private static CompositionGradientBrush CreateCompositionGradientBrush(GradientBrush gradientBrush, Compositor compositor)
{
CompositionGradientBrush compositionBrush;
if (gradientBrush is LinearGradientBrush linearGradient)
{
CompositionLinearGradientBrush compositionLinearGradientBrush = compositor.CreateLinearGradientBrush();
compositionLinearGradientBrush.StartPoint = linearGradient.StartPoint.ToVector2();
compositionLinearGradientBrush.EndPoint = linearGradient.EndPoint.ToVector2();
compositionBrush = compositionLinearGradientBrush;
}
else
{
return(null);
}
compositionBrush.RelativeTransformMatrix = gradientBrush.RelativeTransform?.MatrixCore ?? Matrix3x2.Identity;
compositionBrush.ExtendMode = ConvertGradientExtendMode(gradientBrush.SpreadMethod);
compositionBrush.MappingMode = ConvertBrushMappingMode(gradientBrush.MappingMode);
ConvertGradientColorStops(compositor, compositionBrush, gradientBrush.GradientStops, gradientBrush.Opacity);
return(compositionBrush);
}
private static IDisposable AssignAndObserveGradientBrush(GradientBrush gradientBrush, Compositor compositor, BrushSetterHandler brushSetter)
{
var disposables = new CompositeDisposable();
var compositionBrush = CreateCompositionGradientBrush(gradientBrush, compositor);
if (gradientBrush is LinearGradientBrush linearGradient)
{
var clgb = (CompositionLinearGradientBrush)compositionBrush;
gradientBrush.RegisterDisposablePropertyChangedCallback(
LinearGradientBrush.StartPointProperty,
(s, e) => clgb.StartPoint = (Vector2)e.NewValue
)
.DisposeWith(disposables);
gradientBrush.RegisterDisposablePropertyChangedCallback(
LinearGradientBrush.EndPointProperty,
(s, e) => clgb.EndPoint = (Vector2)e.NewValue
)
.DisposeWith(disposables);
}
gradientBrush.RegisterDisposablePropertyChangedCallback(
GradientBrush.GradientStopsProperty,
(s, e) => ConvertGradientColorStops(
compositionBrush.Compositor,
compositionBrush,
(GradientStopCollection)e.NewValue,
((GradientBrush)s).Opacity)
)
.DisposeWith(disposables);
gradientBrush.RegisterDisposablePropertyChangedCallback(
GradientBrush.MappingModeProperty,
(s, e) => compositionBrush.MappingMode = (CompositionMappingMode)e.NewValue
)
.DisposeWith(disposables);
gradientBrush.RegisterDisposablePropertyChangedCallback(
GradientBrush.OpacityProperty,
(s, e) => ConvertGradientColorStops(
compositionBrush.Compositor,
compositionBrush,
((GradientBrush)s).GradientStops,
(double)e.NewValue)
)
.DisposeWith(disposables);
gradientBrush.RegisterDisposablePropertyChangedCallback(
GradientBrush.SpreadMethodProperty,
(s, e) => compositionBrush.ExtendMode = ConvertGradientExtendMode((GradientSpreadMethod)e.NewValue)
)
.DisposeWith(disposables);
gradientBrush.RegisterDisposablePropertyChangedCallback(
GradientBrush.RelativeTransformProperty,
(s, e) => compositionBrush.RelativeTransformMatrix = ((Transform)e.NewValue)?.MatrixCore ?? Matrix3x2.Identity
)
.DisposeWith(disposables);
brushSetter(compositionBrush);
return(disposables);
}