBox, OnRestartTransitionOnContentChangePropertyChanged));
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private static void OnRestartTransitionOnContentChangePropertyChanged(DependencyObject d,
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DependencyPropertyChangedEventArgs e)
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{
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((TransitioningContentControl)d).OnRestartTransitionOnContentChangeChanged((bool)e.OldValue,
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(bool)e.NewValue);
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}
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protected virtual void OnRestartTransitionOnContentChangeChanged(bool oldValue, bool newValue)
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{
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}
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#endregion public bool RestartTransitionOnContentChange
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}
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}
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