Method eventFilter

pj_plotting/widget/src/PlotWidgetBase.cpp:674–749

}

bool PlotWidgetBase::eventFilter(QObject* obj, QEvent* event) {
  if (event->type() == QEvent::Destroy) {
    return false;
  }

  QwtScaleWidget* bottom_axis = plot_->axisWidget(QwtPlot::xBottom);
  QwtScaleWidget* left_axis = plot_->axisWidget(QwtPlot::yLeft);

  if ((obj == bottom_axis || obj == left_axis) && !(isXYPlot() && keepRatioXY()) && event->type() == QEvent::Wheel) {
    auto* wheel_event = static_cast<QWheelEvent*>(event);
    magnifier()->setDefaultMode(obj == bottom_axis ? PlotMagnifier::kXAxis : PlotMagnifier::kYAxis);
    magnifier()->widgetWheelEvent(wheel_event);
  }

  if (obj != plot_->canvas()) {
    return false;
  }

  if (event->type() == QEvent::DragEnter) {
    emit dragEnterSignal(static_cast<QDragEnterEvent*>(event));
    return false;
  }

  if (event->type() == QEvent::DragLeave) {
    emit dragLeaveSignal(static_cast<QDragLeaveEvent*>(event));
    return false;
  }

  if (event->type() == QEvent::Drop) {
    emit dropSignal(static_cast<QDropEvent*>(event));
    return false;
  }

  if (event->type() == QEvent::Wheel) {
    auto* wheel_event = static_cast<QWheelEvent*>(event);
    magnifier()->setDefaultMode(PlotMagnifier::kBothAxes);

    const bool ctrl_modifier = wheel_event->modifiers() == Qt::ControlModifier;
    const QRectF legend_rect = legend()->geometry(plot_->canvas()->rect());
    if (ctrl_modifier && legend()->isVisible() && legend_rect.contains(wheel_event->position())) {
      const int previous_size = legend()->font().pointSize();
      int new_size = previous_size;
      if (wheel_event->angleDelta().y() > 0) {
        new_size = std::min(13, previous_size + 1);
      } else if (wheel_event->angleDelta().y() < 0) {
        new_size = std::max(7, previous_size - 1);
      }
      if (new_size != previous_size) {
        setLegendSize(new_size);
        emit legendSizeChanged(new_size);
      }
      return true;
    }
    return false;
  }

  if (event->type() == QEvent::MouseButtonPress) {
    auto* mouse_event = static_cast<QMouseEvent*>(event);