+
+ if (event->orientation() == Qt::Vertical) {
+ // Vertical scrolling is interpreted as zooming in/out
+ _view.zoom(event->delta() / 120, event->x());
+ } else if (event->orientation() == Qt::Horizontal) {
+ // Horizontal scrolling is interpreted as moving left/right
+ _view.set_scale_offset(_view.scale(),
+ event->delta() * _view.scale()
+ + _view.offset());
+ }
+}
+
+void Viewport::draw_cursors_background(QPainter &p)
+{
+ if (!_view.cursors_shown())
+ return;
+
+ p.setPen(Qt::NoPen);
+ p.setBrush(QBrush(View::CursorAreaColour));
+
+ const pair<Cursor, Cursor> &c = _view.cursors();
+ const float x1 = (c.first.time() - _view.offset()) / _view.scale();
+ const float x2 = (c.second.time() - _view.offset()) / _view.scale();
+ const int l = (int)max(min(x1, x2), 0.0f);
+ const int r = (int)min(max(x1, x2), (float)width());
+
+ p.drawRect(l, 0, r - l, height());
+}
+
+void Viewport::draw_cursors_foreground(QPainter &p)
+{
+ if (!_view.cursors_shown())
+ return;
+
+ const QRect r = rect();
+ pair<Cursor, Cursor> &cursors = _view.cursors();
+ cursors.first.paint(p, r);
+ cursors.second.paint(p, r);
+}
+
+void Viewport::on_signals_moved()
+{
+ update();