void textArea_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
mode = SelectionMode.None;
if (!e.Handled && e.ChangedButton == MouseButton.Left)
{
ModifierKeys modifiers = Keyboard.Modifiers;
bool shift = (modifiers & ModifierKeys.Shift) == ModifierKeys.Shift;
if (enableTextDragDrop && e.ClickCount == 1 && !shift)
{
int visualColumn;
int offset = GetOffsetFromMousePosition(e, out visualColumn);
if (textArea.Selection.Contains(offset))
{
if (textArea.CaptureMouse())
{
mode = SelectionMode.PossibleDragStart;
possibleDragStartMousePos = e.GetPosition(textArea);
}
e.Handled = true;
return;
}
}
var oldPosition = textArea.Caret.Position;
SetCaretOffsetToMousePosition(e);
if (!shift)
{
textArea.ClearSelection();
}
if (textArea.CaptureMouse())
{
if ((modifiers & ModifierKeys.Alt) == ModifierKeys.Alt && textArea.Options.EnableRectangularSelection)
{
mode = SelectionMode.Rectangular;
if (shift && textArea.Selection is RectangleSelection)
{
textArea.Selection = textArea.Selection.StartSelectionOrSetEndpoint(oldPosition, textArea.Caret.Position);
}
}
else if (e.ClickCount == 1 && ((modifiers & ModifierKeys.Control) == 0))
{
mode = SelectionMode.Normal;
if (shift && !(textArea.Selection is RectangleSelection))
{
textArea.Selection = textArea.Selection.StartSelectionOrSetEndpoint(oldPosition, textArea.Caret.Position);
}
}
else
{
SimpleSegment startWord;
if (e.ClickCount == 3)
{
mode = SelectionMode.WholeLine;
startWord = GetLineAtMousePosition(e);
}
else
{
mode = SelectionMode.WholeWord;
startWord = GetWordAtMousePosition(e);
}
if (startWord == SimpleSegment.Invalid)
{
mode = SelectionMode.None;
textArea.ReleaseMouseCapture();
return;
}
if (shift && !textArea.Selection.IsEmpty)
{
if (startWord.Offset < textArea.Selection.SurroundingSegment.Offset)
{
textArea.Selection = textArea.Selection.SetEndpoint(new TextViewPosition(textArea.Document.GetLocation(startWord.Offset)));
}
else if (startWord.EndOffset > textArea.Selection.SurroundingSegment.EndOffset)
{
textArea.Selection = textArea.Selection.SetEndpoint(new TextViewPosition(textArea.Document.GetLocation(startWord.EndOffset)));
}
this.startWord = new AnchorSegment(textArea.Document, textArea.Selection.SurroundingSegment);
}
else
{
textArea.Selection = Selection.Create(textArea, startWord.Offset, startWord.EndOffset);
this.startWord = new AnchorSegment(textArea.Document, startWord.Offset, startWord.Length);
}
}
}
}
e.Handled = true;
}
