How to show custom widget (QFileDialog with QLineEdit) in TreeView's cell

[WTMapot]

Hi All

I have a custom widget named named FileSelector made up of a toolbutton and QlineEdit. I want this widget to display inside a tableview for a user to select a file using Qfiledialog. The file dialog is triggered by the toolbutton using the static function QFileDialog::getOpenFileNames. I have created the table view and all works well. I can select the file and it displays in the tableview.The problem is when I click close or accept on the tableview the application crashes....Any help would be appreciated.

@/// File selector class widget for opening files from a directory

class FileSelector : public QWidget
{
Q_OBJECT

public:

/// Constructor
FileSelector(QWidget *parent = 0);

/// Destructor
virtual ~FileSelector();

QToolButton *m_tbutton;

QLineEdit *m_edit;


QString getFile();

//Parameter *parameter;

//void setParamValue(QString &text){parameter->value = text.toStdString();}

signals:

void getFileName(QLineEdit *);

public slots:

/// Function to open a file from a directory
void selectFile();

void setParamValue(const QString &);

protected:

//QFileDialog *filedialog;

private:

};@

@FileSelector::FileSelector(QWidget *parent) : QWidget(parent)
{
//ctor
//parameter = param;
m_tbutton = new QToolButton(this);
m_tbutton->setFocusPolicy(Qt::StrongFocus);
m_edit = new QLineEdit(this);
//filedialog = new QFileDialog(0);

QHBoxLayout *hb = new QHBoxLayout();
hb->setContentsMargins(0, 0, 0, 0);
hb->setSpacing(0);
hb->addWidget(m_edit);
hb->addWidget(m_tbutton);
setLayout(hb);

connect(m_tbutton, SIGNAL(clicked()), this, SLOT(selectFile()));
//connect(m_edit, SIGNAL(textChanged(const QString &)), this, SLOT(setParamValue(const QString &)));

}

FileSelector::~FileSelector()
{
//dtor
}

void FileSelector::selectFile()
{
//emit getFileName(m_edit);
QString fileName = QFileDialog::getOpenFileName(this, tr("Open File"), " ", tr("Files (*.tif)"));
//if(!fileName.isEmpty())
//{
//m_edit->setText(fileName);
//}
//cout << fileName.toStdString() << " [[[" << endl;
//item->setText(fileName);
}

QString FileSelector::getFile()
{
//return QFileDialog::getOpenFileName(0, tr("Open File"), " ", tr("Files (*.tif)"));
}

void FileSelector::setParamValue(const QString &text)
{
//parameter->value = text.toStdString();
//cout << text.toStdString() << " : " << endl;
}@

@class FileSelectorDelegate : public QItemDelegate
{
Q_OBJECT

public:

FileSelectorDelegate(QObject *parent = 0);

virtual ~FileSelectorDelegate(){};

QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &option,const QModelIndex &index) const;

void setEditorData(QWidget *editor, const QModelIndex &index) const;

void setModelData(QWidget *editor, QAbstractItemModel *model,const QModelIndex &index) const;

void updateEditorGeometry(QWidget *editor,const QStyleOptionViewItem &option, const QModelIndex &index) const;

//void paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const;

protected:

private:

};
@

@#include "fileselectordelegate.h"

FileSelectorDelegate::FileSelectorDelegate(QObject *parent): QItemDelegate(parent)
{

}

QWidget *FileSelectorDelegate::createEditor(QWidget parent,const QStyleOptionViewItem &/ option /,const QModelIndex &/ index */) const
{
FileSelector *editor = new FileSelector(parent);
editor->m_edit->setText("Open File");

return editor;

}

void FileSelectorDelegate::setEditorData(QWidget *editor,const QModelIndex &index) const
{
QString value = index.model()->data(index, Qt::EditRole).toString();

FileSelector *sel = static_cast<FileSelector*>(editor);
sel->m_edit->setText(value);

}

void FileSelectorDelegate::setModelData(QWidget *editor, QAbstractItemModel *model,const QModelIndex &index) const
{
FileSelector sel = static_cast<FileSelector>(editor);
//sel->interpretText();
QString value = sel->m_edit->text();

model->setData(index, value, Qt::EditRole);

}

void FileSelectorDelegate::updateEditorGeometry(QWidget editor,const QStyleOptionViewItem &option, const QModelIndex &/ index */) const
{
editor->setGeometry(option.rect);
}@

this code crashes when I close the table view after selecting the file. The code which creates the table is as follows

@ // Box layout to arrange the widgets in a vertical order

m_model = new QStandardItemModel();
m_delegate = new FileSelectorDelegate;
m_model->setRowCount(plist.size());
m_model->setColumnCount(2);

m_dg.tableView->setModel(m_model);
m_dg.tableView->setItemDelegate(m_delegate);
//m_dg.tableView->setItemDelegateForColumn(1, m_delegate);
//FileSelector *fselector = new FileSelector(this);

for(unsigned int i = 0; i < plist.size(); ++i)
{
    QModelIndex index1 = m_model->index(i, 0, QModelIndex());
    QModelIndex index2 = m_model->index(i, 1, QModelIndex());

    m_model->setData(index1, QVariant(QString::fromStdString(plist[i].name)));
}

for ( int i = 0; i < m_model->rowCount(); ++i )
{
    m_dg.tableView->openPersistentEditor(m_model->index(i, 1));
}
m_dg.tableView->resizeColumnToContents(0);
m_dg.tableView->resizeRowsToContents();
//m_dg.tableView->show();*/@