Proxy for the QFileSystemModel

[stereomatching]

[code]
#include <QtCore>
#include <QtGui>

class busyProxy : public QSortFilterProxyModel
{
Q_OBJECT
public:
explicit busyProxy(QObject *parent = 0) : QSortFilterProxyModel(parent) {}

bool filterAcceptsRow(int source_row, const QModelIndex &source_parent) const
{
    QModelIndex index = sourceModel()->index(source_row, 0, source_parent);        
    QString const &text = sourceModel()->data(index).toString();
    //the folder "very big" contains a lot of jpg, and I only want
    //to show one of it which name "kkk0.jpg"        
    if(text == "kkk0.jpg" || text == "kkk1000.jpg" || text == "kkk10.jpg") return true;
    
    if(text == "very big") return true;              

    return false;
}

bool lessThan(const QModelIndex &left, const QModelIndex &right) const
 {
     QString const leftString = sourceModel()->data(left).toString();
     QString const rightString = sourceModel()->data(right).toString();

     qDebug() << leftString << ", " << rightString;

     return leftString > rightString;
 }

};

//Do nothing, only want to compare with the busyProxy
class lazyProxy : public QSortFilterProxyModel
{
Q_OBJECT
public:
explicit lazyProxy(QObject *parent = 0) : QSortFilterProxyModel(parent) {}
};

class testProxyFiles : public QWidget
{
public:
testProxyFiles()
{
QFileSystemModel *model = new QFileSystemModel(this);

    lazyProxy *lazyPro = new lazyProxy(this);
    lazyPro->setSourceModel(model);

    QTableView *sourceView = new QTableView(this);
    sourceView->setModel(lazyPro);
    QString const rootPath = "E:/file_test/very big";
    sourceView->setRootIndex(lazyPro->mapFromSource(model->setRootPath(rootPath)));

    QTableView *proxyView = new QTableView(this);
    busyProxy *busyPro = new busyProxy(this);
    busyPro->setSourceModel(model);
    proxyView->setModel(busyPro);
    proxyView->setRootIndex(busyPro->mapFromSource(model->setRootPath(rootPath)));

    QHBoxLayout *layout = new QHBoxLayout(this);
    layout->addWidget(sourceView);
    layout->addWidget(proxyView);

    setLayout(layout);
}    

};

inline int proxyFiles(QApplication &app)
{
testProxyFiles proxy;
proxy.show();

return app.exec();

}

int main( int argc, char **argv )
{
QApplication app( argc, argv );

proxyFiles(app);

return 0;
}
[/code]

I have several questions :
1 : On line 16~18, do I have other solution to filter out the item of the QFileSystemModel?
The QFileSystemModel would navigate the root first, if I don't return true when the text
equal to "very big", the proxy wouldn't navigate the files inside "very big"

2 : when I show the item by busyProxy or lazyProxy, the indexes on the leftside are weird, how could
I edit them?When I set the QFileSystemModel as the model of QtableView, the indexes looks fine.

3 : the lessThan function never print anything, but why?

4 : Do you have any easy examples for the proxy of QFileSystemModel? I can't find a topic
talk about how to design a proxy for QFileSystemModel

Thanks a lot

[stereomatching]

Besides, how could I ask the view to display all of the drives(win7)?
[code]
sourceView->setRootIndex(lazyPro->mapFromSource(model->setRootPath(rootPath)));
[/code]

What kind of path should I set at the "setRootPath" function?Thanks

[andre]

[quote author="stereomatching" date="1343302015"]Besides, how could I ask the view to display all of the drives(win7)?
[code]
sourceView->setRootIndex(lazyPro->mapFromSource(model->setRootPath(rootPath)));
[/code]

What kind of path should I set at the "setRootPath" function?Thanks[/quote]

Setting an empty path works for me.

[stereomatching]

Thanks, setting an empty path also work for me.

[domzique]

Hi stereoMatching,
Did you find a way the filtred files ?

I am pulling my hair for a week to find a way to display with a treeview and qfilesystemmodel and a SFPModel...

And I agree with you => 4 : Do you have any easy examples for the proxy of QFileSystemModel? I can’t find a topic talk about how to design a proxy for QFileSystemModel

there is no exemples to use, in my case, a QfilesystemModel + treeview + SFPM to filter dirs only and/or files

[stereomatching]

Sort of, but I have to design many filters to meet my requirement.
I think I would choose custom widget to solve my problem in
the future.

