C++ (Cpp) QListView::scrollTo示例

// Type: 0 = static, 1 = mission
void HWMapContainer::mapChanged(const QModelIndex & map, int type, const QModelIndex & old)
{
    QListView * mapList;

    if (type == 0)      mapList = staticMapList;
    else if (type == 1) mapList = missionMapList;
    else                return;

    // Make sure it is a valid index
    if (!map.isValid())
    {
        if (old.isValid())
        {
            mapList->setCurrentIndex(old);
            mapList->scrollTo(old);
        }
        else
        {
            m_mapInfo.type = MapModel::Invalid;
            updatePreview();
        }

        return;
    }

    // If map changed, update list selection
    if (mapList->currentIndex() != map)
    {
        mapList->setCurrentIndex(map);
        mapList->scrollTo(map);
    }

    if (map.data(Qt::UserRole + 1).canConvert<MapModel::MapInfo>())
        setMapInfo(map.data(Qt::UserRole + 1).value<MapModel::MapInfo>());
    else
        Q_ASSERT(false); // Houston, we have a problem.

}