[Development] qsizetype and classes working with QStrings or QList

Matthew Woehlke mwoehlke.floss at gmail.com
Tue Aug 25 19:34:05 CEST 2020

On 25/08/2020 01.24, Philippe wrote:
> But then there would be the need to make QAbstractSlider be able to
> handle 64 bit quantities too.

Well, since you mentioned it:


No, that isn't a two-headed slider, it's a slider that works on 
`double`. Doesn't derive from QAbstractSlider because it can't.

These are hardly uncommon; GIMP has tons of examples, for instance, in 
many, many filter options dialogs (although the widget they use isn't 
entirely like QSlider). Yes, you can sort-of emulate them with integers 
under the hood, but doing so adds an annoying level of dissonance to the 

Q[Abstract]Slider being limited to `int` is indeed an irritation. We 
have QDoubleSpinbox, why not QDoubleSlider?


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