Question

我正在尝试使用simple tree model，但我无法让该示例在我的项目中有效。

首先，我能够使用QStandardItemModel毫无问题地使用QTreeView。在下面的例子中，我能够看到里面有数据的QTreeView。请参阅工作代码：

constructor{
m_pModel = new QStandardItemModel();
ui.treeViewDevicesList->setModel(m_pModel);
fillTreeView(devicesList);
}

void GatewayDeviceViewerEditor::fillTreeView(const std::vector<Payload> &devicesList)
{
    QVector<QStandardItem *> parents(MAX_PARENTS);
    parents[0] = m_pModel->invisibleRootItem();

    for (vector<Payload>::const_iterator it = devicesList.begin() ; it != devicesList.end(); ++it)
    {
        QStandardItem *pTreeViewItem = new QStandardItem();
        string rootTitle =  it->deviceId + " " + it->deviceName + " " + it->status ;
        pTreeViewItem->setText(rootTitle.c_str());
        parents[0]->appendRow(pTreeViewItem);
       // parents[1] = pTreeViewItem;
    }
}

现在，以下代码无效。我试图将模型子类化。在这种情况下，QTreeView显示但完全空。我猜有些东西我不明白。

entryPoint{
DeviceTreeModel deviceTreeModel(devicesList);
ui.treeViewDevicesList->setModel(&deviceTreeModel);
}

DeviceTreeModel::DeviceTreeModel(const std::vector<Payload> &devicesList, QObject *parent)
    : QAbstractItemModel(parent)
{
    QList<QVariant> rootData;
    rootData << "Title" << "Summary";
    m_pRootItem = new DeviceTreeItem(rootData);
    setupModelData(devicesList, m_pRootItem);
}

void DeviceTreeModel::setupModelData(const std::vector<Payload> &devicesList, DeviceTreeItem *parent)
{
    QList<DeviceTreeItem*> parents;
    parents << parent;


    for (vector<Payload>::const_iterator it = devicesList.begin() ; it != devicesList.end(); ++it)
    {
        string rootTitle =  it->deviceId + " " + it->deviceName + " " + it->status ;
        QString test(rootTitle.c_str());
        QList<QVariant> columnData;
        columnData << test << "Summary";

        parents.last()->appendChild(new DeviceTreeItem(columnData, parents.last()));
    }

}

Answer 1

在entryPoint中，我认为deviceTreeModel需要使用new进行分配，而不是在退出函数时将被销毁的本地实例。

当子类化QAbstractItemModel时，QTreeView中没有显示任何内容

1 个答案: