Qt-jambi-interest Archive, March 2007
Re: Model update in QTreeView ?
Message 1 in thread
Gunnar Sletta schrieb:
> The function you're looking for is QAbstractItemModel.createIndex();
>
> http://doc.trolltech.com/qtjambi-1.0/com/trolltech/qt/core/QAbstractItemModel.html#createIndex(int,%20int)
>
I'm having a similar problem but not the same it seems. If I have a
dynamic datamodel, e.g. nodes are asynchronous queried when
child(Object, int) is called and when the result from this query returns
i want to update this node, how should i do that? I mean, in this case i
only have the data but no idea which index it is on, therefor
createIndex(int, int) is rather useless (sure, i could simply update the
whole tree, but that's ... hu ;)).
Best regards
Georg Schild
Message 2 in thread
Georg Schild wrote:
> Gunnar Sletta schrieb:
>
>> The function you're looking for is QAbstractItemModel.createIndex();
>>
>> http://doc.trolltech.com/qtjambi-1.0/com/trolltech/qt/core/QAbstractItemModel.html#createIndex(int,%20int)
>>
>
> I'm having a similar problem but not the same it seems. If I have a
> dynamic datamodel, e.g. nodes are asynchronous queried when
> child(Object, int) is called and when the result from this query returns
> i want to update this node, how should i do that? I mean, in this case i
> only have the data but no idea which index it is on, therefor
> createIndex(int, int) is rather useless (sure, i could simply update the
> whole tree, but that's ... hu ;)).
So you're saying that after you update all of node x' children you want
to update the value of node x? Here you would need the Object ->
QModelIndex function which is currently not available, but which is on
our todolist.
-
best regards,
Gunnar
Message 3 in thread
Gunnar Sletta schrieb:
>
> So you're saying that after you update all of node x' children you
> want to update the value of node x? Here you would need the Object ->
> QModelIndex function which is currently not available, but which is on
> our todolist.
Almost, but yes, i was looking for this function ;). I want to tell the
tree to update this node's children, maybe by removing its children
before (which is not the problem imho). So in the first way, before the
query to the nodes children is triggered i simply return 0 children (or
anything else), then after the query returned (i just call it query
here, it's not database related) i trigger an update of this node. So
the model will re-ask for its children etc.
best regards
Georg Schild
Message 4 in thread
Georg Schild wrote:
> Gunnar Sletta schrieb:
>
>>
>> So you're saying that after you update all of node x' children you
>> want to update the value of node x? Here you would need the Object ->
>> QModelIndex function which is currently not available, but which is on
>> our todolist.
>
> Almost, but yes, i was looking for this function ;). I want to tell the
> tree to update this node's children, maybe by removing its children
> before (which is not the problem imho). So in the first way, before the
> query to the nodes children is triggered i simply return 0 children (or
> anything else), then after the query returned (i just call it query
> here, it's not database related) i trigger an update of this node. So
> the model will re-ask for its children etc.
Ideally you could return 0 the first time and then call
QTreeModel.childrenInserted() when the children are in place, again this
function takes a QModelIndex so you can't really call it...
-
Gunnar
