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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.ObjectModel;

namespace Tango.Scripting.Editors.Utils
{
	/// <summary>
	/// Provides immutable empty list instances.
	/// </summary>
	static class Empty<T>
	{
		public static readonly T[] Array = new T[0];
		//public static readonly ReadOnlyCollection<T> ReadOnlyCollection = new ReadOnlyCollection<T>(Array);
	}
}
class="c1">// 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.Linq; using System.Collections.Generic; using System.Diagnostics; using System.Windows.Input; using Tango.Scripting.Editors.Document; using Tango.Scripting.Editors.Editing; namespace Tango.Scripting.Editors.Snippets { sealed class SnippetInputHandler : TextAreaStackedInputHandler { readonly InsertionContext context; public SnippetInputHandler(InsertionContext context) : base(context.TextArea) { this.context = context; } public override void Attach() { base.Attach(); SelectElement(FindNextEditableElement(-1, false)); } public override void Detach() { base.Detach(); context.Deactivate(new SnippetEventArgs(DeactivateReason.InputHandlerDetached)); } public override void OnPreviewKeyDown(KeyEventArgs e) { base.OnPreviewKeyDown(e); if (e.Key == Key.Escape) { context.Deactivate(new SnippetEventArgs(DeactivateReason.EscapePressed)); e.Handled = true; } else if (e.Key == Key.Return) { context.Deactivate(new SnippetEventArgs(DeactivateReason.ReturnPressed)); e.Handled = true; } else if (e.Key == Key.Tab) { bool backwards = e.KeyboardDevice.Modifiers == ModifierKeys.Shift; SelectElement(FindNextEditableElement(TextArea.Caret.Offset, backwards)); e.Handled = true; } } void SelectElement(IActiveElement element) { if (element != null) { TextArea.Selection = Selection.Create(TextArea, element.Segment); TextArea.Caret.Offset = element.Segment.EndOffset; } } IActiveElement FindNextEditableElement(int offset, bool backwards) { IEnumerable<IActiveElement> elements = context.ActiveElements.Where(e => e.IsEditable && e.Segment != null); if (backwards) { elements = elements.Reverse(); foreach (IActiveElement element in elements) { if (offset > element.Segment.EndOffset) return element; } } else { foreach (IActiveElement element in elements) { if (offset < element.Segment.Offset) return element; } } return elements.FirstOrDefault(); } } }