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using System;
using AppKit;
using CoreAnimation;
using CoreGraphics;
using Xamarin.PropertyEditing.Drawing;
namespace Xamarin.PropertyEditing.Mac
{
class HueLayer : ColorEditorLayer
{
private const float BorderRadius = 3;
private const float GripRadius = 3;
private readonly ChannelEditor hueEditor = new HsbHueChannelEditor ();
public CGColor GripColor {
get => grip.BorderColor;
set => grip.BorderColor = value;
}
public HueLayer ()
{
Initialize ();
}
public HueLayer (IntPtr handle) : base (handle)
{
}
private void Initialize ()
{
this.hueEditor.UpdateGradientLayer (this.colors, new CommonColor (0, 255, 0));
AddSublayer (colors);
AddSublayer (grip);
}
private readonly CAGradientLayer colors = new CAGradientLayer {
BorderColor = new CGColor (.5f, .5f, .5f, .5f),
StartPoint = new CGPoint (0, 1),
EndPoint = new CGPoint (0, 0),
BorderWidth = 1,
CornerRadius = BorderRadius,
};
private readonly CALayer grip = new UnanimatedLayer {
BorderColor = NSColor.Text.CGColor,
BorderWidth = 2,
CornerRadius = GripRadius,
};
public override void UpdateFromModel (EditorInteraction interaction)
{
LayoutIfNeeded ();
var color = interaction.Color;
var loc = this.hueEditor.LocationFromColor (this.colors, color);
this.grip.Frame = new CGRect (1, loc.Y - this.grip.Frame.Height / 2f, this.Frame.Width, this.grip.Frame.Height);
}
public override void UpdateFromLocation (EditorInteraction interaction, CGPoint location)
{
var clos = Math.Min (this.colors.Frame.Height, Math.Max (0, location.Y - this.colors.Frame.Y));
this.grip.Frame = new CGRect (
1,
clos + this.colors.Frame.Y - this.grip.Frame.Height * 0.5f,
Frame.Width - 2,
2 * GripRadius);
if (interaction == null)
return;
var color = interaction.Color;
interaction.Color = this.hueEditor.UpdateColorFromLocation (
this.colors,
color,
location);
}
public override void Commit (EditorInteraction interaction)
{
interaction.ViewModel.CommitLastColor ();
}
public override void LayoutSublayers ()
{
base.LayoutSublayers ();
this.colors.Frame = Bounds;
this.grip.Frame = new CGRect (
this.grip.Frame.X,
this.grip.Frame.Y,
Frame.Width - 2,
2 * GripRadius);
}
}
}
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