Not clear what you want to achieve, but QWidget has a method to get its parent. However I don’t see the problem on keeping a pointer/reference to the widget somewhere, e.g., in your main window class.

Also QObject::children() [doc.qt.nokia.com] could be helpful for you.

[EDIT: merged two comments, please edit comments, do not double comment, Volker]

AFter i pressed a button on my shown widget i want to change the state of a label in the Mainclass.

And i tried to do this just like I do in Java but I got alot of errors in that case

You should NOT change the label from the button class. Use signal/slots mechanism to notify the main widget class of the requested change. The buttons provide a clicked() signal that you can connect to.

So this code is Compleatly wrong

Just a little pseudo

On the widgets Button click()
mainwindow->Label->setText(“Text I want to setSet”)

—

Steps are the following:

• connect a signal from your button to a slot of yours
  
  1. connect( myButton, SIGNAL(clicked()), this, SLOT(updateLabelSlot()));
• in the slot perform the update of the text
  
  1. void MainWindow::updateLabelSlot(){
  2.    Label->setText("whatever you want");
  3. }

I’m very bad to explain my problem I think.
Bad english

My case

I got a mainwindow with some widgets .
Qlabel Qtab etc etc

On every tab i have diffrent widgets(Qtforms and Classes)
i Instance the Class when i open that tab
and show that widget.

for exampel
On one widget there are ex . 6 buttons with diffrent conditions and when i click a button i want the text on the Label on the mainwindow to append or change the text.

Is the post above the rigth way to handel this case?

I’ll give it a try.
//Thomas

Hi Thomas,

in that case you would connect the buttons’ clicked() signals to on or more internal slot(s) of your widget. In that you emit a newly defined signal, e.g. changeLabelText(QString). You then connect that signal to the main window’s label.

eg.

You can ease your life, if you create a base class MyTabContentWidget which does less more than define the signal changeLabelText and subclass your actual widgets from that. This way you have a nice interface to use in your main widget.