protected override bool OnExposeEvent(Gdk.EventExpose evnt)
{
using (var context = Gdk.CairoHelper.Create(evnt.Window)) {
if (pickerCircle == null || pickerCircle.Width != Radius * 2 + 100 || pickerCircle.Height != Radius * 2 + 100)
{
pickerCircle = new Cairo.ImageSurface(Cairo.Format.ARGB32, Radius * 2 + 100, Radius * 2 + 100);
using (var g = new Cairo.Context(pickerCircle)) {
// apparently quartz needs the surface initialized
g.Color = new Color(0, 0, 0);
g.Paint();
}
DrawPickerCircle(pickerCircle, Radius);
}
Gdk.Point center = PickerCenter();
context.Arc(center.X, center.Y, Radius, 0, Math.PI * 2);
context.Clip();
pickerCircle.Show(context, center.X - pickerCircle.Width / 2, center.Y - pickerCircle.Height / 2);
context.ResetClip();
context.Arc(center.X, center.Y, Radius + 5, 0, Math.PI * 2);
context.LineWidth = 10;
using (var lg = new Cairo.LinearGradient(0, center.Y - (Radius + 30), 0, center.Y + (Radius + 30))) {
lg.AddColorStop(0, new Color(0, 0, 0, 0.3));
lg.AddColorStop(1, new Color(0, 0, 0, 0.1));
context.Pattern = lg;
context.Stroke();
}
context.Arc(center.X, center.Y, Radius + 15, 0, Math.PI * 2);
context.LineWidth = 10;
using (var lg = new Cairo.LinearGradient(0, center.Y - (Radius + 30), 0, center.Y + (Radius + 30))) {
lg.AddColorStop(0, new Color(0, 0, 0, 0.1));
lg.AddColorStop(1, new Color(0, 0, 0, 0.3));
context.Pattern = lg;
context.Stroke();
}
if (HighlightColor.HasValue)
{
DrawColorOverlay(context, center, HighlightColor.Value);
}
Gdk.Rectangle selectedRegion = new Gdk.Rectangle(Allocation.X + 40, Allocation.Bottom - 100, Allocation.Width - 80, 50);
DrawSelectedColorBox(context, selectedRegion);
}
return(base.OnExposeEvent(evnt));
}
