main.cpp

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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
 
#include <QtGui>
#include <QApplication>
#include <QSortFilterProxyModel>
 
class MyItemModel : public QStandardItemModel
{
public:
    MyItemModel(QWidget *parent = nullptr);
};
 
MyItemModel::MyItemModel(QWidget *parent)
    : QStandardItemModel(parent)
{};
 
class Widget : public QWidget
{
public:
    Widget(QWidget *parent = nullptr);
};
 
Widget::Widget(QWidget *parent)
    : QWidget(parent)
{
        QTreeView *treeView = new QTreeView;
        MyItemModel *model = new MyItemModel(this);
 
        treeView->setModel(model);
 
        MyItemModel *sourceModel = new MyItemModel(this);
        QSortFilterProxyModel *proxyModel = new QSortFilterProxyModel(this);
 
        proxyModel->setSourceModel(sourceModel);
        treeView->setModel(proxyModel);
 
        treeView->setSortingEnabled(true);
 
        proxyModel->sort(2, Qt::AscendingOrder);
        proxyModel->setFilterRegularExpression(QRegularExpression("\.png", QRegularExpression::CaseInsensitiveOption));
        proxyModel->setFilterKeyColumn(1);
}
 
int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    Widget widget;
    widget.show();
    return app.exec();
}