Invoking a QFileDialog from another dialog

[skimpax]

Hi,

I want to invoke a FileDialog from another dialog window :

I am in my tool options configuration dialog box (which works in a classic manner, with Accept/Cancel buttons which respectively accept new configuration or cancel changes). In one of this, I need to make user select a directory, so I want to invoke QFileDialog for this.
But system hangs at runtime, due to modal aspects.

Any idea to launch QFileDialog from a dialog ?

BR

[JohannesMunk]

Hi there!

I was curious if I could reproduce this problem:

project file:
 
TEMPLATE = app
TARGET = modalmodal
SOURCES += main.cpp
HEADERS += forms.h
 
forms.h
 
#ifndef FORMS_H
#define FORMS_H
 
#include <QtGui>
#include <QDebug>
 
class OptionDialog : public QDialog
{    Q_OBJECT
public:
    OptionDialog() {
        setModal(true);
        setGeometry(100,100,320,240);
        setAttribute(Qt::WA_DeleteOnClose,true);
        button = new QPushButton("Open File ..",this);
        connect(button,SIGNAL(clicked()),this,SLOT(openFileDialog()));
    }
protected slots:
    void openFileDialog() {
        QString fileName = QFileDialog::getOpenFileName(this, "Test Dialog", "", "Zip-File (*.zip)");
        qDebug() << fileName;
    }
private:
    QPushButton* button;
};
 
class MainForm : public QWidget
{    Q_OBJECT
public:
    MainForm() {
        setGeometry(50,50,640,480);
        button = new QPushButton("Option Dialog",this);
        connect(button,SIGNAL(clicked()),this,SLOT(showOptionDlg()));
    }
protected slots:
    void showOptionDlg() {
        OptionDialog* opt = new OptionDialog();
        opt->show();
    }
private:
    QPushButton* button;
};
 
#endif // FORMS_H
 
main.cpp:
 
#include <QtGui>
#include <QApplication>
#include "forms.h"
 
int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
 
    MainForm mainform;
    mainform.show();
 
    app.connect(&app, SIGNAL(lastWindowClosed()), &app, SLOT(quit()));
    return app.exec();
}

project file:

TEMPLATE = app
TARGET = modalmodal
SOURCES += main.cpp
HEADERS += forms.h

forms.h

#ifndef FORMS_H
#define FORMS_H

#include <QtGui>
#include <QDebug>

class OptionDialog : public QDialog
{    Q_OBJECT
public:
    OptionDialog() {
        setModal(true);
        setGeometry(100,100,320,240);
        setAttribute(Qt::WA_DeleteOnClose,true);
        button = new QPushButton("Open File ..",this);
        connect(button,SIGNAL(clicked()),this,SLOT(openFileDialog()));
    }
protected slots:
    void openFileDialog() {
        QString fileName = QFileDialog::getOpenFileName(this, "Test Dialog", "", "Zip-File (*.zip)");
        qDebug() << fileName;
    }
private:
    QPushButton* button;
};

class MainForm : public QWidget
{    Q_OBJECT
public:
    MainForm() {
        setGeometry(50,50,640,480);
        button = new QPushButton("Option Dialog",this);
        connect(button,SIGNAL(clicked()),this,SLOT(showOptionDlg()));
    }
protected slots:
    void showOptionDlg() {
        OptionDialog* opt = new OptionDialog();
        opt->show();
    }
private:
    QPushButton* button;
};

#endif // FORMS_H

main.cpp:

#include <QtGui>
#include <QApplication>
#include "forms.h"

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

    MainForm mainform;
    mainform.show();

    app.connect(&app, SIGNAL(lastWindowClosed()), &app, SLOT(quit()));
    return app.exec();
}

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This works without any problems..

Did you maybe miss to pass the modal option dialog as parent to the FileDialog?

Johannes

[skimpax]

OK, thanks to your example, I understood the error : It was related to modal as you suggested.
Many thanks.