[Qt-interest] How the Qt-designer "Widget-Box" is developed. - Can I see the source code for the same!

[Santhosh Y]

Hi,

Please find the attached file in which the Qt-Designer snapshot is shown.
In widget Box which is highlighted in red in the attached document, 
"Layouts, Spacers, Buttons, Item Views" are in layout.

How they developed this Widget Box, so that the underlying items having 
such layout so that, each item can be expanded or collapsed.

Please help me or suggest me where to find the code for the same.

Is the source code for developing Qt-designer is available?

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Y Santhosh Kumar
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