Add project files.
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Daniel Clark
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Windows;
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using System.Windows.Controls;
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using System.Windows.Media;
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using System.Windows.Media.Animation;
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using System.Windows.Media.Imaging;
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namespace TheXamlGuy.UI.WPF.Controls;
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public class TransitioningContentControl : ContentControl
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{
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public static readonly DependencyProperty TransitionDirectionProperty =
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DependencyProperty.RegisterAttached(nameof(TransitioningContentControlTransitionDirection),
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typeof(TransitioningContentControlTransitionDirection), typeof(TransitioningContentControl), new PropertyMetadata(TransitioningContentControlTransitionDirection.Left));
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public static readonly DependencyProperty TransitionDurationProperty =
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DependencyProperty.RegisterAttached(nameof(Duration),
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typeof(TimeSpan), typeof(TransitioningContentControl), new PropertyMetadata(TimeSpan.FromSeconds(0.3)));
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public static readonly DependencyProperty TransitionProperty =
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DependencyProperty.RegisterAttached(nameof(Transition),
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typeof(TransitioningContentControlTransitionType), typeof(TransitioningContentControl), new PropertyMetadata(TransitioningContentControlTransitionType.Fade));
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private Storyboard? completingTransition;
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private Grid? container;
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private ContentPresenter? currentContentPresentationSite;
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private bool isTransitioning;
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private VisualStateGroup? presentationGroup;
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private Image? previousImageSite;
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private Storyboard? startingTransition;
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public TransitioningContentControl()
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{
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DefaultStyleKey = typeof(TransitioningContentControl);
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}
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public event RoutedEventHandler? TransitionCompleted;
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public event RoutedEventHandler? TransitionStarted;
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public TransitioningContentControlTransitionDirection Direction
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{
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get => (TransitioningContentControlTransitionDirection)GetValue(TransitionDirectionProperty);
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set => SetValue(TransitionDirectionProperty, value);
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}
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public TimeSpan Duration
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{
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get => (TimeSpan)GetValue(TransitionDurationProperty);
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set => SetValue(TransitionDurationProperty, value);
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}
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public TransitioningContentControlTransitionType Transition
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{
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get => (TransitioningContentControlTransitionType)GetValue(TransitionProperty);
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set => SetValue(TransitionProperty, value);
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}
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private Storyboard? CompletingTransition
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{
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get => completingTransition;
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set
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{
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if (completingTransition is not null)
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{
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CompletingTransition!.Completed -= OnTransitionCompleted;
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}
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completingTransition = value;
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if (completingTransition is not null)
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{
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CompletingTransition!.Completed += OnTransitionCompleted;
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SetTransitionDefaultValues();
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}
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}
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}
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private Storyboard? StartingTransition
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{
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get => startingTransition;
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set
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{
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startingTransition = value;
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if (startingTransition is not null)
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{
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SetTransitionDefaultValues();
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}
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}
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}
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public override void OnApplyTemplate()
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{
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container = GetTemplateChild("Container") as Grid;
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if (container is not null)
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{
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presentationGroup = ((IEnumerable<VisualStateGroup>)VisualStateManager.GetVisualStateGroups(container))!.FirstOrDefault(x => x.Name == "PresentationStates");
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}
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currentContentPresentationSite = GetTemplateChild("CurrentContentPresentationSite") as ContentPresenter;
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previousImageSite = GetTemplateChild("PreviousImageSite") as Image;
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if (currentContentPresentationSite is not null)
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{
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currentContentPresentationSite.Content = Content;
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}
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VisualStateManager.GoToState(this, "Normal", false);
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}
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protected override void OnContentChanged(object oldContent, object newContent)
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{
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QueueTransition(newContent);
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base.OnContentChanged(oldContent, newContent);
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}
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private static RenderTargetBitmap GetRenderTargetBitmapFromUiElement(UIElement uiElement)
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{
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if (uiElement.RenderSize.Height == 0 || uiElement.RenderSize.Width == 0)
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{
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return default!;
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}
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DpiScale dpiScale = VisualTreeHelper.GetDpi(uiElement);
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double pixelWidth = Math.Max(1.0, uiElement.RenderSize.Width * dpiScale.DpiScaleX);
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double pixelHeight = Math.Max(1.0, uiElement.RenderSize.Height * dpiScale.DpiScaleY);
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RenderTargetBitmap renderTargetBitmap = new(Convert.ToInt32(pixelWidth), Convert.ToInt32(pixelHeight), dpiScale.PixelsPerInchX, dpiScale.PixelsPerInchY, PixelFormats.Pbgra32);
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renderTargetBitmap.Render(uiElement);
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renderTargetBitmap.Freeze();
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return renderTargetBitmap;
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}
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private void AbortTransition()
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{
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VisualStateManager.GoToState(this, "Normal", false);
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isTransitioning = false;
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if (previousImageSite is not null)
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{
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if (previousImageSite.Source is RenderTargetBitmap renderTargetBitmap)
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{
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renderTargetBitmap.Clear();
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}
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previousImageSite.Source = null;
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previousImageSite.UpdateLayout();
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}
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}
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private Storyboard GetTransitionStoryboardByName(string transitionName)
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{
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if (presentationGroup is not null)
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{
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if (((IEnumerable<VisualState>)presentationGroup.States).Where(x => x.Name == transitionName).Select(x => x.Storyboard).FirstOrDefault() is Storyboard transition)
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{
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return transition;
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}
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}
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return new Storyboard();
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}
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private void OnTransitionCompleted(object? sender, EventArgs args)
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{
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AbortTransition();
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TransitionCompleted?.Invoke(this, new RoutedEventArgs());
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}
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private void QueueTransition(object newContent)
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{
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if (currentContentPresentationSite is null)
