[SailfishDevel] Seg fault in QML ListView when connected to SQL model

[Dmitriy Purgin]

Hi,

can you tell please what are you trying to achieve, e.g. what view are you
building? Why do you set explicit height for the ListView anyway?

Cheers
Dmitriy

2015-09-06 14:00 GMT+06:00 coding <coding at userspace.se>:

> Hi,
>
> I am developing a sailfish app using a QML ListView which is connected to
> a model using a sqlite db. The model is based on QSqlTableModel, but
> extended so it can be used by the QML ListView. I have found a segmentation
> fault related to the ListView when trying to delete an element in the
> ListView using the ContextMenu. I considered reporting this as a bug to
> qt.io, but I decided to post it here first.
>
> I have tried to reproduce the problem with a short code snippet, but since
> the bug needs the SQL model it was hard to get it very short.
> QML code: http://pastebin.com/b5zkFm1q
> C++ code: http://pastebin.com/5RN269kH
> gdb trace: http://pastebin.com/4ZdCbZd6
> app debug output: http://pastebin.com/C4N9T1tP
>
> How to reproduce:
> 1. Start app (in emulator, I don't have my jolla tablet yet)
> 2. Long press the last element in the list and select "Delete" from the
> context menu.
> (It can also be triggered from other elements in the list, but the code at
> pastebin is based on the last element)
>
> The bug is triggered if the bottom of ContextMenu is rendered below the
> height of the ListView.
> When long pressing the n:th element in the ListView it will crash if:
> listviewHeight < n*elementHeight+(n-1)*spacing + contextMenuHeight
>
> Example (using pastebin code):
> ListView is 338 pixels high and have 4 items inside
> Each item is 44 pixels high
> Spacing is 1 pixel
> Context menu is 160 pixels high
>
> When clicking on the 4:th item (starting counting from 1) the total height
> of items + spacing + context menu will be:
> 4*(44) + (4-1)*1 + 160 = 339 pixels
> listviewHeight=338 => crash
> listviewHeight=339 => not crash
>
> When deleting the element in the list I do two things:
> 1. model->removeRow(index) //Everything is fine after this is executed
> 2. model->submitAll() //Results in segmentation fault
>
> I have tried replacing the model with a QML ListModel, created/filled in
> QML, but then the bug is not triggered.
>
> Any input would be appreciated!
> _______________________________________________
> SailfishOS.org Devel mailing list
> To unsubscribe, please send a mail to
> devel-unsubscribe at lists.sailfishos.org
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.sailfishos.org/pipermail/devel/attachments/20150907/9e161195/attachment.html>