/// <summary>
/// Called when current freezed copy of the <see cref="GradientBrush"/> is changed.
/// </summary>
/// <param name="oldValue">
/// The original <see cref="GradientBrush"/> value.
/// </param>
protected override void OnAnimationBrushChanged(GradientBrush oldValue)
{
brush = null;
if (AnimationBrush == null ||
AnimationBrush.GradientStops == null ||
AnimationBrush.GradientStops.Count == 0)
{
return;
}
brush = AnimationBrush.Clone();
}
/// <summary>
/// Get the current <see cref="GradientBrush"/> value for the specified progress between 0 to 1 inclusive.
/// </summary>
/// <param name="defaultOriginalBrush">
/// The default <see cref="GradientBrush"/> instance.
/// </param>
/// <param name="defaultDestinationBrush">
/// The default <see cref="GradientBrush"/> instance.
/// </param>
/// <param name="progress">
/// The current progress between 0 to 1 inclusive.
/// </param>
/// <returns>
/// The current <see cref="GradientBrush"/> value for the specified progress between 0 to 1 inclusive.
/// </returns>
protected override GradientBrush GetCurrentValue(
GradientBrush defaultOriginalBrush,
GradientBrush defaultDestinationBrush,
double progress)
{
if (AnimationBrush == null)
{
return(defaultOriginalBrush);
}
//
// Either no gradient stop defined or the current value is right at
// the start.
//
if (progress.IsCloseTo(MinimumValue) ||
distance.IsCloseTo(MinimumValue))
{
return(AnimationBrush);
}
GradientBrush brush = AnimationBrush.Clone();
brush.GradientStops.Clear();
double startOffset = StartOffset;
double offset = distance * progress;
foreach (GradientStop gradientStop in AnimationBrush.GradientStops)
{
double stepOffset = gradientStop.Offset + offset - startOffset;
if (stepOffset.IsLessThan(0))
{
continue;
}
// Stop shifting gradient stops further beyond maximum
if (stepOffset.IsCloseTo(MaximumValue))
{
break;
}
GradientStop step = new GradientStop(gradientStop.Color, gradientStop.Offset + offset);
brush.GradientStops.Add(step);
}
brush.Freeze();
return(brush);
}
/// <summary>
/// Called when current freezed copy of the <see cref="GradientBrush"/> is changed.
/// </summary>
/// <param name="oldValue">
/// The original <see cref="GradientBrush"/> value.
/// </param>
protected override void OnAnimationBrushChanged(GradientBrush oldValue)
{
stops = null;
brush = null;
total = 0;
if (AnimationBrush == null ||
AnimationBrush.GradientStops == null ||
AnimationBrush.GradientStops.Count == 0)
{
return;
}
List <GradientStop> list = new List <GradientStop>();
foreach (GradientStop stop in
AnimationBrush.GradientStops.OrderBy(value => value.Offset))
{
if (!list.Exists(
value => value.Offset.IsCloseTo(stop.Offset)))
{
list.Add(stop);
}
}
if (list.Count < 2)
{
return;
}
for (int i = 1; i < list.Count; i++)
{
total += list[i].Offset - list[i - 1].Offset;
}
stops = new ReadOnlyCollection <GradientStop>(list);
brush = AnimationBrush.Clone();
brush.GradientStops.Clear();
brush.GradientStops.Add(new GradientStop(stops.First().Color, 0));
brush.GradientStops.Add(new GradientStop(stops.Last().Color, 1));
}