Using QFileSystemModel, QTreeView, and QSortFilterProxyModel

Zbigniew-Sch

I wrote a small program and I'm having the same problem.
This is definitely a bug in Qt, without QSortFilterProxyModel, everything works correctly.
I renamed the directory in my program and deleted a file from that directory
using Windows Explorer – it works correctly now. I'm out of ideas.

jeremy_k

The general advice from this thread remains valid:

The existence of a test program doesn't help confirm or deny if nobody else can see the program.
Bug reports can be filed at https://bugreports.qt.io/. Chances are high that whoever responds will also ask for a demonstrator.

Christian Ehrlicher

@jeremy_k said in Using QFileSystemModel, QTreeView, and QSortFilterProxyModel:

Chances are high that whoever responds will also ask for a demonstrator.

Higher than high - otherwise it will be closed sooner or later with 'Needs more information'

Zbigniew-Sch

How can I upload an entire example project as a ZIP file?

JonB

@Zbigniew-Sch
People don't like looking at external and zip files. The forum does not offer this. We don't need a project for this issue.

People are expecting a minimal reproducible example. Like a hundred lines. Stripped of anything and everything not required to show the behaviour, which you spend time doing. You have @jeremy_k's starting point code earlier in 20-odd lines. How much do you need to add to that to show it goes wrong for you?

Zbigniew-Sch

Here is my example program to reproduce the problem:

Header of QMainWindow:

class LZImageViewerTest : public QMainWindow
{
    Q_OBJECT

public:
    LZImageViewerTest(QWidget *parent = nullptr);
    ~LZImageViewerTest();

    QLZFileSystemModel *pcoGetFileSystemModel() { return m_pcoFileSystemModel; };
    QSortFilterProxyModel *pcoSortFilterProxyModel() { return m_pcoSortFilterProxyModel;}

    static LZImageViewerTest* pcoGetMainWindow() { return m_stMainWindow; }

    static LZImageViewerTest* m_stMainWindow;

private:
    Ui::LZImageViewerTestClass ui;

    QModelIndex m_coRootModelIndex;
    QLZTreeView *m_pcoTreeView;
    QHBoxLayout *m_pcoMainLayout;
    QLZMainWidget *m_pcoMainWidget;
    QLZFileSystemModel *m_pcoFileSystemModel;
    QSortFilterProxyModel *m_pcoSortFilterProxyModel;
};

QMainWindow cpp file:

LZImageViewerTest *LZImageViewerTest::m_stMainWindow = nullptr;

LZImageViewerTest::LZImageViewerTest(QWidget *parent)
    : QMainWindow(parent)
{
    ui.setupUi(this);

    m_stMainWindow = this;
    QScreen* pcoScreen = QGuiApplication::primaryScreen();
    QRect coScreenGeometry = pcoScreen->geometry();
    resize(QSize(coScreenGeometry.width() - 1400, coScreenGeometry.height() - 600));

    // Center main window 
    QRect mainFrameViewRect = frameGeometry();
    QPoint centerPoint = screen()->availableGeometry().center();

    mainFrameViewRect.moveCenter(centerPoint);
    move(mainFrameViewRect.topLeft());

    m_pcoTreeView = new QLZTreeView();
    m_pcoFileSystemModel = new QLZFileSystemModel();
    m_coRootModelIndex= m_pcoFileSystemModel->setRootPath("D:\\Test");

    m_pcoSortFilterProxyModel = new QSortFilterProxyModel();
    m_pcoSortFilterProxyModel->setSourceModel(m_pcoFileSystemModel);
    m_pcoSortFilterProxyModel->setFilterCaseSensitivity(Qt::CaseInsensitive);
    m_pcoSortFilterProxyModel->setSortCaseSensitivity(Qt::CaseInsensitive);

    m_pcoTreeView->setModel(m_pcoSortFilterProxyModel);
    m_pcoTreeView->setRootIndex(m_pcoSortFilterProxyModel->mapFromSource(m_coRootModelIndex));

    m_pcoMainWidget = new QLZMainWidget(this);
    m_pcoMainWidget->setContentsMargins(3, 4, 4, 4);
    m_pcoMainLayout = new QHBoxLayout(this);

    m_pcoMainLayout->addWidget(m_pcoTreeView);
    m_pcoMainWidget->setLayout(m_pcoMainLayout);
    setCentralWidget(m_pcoMainWidget);
}

LZImageViewerTest::~LZImageViewer
{}

QLZFileSystemModel cpp file:


QLZFileSystemModel::QLZFileSystemModel(QObject* parent)
    : QFileSystemModel(parent)
{

}

Qt::ItemFlags QLZFileSystemModel::flags(const QModelIndex& index) const
{
    Qt::ItemFlags flags = QFileSystemModel::flags(index);
    flags |= Qt::ItemIsEditable | Qt::ItemIsEnabled | Qt::ItemIsSelectable;
    return flags;
}

QLZFileSystemModel::~QLZFileSystemModel()
{
}

QLZTreeView cpp file:

QLZTreeView::QLZTreeView(QWidget* parent): QTreeView(parent)
{
	setContextMenuPolicy(Qt::CustomContextMenu);
	connect(this, &QWidget::customContextMenuRequested, this, &QLZTreeView::customContextMenu);
}

QLZTreeView::~QLZTreeView()
{
}

void QLZTreeView::customContextMenu(const QPoint& point)
{
	QMenu coContextMenu;
	QModelIndex coCurrentIndex = currentIndex();

	if (!coCurrentIndex.isValid())
		return;

	QAction* pcoRenameObjectsAction = coContextMenu.addAction(tr("Rename"));
	connect(pcoRenameObjectsAction, &QAction::triggered, this, [this, coCurrentIndex] { renameCurrentObject(coCurrentIndex); });

