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// 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
}
}
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