I used QSplitters in a layout to split up my screen in four parts like so:

sshot.jpg

The horizontal splitter "contains" two vertical splitters

Qt Code: 
  1. verticalSplitterTop = new QSplitter();
  2. verticalSplitterTop->addWidget(&configWidget);
  3. verticalSplitterTop->addWidget(&landscapeWidget);
  4.  
  5. verticalSplitterBottom = new QSplitter(ui.centralWidget);
  6. verticalSplitterBottom->addWidget(&checkboxWidget);
  7. verticalSplitterBottom->addWidget(&graphWidget);
  8.  
  9. horizontalSplitter = new QSplitter(Qt::Vertical);
  10. horizontalSplitter->addWidget(verticalSplitterTop);
  11. horizontalSplitter->addWidget(verticalSplitterBottom);
  12.  
  13. centralLayout->addWidget(horizontalSplitter);
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and the vertical splitters are synchronized so that if one is dragged, the other one moves the same way.

Qt Code: 
  1. connect(verticalSplitterTop, SIGNAL(splitterMoved(int, int)), this, SLOT(topSplitterMoved()));
  2. connect(verticalSplitterBottom, SIGNAL(splitterMoved(int, int)), this, SLOT(bottomSplitterMoved()));
  3.  
  4. // Vertical splitter synchronization.
  5. void CaptureStepFramework::topSplitterMoved()
  6. {
  7. 	verticalSplitterBottom->setSizes(verticalSplitterTop->sizes());
  8. }
  9. void CaptureStepFramework::bottomSplitterMoved()
  10. {
  11. 	verticalSplitterTop->setSizes(verticalSplitterBottom->sizes());
  12. }
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This is to make the splitters behave like a cross. It does the job but it doesn't always look pretty. Anyhow. Now I would like to exchange the widget in the top right corner by the press of a button, and since I can't find a way to remove a widget from a splitter and to replace it with another one, I see myself forced to reconstruct the whole cross.

Qt Code: 
  1. void CaptureStepFramework::toggleMainWidget()
  2. {
  3. 	bool w = false;
  4. 	if (verticalSplitterTop->widget(1) == &limpWidget)
  5. 		w = true;
  6.  
  7. 	verticalSplitterTop = new QSplitter();
  8. 	verticalSplitterTop->addWidget(&configWidget);
  9. 	if (w)
  10. 		verticalSplitterTop->addWidget(&landscapeWidget);
  11. 	else
  12. 		verticalSplitterTop->addWidget(&limpWidget);
  13. 	verticalSplitterTop->setSizes(verticalSplitterBottom->sizes());
  14.  
  15. 	QLayout* centralLayout = ui.centralWidget->layout();
  16. 	centralLayout->removeWidget(horizontalSplitter);
  17.  
  18. 	horizontalSplitter = new QSplitter(Qt::Vertical, ui.centralWidget);
  19. 	horizontalSplitter->addWidget(verticalSplitterTop);
  20. 	horizontalSplitter->addWidget(verticalSplitterBottom);
  21. 	centralLayout->addWidget(horizontalSplitter);
  22.  
  23. 	connect(verticalSplitterTop, SIGNAL(splitterMoved(int, int)), this, SLOT(topSplitterMoved()));
  24. }
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This also does the job, but the result is ugly. The top left widget disappears for a moment. I also don't think that this code cleans up properly, but my experiments with deleteLater() or just delete things were fatal. Can anyone help me with doing this properly?

Thanks
Cruz