Qt-interest Archive, March 2002
Open sub-window
Message 1 in thread
I explained myself poorly the last time, probably why I got no replies. I'll
try again.
I have a main window in my application. There is a button, myPushButton,
which , when pressed, opens a sub-window. This sub-window is declared as a
QWidget and contains simple things such as buttons.
When myPushButton is clicked a SLOT named openSubWindow() is called. I have
the following code which compiles but when the button is clicked the
sub-window does not appear.
connect(myPushButton, SIGNAL (clicked()), this, SLOT (openSubWindow()));
void MainWindow::openSubWindow()
{
SubWindow s;
s.setGeometry (100, 0, 500, 660 );
s.show();
}
Thanks
Message 2 in thread
Your sub-window has no parent. Try:
SubWindow(this);
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Message 3 in thread
The SunWindow "s" is deleted when the slot function exits. This would be ok if it were a modal dialog, but that would have to be
started with s.exec().
For dialogs that are not model, create the SubWindow on the heap (using "new"), and preferably set the Qt::WDestructiveClose flag so
that you do not have to worry about deleting it. But that depends on your code...
One more thing: setGeometry is not really useful for toplevel widgets. The position is more reliably set with QWidget::move(...),
and the size should better be determined by the layout manager, use QWidget::resize(...) if you want to provide it yourself.
- Soeren
> When myPushButton is clicked a SLOT named openSubWindow() is called. I have
> the following code which compiles but when the button is clicked the
> sub-window does not appear.
>
> connect(myPushButton, SIGNAL (clicked()), this, SLOT (openSubWindow()));
>
> void MainWindow::openSubWindow()
> {
>
> SubWindow s;
> s.setGeometry (100, 0, 500, 660 );
> s.show();
>
> }
Message 4 in thread
Hello,
>
> void MainWindow::openSubWindow()
> {
>
> SubWindow s;
> s.setGeometry (100, 0, 500, 660 );
> s.show();
>
> }
SubWindow s is local variable. Try:
SubWindow *s = new SubWindow;
s->setGeometry (100, 0, 500, 660 );
s->show();
Regards
Ilir
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