[Interest] I feel stupid: QStandardItem::insertRows: Ignoring duplicate insertion of item

[Frank Rueter | OHUfx]

Thanks Kevin, I will read up on that.


On 27/04/17 3:47 AM, Kevin Funk wrote:
> On Wednesday, 26 April 2017 21:32:13 CEST Frank Rueter | OHUfx wrote:
>> You are dead right as my follow up email confirms.
>> Now the question is how to use the same (parented) item in a tree view
>> and a list view.
> That's discussed over here:
>    http://stackoverflow.com/questions/19498753/append-qstandarditem-in-two-qstandarditemmodel-at-the-same-time
>
> You might want to start writing a proper model (QAbstractItemModel based)
> instead. Or you'll need to create copies of the QStandardItems (which is
> probably undesired as you manually need to keep them in sync if needed).
>
> Hope that helps,
> Kevin
>
>> I guess I will be RTFM-ing a bit.
>>
>> Cheers,
>> frank
>>
>> On 26/04/17 9:24 PM, Kevin Funk wrote:
>>> On Wednesday, 26 April 2017 19:50:54 CEST Frank Rueter | OHUfx wrote:
>>>> Hi,
>>>>
>>>> I seem to run into this issue a lot and I don't get why:
>>>> I have a list of sub-classed QStandardItems that another processor
>>>> generated, and I want to add them to a QStandardItemModel like this:
>>>>
>>>> for item in myItemList:
>>>>        self.model.appendRow(item)
>>>>
>>>> The model is empty and hasn't been used at this point. Yet I get none of
>>>>
>>>> my items but one of those errors for each item:
>>>>        QStandardItem::insertRows: Ignoring duplicate insertion of item
>>> Use the source, Luke :)
>>>
>>> QStandardItemModel::appendRow calls
>>> - QStandardItem::appendRow which calls
>>> - QStandardItem::insertRow which calls
>>> - QStandardItemPrivate::insertRows [1]
>>>
>>> Excerpt from QStandardItemPrivate::insertRows:
>>> ```
>>> //...
>>> if (item->d_func()->parent == 0) {
>>>
>>>       item->d_func()->setParentAndModel(q, model);
>>>
>>> } else {
>>>
>>>       qWarning("QStandardItem::insertRows: Ignoring duplicate insertion of
>>>       item
>>>
>>> %p",
>>>
>>>                item);
>>>       
>>>       item = 0;
>>>
>>> }
>>> //...
>>> ```
>>>
>>> => The warning is thrown when your items already have a parent set
>>>
>>> Is that the case for you?
>>>
>>> Hope that helps,
>>> Kevin
>>>
>>> PS: The Woboq code browser is an awesome tool to follow call chains (or
>>> any
>>> decent IDE will do, if you have the Qt sources)
>>>
>>> [1] https://code.woboq.org/qt5/qtbase/src/gui/itemmodels/
>>> qstandarditemmodel.cpp.html#_ZN20QStandardItemPrivate10insertRowsEiiRK5QLi
>>> stIP13QStandardItemE>
>>>> I know I should know this but I can't figure out why this is happening.
>>>> Is there something special I need to do when subclassing QStandardItem?
>>>>
>>>>
>>>> Cheers,
>>>> frank
>