[Solved] Update nonactive window in Qt 4.

HyperEngineer

I have a nonactive window that is visible. I have an active window that sends data to the nonactive window that uses it to update controls in the window. If I use update() the nonactive window does not update until it is activated. Is there a function that updates the visible part of a nonactive window?

marsupial

Have you tried the repaint()-function? I'm not sure, but it might work...

HyperEngineer

I have tried repaint() as well. The same results. The nonactive window only updates when it becomes active. I tried to use QApplication::processEvents(0), but I get an error when I build it. The error is:

MainForm.cpp:933: error: incomplete type 'QApplication' used in nested name specifier

? Offline

I was able to call repaint() of the inactive window and it worked fine.

can you post some sample code where it is failing to repaint?

@
void ChildWindow::paintEvent(QPaintEvent *pe)
{
qDebug() << "My window name is" << wName() << " " << flag;
if (flag)
{
qDebug() << "inside paint of childwindow: " << wName();
MainWindow::clik1(); //this method changes button names
}
MainWindow::paintEvent(pe);
}

void ChildWindow::setFlag()
{
flag = true;
repaint();
}

void ChildWindow::updateWin(ChildWindow *w)
{
qDebug() << "firing single shot now from active window";
QTimer::singleShot(5000, w, SLOT(setFlag()));
}
@

this is how I called the 2 child windows ...
@
ChildWindow c;
c.setWName(new QString("c"));
c.setGeometry(10,10,400,400);
c.show();

ChildWindow c1;
c1.setWName(new QString("c1"));
c1.setGeometry(510,510,400,400);
c1.show();

c1.setFocus();
c1.updateWin(&c);

@

HyperEngineer

Thanks for the reply. The program now works.

? Offline

ah cool, what made it not to work earlier? could you share that info ?