private static float[] GetRadii(RoundedCornerStackLayout control)
{
var radius = (float)(control.CornerRadius);
if (radius == -1)
{
radius = (float)control.Width / 8;
}
else
{
radius *= 2;
}
var topLeft = control.RoundedCorners.ToLower().Contains("topleft") ? radius : 0;
var topRight = control.RoundedCorners.ToLower().Contains("topright") ? radius : 0;
var bottomLeft = control.RoundedCorners.ToLower().Contains("bottomleft") ? radius : 0;
var bottomRight = control.RoundedCorners.ToLower().Contains("bottomright") ? radius : 0;
if (control.RoundedCorners.ToLower().Contains("all"))
{
topLeft = topRight = bottomLeft = bottomRight = radius;
}
var radii = new[] { topLeft, topLeft, topRight, topRight, bottomRight, bottomRight, bottomLeft, bottomLeft };
return(radii);
}
private static void DrawBorder(Canvas canvas, RoundedCornerStackLayout control, Path path)
{
if (control.BorderColor == Xamarin.Forms.Color.Transparent ||
control.BorderThickness <= 0)
{
return;
}
var paint = new Paint();
paint.AntiAlias = true;
paint.StrokeWidth = control.BorderThickness;
paint.SetStyle(Paint.Style.Stroke);
paint.Color = control.BorderColor.ToAndroid();
canvas.DrawPath(path, paint);
paint.Dispose();
}
public static Drawable GenerateBackgroundWithShadow(RoundedCornerStackLayout control, Android.Views.View child, Android.Graphics.Color backgroundColor,
Android.Graphics.Color shadowColor,
int elevation,
GravityFlags shadowGravity)
{
var radii = GetRadii(control);
int DY;
switch (shadowGravity)
{
case GravityFlags.Center:
DY = 0;
break;
case GravityFlags.Top:
DY = -1 * elevation / 3;
break;
default:
case GravityFlags.Bottom:
DY = elevation / 3;
break;
}
var shapeDrawable = new ShapeDrawable();
shapeDrawable.Paint.Color = backgroundColor;
shapeDrawable.Paint.SetShadowLayer(elevation, 0, DY, shadowColor);
child.SetLayerType(LayerType.Software, shapeDrawable.Paint);
shapeDrawable.Shape = new RoundRectShape(radii, null, null);
var drawable = new LayerDrawable(new Drawable[] { shapeDrawable });
drawable.SetLayerInset(0, elevation, elevation, elevation, elevation);
child.Background = drawable;
return(drawable);
}