Currently I am using two QDirModel to design my app, because
QFileSystemModel(maybe)has some bug and design a lot of proxy
will make my codes become harder to maintain.
"bug of QFileSystemModel?":http://qt-project.org/forums/viewthread/19168/

@
#ifndef PROXYTEST2_HPP
#define PROXYTEST2_HPP

#include <QtCore>
#include <QtGui>

class fileProxy : public QSortFilterProxyModel
{
Q_OBJECT

public:
explicit fileProxy(QObject *parent = 0) : QSortFilterProxyModel(parent) {}
QString currentAbsPath_;

protected:
virtual bool filterAcceptsRow(int source_row, const QModelIndex &source_parent) const
{
QModelIndex index = sourceModel()->index(source_row, 0, source_parent);
QDirModel* filemodel = qobject_cast<QDirModel*>(sourceModel());
QFileInfo info = filemodel->fileInfo(index);
if(info.absolutePath() != currentAbsPath_)
{
return true;
}

    /*
    //filter files
    if(info.isFile() && info.absolutePath() == currentAbsPath_)
    {
        return false;
    }*/

    //filter directories, you must add info.absolutePath() != info.absoluteFilePath() to prevent
    //the filter filter out the absolutePath
    if(info.isDir() && info.absolutePath() != info.absoluteFilePath() && info.absolutePath() == currentAbsPath_)
    {
        return false;
    }

    return true;
}

};

class Proxy2 : public QWidget
{
Q_OBJECT

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

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

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

    treeView_ = new QTreeView(this);
    treeView_->setModel(normalProxy_);
    connect(treeView_, SIGNAL(clicked(QModelIndex)), this, SLOT(changeTableRootIndex(QModelIndex)));

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

    fileBox_ = new QCheckBox(this);
    fileBox_->setText("file");
    connect(fileBox_, SIGNAL(clicked(bool)), this, SLOT(changeProxy(bool)));

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

    setLayout(layout);
}

private slots:
//if you need different criteria to filter out the files,
//you have to change the proxy dynamically
void changeProxy(bool enable)
{
if(enable)
{
QModelIndex index = treeView_->currentIndex();
proxy_->currentAbsPath_ = model_->fileInfo(normalProxy_->mapToSource(index) ).absolutePath();

        tableView_->setModel(proxy_);
        changeTableRootIndex(index);
    }
    else
    {
        tableView_->setModel(normalProxy_);
        changeTableRootIndex(treeView_->currentIndex() );
    }
}

void changeTableRootIndex(QModelIndex const &index)
{
    if(fileBox_->isChecked())
    {
        QModelIndex sourceIndex = normalProxy_->mapToSource(index);
        tableView_->setRootIndex(proxy_->mapFromSource(sourceIndex));
    }
    else
        tableView_->setRootIndex(index);
}

private:
QDirModel *model_;
QSortFilterProxyModel *normalProxy_;
fileProxy *proxy_;
QTableView *tableView_;
QTreeView *treeView_;
QCheckBox *fileBox_;
};

//I am lazy to separate declaration and implement, so I inline it
inline int testProxy2(QApplication &app)
{
Proxy2 p2;
p2.show();

return app.exec();

}

#endif // PROXYTEST2_HPP

@

The codes are pretty messy and full of poor coding style
it is just for experiment, only show you how to filter the
files.

[stereomatching]

The view(?) will traverse the treemodel recursively
Assume there are a path "E:/D/C/B/A"
if you return false when the path is "E:/"
All of the path will be filter out(D/C/B/A)

Using this filter is not a good solution for my app,
so I give up already and turn my target to custom widget,
ch6 of "advanced Qt programming" teach you how to do that.
Design a customize QWidget to display the model data is pretty cumbersome.

Frankly speaking, current model/view architecture is pretty
complicated, especially when you want to deal with treeModel.

[domzique]

Hi stereoMatching,
Thank you very much for sharing your code and for your help.
I will test your code and try to obtain what I want, but I think I will leave the treeview to another type of view with which I am comfortable.

I thought It will be a good idea to use it for a file managing part of my soft, but I am wasting a lot of my time to just find a way to do some few simple thinks.

Best regards.
DomZique.

[stereomatching]

I share your pain, me also spend a lot of times to figure out how to implement the filter for treemodel
Filter of tableModel is easy and straight forward, but treemodel is like a black box for me,
I study three books and document but none of them talk about it.