+void View::centre_cursors()
+{
+ const double time_width = _scale * _viewport->width();
+ _cursors.first()->set_time(_offset + time_width * 0.4);
+ _cursors.second()->set_time(_offset + time_width * 0.6);
+ _cursorheader->update();
+ _viewport->update();
+}
+
+CursorPair& View::cursors()
+{
+ return _cursors;
+}
+
+const CursorPair& View::cursors() const
+{
+ return _cursors;
+}
+
+const QPoint& View::hover_point() const
+{
+ return _hover_point;
+}
+
+void View::normalize_layout()
+{
+ int v_min = INT_MAX;
+ for (const shared_ptr<RowItem> r : *this)
+ v_min = min(r->v_offset(), v_min);
+
+ const int delta = -min(v_min, 0);
+ for (shared_ptr<RowItem> r : *this)
+ r->set_v_offset(r->v_offset() + delta);
+
+ verticalScrollBar()->setSliderPosition(_v_offset + delta);
+ v_scroll_value_changed(verticalScrollBar()->sliderPosition());
+}
+
+void View::update_viewport()
+{
+ assert(_viewport);
+ _viewport->update();
+}
+
+void View::get_scroll_layout(double &length, double &offset) const
+{
+ const pair<double, double> extents = get_time_extents();
+ length = (extents.second - extents.first) / _scale;
+ offset = _offset / _scale;
+}
+
+void View::set_zoom(double scale, int offset)
+{
+ const double cursor_offset = _offset + _scale * offset;
+ const double new_scale = max(min(scale, MaxScale), MinScale);
+ const double new_offset = cursor_offset - new_scale * offset;
+ set_scale_offset(new_scale, new_offset);
+}
+