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147 lines
5.3 KiB
C#
147 lines
5.3 KiB
C#
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using Microsoft.Expression.Media.Effects;
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using System.ComponentModel;
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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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namespace MediaBrowser.UI.Controls
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{
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/// <summary>
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/// http://victorcher.blogspot.com/2012/02/wpf-transactions.html
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/// </summary>
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public class TransitionControl : ContentControl
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{
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/// <summary>
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/// The _content presenter
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/// </summary>
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private ContentPresenter _contentPresenter;
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/// <summary>
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/// Initializes static members of the <see cref="TransitionControl" /> class.
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/// </summary>
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static TransitionControl()
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{
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DefaultStyleKeyProperty.OverrideMetadata(
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typeof(TransitionControl), new FrameworkPropertyMetadata(typeof(TransitionControl)));
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ContentProperty.OverrideMetadata(
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typeof(TransitionControl), new FrameworkPropertyMetadata(OnContentPropertyChanged));
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}
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/// <summary>
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/// When overridden in a derived class, is invoked whenever application code or internal processes call <see cref="M:System.Windows.FrameworkElement.ApplyTemplate" />.
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/// </summary>
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public override void OnApplyTemplate()
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{
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base.OnApplyTemplate();
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_contentPresenter = (ContentPresenter)Template.FindName("ContentPresenter", this);
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}
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#region DP TransitionType
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/// <summary>
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/// Gets or sets the type of the transition.
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/// </summary>
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/// <value>The type of the transition.</value>
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public TransitionEffect TransitionType
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{
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get { return (TransitionEffect)GetValue(TransitionTypeProperty); }
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set { SetValue(TransitionTypeProperty, value); }
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}
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// Using a DependencyProperty as the backing store for TransitionType. This enables animation, styling, binding, etc...
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/// <summary>
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/// The transition type property
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/// </summary>
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public static readonly DependencyProperty TransitionTypeProperty =
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DependencyProperty.Register("TransitionType", typeof(TransitionEffect), typeof(TransitionControl),
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new UIPropertyMetadata(new BlindsTransitionEffect()));
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#endregion DP TransitionType
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#region DP Transition Animation
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/// <summary>
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/// Gets or sets the transition animation.
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/// </summary>
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/// <value>The transition animation.</value>
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public DoubleAnimation TransitionAnimation
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{
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get { return (DoubleAnimation)GetValue(TransitionAnimationProperty); }
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set { SetValue(TransitionAnimationProperty, value); }
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}
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// Using a DependencyProperty as the backing store for TransitionAnimation. This enables animation, styling, binding, etc...
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/// <summary>
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/// The transition animation property
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/// </summary>
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public static readonly DependencyProperty TransitionAnimationProperty =
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DependencyProperty.Register("TransitionAnimation", typeof(DoubleAnimation), typeof(TransitionControl), new UIPropertyMetadata(null));
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#endregion DP Transition Animation
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/// <summary>
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/// Called when [content property changed].
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/// </summary>
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/// <param name="dp">The dp.</param>
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/// <param name="args">The <see cref="DependencyPropertyChangedEventArgs" /> instance containing the event data.</param>
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private static void OnContentPropertyChanged(DependencyObject dp, DependencyPropertyChangedEventArgs args)
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{
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var oldContent = args.OldValue;
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var newContent = args.NewValue;
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var transitionControl = (TransitionControl)dp;
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if (DesignerProperties.GetIsInDesignMode(transitionControl))
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return;
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if (oldContent != null && newContent != null && transitionControl.IsVisible)
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{
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transitionControl.AnimateContent(oldContent, newContent);
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}
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else if (newContent != null)
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{
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transitionControl.Content = newContent;
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}
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}
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/// <summary>
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/// Animates the content.
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/// </summary>
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/// <param name="oldContent">The old content.</param>
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/// <param name="newContent">The new content.</param>
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private void AnimateContent(object oldContent, object newContent)
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{
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FrameworkElement oldContentVisual;
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try
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{
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oldContentVisual = VisualTreeHelper.GetChild(_contentPresenter, 0) as FrameworkElement;
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}
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catch
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{
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return;
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}
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var transitionEffect = TransitionType;
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if (transitionEffect == null)
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{
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_contentPresenter.Content = newContent;
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return;
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}
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var da = TransitionAnimation;
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da.From = 0;
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da.To = 1;
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da.FillBehavior = FillBehavior.HoldEnd;
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transitionEffect.OldImage = new VisualBrush(oldContentVisual);
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transitionEffect.BeginAnimation(TransitionEffect.ProgressProperty, da);
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_contentPresenter.Effect = transitionEffect;
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_contentPresenter.Content = newContent;
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}
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}
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}
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