Simple Mdi question

[gojkovicde]

I know it's been more than a year since the last post, but I don't think I should open another threat because of that.

The grandparent of the first widget, if it exists, can be cast to QMdiArea to add another widget...

Can you be more specific about how to do that? Maybe a short example would help..

What I have is QMainWIndow as a parent, QMdiArea as a central widget. User opens form2 from the menu bar, and its added to QMdiSubWindow. If the users clicks the button on form2, it should open form3 and it should be added to QMdiSubWindow also.

Thank you for your help,
Dejan

[gojkovicde]

Anyone ?
Dejan

[ChrisW67]

I think you should prefer using a signal. Here is one of many ways to organise this:

#include <QtGui>
 
class PushButton: public QPushButton
{
    Q_OBJECT
public:
    PushButton(QWidget *p = 0): QPushButton(p) {
        connect(this, SIGNAL(clicked()), SLOT(doClicked()));
    }
 
private slots:
    void doClicked() {
        QTextEdit *edit = new QTextEdit(this);  // could be any widget
        emit addAnotherMdiChild(edit);
    }
 
signals:
    void addAnotherMdiChild(QWidget *child);
};
 
 
class MainWindow: public QMainWindow
{
    Q_OBJECT
public:
    MainWindow(QWidget *p = 0): QMainWindow(p) {
        m_area = new QMdiArea(this);
        setCentralWidget(m_area);
 
        PushButton *button = new PushButton(this);
        button->setText("Add another widget");
        connect(button, SIGNAL(addAnotherMdiChild(QWidget *)), SLOT(doAddAnotherMdiChild(QWidget *)));
        doAddAnotherMdiChild(button);
    }
 
public slots:
    void doAddAnotherMdiChild(QWidget *child) {
        (void) m_area->addSubWindow(child);
        child->show();
    }
 
private:
    QMdiArea *m_area;
};
 
 
int main(int argc, char **argv) {
    QApplication app(argc, argv);
 
    MainWindow w;
    w.show();
    return app.exec();
}
#include "main.moc"

#include <QtGui>

class PushButton: public QPushButton
{
    Q_OBJECT
public:
    PushButton(QWidget *p = 0): QPushButton(p) {
        connect(this, SIGNAL(clicked()), SLOT(doClicked()));
    }

private slots:
    void doClicked() {
        QTextEdit *edit = new QTextEdit(this);  // could be any widget
        emit addAnotherMdiChild(edit);
    }

signals:
    void addAnotherMdiChild(QWidget *child);
};


class MainWindow: public QMainWindow
{
    Q_OBJECT
public:
    MainWindow(QWidget *p = 0): QMainWindow(p) {
        m_area = new QMdiArea(this);
        setCentralWidget(m_area);

        PushButton *button = new PushButton(this);
        button->setText("Add another widget");
        connect(button, SIGNAL(addAnotherMdiChild(QWidget *)), SLOT(doAddAnotherMdiChild(QWidget *)));
        doAddAnotherMdiChild(button);
    }

public slots:
    void doAddAnotherMdiChild(QWidget *child) {
        (void) m_area->addSubWindow(child);
        child->show();
    }

private:
    QMdiArea *m_area;
};


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

    MainWindow w;
    w.show();
    return app.exec();
}
#include "main.moc"

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[gojkovicde]

Thank you for the advice and example, I'll get into details of it as soon as I can..
Dejan