Question

I have two widgets defined as follows

class mainWindow : public QWidget
{
    Q_OBJECT
public:
    mainWindow();
    void readConfig();
private:
    SWindow *config;
    QVector <QString> filePath;
    QVector <QLabel*> alias,procStatus;
    QVector <int> delay;
    QGridLayout *mainLayout;
    QVector<QPushButton*> stopButton,restartButton;
    QVector<QProcess*> proc;
    QSignalMapper *stateSignalMapper, *stopSignalMapper, *restartSignalMapper;
public slots:
    void openSettings();
    void startRunning();
    void statusChange(int);
    void stopProc(int);
    void restartProc(int);
    void renew();
};
class SWindow : public QWidget
{
    Q_OBJECT
public:
    SWindow(QWidget *parent=0);
    void readConfig();
    void addLine(int);
private:
    QVector<QPushButton*> selectButton;
    QVector<QLabel*> filePath;
    QVector<QLineEdit*> alias;
    QSignalMapper *selectSignalMapper;
    QVector<QSpinBox*> delay;
    QGridLayout *mainLayout;
public slots:
    void selectFile(int);
    void saveFile();
    void addLineSlot();
};

when i create and display SWindow object from mainWindow like this

void mainWindow::openSettings()
{
    config = new SWindow();
    config->show();
}

everything is ok, but now i need to access the mainWindow from SWindow, and

void mainWindow::openSettings()
{
    config = new SWindow(this);
    config->show();
}

doesn’t display SWindow. How can i display SWindow?

How do i call a function on widget close?

Answer 1

By default a QWidget isn’t a window. If it is not a window and you specify a parent, it will be displayed inside the parent (so in your case it is probably hidden by other widgets inside your mainWindow).

Look at windowFlags() too. Or you could make your SWindow inherit from QDialog, depending on what you use it for.

As for calling a function on widget close : you could reimplement closeEvent().