Merge pull request #502 from xamarin/focusable-combobox

[Mac] Creates a new focusable ComboBox with readonly modifier

Author: ermau

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;
+			}
+		}
+	}
+}

Xamarin.PropertyEditing.Mac/Controls/PredefinedValuesEditor.cs

@@ -20,12 +20,11 @@ public PredefinedValuesEditor (IHostResourceProvider hostResources)
 		{
 			base.TranslatesAutoresizingMaskIntoConstraints = false;
 
-			this.comboBox = new NSComboBox {
+			this.comboBox = new FocusableComboBox {
 				TranslatesAutoresizingMaskIntoConstraints = false,
 				BackgroundColor = NSColor.Clear,
 				StringValue = String.Empty,
 				ControlSize = NSControlSize.Small,
-				Editable = false,
 				Font = NSFont.FromFontName(DefaultFontName, DefaultFontSize),
 			};
 

Xamarin.PropertyEditing.Mac/Xamarin.PropertyEditing.Mac.csproj

@@ -144,6 +144,7 @@
     <Compile Include="HostResourceProvider.cs" />
     <Compile Include="Controls\Custom\DynamicFillBox.cs" />
     <Compile Include="Controls\Custom\TabButton.cs" />
+    <Compile Include="Controls\Custom\FocusableComboBox.cs" />
   </ItemGroup>
   <ItemGroup>
     <Folder Include="Controls\" />