/// <summary>
/// Registers observers for property changes on the specified Brush.
/// Note that skia implementation of this method should only be used for property observervation.
/// </summary>
internal static IDisposable AssignAndObserveBrush(Brush brush, Action <Color> colorSetter, Action imageBrushCallback = null)
{
if (brush == null)
{
colorSetter(SolidColorBrushHelper.Transparent.Color);
return(null);
}
var disposables = new CompositeDisposable();
if (brush is SolidColorBrush colorBrush)
{
brush.RegisterDisposablePropertyChangedCallback(
SolidColorBrush.ColorProperty,
(s, colorArg) => colorSetter(SolidColorBrushHelper.Transparent.Color)
)
.DisposeWith(disposables);
brush.RegisterDisposablePropertyChangedCallback(
SolidColorBrush.OpacityProperty,
(s, colorArg) => colorSetter(SolidColorBrushHelper.Transparent.Color)
)
.DisposeWith(disposables);
}
else if (brush is GradientBrush gradientBrush)
{
if (gradientBrush is LinearGradientBrush linearGradient)
{
gradientBrush.RegisterDisposablePropertyChangedCallback(
LinearGradientBrush.StartPointProperty,
(s, e) => colorSetter(SolidColorBrushHelper.Transparent.Color)
)
.DisposeWith(disposables);
gradientBrush.RegisterDisposablePropertyChangedCallback(
LinearGradientBrush.EndPointProperty,
(s, e) => colorSetter(SolidColorBrushHelper.Transparent.Color)
)
.DisposeWith(disposables);
}
gradientBrush.RegisterDisposablePropertyChangedCallback(
GradientBrush.GradientStopsProperty,
(s, e) => colorSetter(SolidColorBrushHelper.Transparent.Color)
)
.DisposeWith(disposables);
gradientBrush.RegisterDisposablePropertyChangedCallback(
GradientBrush.MappingModeProperty,
(s, e) => colorSetter(SolidColorBrushHelper.Transparent.Color)
)
.DisposeWith(disposables);
gradientBrush.RegisterDisposablePropertyChangedCallback(
GradientBrush.OpacityProperty,
(s, e) => colorSetter(SolidColorBrushHelper.Transparent.Color)
)
.DisposeWith(disposables);
gradientBrush.RegisterDisposablePropertyChangedCallback(
GradientBrush.SpreadMethodProperty,
(s, e) => colorSetter(SolidColorBrushHelper.Transparent.Color)
)
.DisposeWith(disposables);
gradientBrush.RegisterDisposablePropertyChangedCallback(
GradientBrush.RelativeTransformProperty,
(s, e) => colorSetter(SolidColorBrushHelper.Transparent.Color)
)
.DisposeWith(disposables);
}
//else if (b is ImageBrush imageBrush)
//{
//}
else if (brush is AcrylicBrush acrylicBrush)
{
acrylicBrush.RegisterDisposablePropertyChangedCallback(
AcrylicBrush.FallbackColorProperty,
(s, e) => colorSetter(SolidColorBrushHelper.Transparent.Color)
)
.DisposeWith(disposables);
acrylicBrush.RegisterDisposablePropertyChangedCallback(
AcrylicBrush.OpacityProperty,
(s, e) => colorSetter(SolidColorBrushHelper.Transparent.Color)
)
.DisposeWith(disposables);
}
colorSetter(SolidColorBrushHelper.Transparent.Color);
return(disposables);
}
