[mac] Ignore change events if no resources

Seems like we might be getting chang events even when not visible so let's ignore them
if we don't actually have a resource selector. The search box gets added regardless to
simplify putting it at the end.

1 files changed, 10 insertions, 5 deletions

diff --git a/Xamarin.PropertyEditing.Mac/Controls/Custom/BrushTabViewController.cs b/Xamarin.PropertyEditing.Mac/Controls/Custom/BrushTabViewController.cs
index 08cea38..7dad34d 100644
--- a/Xamarin.PropertyEditing.Mac/Controls/Custom/BrushTabViewController.cs
+++ b/Xamarin.PropertyEditing.Mac/Controls/Custom/BrushTabViewController.cs
@@ -29,11 +29,7 @@ namespace Xamarin.PropertyEditing.Mac
 				PlaceholderString = Properties.Resources.SearchResourcesTitle,

 			};

 

-			this.filterResource.Changed += (sender, e) => {

-				ViewModel.ResourceSelector.FilterText = this.filterResource.Cell.Title;

-				this.resource.ReloadData ();

-			};

-

+			this.filterResource.Changed += OnResourceFilterChanged;

 			this.filterResource.Hidden = true;

 

 			TabStack.AddView (this.filterResource, NSStackViewGravity.Leading);
@@ -194,5 +190,14 @@ namespace Xamarin.PropertyEditing.Mac
 

 		private NSSearchField filterResource;

 		private ResourceBrushViewController resource;
+
+		private void OnResourceFilterChanged (object sender, EventArgs e)
+		{
+			if (ViewModel.ResourceSelector == null)
+				return;
+
+			ViewModel.ResourceSelector.FilterText = this.filterResource.Cell.Title;
+			this.resource.ReloadData ();
+		}
 	}
 }