Basic question, labels in vertical layout not showing...

[SPlatten]

Sorry if this is one of those basic questions. I have a window on the display, I want to add quick debug information to the form. I have added a label which was simple enough:

mplblAddress = new QLabel(this);
mplblAddress->setText(cstrAddress);

The above works, now I want two lines so I thought, add a QVBoxLayout then add both labels to the layout:

QVBoxLayout* pobjVBLO(new QVBoxLayout(this));
mplblAddress = new QLabel;
mplblAddress->setText(csrAddress);
pobjVBLO->addWidget(mplblAddress);
mplblInfo = new QLabel;
mplblInfo->setText(cstrInfo);
pobjVBLO->addWidget(mplblInfo);

Nothing is displayed, I also tried:

QVBoxLayout* pobjVBLO(new QVBoxLayout;
mplblAddress = new QLabel;
mplblAddress->setText(csrAddress);
pobjVBLO->addWidget(mplblAddress);
mplblInfo = new QLabel;
mplblInfo->setText(cstrInfo);
pobjVBLO->addWidget(mplblInfo);
setLayout(pobjVBLO);

Nothing is displayed this way either. What haven't I done?

this is the window class.

[SPlatten]

@SGaist , ok, fixed by adding the following:

QWidget* pobjWidget(new QWidget(this));
QVBoxLayout* pobjVBLO(new QVBoxLayout);
pobjVBLO->addWidget(mplblAddress);
pobjVBLO->addWidget(mplblInfo);
pobjWidget->setLayout(pobjVBLO);
setCentralWidget(pobjWidget);

[jsulm]

@SPlatten Where are you adding the labels to the layout?

[SPlatten]

@jsulm , sorry, I was typing the source in on a different computer to post as the system the code is on does not have internet access, I missed out those lines, I've edited my original correcting the post.

[SGaist]

Hi,

Any chances that you already have a layout on that widget ?

[SPlatten]

@SGaist , I don't think so because there is no UI and the class is derived from QMainWindow, the constructor has nothing in it....however I will call layout to see what is returned.

[Edit], so I added:

QLayout* pobjLayout(this->layout());

And an address is returned NOT null, so where or what would be setting this?

[SGaist]

And here we have a winner: QMainWindow. That class already has a layout that does all the docking, toolbar, etc handling and that cannot be replaced.

[SPlatten]

@SGaist , ok, fixed by adding the following:

QWidget* pobjWidget(new QWidget(this));
QVBoxLayout* pobjVBLO(new QVBoxLayout);
pobjVBLO->addWidget(mplblAddress);
pobjVBLO->addWidget(mplblInfo);
pobjWidget->setLayout(pobjVBLO);
setCentralWidget(pobjWidget);