[Xwt] Add simple method to register autocompletion data on entry widg…

…ets.

Currently only implemented for the Gtk+ backend.

Xwt.Gtk/Xwt.GtkBackend/TextEntryBackend.cs

@@ -174,6 +174,23 @@ public override void Initialize ()
 		public bool MultiLine {
 			get; set;
 		}
+
+		public void SetCompletions (string[] completions)
+		{
+			if (completions == null || completions.Length = 0) {
+				Widget.Completion = null;
+				return;
+			}
+
+			var model = new Gtk.ListStore (typeof(string));
+			foreach (var c in completions)
+				model.SetValue (model.Append (), 0, c);
+			Widget.Completion = new Gtk.EntryCompletion () {
+				Model = model,
+				PopupCompletion = true,
+				TextColumn = 0
+			};
+		}
 
 		public override void EnableEvent (object eventId)
 		{

Xwt.WPF/Xwt.WPFBackend/TextEntryBackend.cs

@@ -155,6 +155,10 @@ public bool ShowFrame
 			}
 		}
 
+		public void SetCompletions (string[] completions)
+		{
+		}
+
 		public override void EnableEvent (object eventId)
 		{
 			base.EnableEvent (eventId);

Xwt.XamMac/Xwt.Mac/TextEntryBackend.cs

@@ -238,6 +238,10 @@ void HandleSelectionChanged ()
 			}
 		}
 
+		public void SetCompletions (string[] completions)
+		{
+		}
+
 		#endregion
 
 

Xwt/Xwt.Backends/ITextEntryBackend.cs

@@ -39,6 +39,7 @@ public interface ITextEntryBackend: IWidgetBackend
 		int SelectionStart { get; set; }
 		int SelectionLength { get; set; }
 		string SelectedText { get; set; }
+		void SetCompletions (string[] completions);
 	}
 
 	public interface ITextEntryEventSink: IWidgetEventSink

Xwt/Xwt/TextEntry.cs

@@ -136,6 +136,11 @@ protected override BackendHost CreateBackendHost ()
 			set { Backend.MultiLine = value; }
 		}
 
+		public void SetCompletions (string[] completions)
+		{
+			Backend.SetCompletions (completions);
+		}
+
 		protected virtual void OnChanged (EventArgs e)
 		{
 			if (changed != null)