QTextEdit zoomIn() and zoomOut() appear to do nothing. What am I doing wrong?

[dave]

I can't really find any example how to use these functions. I though it was a simple matter of calling them, but it appears to have no effect on the widget. The whole idea of calling them manually was after I found out that ctrl+mouse wheel didn't zoom in/out the text as claimed in Qt help. So I made a QAction to do that instead. I can see the functions get called but nothing happens.

Thanks
Dave

[Lykurg]

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
 
    QTextEdit e;
    e.setText("test foo bar");
    e.showMaximized();
 
    QTimer t;
    t.setInterval(150);
    QObject::connect(&t, SIGNAL(timeout()), &e, SLOT(zoomIn()));
    t.start();
 
    return app.exec();
}

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

    QTextEdit e;
    e.setText("test foo bar");
    e.showMaximized();

    QTimer t;
    t.setInterval(150);
    QObject::connect(&t, SIGNAL(timeout()), &e, SLOT(zoomIn()));
    t.start();

    return app.exec();
}

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Works for me. If it also works for you, then your code has some errors and you have to show us how you do it.

[dave]

Well, your code worked for me too . So I tried to narrow down why mine didn't. The following code exhibit the same symptoms as my code (at least on my machine). I still have no idea what am I doing wrong.

#include <QApplication>
#include <QTextEdit>
#include <QTimer>
#include <QFont>
 
 
int main(int argc, char *argv[])
{
 
    QApplication app(argc, argv);
 
    QTextEdit e;
 
    QFont f("Arial", 14);
 
    e.setCurrentFont(f);
 
    e.setText("test foo bar");
 
    e.showMaximized();
 
 
    QTimer t;
 
    t.setInterval(150);
 
    QObject::connect(&t, SIGNAL(timeout()), &e, SLOT(zoomIn()));
 
    t.start();
 
    return app.exec();
}

#include <QApplication>
#include <QTextEdit>
#include <QTimer>
#include <QFont>


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

    QApplication app(argc, argv);

    QTextEdit e;

    QFont f("Arial", 14);

    e.setCurrentFont(f);

    e.setText("test foo bar");

    e.showMaximized();


    QTimer t;

    t.setInterval(150);

    QObject::connect(&t, SIGNAL(timeout()), &e, SLOT(zoomIn()));

    t.start();

    return app.exec();
}

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[Lykurg]

You have to use setFont(). Then it works. setCurrentFont adds a "permanent" font.