void Viewport::drag()
{
drag_offset_ = view_.offset();
+ drag_v_offset_ = view_.owner_visual_v_offset();
}
void Viewport::drag_by(const QPoint &delta)
view_.set_scale_offset(view_.scale(),
(*drag_offset_ - delta.x() * view_.scale()));
+
+ view_.set_v_offset(-drag_v_offset_ - delta.y());
}
void Viewport::drag_release()