Qt: what layout or combination of layout should use in this case?

Question

I am working on a Qt Project and for this project I require to design something like this:

I have designed so far in Qt Creator and I have the component ready, but when I am trying to add widget in different layouts, I am not getting the shapes I want. What should I do to make my application resizable?

Catches:

• Sidebar has fixed width, which means for horizontal increment of window size the sidebar's horizontal width won't increase. Sidebar itself is a widget.
• upperbar's vertical width is fixed (if possible). Which means, during vertical window size increment the upperbar can't become vertically wider. And it itself is also a widget.
• the widgets by the side of sidebar are in a qstackedwidget.

Answer 1

Nested layouts:

(green square = QStackedWidget)

Steps:

[Definition]

H(x, y, ...) = horizontal layouts on x, y, ...; where x, y, ... are widget(W#) or Layout(L#)

V(x, y, ...) = horizontal layouts on x, y, ...; where x, y, ... are widget(W#) or Layout(L#)

• Step 1: V(W1, W2) = L1
• Step 2: H(W3, L1) = L2
• Step 3: V(W4, L2) = L3
• Step 4: Set L3 as the layout of current page of the StackedWidget layout
• Step 5: H(W5, StackedWidget) = L4
• Step 6: H(W6, a spacer, W7) = L5
• Step 7: V(L5, L4)

Notice that W6 and W7 are fixed in horizontal size (or set maximum on it), the spacer between them acts as the only resizable widget in the layout L5.

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And here is the hierarchy: