treeview数据的保存和读取（以表格方式保存）

一个简单的treeivew，以表格方式保存比较简单，遍历所有节点，记录parentNode、node、data即可

如何将表格转为tree数据，代码如下：

#include "mainwindow.h"
#include <QtWidgets>

struct DataInfo{
    QString id;
    QString name;
    QString parentId;
};
struct DataNode{
    DataInfo info;
    QMap<QString, DataNode> child;
};

void print(QMap<QString, DataNode> map)
{
    for(auto d = map.begin(); d != map.end(); d ++) {
        auto k = d.value();
        qDebug() << __LINE__ << d.key() << k.info.name;
        print(k.child);
    }
}
void fillTree(QMap<QString, DataNode> map, QStandardItem *item)
{
    for(auto k = map.begin(); k != map.end(); k ++) {
        DataNode d = k.value();
        QStandardItem *itm = new QStandardItem;
        itm->setText(d.info.name);
        item->appendRow(itm);
        fillTree(d.child, itm);
    }
}


int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    QList<DataInfo> infoList;
    infoList << DataInfo{"002", "xx2", "001"};
    infoList << DataInfo{"005", "xx5", "000"};
    infoList << DataInfo{"003", "xx3", "001"};
    infoList << DataInfo{"006", "xx6", "002"};
    infoList << DataInfo{"007", "xx7", "001"};
    infoList << DataInfo{"000", "xx0", "001"};
    infoList << DataInfo{"001", "xx1", "-1"};
    infoList << DataInfo{"004", "xx4", "007"};
    //生成树状图
    QMap<QString, DataNode> dataMap;
    QMap<QString, DataNode*> ptrMap;
    for(auto d : infoList) {
        //父节点存在 并且 子节点存在
        if(ptrMap.contains(d.parentId) && ptrMap.contains(d.id)) {
            ptrMap[d.id]->info = d;
            ptrMap[d.parentId]->child[d.id] = dataMap.take(d.id);
            ptrMap.insert(d.id, &ptrMap[d.parentId]->child[d.id]);
            continue;
        }
        //父节点存在 并且 子节点不存在
        if(ptrMap.contains(d.parentId)) {
            ptrMap[d.parentId]->child[d.id].info = d;
            ptrMap.insert(d.id, &ptrMap[d.parentId]->child[d.id]);
            continue;
        }
        //父节点不存在 并且 子节点存在
        if(ptrMap.contains(d.id)) {
            ptrMap[d.id]->info = d;
            dataMap[d.parentId].child[d.id] = dataMap.take(d.id);
            ptrMap.insert(d.parentId, &dataMap[d.parentId]);
            continue;
        }
        //父节点不存在 并且 子节点不存在
        dataMap[d.parentId].child[d.id].info = d;
        ptrMap.insert(d.parentId, &dataMap[d.parentId]);
        ptrMap.insert(d.id, &dataMap[d.parentId].child[d.id]);
    }

    QTreeView view;
    QStandardItemModel *model = new QStandardItemModel;
    view.setModel(model);
    view.header()->hide();
    auto root = model->invisibleRootItem();
    root->appendRow(new QStandardItem("root"));
    root = root->child(0);

    print(dataMap);
    fillTree(dataMap, root);
    view.expandAll();
    view.show();

    return a.exec();
}