public override void Draw(CGRect rect)
{
base.Draw(rect);
GradientColorStackLayout stack = (GradientColorStackLayout)this.Element;
CGColor startColor = stack.StartColor.ToCGColor();
CGColor endColor = stack.EndColor.ToCGColor();
var gradientLayer = new CAGradientLayer();
gradientLayer.Frame = rect;
gradientLayer.Colors = new CGColor[] { startColor, endColor };
NativeView.Layer.InsertSublayer(gradientLayer, 0);
}
protected override void OnElementChanged(ElementChangedEventArgs <StackLayout> e)
{
base.OnElementChanged(e);
if (e.OldElement != null || Element == null)
{
return;
}
try
{
_stack = e.NewElement as GradientColorStackLayout;
}
catch (Exception ex)
{
System.Diagnostics.Debug.WriteLine(@"ERROR:", ex.Message);
}
}
public override void Draw(CGRect rect)
{
base.Draw(rect);
GradientColorStackLayout stack = this.Element as GradientColorStackLayout;
CGColor startColor = stack.StartColor.ToCGColor();
CGColor centerColor = stack.CenterColor.ToCGColor();
CGColor endColor = stack.EndColor.ToCGColor();
float yCenter = stack.YCenter;
ItemsLayoutOrientation direction = stack.Direction;
bool hasCenterColor = stack.HasCenterColor;
CAGradientLayer gradientLayer = null;
if (direction == ItemsLayoutOrientation.Vertical)
{
gradientLayer = new CAGradientLayer();
}
if (direction == ItemsLayoutOrientation.Horizontal)
{
gradientLayer = new CAGradientLayer()
{
StartPoint = new CGPoint(0, 0.5),
EndPoint = new CGPoint(1, 0.5)
};
}
gradientLayer.Frame = rect;
if (hasCenterColor)
{
gradientLayer.Locations = new NSNumber[] { new NSNumber(0.5F), new NSNumber(yCenter), new NSNumber(1F) };
gradientLayer.Colors = new CGColor[] { startColor, centerColor, endColor };
}
else
{
gradientLayer.Locations = new NSNumber[] { new NSNumber(yCenter), new NSNumber(1F) };
gradientLayer.Colors = new CGColor[] { startColor, endColor };
}
NativeView.Layer.InsertSublayer(gradientLayer, 0);
}