	QAction* pcoDeleteObjectsAction = coContextMenu.addAction(tr("Delete"));
	connect(pcoDeleteObjectsAction, &QAction::triggered, this, [this, coCurrentIndex] { deleteCurrentObject(coCurrentIndex); });

	coContextMenu.exec(viewport()->mapToGlobal(point));

	QList<QAction*> coActionsList = coContextMenu.actions();
	foreach(QAction * pcoAction, coActionsList)
		delete pcoAction;
}

void QLZTreeView::renameCurrentObject(QModelIndex coCurrentIndex)
{
	if (!coCurrentIndex.isValid())
		return;

	int iCurrentRow = coCurrentIndex.column();
	if (iCurrentRow != 0)
		return;

	edit(currentIndex());

	QList<QLineEdit*> coEditorList = findChildren<QLineEdit*>();
	if (coEditorList.size() == 0)
		return;

	coEditorList[0]->installEventFilter(this);
	coEditorList[0]->setAlignment(Qt::AlignCenter);
}

void QLZTreeView::closeEditor(QWidget* coEditor, QAbstractItemDelegate::EndEditHint hint)
{
	QSortFilterProxyModel* pcoSortFilterProxyModel = LZImageViewerTest::pcoGetMainWindow()->pcoSortFilterProxyModel();
	pcoSortFilterProxyModel->invalidate();
	QTreeView::closeEditor(coEditor, hint);
}

void QLZTreeView::deleteCurrentObject(QModelIndex coCurrentIndex)
{
	if (!coCurrentIndex.isValid())
		return;

	int iCurrentRow = coCurrentIndex.column();
	if (iCurrentRow != 0)
		return;

	QList<QString> coSelectedIndexesPathList;
	QModelIndexList coIndexesList = selectedIndexes();
	QFileSystemModel *pcoFileSystemModel = LZImageViewerTest::pcoGetMainWindow()->pcoGetFileSystemModel();
	QSortFilterProxyModel *pcoSortFilterProxyModel = LZImageViewerTest::pcoGetMainWindow()->pcoSortFilterProxyModel();

	for (int i = 0; i < coIndexesList.size(); i++)
	{
		if (coIndexesList[i].column() == 0)
		{
                        // Delete file using "QFile::moveToTrash()"
			//QString coSelectedObjectPath = pcoFileSystemModel->filePath(pcoSortFilterProxyModel->mapToSource(coIndexesList[i]));
			//bool bRes = QFile::moveToTrash(coSelectedObjectPath);
                       
                        // Delete file using "pcoFileSystemModel->remove()"
			bool bRes = pcoFileSystemModel->remove(pcoSortFilterProxyModel->mapToSource(coIndexesList[i]));
			pcoSortFilterProxyModel->invalidate();
		}
	}
}

Christian Ehrlicher

This is to much. No need for an ui file , no context menu stuff and other stuff.

Zbigniew-Sch

Sorry, I don't understand you. This is a minimal example to reproduce the problem.
If I completely reduce the source code, you won't see the dependencies and you won't be able to reproduce the problem.

Christian Ehrlicher

If you can't provide a real mre then I am out, sorry.

Zbigniew-Sch

Does nobody have any suggestions as to what the error could be, or is this actually a Qt bug?

JonB

@Zbigniew-Sch said in Using QFileSystemModel, QTreeView, and QSortFilterProxyModel:

I'm using Windows 11 and Qt 6.10. I think this is a bug, or does anyone have a solution?

Is there any chance what you are seeing using 6.10 turns out to be caused by https://forum.qt.io/topic/164009/qsortfilterproxy-sorting-works-on-linux-but-fails-on-windows/6 and https://qt-project.atlassian.net/browse/QTBUG-141830 ? But I think that only occurs when using a static build? Yours isn't a static build is it?

Zbigniew-Sch

I am using Qt 6.10.1 under Windows 11
Static build - NO

GrecKo

@Zbigniew-Sch said in Using QFileSystemModel, QTreeView, and QSortFilterProxyModel:

Sorry, I don't understand you. This is a minimal example to reproduce the problem.
If I completely reduce the source code, you won't see the dependencies and you won't be able to reproduce the problem.

This is not a minimal reproducible example.

Reduce it until there's only what is needed to reproduce the issue and nothing more.
It is also not usable for us because we can't run it.
Ideally it should be a self contained main.cpp with a couple of embedded classes if needed.

No UI, just a QTreeView, a QSortFilterProxyModel and your model class.

Doing that will not only help us helping you but will also allow you to isolate the issue and most of the time figure out what it is and solve it by yourself.

This is most likely not a Qt bug but something coming from your code.

Zbigniew-Sch

QLZTreeView - see above
Header:

class QLZTreeView : public QTreeView
{
	Q_OBJECT

public:

	explicit QLZTreeView(QWidget* parent = nullptr);
	~QLZTreeView();

protected:
	void renameCurrentObject(QModelIndex coCurrentIndex);
	void deleteCurrentObject(QModelIndex coCurrentIndex);
	void closeEditor(QWidget* editor, QAbstractItemDelegate::EndEditHint hint) override;

private slots:
	void customContextMenu(const QPoint& point);
};

QSortFilterProxyModel - is standard Qt class

QLZFileSystemModel - see above
Header:

  class QLZFileSystemModel : public QFileSystemModel
 {
 Q_OBJECT

 public:
 explicit QLZFileSystemModel(QObject* parent = nullptr);
 ~QLZFileSystemModel();

 protected:
 Qt::ItemFlags flags(const QModelIndex& index) const override;

};

main.cpp - and that's all.

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    LZImageViewerTest window;
    window.show();
    return app.exec();
}