Missing QAbstractItemModel.multiData binding

[Phil Thompson]

Can you create a short complete example I can use?

Thanks,
Phil

On 29/08/2023 13:40, Charles wrote:
> I tried using multiData with this code snippet but it seems to crash 
> when
> setting roleData.setData(...). Also I notice that the role values might 
> be
> negative. (Btw, ic is icecream print).
> 
>     def _itemData(self, item, col):
>         match col.name:
>             case 'code':
>                 return {
>                     Qt.DisplayRole: item.code,
>                 }
>             case 'earnings_chg':
>                 return {
>                     Qt.DisplayRole: f'{item.earnings_chg}%',
>                 }
>             case 'time':
>                 return {
>                     Qt.DisplayRole: item.time.strftime('%Y-%m-%d'),
>                 }
>             case 'earnings':
>                 return {
>                     Qt.DisplayRole: formatMoney(item.earnings),
>                 }
> 
>     def multiData(self, index, roleDataSpan):
>         ic(index, roleDataSpan)
>         item = self._items[index.row()]
>         col = self.COLUMNS[index.column()]
>         itemData = self._itemData(item, col)
>         for roleData in roleDataSpan:
>             role = roleData.role()
>             ic(role)
>             if value := itemData.get(role):
>                 roleData.setData(value)
>             else:
>                 match role:
>                     case Qt.FontRole:
>                         roleData.setData(style.TABLE_FONT)
>                     case Qt.TextAlignmentRole:
>                         align = col.align
>                         if align == 'C':
>                             roleData.setData(Qt.AlignCenter)
>                         elif align == 'R':
>                             roleData.setData(Qt.AlignVCenter |
> Qt.AlignRight)
> 
> ic| earnings.py:66 in multiData()
>     index: <PyQt6.QtCore.QModelIndex object at 0x000001D17B77D000>
>     roleDataSpan: <PyQt6.QtCore.QModelRoleDataSpan object at
> 0x000001D17B77D4D0>
> ic| earnings.py:72 in multiData()- role: 6
> ic| earnings.py:72 in multiData()- role: 7
> ic| earnings.py:72 in multiData()- role: 9
> ic| earnings.py:72 in multiData()- role: 10
> ic| earnings.py:72 in multiData()- role: 1
> ic| earnings.py:72 in multiData()- role: 0
> ic| earnings.py:72 in multiData()- role: 8
> ic| earnings.py:72 in multiData()- role: -948493808
> ic| earnings.py:72 in multiData()- role: 1897532384
> ic| earnings.py:72 in multiData()- role: 1897532384
> ic| earnings.py:72 in multiData()- role: 2033014364
> ic| earnings.py:72 in multiData()- role: 2
> ic| earnings.py:72 in multiData()- role: 16777216
> ic| earnings.py:72 in multiData()- role: 1893028080
> ic| earnings.py:72 in multiData()- role: 1897532384
> ic| earnings.py:72 in multiData()- role: 1897532384
> ic| earnings.py:72 in multiData()- role: 2033014458
> ic| earnings.py:72 in multiData()- role: 2
> ic| earnings.py:72 in multiData()- role: 2033021932
> ic| earnings.py:72 in multiData()- role: 3
> ic| earnings.py:72 in multiData()- role: 524288
> ic| earnings.py:72 in multiData()- role: 1893028080
> ic| earnings.py:72 in multiData()- role: 1897532384
> ic| earnings.py:72 in multiData()- role: 1897532384
> ic| earnings.py:72 in multiData()- role: 2033022038
> ic| earnings.py:72 in multiData()- role: 1
> ic| earnings.py:72 in multiData()- role: 22528
> ic| earnings.py:72 in multiData()- role: 1893028080
> 
> On Sun, Aug 27, 2023 at 10:45 PM Phil Thompson 
> <phil at riverbankcomputing.com>
> wrote:
> 
>> On 14/08/2023 16:21, Jakub Fránek wrote:
>> > Hello
>> >
>> > I am working on a PyQt app that features a large QTableView driven by a
>> > custom QAbstractTableModel implementation. Profiling shows that even
>> > after
>> > heavy optimization, the program spends a lot of time calling
>> > QAbstractItemModel.data method.
>> >
>> > I think that QAbstractItemModel.multiData method could improve the
>> > performance considerably, however it seems that PyQt does not support
>> > this
>> > binding (since it does not even support QModelRoleDataSpan).
>> >
>> > My question is: is there any plan of supporting
>> > QAbstractItemModel.multiData method in the future? If there is no such
>> > plan
>> > yet, I would like to cast my vote and humbly request this binding in
>> > some
>> > future version of PyQt.
>> 
>> multiData() and QModelRoleSpan are implemented in the next snapshot -
>> please test.
>> 
>> Phil
>>