QDirModel+QTreeView and checkable items

I'm trying to implement QTreeView + QDirModel with checkable items. I have found topic with similar problem, I've derived new class from QDirModel but I don't get how to reimplement flags() and data() methods to have needed functionality. Can somebody help?

Quote:

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Originally Posted by L.Marvell

I'm trying to implement QTreeView + QDirModel with checkable items. I have found topic with similar problem, I've derived new class from QDirModel but I don't get how to reimplement flags() and data() methods to have needed functionality. Can somebody help?

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checkable dir & file...

A Context menu can run ... on file & dir.... like other file explorer ...

Code:

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void User_File::Load_Connector()
{
    startnow = QDir::currentPath();
    dirsizebite = 0;
    dirandfile.clear();
    qtcpeed = true;
    modeluser = new QDirModel;
    modellocal = new QDirModel;
    setAcceptDrops(true);
    modellocal->setResolveSymlinks(false);
    modeluser->setResolveSymlinks(false);
    usertree->setModel(modeluser);
    mlocal->setModel(modellocal);
 
    modeluser->setSupportedDragActions(Qt::CopyAction);
    modellocal->setSupportedDragActions(Qt::CopyAction);
    usertree->setDragEnabled(true);
    mlocal->setDragEnabled(true);
 
    mlocal->setRootIndex(modellocal->index(lstart));
    usertree->setRootIndex(modeluser->index(ustart));
    connect(usertree, SIGNAL(clicked(const QModelIndex &)),this, SLOT(GlobalContextU(const QModelIndex&)));
    connect(mlocal, SIGNAL(clicked(const QModelIndex &)),this, SLOT(OpenLocalFile(const QModelIndex&)));
    connect(pushButton, SIGNAL(clicked()),this, SLOT(ResetDBDir()));
 
 
 
 
 
    usertree->resizeColumnToContents (0);
    mlocal->resizeColumnToContents (0);
    IndexDir(ustart);
    qDebug() << "### dirsizebite " << dirsizebite;
 
 
    dirowerflow = false;
 
    if (dirsizebite > MAXDIRSIZE) {
    dirowerflow = true;
     QMessageBox::warning(this, tr("User dir."),tr("The maxiumum capacity of user dir is %1!").arg(BiteorMega(MAXDIRSIZE)));
    }
    label_2->setText(tr("User Dir size %1 - %2 ")
    .arg(BiteorMega(dirsizebite))
    .arg(UmanTimeFromUnix(QTime_Null())));
    dirandfile.clear();
 
 
    Q_ASSERT(qtcpeed);
    qtcpeed = false;
 
}
 
 
void User_File::GlobalContextU( const QModelIndex &index )
{
    if (!index.isValid()) {
      return;  
    }
    ResetDD();
    userselect = true;
    acc = true;
    const QString filepath = modeluser->filePath(index);
    fi = QFileInfo(filepath);
    last = QCursor::pos();
    /* model to fast! */
    QTimer::singleShot(200, this, SLOT(User_Context()));  
}
 
 
void User_File::User_Context()
{
        TContext = new QMenu(this);
        QString wat = fi.absoluteFilePath(); 
        QDir checkdir(wat);
        dir = checkdir.exists();
        if (dir) {
        TContext->addAction(tr( "Delete dir \"%1\" " ).arg(fi.fileName()), this , SLOT( DDrm() ) );
        TContext->addAction(tr( "Open dir \"%1\" " ).arg(fi.fileName()), this , SLOT( DDop() ) );  
        } else {
        TContext->addAction(tr( "Delete file \"%1\" " ).arg(fi.fileName()), this , SLOT( DDrm() ) );
        TContext->addAction(tr( "Open file \"%1\" " ).arg(fi.fileName()), this , SLOT( DDop() ) );
        }
        TContext->addAction(tr( "New Dir here" ), this , SLOT( DDmkdir() ) );
        TContext->addAction(tr( "Reload ..." ), this , SLOT( Load_Connector() ) );
        TContext->addAction(tr( "User dir Close contex" ), TContext , SLOT( close() ) );
        TContext->exec(last);
 
}

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It seems you didn't understand me (or maybe I don't understand something...). I need QTreeView with tree of directories and each has checkbox near (with flag Qt::ItemIsUserCheckable). I think new class has to be derived from QDirModel with flags(), data() and maybe some other methods reimplemented, but I don't get how to do it. Need some example.

Quote:

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Originally Posted by L.Marvell

I think new class has to be derived from QDirModel with flags(), data() and maybe some other methods reimplemented, but I don't get how to do it. Need some example.

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Yes, that's right. You need to reimplement flags(), data() and setData(). flags() should indeed return Qt::ItemIsUserCheckable amongst the other flags, data() should return a valid value for Qt::CheckStateRole and setData() should store the passed value for Qt::CheckStateRole. The toughest part is to implement a data structure of some kind for storing the check states as QDirModel is not able to store them for you.

Quote:

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Originally Posted by jpn

The toughest part is to implement a data structure of some kind for storing the check states as QDirModel is not able to store them for you.

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I suggest QSet<QString> where the key is the FilePathRole (defined in QDirModel). The only trick is to update the contents if the dir model changes (i.e. file gets deleted). If a path is in the set, it is checked.

Quote:

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Originally Posted by jpn

Yes, that's right. You need to reimplement flags(), data() and setData(). flags() should indeed return Qt::ItemIsUserCheckable amongst the other flags, data() should return a valid value for Qt::CheckStateRole and setData() should store the passed value for Qt::CheckStateRole. The toughest part is to implement a data structure of some kind for storing the check states as QDirModel is not able to store them for you.

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That's the point. I can't get how should data() look like and what should it return. It seems I need to read Assistant again and again about Models...

Code:

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class MyDirModel : public QDirModel
{
	...
 
private:
	QSet<QString> checked; // wysota's suggestion
}
 
Qt::ItemFlags MyDirModel::flags(const QModelIndex& index) const
{
	Qt::ItemFlags f = QDirModel::flags(index);
	if (index.column() == 0) // make the first column checkable
		f |= Qt::ItemIsUserCheckable;
	return f;
}
 
QVariant MyDirModel::data(const QModelIndex& index, int role = Qt::DisplayRole) const
{
	if (index.isValid() && index.column() == 0 && role == Qt::CheckStateRole)
	{
		// the item is checked only if we have stored its path
		return (checked.contains(filePath(index)) ? Qt::Checked : Qt::Unchecked);
	}
	return QDirModel::data(index, role);
}
 
bool MyDirModel::setData(const QModelIndex& index, const QVariant& value, int role = Qt::EditRole)
{
	if (index.isValid() && index.column() == 0 && role == Qt::CheckStateRole)
	{
		// store checked paths, remove unchecked paths
		if (value.toInt() == Qt::Checked)
			checked.insert(filePath(index));
		else
			checked.remove(filePath(index));
		return true;
	}
	return QDirModel::setData(index, value, role);
}

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Great thanks man! I'll try it surely.