public void Execute(bool up)
{
IWpfTextView textView = GetTextView();
ITextSnapshot snapshot = textView.TextSnapshot;
if (snapshot != snapshot.TextBuffer.CurrentSnapshot)
{
return;
}
string sourceText = "";
int selectionLastLineNumber = 0;
int selectionFirstLineNumber = 0;
int selectionStartLineOffset = 0;
int selectionLength = 0;
int caretLineOffset = 0;
bool noInitialSelection = false;
bool caretAtTheEndOfSelection = true;
int caretPos = textView.GetCaretPosition();
caretLineOffset = caretPos - textView.GetCaretLine().Start.Position;
if (!textView.Selection.IsEmpty)
{
caretAtTheEndOfSelection = (textView.Selection.Start.Position != caretPos);
if (textView.Selection.Start.Position < textView.Selection.End.Position)
{
selectionStartLineOffset = textView.Selection.Start.Position - textView.Selection.Start.Position.GetContainingLine().Start.Position;
selectionLength = textView.Selection.End.Position - textView.Selection.Start.Position;
}
else
{
selectionStartLineOffset = textView.Selection.End.Position - textView.Selection.Start.Position.GetContainingLine().End.Position;
selectionLength = textView.Selection.Start.Position - textView.Selection.End.Position;
}
selectionLastLineNumber = textView.Selection.End.Position.GetContainingLine().LineNumber;
selectionFirstLineNumber = textView.Selection.Start.Position.GetContainingLine().LineNumber;
var builder = new StringBuilder();
for (int i = selectionFirstLineNumber; i <= selectionLastLineNumber; i++)
{
builder.AppendLine(snapshot.GetLineFromLineNumber(i).GetText());
}
sourceText = builder.ToString();
textView.Selection.Clear();
}
else
{
noInitialSelection = true;
selectionLength =
selectionStartLineOffset = 0;
selectionFirstLineNumber =
selectionLastLineNumber = textView.GetCaretLine().End.GetContainingLine().LineNumber;
sourceText = textView.Caret.ContainingTextViewLine.ExtentIncludingLineBreak.GetText();
}
int insertionPosition;
//int finalCaretPosition;
using (ITextEdit edit = textView.TextBuffer.CreateEdit())
{
int lineCount = selectionLastLineNumber - selectionFirstLineNumber + 1;
try
{
for (int i = selectionLastLineNumber; i >= selectionFirstLineNumber; i--)
{
var line = edit.Snapshot.GetLineFromLineNumber(i);
edit.Delete(new Span(line.Start.Position, line.LengthIncludingLineBreak));
}
}
catch
{
}
if (up)
{
if (selectionFirstLineNumber == 0)
{
insertionPosition = 0;
}
else
{
insertionPosition = edit.Snapshot.GetLineFromLineNumber(selectionFirstLineNumber - 1).Start.Position;
}
}
else
{
insertionPosition = edit.Snapshot.GetLineFromLineNumber(selectionFirstLineNumber + lineCount).ExtentIncludingLineBreak.End.Position;
}
edit.Insert(insertionPosition, sourceText);
edit.Apply();
}
int selectionStartUp = (noInitialSelection ? insertionPosition + caretLineOffset : insertionPosition + selectionStartLineOffset);
int selectionStartDown = (noInitialSelection ? insertionPosition - sourceText.Length + caretLineOffset : (insertionPosition - sourceText.Length) + selectionStartLineOffset);
int selectionStart = (up ? selectionStartUp : selectionStartDown);
textView.SetSelection(selectionStart, selectionLength);
if (caretAtTheEndOfSelection)
{
textView.MoveCaretTo(selectionStart + selectionLength);
}
else
{
textView.MoveCaretTo(selectionStart);
}
int caretLineNumber = textView.GetLineFromPosition(textView.GetCaretPosition()).LineNumber;
if (up)
{
if ((caretLineNumber - textView.VisualSnapshot.Lines.First().LineNumber) < 5)
{
textView.ViewScroller.ScrollViewportVerticallyByLine(ScrollDirection.Up);
}
}
else
{
if ((textView.VisualSnapshot.Lines.Last().LineNumber - caretLineNumber) < 5)
{
textView.ViewScroller.ScrollViewportVerticallyByLine(ScrollDirection.Down);
}
}
if (textView.IsCaretClosToHorizontalEdge(up))
{
textView.ViewScroller.ScrollViewportVerticallyByLines(up ? ScrollDirection.Up : ScrollDirection.Down, 1);
}
}