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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.Linq;
using System.Collections.Generic;
using System.Diagnostics;
using System.Windows.Input;
using ICSharpCode.AvalonEdit.Document;
using ICSharpCode.AvalonEdit.Editing;
namespace ICSharpCode.AvalonEdit.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();
}
}
}
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