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using System;
using AppKit;
using CoreAnimation;
using CoreGraphics;
using Xamarin.PropertyEditing.Drawing;
namespace Xamarin.PropertyEditing.Mac
{
internal class CommonBrushLayer
: CALayer
{
private const double VerticalMarginOffset = 0.5;
private CGRect frameRect;
public CommonBrushLayer (IHostResourceProvider hostResources)
{
if (hostResources == null)
throw new ArgumentNullException (nameof (hostResources));
this.hostResources = hostResources;
CornerRadius = 3;
BorderColor = new CGColor (.5f, .5f, .5f, .5f);
BorderWidth = 1;
MasksToBounds = true;
}
internal uint VerticalMargin { get; set; }
private CALayer brushLayer;
private CALayer BrushLayer {
get => brushLayer;
set {
if (brushLayer != null)
brushLayer.RemoveFromSuperLayer ();
brushLayer = value;
if (brushLayer != null)
AddSublayer (brushLayer);
}
}
private CommonBrush brush;
public CommonBrush Brush {
get => brush;
set {
brush = value;
BrushLayer = CreateBrushLayer (brush);
Opacity = brush == null ? 0 : 1;
}
}
public static CALayer CreateBrushLayer (CommonBrush brush)
{
switch (brush) {
case CommonSolidBrush solid:
return new CALayer {
BackgroundColor = solid.Color.ToCGColor (),
Opacity = (float)solid.Opacity
};
case CommonGradientBrush gradient:
return new CommonGradientBrushLayer {
Opacity = (float)gradient.Opacity
};
default:
return new CALayer {
BackgroundColor = NSColor.Clear.CGColor
};
}
}
public override void LayoutSublayers ()
{
base.LayoutSublayers ();
if (frameRect.IsEmpty)
frameRect = new CGRect (Frame.X, Bounds.Y + VerticalMargin + VerticalMarginOffset, Bounds.Width, Bounds.Height - (VerticalMargin * 2));
Frame = frameRect;
BrushLayer.Frame = Bounds;
Contents = DrawingExtensions.GenerateCheckerboard (Bounds, this.hostResources.GetNamedColor (NamedResources.Checkerboard0Color), this.hostResources.GetNamedColor (NamedResources.Checkerboard1Color));
}
public NSImage RenderPreview ()
{
var scale = this.ContentsScale;
// The double cast below is needed for now, while Width/Height/scale are of type ObjCRuntime.nfloat
// in order for the floating point to integral conversion to work properly. Later when ObjCRuntime.nfloat
// is replaced with System.Runtime.InteropServices.NFloat that won't be needed (but can't hurt).
nint h = (nint)(double)(this.Bounds.Height * scale);
nint w = (nint)(double)(this.Bounds.Width * scale);
nint bytesPerRow = w * 4;
if (h <= 0 || w <= 0)
return null;
using (var colorSpace = CGColorSpace.CreateGenericRgb ())
using (var context = new CGBitmapContext (IntPtr.Zero, w, h, 8, bytesPerRow, colorSpace, CGImageAlphaInfo.PremultipliedLast)) {
this.RenderInContext (context);
using (var image = context.ToImage ()) {
return new NSImage (image, new CGSize (w, h));
}
}
}
private readonly IHostResourceProvider hostResources;
}
}
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