/// <inheritdoc/>
protected override void OnMouseLeftButtonDown(MouseButtonEventArgs e)
{
base.OnMouseLeftButtonDown(e);
if (!e.Handled && TextView != null && textArea != null)
{
e.Handled = true;
textArea.Focus();
SimpleSegment currentSeg = GetTextLineSegment(e);
if (currentSeg == SimpleSegment.Invalid)
{
return;
}
textArea.Caret.Offset = currentSeg.Offset + currentSeg.Length;
if (CaptureMouse())
{
selecting = true;
selectionStart = new AnchorSegment(Document, currentSeg.Offset, currentSeg.Length);
if ((Keyboard.Modifiers & ModifierKeys.Shift) == ModifierKeys.Shift)
{
SimpleSelection simpleSelection = textArea.Selection as SimpleSelection;
if (simpleSelection != null)
{
selectionStart = new AnchorSegment(Document, simpleSelection.SurroundingSegment);
}
}
textArea.Selection = Selection.Create(textArea, selectionStart);
if ((Keyboard.Modifiers & ModifierKeys.Shift) == ModifierKeys.Shift)
{
ExtendSelection(currentSeg);
}
textArea.Caret.BringCaretToView(5.0);
}
}
}
void textArea_Drop(object sender, DragEventArgs e)
{
try {
DragDropEffects effect = GetEffect(e);
e.Effects = effect;
if (effect != DragDropEffects.None)
{
int start = textArea.Caret.Offset;
if (mode == MouseSelectionMode.Drag && textArea.Selection.Contains(start))
{
Debug.WriteLine("Drop: did not drop: drop target is inside selection");
e.Effects = DragDropEffects.None;
}
else
{
Debug.WriteLine("Drop: insert at " + start);
var pastingEventArgs = new DataObjectPastingEventArgs(e.Data, true, DataFormats.UnicodeText);
textArea.RaiseEvent(pastingEventArgs);
if (pastingEventArgs.CommandCancelled)
{
return;
}
string text = EditingCommandHandler.GetTextToPaste(pastingEventArgs, textArea);
if (text == null)
{
return;
}
bool rectangular = pastingEventArgs.DataObject.GetDataPresent(RectangleSelection.RectangularSelectionDataType);
// Mark the undo group with the currentDragDescriptor, if the drag
// is originating from the same control. This allows combining
// the undo groups when text is moved.
textArea.Document.UndoStack.StartUndoGroup(this.currentDragDescriptor);
try {
if (rectangular && RectangleSelection.PerformRectangularPaste(textArea, textArea.Caret.Position, text, true))
{
}
else
{
textArea.Document.Insert(start, text);
textArea.Selection = Selection.Create(textArea, start, start + text.Length);
}
} finally {
textArea.Document.UndoStack.EndUndoGroup();
}
}
e.Handled = true;
}
} catch (Exception ex) {
OnDragException(ex);
}
}
void ExtendSelection(SimpleSegment currentSeg)
{
if (currentSeg.Offset < selectionStart.Offset)
{
textArea.Caret.Offset = currentSeg.Offset;
textArea.Selection = Selection.Create(textArea, currentSeg.Offset, selectionStart.Offset + selectionStart.Length);
}
else
{
textArea.Caret.Offset = currentSeg.Offset + currentSeg.Length;
textArea.Selection = Selection.Create(textArea, selectionStart.Offset, currentSeg.Offset + currentSeg.Length);
}
}
void ExtendSelectionToMouse(MouseEventArgs e)
{
TextViewPosition oldPosition = textArea.Caret.Position;
if (mode == MouseSelectionMode.Normal || mode == MouseSelectionMode.Rectangular)
{
SetCaretOffsetToMousePosition(e);
if (mode == MouseSelectionMode.Normal && textArea.Selection is RectangleSelection)
{
textArea.Selection = new SimpleSelection(textArea, oldPosition, textArea.Caret.Position);
}
else if (mode == MouseSelectionMode.Rectangular && !(textArea.Selection is RectangleSelection))
{
textArea.Selection = new RectangleSelection(textArea, oldPosition, textArea.Caret.Position);
}
else
{
textArea.Selection = textArea.Selection.StartSelectionOrSetEndpoint(oldPosition, textArea.Caret.Position);
}
}
else if (mode == MouseSelectionMode.WholeWord || mode == MouseSelectionMode.WholeLine)
{
var newWord = (mode == MouseSelectionMode.WholeLine) ? GetLineAtMousePosition(e) : GetWordAtMousePosition(e);
if (newWord != SimpleSegment.Invalid)
{
textArea.Selection = Selection.Create(textArea,
Math.Min(newWord.Offset, startWord.Offset),
Math.Max(newWord.EndOffset, startWord.EndOffset));
// moves caret to start or end of selection
if (newWord.Offset < startWord.Offset)
{
textArea.Caret.Offset = newWord.Offset;
}
else
{
textArea.Caret.Offset = Math.Max(newWord.EndOffset, startWord.EndOffset);
}
}
}
textArea.Caret.BringCaretToView(5.0);
}
/// <inheritdoc/>
public override Selection UpdateOnDocumentChange(DocumentChangeEventArgs e)
{
if (e == null)
{
throw new ArgumentNullException("e");
}
int newStartOffset, newEndOffset;
if (startOffset <= endOffset)
{
newStartOffset = e.GetNewOffset(startOffset, AnchorMovementType.Default);
newEndOffset = Math.Max(newStartOffset, e.GetNewOffset(endOffset, AnchorMovementType.BeforeInsertion));
}
else
{
newEndOffset = e.GetNewOffset(endOffset, AnchorMovementType.Default);
newStartOffset = Math.Max(newEndOffset, e.GetNewOffset(startOffset, AnchorMovementType.BeforeInsertion));
}
return(Selection.Create(
textArea,
new TextViewPosition(textArea.Document.GetLocation(newStartOffset), start.VisualColumn),
new TextViewPosition(textArea.Document.GetLocation(newEndOffset), end.VisualColumn)
));
}
void textArea_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
mode = MouseSelectionMode.None;
if (textArea.Document == null)
{
// Avoid entering any selection mode when there's no document attached.
return;
}
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;
bool isAtEndOfLine;
int offset = GetOffsetFromMousePosition(e, out visualColumn, out isAtEndOfLine);
if (textArea.Selection.Contains(offset))
{
if (textArea.CaptureMouse())
{
mode = MouseSelectionMode.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 = MouseSelectionMode.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 = MouseSelectionMode.Normal;
if (shift && !(textArea.Selection is RectangleSelection))
{
textArea.Selection = textArea.Selection.StartSelectionOrSetEndpoint(oldPosition, textArea.Caret.Position);
}
}
else
{
SimpleSegment startWord;
if (e.ClickCount == 3)
{
mode = MouseSelectionMode.WholeLine;
startWord = GetLineAtMousePosition(e);
}
else
{
mode = MouseSelectionMode.WholeWord;
startWord = GetWordAtMousePosition(e);
}
if (startWord == SimpleSegment.Invalid)
{
mode = MouseSelectionMode.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;
}