[Development] sizeHint for QAbstractScrollArea, especially item views

[Christoph Schleifenbaum]

Hi,

currently, item views do return a rather random size hint. Some at KDAB, including me, would love to see a size hint actually being related to the scroll area's content. For this, we thought of a method viewportSizeHint which returns the size of the viewport as if there would be no scroll bars required.

The most common use case for this is a list or a table of data in a window:

a) The ui designer doesn't need to set a custom size for the view, the size hint will make sure all data are visible

b) The amount of data might grow, in that case it might made sense to enlarge the view. Imagine three tree views below each other inside a scroll area. If the tree views would stay at their size, a scroll bar would appear in both the tree view and in the surrounding scroll area. This won't happen with a proper size hint combined with a size policy.

I'v attached a patch to the current qtbase.git. It does the described behaviour for QScrollArea and QTableView. Try running the example at examples/itemviews/spreadsheet to see what happens if you e.g. resize the columns in the table view.


Thoughts?


Cheers,
Christoph

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Christoph Schleifenbaum | christoph.schleifenbaum at kdab.com | Software Engineer
Klarälvdalens Datakonsult AB, a KDAB Group company
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