本周技术概要20231016-20231022与生活点滴

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#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QModelIndex>
#include <QTreeView>

QT_BEGIN_NAMESPACE
class QTreeView; //forward declarations
class QStandardItemModel;
class QStandardItem;
class QTimer;

QT_END_NAMESPACE


class MainWindow : public QMainWindow
{
    Q_OBJECT

private slots:
    void slot_valueIncrease();
    void slot_modelIndex(QModelIndex index);

private:
    QTreeView *treeView;

    QTreeView TreeView;

    QStandardItemModel *standardModel;
    QList<QStandardItem *> prepareRow(const QString &first) const;

    QTimer *timer_;
    int count{0};

    QStandardItem *root_;
    QStandardItem *first_;
    QStandardItem *second_;


public:
    MainWindow(QWidget *parent = nullptr);
};

#endif // MAINWINDOW_H

    root_ = new QStandardItem("root");
    first_ = new QStandardItem("first");
    second_ = new QStandardItem("second");

    first_->appendRow(second_);
    root_->appendRow(first_);
定时器溢出后：
    treeView->setCurrentIndex(first_->index());
    treeView->setCurrentIndex(second_->index());