private void DropPatch(Point location)
{
if (GetColorPatchAt(location) == null)
{
_grabbedPatch.GridLocation = new PointI((int)(location.X / _patchSize), (int)(location.Y / _patchSize));
RaiseColorsModifiedEvent();
}
_grabbedPatch = null;
InvalidateVisual();
}
private void CancelDrag()
{
if (_grabbedPatch == null)
{
return;
}
_isDragging = false;
_grabbedPatch = null;
InvalidateVisual();
}
protected override void OnMouseDown(MouseButtonEventArgs e)
{
base.OnMouseDown(e);
if (e.ChangedButton != MouseButton.Left)
{
return;
}
_dragLocation = e.GetPosition(this);
_mouseDownLocation = _dragLocation;
var patch = GetColorPatchAt(_dragLocation);
if (patch != null)
{
_isDragging = false; // we are not yet dragging until mouse has moved a small distance with the grabbed patch
_grabbedPatch = patch;
InvalidateVisual();
}
}
public ColorPatchRoutedEventArgs(RoutedEvent routedEvent, ColorPatch colorPatch)
: base(routedEvent)
{
ColorPatch = colorPatch;
}