Weird behavior when filter QFileSystemModel by proxy

[stereoMatching]

#include <QtCore>
#include <QtGui>
 
class fileProxy : public QSortFilterProxyModel
{
    Q_OBJECT
 
public:
    explicit fileProxy(QObject *parent = 0) : QSortFilterProxyModel(parent), selectDirs_(true), selectFiles_(true) {}
 
public slots:
    void setSelectDirs(bool enable) { selectDirs_ = enable; }
    void setSelectFiles(bool enable) { selectFiles_ = enable; }
 
protected:
    bool filterAcceptsRow(int source_row, const QModelIndex &source_parent) const
    {
        QModelIndex index = sourceModel()->index(source_row, 0, source_parent);
        QFileSystemModel *source = static_cast<QFileSystemModel*>(sourceModel());
        QFileInfo info = source->fileInfo(index);
 
        if(info.isDir() && selectDirs_) return true;
 
        if(info.isFile()  &&  selectFiles_) return true;
 
        return false;
    }
 
private:
    bool selectDirs_;
    bool selectFiles_;
 
};
 
class Proxy2 : public QWidget
{
    Q_OBJECT
 
public:
    Proxy2()
    {
        model_ = new QFileSystemModel(this);
 
        normalProxy_ = new QSortFilterProxyModel(this);
        normalProxy_->setSourceModel(model_);
 
        proxy_ = new fileProxy(this);
        proxy_->setSourceModel(model_);
 
        treeView_ = new QTreeView(this);
        treeView_->setModel(normalProxy_);
        treeView_->setRootIndex(normalProxy_->mapFromSource(model_->setRootPath("")));
 
        tableView_ = new QTableView(this);
        tableView_->setModel(proxy_);
 
        connect(treeView_, SIGNAL(clicked(QModelIndex)), this, SLOT(changeTableRootIndex(QModelIndex)));
 
        QCheckBox *dirBox = new QCheckBox(this);
        QCheckBox *fileBox = new QCheckBox(this);
 
        dirBox->setText("Dir");
        fileBox->setText("file");
        dirBox->setCheckState(Qt::Checked);
        fileBox->setCheckState(Qt::Checked);
        connect(dirBox, SIGNAL(clicked(bool)), proxy_, SLOT(setSelectDirs(bool)));
        connect(fileBox, SIGNAL(clicked(bool)), proxy_, SLOT(setSelectFiles(bool)));
 
        QHBoxLayout *layout = new QHBoxLayout(this);
        layout->addWidget(treeView_);
        layout->addWidget(tableView_);
        layout->addWidget(dirBox);
        layout->addWidget(fileBox);
 
        setLayout(layout);
    }
 
public slots:
    void changeTableRootIndex(QModelIndex const &index)
    {
        QModelIndex sourceIndex = normalProxy_->mapToSource(index);
        tableView_->setRootIndex(proxy_->mapFromSource(sourceIndex));
    }
 
private:
    QFileSystemModel *model_;
    QSortFilterProxyModel *normalProxy_;
    fileProxy *proxy_;
    QTableView *tableView_;
    QTreeView *treeView_;
};
 
inline int testProxy2(QApplication &app)
{
    Proxy2 p2;
    p2.show();
 
    return app.exec();
}

#include <QtCore>
#include <QtGui>

class fileProxy : public QSortFilterProxyModel
{
    Q_OBJECT

public:
    explicit fileProxy(QObject *parent = 0) : QSortFilterProxyModel(parent), selectDirs_(true), selectFiles_(true) {}

public slots:
    void setSelectDirs(bool enable) { selectDirs_ = enable; }
    void setSelectFiles(bool enable) { selectFiles_ = enable; }

protected:
    bool filterAcceptsRow(int source_row, const QModelIndex &source_parent) const
    {
        QModelIndex index = sourceModel()->index(source_row, 0, source_parent);
        QFileSystemModel *source = static_cast<QFileSystemModel*>(sourceModel());
        QFileInfo info = source->fileInfo(index);

        if(info.isDir() && selectDirs_) return true;

        if(info.isFile()  &&  selectFiles_) return true;

        return false;
    }

private:
    bool selectDirs_;
    bool selectFiles_;

};

class Proxy2 : public QWidget
{
    Q_OBJECT

public:
    Proxy2()
    {
        model_ = new QFileSystemModel(this);

        normalProxy_ = new QSortFilterProxyModel(this);
        normalProxy_->setSourceModel(model_);

        proxy_ = new fileProxy(this);
        proxy_->setSourceModel(model_);

        treeView_ = new QTreeView(this);
        treeView_->setModel(normalProxy_);
        treeView_->setRootIndex(normalProxy_->mapFromSource(model_->setRootPath("")));

        tableView_ = new QTableView(this);
        tableView_->setModel(proxy_);

        connect(treeView_, SIGNAL(clicked(QModelIndex)), this, SLOT(changeTableRootIndex(QModelIndex)));

        QCheckBox *dirBox = new QCheckBox(this);
        QCheckBox *fileBox = new QCheckBox(this);

        dirBox->setText("Dir");
        fileBox->setText("file");
        dirBox->setCheckState(Qt::Checked);
        fileBox->setCheckState(Qt::Checked);
        connect(dirBox, SIGNAL(clicked(bool)), proxy_, SLOT(setSelectDirs(bool)));
        connect(fileBox, SIGNAL(clicked(bool)), proxy_, SLOT(setSelectFiles(bool)));

        QHBoxLayout *layout = new QHBoxLayout(this);
        layout->addWidget(treeView_);
        layout->addWidget(tableView_);
        layout->addWidget(dirBox);
        layout->addWidget(fileBox);

        setLayout(layout);
    }

public slots:
    void changeTableRootIndex(QModelIndex const &index)
    {
        QModelIndex sourceIndex = normalProxy_->mapToSource(index);
        tableView_->setRootIndex(proxy_->mapFromSource(sourceIndex));
    }

private:
    QFileSystemModel *model_;
    QSortFilterProxyModel *normalProxy_;
    fileProxy *proxy_;
    QTableView *tableView_;
    QTreeView *treeView_;
};

inline int testProxy2(QApplication &app)
{
    Proxy2 p2;
    p2.show();

    return app.exec();
}

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I hope the fileProxy will filter the files according to the checkstate of the check box
But the results are pretty weird

1 : It would not filter out the files or directories instantly, I have to switch between different directories or drives
of the treeView
2 : Even I did switch the directories or drives, there is no guarantee the fileProxy will filter out the directories or
files

What kind of mistakes do I make?
Thanks a lot

---

Added after 4 minutes:

I narrow the problem a little bit
If I remove line 22, neglect all of the check box and change the codes to

if(info.isFile()  &&  selectFiles_) return true;

if(info.isFile()  &&  selectFiles_) return true;

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The TableView will never show anything
How could I show the files(only files)to the users?
Thanks a lot