/// <summary>
/// Starts the animation.
/// </summary>
/// <param name="from">
/// The control that is being transitioned away from. May be null.
/// </param>
/// <param name="to">
/// The control that is being transitioned to. May be null.
/// </param>
/// <returns>
/// A <see cref="Task"/> that tracks the progress of the animation.
/// </returns>
public async Task Start(IVisual from, IVisual to)
{
var tasks = new List <Task>();
if (to != null)
{
to.Opacity = 0;
}
if (from != null)
{
tasks.Add(Animate.Property(
(IAvaloniaObject)from,
Visual.OpacityProperty,
from.Opacity,
0,
LinearEasing.For <double>(),
Duration).ToTask());
}
if (to != null)
{
to.Opacity = 0;
to.IsVisible = true;
tasks.Add(Animate.Property(
(IAvaloniaObject)to,
Visual.OpacityProperty,
0,
1,
LinearEasing.For <double>(),
Duration).ToTask());
}
await Task.WhenAll(tasks.ToArray());
if (from != null)
{
from.IsVisible = false;
from.Opacity = 1;
}
if (to != null)
{
to.Opacity = 1;
}
}
/// <summary>
/// Starts the animation.
/// </summary>
/// <param name="from">
/// The control that is being transitioned away from. May be null.
/// </param>
/// <param name="to">
/// The control that is being transitioned to. May be null.
/// </param>
/// <param name="forward">
/// If true, the new page is slid in from the right, or if false from the left.
/// </param>
/// <returns>
/// A <see cref="Task"/> that tracks the progress of the animation.
/// </returns>
public async Task Start(IVisual from, IVisual to, bool forward)
{
var tasks = new List <Task>();
var parent = GetVisualParent(from, to);
var distance = Orientation == SlideAxis.Horizontal ? parent.Bounds.Width : parent.Bounds.Height;
var translateProperty = Orientation == SlideAxis.Horizontal ? TranslateTransform.XProperty : TranslateTransform.YProperty;
if (from != null)
{
var transform = new TranslateTransform();
from.RenderTransform = transform;
tasks.Add(Animate.Property(
transform,
translateProperty,
0.0,
forward ? -distance : distance,
LinearEasing.For <double>(),
Duration).ToTask());
}
if (to != null)
{
var transform = new TranslateTransform();
to.RenderTransform = transform;
to.IsVisible = true;
tasks.Add(Animate.Property(
transform,
translateProperty,
forward ? distance : -distance,
0.0,
LinearEasing.For <double>(),
Duration).ToTask());
}
await Task.WhenAll(tasks.ToArray());
if (from != null)
{
from.IsVisible = false;
}
}
/// <summary>
/// Returns a new <see cref="PropertyTransition"/> for the specified
/// <see cref="AvaloniaProperty"/> using linear easing.
/// </summary>
/// <typeparam name="T">The type of the <see cref="AvaloniaProperty"/>.</typeparam>
/// <param name="property">The property to animate.</param>
/// <param name="duration">The animation duration.</param>
/// <returns>
/// A <see cref="PropertyTransition"/> that can be added to the
/// <see cref="Animatable.PropertyTransitions"/> collection.
/// </returns>
public static PropertyTransition Transition <T>(this AvaloniaProperty <T> property, TimeSpan duration)
{
return(new PropertyTransition(property, duration, LinearEasing.For <T>()));
}
