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


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using Foundation;
using AppKit;

namespace Xamarin.PropertyEditing.Mac
{
	internal class FocusableComboBox : NSComboBox
	{
		public ProxyResponder ProxyResponder { get; set; }

		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;
		}

		public override bool ShouldBeginEditing (NSText textObject)
		{
			textObject.Delegate = new FocusableComboBoxDelegate ();
			return false;
		}

		public override void DidBeginEditing (NSNotification notification)
		{
			base.DidBeginEditing (notification);
		}

		class FocusableComboBoxDelegate : NSTextDelegate
		{
			public override bool TextShouldEndEditing (NSText textObject)
			{
				return false;
			}

			public override bool TextShouldBeginEditing (NSText textObject)
			{
				return false;
			}
		}
	}
}