Re: Layout sizeHint weird behavior

[Giacomo S <gia...@el...>]

Actually, a call to replot() fixed the issue.

I don't know whether it's the best option or not. A simple updateAxes 
may be more lightweight.

Why is the default setting of QwtScaleWidget 0-100 if a plot shows 0 - 
1000 when it is actually drawn?



On 8/9/24 2:13 PM, Uwe Rathmann wrote:
> On 8/8/24 10:10, Giacomo S wrote:
>
>> Well, printing the list of major ticks, *before* the default scale 
>> bounds are set from 0 to 1000 with 6 major ticks, this is what I get:
>>
>> QwtPlot.sizeHint: Y axis ticks: 0.000000, 10.000000, 20.000000, 
>> 30.000000, 40.000000, 50.000000, 60.000000, 70.000000, 80.000000, 
>> 90.000000, 100.000000,
>
> The default setting of QwtScaleWidget is [0,100].
>
>> I think there is something (temporarily) wrong in the initialization 
>> of the scales.
>
> Well the size hints of the plot depends on the hints from the scales 
> and the hint of a scale depend on its ticks. The ticks are set in 
> QwtPlot::updateAxes, what can be called explicitly or implicitly from 
> replot. So yes - the size hint of the plot is not updated before 
> updateAxes has been called.
>
> But note, that any QWidget has to indicate changes of its size hint by 
> posting a QEvent::LayoutRequest. This might be done by 
> QWidget::updateGeometry() or manually like in QwtPlot::replot.
>
> When working with Qt layouts the event should be handled by them. If 
> not you could implement an event handler in the parent of your plot 
> widget.
>
> HTH,
> Uwe
>
>
>
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