internal void RaiseChangedEvent(bool emptyBefore, bool emptyAfter, bool moved)
{
if (moved || (emptyBefore != emptyAfter))
{
//Force the selected spans to be recomputed (if needed).
_virtualSelectedSpans = null;
_selectedSpans = null;
}
if (moved || !(emptyBefore && emptyAfter))
{
// Inform listeners of this change
_guardedOperations.RaiseEvent(this, SelectionChanged);
}
}
private void InternalMoveCaret(VirtualSnapshotPoint bufferPosition, PositionAffinity caretAffinity, ITextViewLine textLine, bool captureHorizontalPosition, bool captureVerticalPosition, bool raiseEvent)
{
CaretPosition oldPosition = this.Position;
_caretAffinity = caretAffinity;
_insertionPoint = bufferPosition;
_forceVirtualSpace = _insertionPoint.IsInVirtualSpace && !this.IsVirtualSpaceOrBoxSelectionEnabled;
_emptySelection = _wpfTextView.Selection.IsEmpty;
_isContainedByView = (textLine.VisibilityState != VisibilityState.Unattached);
double xCoordinate;
double width;
if (bufferPosition.IsInVirtualSpace || textLine.End == bufferPosition.Position)
{
//Never show overwrite caret when at the physical end of a line.
this.OverwriteMode = false;
}
else
{
//Position is in the interior of the line ... preferred position is based strictly on the bufferPosition.
this.OverwriteMode = _wpfTextView.Options.IsOverwriteModeEnabled() && _emptySelection;
}
// if we're in overwrite mode, draw a rectangle covering the text element, otherwise, just
// draw a thin line
if (_overwriteMode)
{
Microsoft.VisualStudio.Text.Formatting.TextBounds bounds = textLine.GetExtendedCharacterBounds(bufferPosition);
xCoordinate = bounds.Left;
width = bounds.Width;
}
else
{
xCoordinate = GetXCoordinateFromVirtualBufferPosition(textLine, bufferPosition);
width = 10;//TODO: SystemParameters.CaretWidth;
}
_bounds = new SKRect((float)xCoordinate, (float)textLine.TextTop, (float)(xCoordinate + width), (float)textLine.TextBottom);
CapturePreferredPositions(captureHorizontalPosition, captureVerticalPosition);
CaretPosition newPosition = this.Position;
if (newPosition != oldPosition)
{
this.UpdateBlinkTimer();
if (raiseEvent)
{
if (_selection.IsEmpty)
{
//Empty selections are logically located at the caret position, so force a selection changed event to be raised
//before any of the caret position changed events.
_selection.RaiseChangedEvent(emptyBefore: true, emptyAfter: true, moved: true);
}
// Inform this change to interested parties
EventHandler <CaretPositionChangedEventArgs> positionChanged = this.PositionChanged;
if (positionChanged != null)
{
_guardedOperations.RaiseEvent <CaretPositionChangedEventArgs>(this, positionChanged, new CaretPositionChangedEventArgs(_wpfTextView, oldPosition, newPosition));
}
}
}
this.InvalidateVisual();
_updateNeeded = true;
}