Improve central widget handling

[narnaud]

Right now, the central widget (like in QApplication) is a DockWidget, and it's not entirely obvious how the API should be use:

auto mainWindow = new KDDockWidgets::MainWindow("MainWindow", KDDockWidgets::MainWindowOption_HasCentralFrame, );
auto centralWidget = new KDDockWidgets::DockWidget("Sketchup_CentralWidget");
auto widget = new MyCentralWidget;
centralWidget->setWidget(widget);
addDockWidgetAsTab(centralWidget);

At this point, it shows the central widget with a tabBar, so one has to do something like this to hide it:

centralWidget->findChildren<QTabBar*>().first()->hide();

API issue: it would be nice to have a simpler API, like there is one in QApplication (hiding the fact that you need to create a KDDockWidget).

Also, it would be nice to have a bit more choices on the mainwindow type, I can see 4 as now:

• NoFrame
• CentralWidget (not showing any tab bars, as there's only one widget)
• TabBar
• MDI

IMO you can't remove the tabBar if there's only one widget, as it may be needed, that's why I'm thinking of a new mode.

[iamsergio]

The goal of "Central Widget" is to have "central document mode", like you'll see in IDEs, there you also can't remove the tabbar.

I guess you don't want your central widget to be detachable ?

[narnaud]

No, there's only one widget. I would like something close to QMainWindow::setCentralWidget.

[iamsergio]

Ok, that's doable.
However it can be weird if you dock a lot of stuff on the left, then your central widget isn't exactly in the "center".
This is more of a conceptual problem though, which is expected

[narnaud]

Think about it more as "this is my main widget/view" rather than "this is my central widget/view", and the rest is docks around (left/right/top/bottom).
Of course there could be docks only on the left, but the view still remain the main view, the one the user is interacting the most with.

[iamsergio]

makes sense