protected virtual void Dispose(bool disposing)
{
if (!_disposed)
{
if (disposing)
{
_backgroundDrawable?.Dispose();
_backgroundDrawable = null;
_defaultDrawable?.Dispose();
_defaultDrawable = null;
_rippleDrawable?.Dispose();
_rippleDrawable = null;
if (BorderElement != null)
{
BorderElement.PropertyChanged -= BorderElementPropertyChanged;
BorderElement = null;
}
if (_renderer != null)
{
_renderer.ElementChanged -= OnElementChanged;
_renderer = null;
}
}
_disposed = true;
}
}
public void Reset()
{
if (_drawableEnabled)
{
_drawableEnabled = false;
_backgroundDrawable?.Reset();
_backgroundDrawable = null;
_rippleDrawable = null;
}
}
public void UpdateDrawable()
{
if (BorderElement == null || Control == null)
{
return;
}
bool cornerRadiusIsDefault = !BorderElement.IsSet(BorderElement.CornerRadiusProperty) || (BorderElement.CornerRadius == (int)BorderElement.CornerRadiusProperty.DefaultValue || BorderElement.CornerRadius == BorderDrawable.DefaultCornerRadius);
bool backgroundColorIsDefault = !BorderElement.IsSet(VisualElement.BackgroundColorProperty) || BorderElement.BackgroundColor == (Color)VisualElement.BackgroundColorProperty.DefaultValue;
bool borderColorIsDefault = !BorderElement.IsSet(BorderElement.BorderColorProperty) || BorderElement.BorderColor == (Color)BorderElement.BorderColorProperty.DefaultValue;
bool borderWidthIsDefault = !BorderElement.IsSet(BorderElement.BorderWidthProperty) || BorderElement.BorderWidth == (double)BorderElement.BorderWidthProperty.DefaultValue;
if (backgroundColorIsDefault &&
cornerRadiusIsDefault &&
borderColorIsDefault &&
borderWidthIsDefault)
{
if (!_drawableEnabled)
{
return;
}
if (_defaultDrawable != null)
{
Control.SetBackground(_defaultDrawable);
}
_drawableEnabled = false;
Reset();
}
else
{
if (_backgroundDrawable == null)
{
_backgroundDrawable = new BorderDrawable(Control.Context.ToPixels, Forms.GetColorButtonNormal(Control.Context), _drawOutlineWithBackground);
}
_backgroundDrawable.BorderController = BorderElement;
var useDefaultPadding = _renderer.UseDefaultPadding();
int paddingTop = useDefaultPadding ? Control.PaddingTop : 0;
int paddingLeft = useDefaultPadding ? Control.PaddingLeft : 0;
var useDefaultShadow = _renderer.UseDefaultShadow();
// Use no shadow by default for API < 16
float shadowRadius = 0;
float shadowDy = 0;
float shadowDx = 0;
AColor shadowColor = Color.Transparent.ToAndroid();
// Add Android's default material shadow if we want it
if (useDefaultShadow)
{
shadowRadius = 2;
shadowDy = 4;
shadowDx = 0;
shadowColor = _backgroundDrawable.PressedBackgroundColor.ToAndroid();
}
// Otherwise get values from the control (but only for supported APIs)
else if ((int)Build.VERSION.SdkInt >= 16)
{
shadowRadius = _renderer.ShadowRadius;
shadowDy = _renderer.ShadowDy;
shadowDx = _renderer.ShadowDx;
shadowColor = _renderer.ShadowColor;
}
_backgroundDrawable.SetPadding(paddingTop, paddingLeft);
if (_renderer.IsShadowEnabled())
{
_backgroundDrawable
.SetShadow(shadowDy, shadowDx, shadowColor, shadowRadius);
}
if (_drawableEnabled)
{
return;
}
if (_defaultDrawable == null)
{
_defaultDrawable = Control.Background;
}
if (!backgroundColorIsDefault || _drawOutlineWithBackground)
{
if (Forms.IsLollipopOrNewer)
{
var rippleColor = _backgroundDrawable.PressedBackgroundColor.ToAndroid();
_rippleDrawable = new RippleDrawable(ColorStateList.ValueOf(rippleColor), _backgroundDrawable, null);
Control.SetBackground(_rippleDrawable);
}
else
{
Control.SetBackground(_backgroundDrawable);
}
}
_drawableEnabled = true;
}
Control.Invalidate();
}