當子類化QAbstractItemModel，沒有顯示在QTreeView

Question

我試圖使用simple tree model，但我無法使我的項目中的示例工程。

首先，我可以在沒有問題的情況下使用QTreeView和QStandardItemModel。在以下情況下，我可以看到我的QTreeView裏面有數據。請參閱工作代碼：

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; 
    } 
} 

現在，下面的代碼不起作用。我正在試圖對模型進行子類化。在那種情況下，QTreeView顯示出來，但完全是空的。有些東西我猜我不明白。

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，我認爲deviceTreeModel需要與new被分配的，而不是作爲一個本地實例退出函數時將被銷燬。