Hooking up PropertyButton to ResetCommand.

1 files changed, 56 insertions, 0 deletions

diff --git a/Xamarin.PropertyEditing.Mac/Controls/Custom/CommandMenuItem.cs b/Xamarin.PropertyEditing.Mac/Controls/Custom/CommandMenuItem.cs
new file mode 100644
index 0000000..1cdc73e
--- /dev/null
+++ b/Xamarin.PropertyEditing.Mac/Controls/Custom/CommandMenuItem.cs
@@ -0,0 +1,56 @@
+using System;
+using System.Windows.Input;
+using AppKit;
+
+namespace Xamarin.PropertyEditing.Mac
+{
+	public class CommandMenuItem : NSMenuItem
+	{
+		ICommand command;
+
+		public ICommand Command {
+			get { return command; }
+			set {
+				if (this.command != null)
+					this.command.CanExecuteChanged -= CanExecuteChanged;
+
+				this.command = value;
+				this.command.CanExecuteChanged += CanExecuteChanged;
+			}
+		}
+
+		public CommandMenuItem (string title) : base (title)
+		{
+			HookUpCommandEvents ();
+		}
+
+		public CommandMenuItem (string title, ICommand command) : this (title)
+		{
+			this.Command = command;
+		}
+
+		private void HookUpCommandEvents ()
+		{
+			Activated += (object sender, EventArgs e) => {
+				if (this.command != null)
+					this.command.Execute (null);
+			};
+
+			ValidateMenuItem = ValidatePropertyMenuItem;
+		}
+
+		private bool ValidatePropertyMenuItem (NSMenuItem menuItem)
+		{
+			if (this.command != null)
+				return this.command.CanExecute (null);
+
+			return false;
+		}
+
+		private void CanExecuteChanged (object sender, EventArgs e)
+		{
+			if(sender is ICommand cmd)
+				this.Enabled = cmd.CanExecute (null);
+		}
+	}
+}