public void Reset()
{
if (_drawableEnabled)
{
_drawableEnabled = false;
_drawable?.Reset();
_drawable = null;
}
}
public void UpdateDrawable()
{
if (Element == null)
{
return;
}
bool cornerRadiusIsDefault = Element.CornerRadius == (CornerRadius)PancakeView.CornerRadiusProperty.DefaultValue;
bool backgroundColorIsDefault = !Element.BackgroundGradientStops.Any() && Element.BackgroundColor == (Color)VisualElement.BackgroundColorProperty.DefaultValue;
if (backgroundColorIsDefault && cornerRadiusIsDefault)
{
if (!_drawableEnabled)
{
return;
}
if (_defaultDrawable != null)
{
this.SetBackground(_defaultDrawable);
}
_drawableEnabled = false;
Reset();
}
else
{
if (_drawable == null)
{
_drawable = new PancakeDrawable(Element, Context.ToPixels);
}
if (_drawableEnabled)
{
return;
}
if (_defaultDrawable == null)
{
_defaultDrawable = this.Background;
}
if (!backgroundColorIsDefault)
{
this.SetBackground(_drawable);
}
_drawableEnabled = true;
}
this.Invalidate();
}
protected override void Dispose(bool disposing)
{
if (!_disposed)
{
if (disposing)
{
_drawable?.Dispose();
_drawable = null;
_defaultDrawable?.Dispose();
_defaultDrawable = null;
}
_disposed = true;
}
}
protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
{
var pancake = Element as PancakeView;
Validate(pancake);
base.OnElementPropertyChanged(sender, e);
if (e.PropertyName == PancakeView.BorderColorProperty.PropertyName ||
e.PropertyName == PancakeView.BorderThicknessProperty.PropertyName ||
e.PropertyName == PancakeView.BorderIsDashedProperty.PropertyName ||
e.PropertyName == PancakeView.BorderDashPatternProperty.PropertyName ||
e.PropertyName == PancakeView.BorderDrawingStyleProperty.PropertyName ||
e.PropertyName == PancakeView.BorderGradientAngleProperty.PropertyName ||
e.PropertyName == PancakeView.BorderGradientEndColorProperty.PropertyName ||
e.PropertyName == PancakeView.BorderGradientStartColorProperty.PropertyName ||
e.PropertyName == PancakeView.BorderGradientStopsProperty.PropertyName)
{
Invalidate();
}
else if (e.PropertyName == PancakeView.SidesProperty.PropertyName ||
e.PropertyName == PancakeView.OffsetAngleProperty.PropertyName ||
e.PropertyName == PancakeView.ShadowProperty.PropertyName ||
e.PropertyName == PancakeView.HasShadowProperty.PropertyName ||
e.PropertyName == PancakeView.ElevationProperty.PropertyName)
{
SetupShadow(pancake);
}
else if (e.PropertyName == PancakeView.CornerRadiusProperty.PropertyName)
{
Invalidate();
SetupShadow(pancake);
}
else if (e.PropertyName == VisualElement.BackgroundColorProperty.PropertyName)
{
_drawable.Dispose();
this.SetBackground(_drawable = new PancakeDrawable(pancake, Context.ToPixels));
}
}
protected override void OnElementChanged(ElementChangedEventArgs <ContentView> e)
{
base.OnElementChanged(e);
if (e.NewElement != null && e.OldElement == null)
{
var pancake = (Element as PancakeView);
// HACK: When there are no children we add a Grid element to trigger DrawChild.
// This should be improved upon, but I haven't found out a nice way to be able to clip
// the children and add the border on top without using DrawChild.
if (pancake.Content == null)
{
pancake.Content = new Grid();
}
Validate(pancake);
this.SetBackground(_drawable = new PancakeDrawable(pancake, Context.ToPixels));
SetupShadow(pancake);
}
}