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{
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return;
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}
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if (isTransitioning || previousImageSite is null)
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{
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currentContentPresentationSite.Content = newContent;
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return;
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}
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previousImageSite.Source = GetRenderTargetBitmapFromUiElement(currentContentPresentationSite);
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currentContentPresentationSite.Content = newContent;
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string transitionInName = string.Empty;
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int statesRemaining = 0;
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string startingTransitionName = string.Empty;
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if (Transition == TransitioningContentControlTransitionType.Bounce)
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{
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transitionInName = $"{Transition}{Direction}In";
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CompletingTransition = GetTransitionStoryboardByName(transitionInName);
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startingTransitionName = $"{Transition}{Direction}Out";
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StartingTransition = (Storyboard?)GetTransitionStoryboardByName(startingTransitionName);
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statesRemaining = 2;
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StartingTransition!.Completed += NextState;
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}
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else
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{
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if (StartingTransition is not null)
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{
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StartingTransition!.Completed -= NextState;
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}
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StartingTransition = null;
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startingTransitionName = Transition == TransitioningContentControlTransitionType.Fade ? "Fade" : $"{Transition}{Direction}";
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CompletingTransition = GetTransitionStoryboardByName(startingTransitionName);
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statesRemaining = 1;
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}
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isTransitioning = true;
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RaiseTransitionStarted();
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statesRemaining--;
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VisualStateManager.GoToState(this, startingTransitionName, false);
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void NextState(object? sender, EventArgs args)
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{
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StartingTransition!.Completed -= NextState;
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if (statesRemaining == 1)
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{
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statesRemaining--;
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VisualStateManager.GoToState(this, transitionInName, false);
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}
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}
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}
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private void RaiseTransitionStarted()
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{
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TransitionStarted?.Invoke(this, new RoutedEventArgs());
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}
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private void SetTransitionDefaultValues()
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{
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switch (Transition)
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{
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case TransitioningContentControlTransitionType.Fade:
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{
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if (CompletingTransition is null)
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{
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return;
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}
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DoubleAnimation completingDoubleAnimation = (DoubleAnimation)CompletingTransition.Children[0];
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completingDoubleAnimation.Duration = Duration;
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DoubleAnimation startingDoubleAnimation = (DoubleAnimation)CompletingTransition.Children[1];
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startingDoubleAnimation.Duration = Duration;
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break;
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}
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case TransitioningContentControlTransitionType.Slide:
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{
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if (CompletingTransition is null)
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{
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return;
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}
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DoubleAnimation startingDoubleAnimation = (DoubleAnimation)CompletingTransition.Children[0];
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startingDoubleAnimation.Duration = Duration;
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startingDoubleAnimation.From = Direction switch
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{
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TransitioningContentControlTransitionDirection.Down => -ActualHeight,
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TransitioningContentControlTransitionDirection.Up => ActualHeight,
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TransitioningContentControlTransitionDirection.Right => -ActualWidth,
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TransitioningContentControlTransitionDirection.Left => ActualWidth,
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_ => throw new ArgumentOutOfRangeException(nameof(TransitioningContentControlTransitionDirection))
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};
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break;
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}
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case TransitioningContentControlTransitionType.Move:
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{
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if (CompletingTransition is null)
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{
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return;
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}
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DoubleAnimation completingDoubleAnimation = (DoubleAnimation)CompletingTransition.Children[0];
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DoubleAnimation startingDoubleAnimation = (DoubleAnimation)CompletingTransition.Children[1];
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startingDoubleAnimation.Duration = Duration;
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completingDoubleAnimation.Duration = Duration;
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switch (Direction)
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{
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case TransitioningContentControlTransitionDirection.Down:
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startingDoubleAnimation.To = ActualHeight;
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completingDoubleAnimation.From = -ActualHeight;
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break;
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case TransitioningContentControlTransitionDirection.Up:
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startingDoubleAnimation.To = -ActualHeight;
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completingDoubleAnimation.From = ActualHeight;
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break;
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case TransitioningContentControlTransitionDirection.Right:
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startingDoubleAnimation.To = ActualWidth;
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completingDoubleAnimation.From = -ActualWidth;
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break;
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case TransitioningContentControlTransitionDirection.Left:
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startingDoubleAnimation.To = -ActualWidth;
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completingDoubleAnimation.From = ActualWidth;
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break;
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default: throw new ArgumentOutOfRangeException(nameof(TransitioningContentControlTransitionDirection));
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}
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break;
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}
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case TransitioningContentControlTransitionType.Bounce:
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{
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if (CompletingTransition is not null)
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{
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DoubleAnimationUsingKeyFrames completingDoubleAnimation = (DoubleAnimationUsingKeyFrames)CompletingTransition.Children[0];
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completingDoubleAnimation.KeyFrames[1].Value = ActualHeight;
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}
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if (StartingTransition is null)
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{
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return;
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}
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DoubleAnimation startingDoubleAnimation = (DoubleAnimation)StartingTransition.Children[0];
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startingDoubleAnimation.To = Direction switch
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{
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TransitioningContentControlTransitionDirection.Down => ActualHeight,
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TransitioningContentControlTransitionDirection.Up => -ActualHeight,
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TransitioningContentControlTransitionDirection.Right => ActualWidth,
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TransitioningContentControlTransitionDirection.Left => -ActualWidth,
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_ => throw new ArgumentOutOfRangeException(nameof(TransitioningContentControlTransitionDirection))
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};
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break;
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}
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case TransitioningContentControlTransitionType.Drop: break;
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default: throw new ArgumentOutOfRangeException(nameof(TransitioningContentControlTransitionDirection));
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}
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}
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}
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