[Mac] Creates a new focusable ComboBox with readonly modifier

Fixes #497

1 files changed, 32 insertions, 0 deletions

diff --git a/Xamarin.PropertyEditing.Mac/Controls/Custom/FocusableComboBox.cs b/Xamarin.PropertyEditing.Mac/Controls/Custom/FocusableComboBox.cs
new file mode 100644
index 0000000..401c2ce
--- /dev/null
+++ b/Xamarin.PropertyEditing.Mac/Controls/Custom/FocusableComboBox.cs
@@ -0,0 +1,32 @@
+using Foundation;
+using AppKit;
+
+namespace Xamarin.PropertyEditing.Mac
+{
+	class FocusableComboBox : NSComboBox
+	{
+		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;
+			}
+		}
+	}
+}
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