Xamarin.PropertyEditing.Mac/Controls/Custom/FocusablePopupButton.cs


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44

using System;
using AppKit;
using CoreGraphics;

namespace Xamarin.PropertyEditing.Mac
{
	internal class FocusablePopUpButton : NSPopUpButton
	{
		public override bool CanBecomeKeyView { get { return Enabled; } }

		public ProxyResponder ProxyResponder { get; set; }

		public FocusablePopUpButton ()
		{
			Cell.LineBreakMode = NSLineBreakMode.TruncatingMiddle;
		}

		public override void KeyDown (NSEvent theEvent)
		{
			switch (theEvent.KeyCode) {
			case (int)NSKey.Tab:
				if (ProxyResponder != null) {
					if (theEvent.ModifierFlags.HasFlag(NSEventModifierMask.ShiftKeyMask)) {
						ProxyResponder.PreviousResponder ();
					} else {
						ProxyResponder.NextResponder ();
					}
					return;
				}
				break;
			}
			base.KeyDown (theEvent);
		}

		public override bool BecomeFirstResponder ()
		{
			var willBecomeFirstResponder = base.BecomeFirstResponder ();
			if (willBecomeFirstResponder) {
				ScrollRectToVisible (Bounds);
			}
			return willBecomeFirstResponder;
		}
	}
}