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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.ComponentModel;
using Tango.Scripting.Editors.Document;
using Tango.Scripting.Editors.Editing;
using Tango.Scripting.Editors.Rendering;

namespace Tango.Scripting.Editors
{
	/// <summary>
	/// Represents a text editor control (<see cref="TextEditor"/>, <see cref="TextArea"/>
	/// or <see cref="TextView"/>).
	/// </summary>
	public interface ITextEditorComponent : IServiceProvider
	{
		/// <summary>
		/// Gets the document being edited.
		/// </summary>
		TextDocument Document { get; }
		
		/// <summary>
		/// Occurs when the Document property changes (when the text editor is connected to another
		/// document - not when the document content changes).
		/// </summary>
		event EventHandler DocumentChanged;
		
		/// <summary>
		/// Gets the options of the text editor.
		/// </summary>
		TextEditorOptions Options { get; }
		
		/// <summary>
		/// Occurs when the Options property changes, or when an option inside the current option list
		/// changes.
		/// </summary>
		event PropertyChangedEventHandler OptionChanged;
	}
}
ass="w"> 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 } }