1 files changed, 120 insertions, 0 deletions
diff --git a/Software/Visual_Studio/Scripting/Tango.Scripting.Editors/Editing/TextAreaDefaultInputHandlers.cs b/Software/Visual_Studio/Scripting/Tango.Scripting.Editors/Editing/TextAreaDefaultInputHandlers.cs
new file mode 100644
index 000000000..7101d16c8
--- /dev/null
+++ b/Software/Visual_Studio/Scripting/Tango.Scripting.Editors/Editing/TextAreaDefaultInputHandlers.cs
@@ -0,0 +1,120 @@
+// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
+// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
+
+using System;
+using System.Collections.Generic;
+using System.Windows;
+using System.Windows.Input;
+
+using Tango.Scripting.Editors.Document;
+
+namespace Tango.Scripting.Editors.Editing
+{
+	/// <summary>
+	/// Contains the predefined input handlers.
+	/// </summary>
+	public class TextAreaDefaultInputHandler : TextAreaInputHandler
+	{
+		/// <summary>
+		/// Gets the caret navigation input handler.
+		/// </summary>
+		public TextAreaInputHandler CaretNavigation { get; private set; }
+		
+		/// <summary>
+		/// Gets the editing input handler.
+		/// </summary>
+		public TextAreaInputHandler Editing { get; private set; }
+		
+		/// <summary>
+		/// Gets the mouse selection input handler.
+		/// </summary>
+		public ITextAreaInputHandler MouseSelection { get; private set; }
+		
+		/// <summary>
+		/// Creates a new TextAreaDefaultInputHandler instance.
+		/// </summary>
+		public TextAreaDefaultInputHandler(TextArea textArea) : base(textArea)
+		{
+			this.NestedInputHandlers.Add(CaretNavigation = CaretNavigationCommandHandler.Create(textArea));
+			this.NestedInputHandlers.Add(Editing = EditingCommandHandler.Create(textArea));
+			this.NestedInputHandlers.Add(MouseSelection = new SelectionMouseHandler(textArea));
+			
+			this.CommandBindings.Add(new CommandBinding(ApplicationCommands.Undo, ExecuteUndo, CanExecuteUndo));
+			this.CommandBindings.Add(new CommandBinding(ApplicationCommands.Redo, ExecuteRedo, CanExecuteRedo));
+		}
+		
+		internal static KeyBinding CreateFrozenKeyBinding(ICommand command, ModifierKeys modifiers, Key key)
+		{
+			KeyBinding kb = new KeyBinding(command, key, modifiers);
+			// Mark KeyBindings as frozen because they're shared between multiple editor instances.
+			// KeyBinding derives from Freezable only in .NET 4, so we have to use this little trick:
+			Freezable f = ((object)kb) as Freezable;
+			if (f != null)
+				f.Freeze();
+			return kb;
+		}
+		
+		internal static void WorkaroundWPFMemoryLeak(List<InputBinding> inputBindings)
+		{
+			// Work around WPF memory leak:
+			// KeyBinding retains a reference to whichever UIElement it is used in first.
+			// Using a dummy element for this purpose ensures that we don't leak
+			// a real text editor (with a potentially large document).
+			UIElement dummyElement = new UIElement();
+			dummyElement.InputBindings.AddRange(inputBindings);
+		}
+		
+		#region Undo / Redo
+		UndoStack GetUndoStack()
+		{
+			TextDocument document = this.TextArea.Document;
+			if (document != null)
+				return document.UndoStack;
+			else
+				return null;
+		}
+		
+		void ExecuteUndo(object sender, ExecutedRoutedEventArgs e)
+		{
+			var undoStack = GetUndoStack();
+			if (undoStack != null) {
+				if (undoStack.CanUndo) {
+					undoStack.Undo();
+					this.TextArea.Caret.BringCaretToView();
+				}
+				e.Handled = true;
+			}
+		}
+		
+		void CanExecuteUndo(object sender, CanExecuteRoutedEventArgs e)
+		{
+			var undoStack = GetUndoStack();
+			if (undoStack != null) {
+				e.Handled = true;
+				e.CanExecute = undoStack.CanUndo;
+			}
+		}
+		
+		void ExecuteRedo(object sender, ExecutedRoutedEventArgs e)
+		{
+			var undoStack = GetUndoStack();
+			if (undoStack != null) {
+				if (undoStack.CanRedo) {
+					undoStack.Redo();
+					this.TextArea.Caret.BringCaretToView();
+				}
+				e.Handled = true;
+			}
+		}
+		
+		void CanExecuteRedo(object sender, CanExecuteRoutedEventArgs e)
+		{
+			var undoStack = GetUndoStack();
+			if (undoStack != null) {
+				e.Handled = true;
+				e.CanExecute = undoStack.CanRedo;
+			}
+		}
+		#endregion
+	}
+}