[Qt-interest] Model/View speed of Models with many many itemsand item changes

[Heiko Steindl]

Hi all! :)

I tried it out now with different things.

The fastest way is (at least for me) to block the signals and than to
process the model row-by-row,
even if there is no change of the data (and skip the item of course),
instead of searching for the items,  which should be changed and than
after all work is done,
to deactivate the blocking of the signals.

Now it processes about 10.000 items in ~ 35 - 40 seconds. :)

I would to thank you all for all tips and help about this! :)

Best regards

Heiko

-- 


Mit freundlichen Grüßen

Heiko Steindl

Computerhaus EDV-Handels Ges.m.b.H
Wienerstrasse 35a
8605 Kapfenberg AUSTRIA

Tel: +43 (0)3862 27777
Fax: +43 (0)3862 27777 77
Mobil: +43 (0)676 3727777
E-Mail: heiko at kom.at




Scott Aron Bloom schrieb:
>> On Saturday 13 June 2009 01:09:04 RZ wrote:
>>     
>>> But the block signals effect was quite overwhelming and sufficient -
>>> so I stopped optimizing everything else ;-)
>>>       
>> As far as I know this means all the update signals are then send
>>     
> afterwards.
>   
>> Which mean after changing 10.000 data points, instead of a continuous
>>     
> stream
>   
>> of 10.000 dataChanged(index) signals, you will get them all after the
>>     
> signals
>   
>> are unblocked again. 
>>     
>
> This is simply not true...  Blocked signals are lost for good.  You are
> thinking events.
>
>
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