public static void SetBorder(this AView view, Context context, VisualElement element, Color color, double width)
{
var borderWidth = (int)context.ToPixels(width);
switch (view.Background)
{
case GradientDrawable gradientDrawable:
gradientDrawable.SetStroke(borderWidth, ColorStateList.ValueOf(color.ToAndroid()));
break;
case GradientStrokeDrawable gradientStrokeDrawable:
gradientStrokeDrawable.SetStroke(borderWidth, color);
break;
case PaintDrawable paintDrawable:
var paint = paintDrawable.Paint;
paint.AntiAlias = true;
paint.Color = color.ToAndroid();
paint.StrokeWidth = borderWidth;
paint.SetStyle(Paint.Style.Stroke);
if (element is IGradientElement gradientElement)
{
view.SetPaintGradient(gradientElement.Gradients, gradientElement.Angle);
}
break;
default:
view.Background?.Dispose();
var newGradientDrawable = new GradientDrawable();
newGradientDrawable.SetStroke(borderWidth, ColorStateList.ValueOf(color.ToAndroid()));
newGradientDrawable.SetColor(element.BackgroundColor.ToAndroid());
view.Background = newGradientDrawable;
break;
}
}
public static void SetGradient(this AView view, XGradientType type, IList <GradientStop> gradients, float angle)
{
if (!gradients.Any())
{
return;
}
var colors = gradients.Select(x => (int)x.Color.ToAndroid()).ToArray();
var positions = gradients.Select(x => x.Offset).ToArray();
/* If positions are set, then go for PaintDrawable */
if (!positions.All(x => Math.Abs(x) < Math.Pow(10, -10)))
{
view.SetPaintGradient(gradients, angle);
return;
}
var constructNew = true;
GradientDrawable gradientDrawable;
/* Reuse existing one */
if (view.Background is GradientDrawable oldGradientDrawable)
{
constructNew = false;
gradientDrawable = oldGradientDrawable;
}
else
{
gradientDrawable = new GradientDrawable();
}
gradientDrawable.SetColors(colors);
gradientDrawable.SetOrientation(angle);
switch (type)
{
case XGradientType.Radial:
gradientDrawable.SetGradientType(AGradientType.RadialGradient);
gradientDrawable.SetGradientRadius(view.Context.Resources.DisplayMetrics.WidthPixels);
break;
default:
gradientDrawable.SetShape(ShapeType.Rectangle);
gradientDrawable.SetGradientType(AGradientType.LinearGradient);
break;
}
if (!constructNew)
{
return;
}
view.Background?.Dispose();
view.Background = gradientDrawable;
}
