[Interest] QTreeView and dynamic sorting

[André Somers]

Op 16-10-2013 15:04, Igor Mironchik schreef:
> Forgot to say that I use
>
> d->m_sortModel->setDynamicSortFilter(false);
>
> because of dynamic sorting moves the rows with the same value in a 
> sorted column in its sole discretion from time to time.
Still, here is your problem. The problem is that appearantly, by 
default, QSortFilterProxyModel does not use a stable sort algoritm. I'd 
reimplement QSFPM to use a stable algorithm instead.

André


>
>
>> Hi.
>>
>> I use QTreeView to display dynamic data. I.e. rows can be inserted 
>> during program execution dynamically and values in some column can be 
>> changed dynamically too. But I need QTreeView to be sorted by the 
>> given by user column when new rows added.
>>
>> I've connected to the rowsInserted signal:
>>
>> connect(d->m_model,
>> 	SIGNAL(  rowsInserted(  const  QModelIndex  &,  int,  int  )  ),
>> 	this,  SLOT(  rowsAdded(  QModelIndex,  int,  int  )  )  );
>>
>> And in the slot I do the next:
>>
>> void
>> ChannelView::rowsAdded(  const  QModelIndex  &  parent,  int  start,  int  end  )
>> {
>> 	Q_UNUSED(  parent  )
>> 	Q_UNUSED(  start  )
>> 	Q_UNUSED(  end  )
>>
>>
>> 	qDebug()  <<  "SORT"  <<  parent  <<  start  <<  end;
>>
>> 	d->m_sortModel->sort(  d->m_sortModel->sortColumn(),
>> 		d->m_sortModel->sortOrder()  );
>> }
>>
>> But I see that QTreeView doesn't sorted by the given column when the data in that column is static.
>>
>> In the debug print I see the next:
>>
>> SORT QModelIndex(-1,-1,0x0,QObject(0x0)) 0 -1
>> SORT QModelIndex(-1,-1,0x0,QObject(0x0)) 0 0
>> SORT QModelIndex(-1,-1,0x0,QObject(0x0)) 1 1
>> SORT QModelIndex(-1,-1,0x0,QObject(0x0)) 2 2
>>
>> I've inserted three rows only but rowsInserted emitted four times. Why?
>>
>> What am I doing wrong?
>>
>> Thanks.
>>
>> -- 
>> Best Regards,
>> Igor Mironchik.
>
>
> -- 
> Best Regards,
> Igor Mironchik.
>
>
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