PageTransitions are used to render a transition between two views, for example in a or
The duration must be set before the transition is used and must be greater than 0. If not, you will get an error.
Build-In PageTransitions
CrossFade
The CrossFade fades out the current view and fades in the new view by animating the opacity.
<CrossFade Duration="0:00:00.500" />
var transition = new CrossFade(TimeSpan.FromMilliseconds(500));
Source code
Reference
PageSlide
The PageSlide slides the content either horizontally or vertically. You can specify the slide axis via the Orientation-property. The default value is Horizontal.
var transition = new PageSlide(TimeSpan.FromMilliseconds(500), PageSlide.SlideAxis.Vertical);
Source code
Reference
CompositePageTransition
The CompositePageTransition is used create a combined transition of several different transitions. The below sample creates a transition which slides the views diagonal (horizontally and vertically at the same time) and also fades the views out and in.
var compositeTransition = new CompositePageTransition();
compositeTransition.PageTransitions.Add(new PageSlide(TimeSpan.FromMilliseconds(500), PageSlide.SlideAxis.Vertical));
compositeTransition.PageTransitions.Add(new PageSlide(TimeSpan.FromMilliseconds(500), PageSlide.SlideAxis.Horizontal));
compositeTransition.PageTransitions.Add(new CrossFade(TimeSpan.FromMilliseconds(500)));
Source code
Reference
Custom PageTransitions
You can also create your own PageTransition by implementing the IPageTransition-interface.
The Interface has one member which you need to implement:
public Task Start(Visual? from, Visual? to, bool forward, CancellationToken cancellationToken)
{
// Setup the transition here.
}
Example
Below is a sample which will shrink the old view and grow the new view in vertically direction.
public class CustomTransition : IPageTransition
{
/// <summary>
/// Initializes a new instance of the <see cref="CustomTransition"/> class.
/// </summary>
public CustomTransition()
{
}
/// <summary>
/// Initializes a new instance of the <see cref="CustomTransition"/> class.
/// </summary>
/// <param name="duration">The duration of the animation.</param>
public CustomTransition(TimeSpan duration)
{
Duration = duration;
}
/// <summary>
/// Gets the duration of the animation.
/// </summary>
public TimeSpan Duration { get; set; }
public async Task Start(Visual from, Visual to, bool forward, CancellationToken cancellationToken)
{
if (cancellationToken.IsCancellationRequested)
{
return;
}
var tasks = new List<Task>();
var parent = GetVisualParent(from, to);
var scaleYProperty = ScaleTransform.ScaleYProperty;
if (from != null)
{
var animation = new Animation
{
FillMode = FillMode.Forward,
Children =
{
new KeyFrame
{
Setters = { new Setter { Property = scaleYProperty, Value = 1d } },
Cue = new Cue(0d)
},
new KeyFrame
{
Setters =
{
new Setter
{
Property = scaleYProperty,
Value = 0d
}
},
Cue = new Cue(1d)
}
},
Duration = Duration
};
tasks.Add(animation.RunAsync(from, null, cancellationToken));
}
if (to != null)
{
to.IsVisible = true;
var animation = new Animation
{
FillMode = FillMode.Forward,
Children =
{
new KeyFrame
{
Setters =
{
new Setter
{
Property = scaleYProperty,
Value = 0d
}
},
Cue = new Cue(0d)
},
new KeyFrame
{
Setters = { new Setter { Property = scaleYProperty, Value = 1d } },
Cue = new Cue(1d)
}
},
Duration = Duration
};
tasks.Add(animation.RunAsync(to, null, cancellationToken));
}
await Task.WhenAll(tasks);
if (from != null && !cancellationToken.IsCancellationRequested)
{
from.IsVisible = false;
}
}
/// <summary>
/// Gets the common visual parent of the two control.
/// </summary>
/// <param name="from">The from control.</param>
/// <param name="to">The to control.</param>
/// <returns>The common parent.</returns>
/// <exception cref="ArgumentException">
/// The two controls do not share a common parent.
/// </exception>
/// <remarks>
/// Any one of the parameters may be null, but not both.
/// </remarks>
private static IVisual GetVisualParent(IVisual? from, IVisual? to)
{
var p1 = (from ?? to)!.VisualParent;
var p2 = (to ?? from)!.VisualParent;
if (p1 != null && p2 != null && p1 != p2)
{
throw new ArgumentException("Controls for PageSlide must have same parent.");
}
return p1 ?? throw new InvalidOperationException("Cannot determine visual parent.");
}
}
