[Solved]Find a Child in a QTreeView
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As Gerolf said you'll need to iterate over the item hierarchy yourself. If you find yourself needing to do this many times, then I would consider constructing an index object that allows you to quickly lookup the needed items based upon the roles that you need to search upon.
Something like QMap<QVariant, QStandardItem*> might be useful and will allow you to do lookups of items in O(log(n)) rather than O(n) times. Of course it will be up to you to maintain this index as your data changes.
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As it seems that you use a "QStandardItemModel":http://doc.qt.nokia.com/4.7/qstandarditemmodel.html, have you tried "QStandardItemModel::findItems() ":http://doc.qt.nokia.com/4.7/qstandarditemmodel.html#findItems already?
If you need more control you can call "QAbstractItemModel::match() ":http://doc.qt.nokia.com/4.7/qabstractitemmodel.html#match. The latter returns only a QModelIndexList, you will have to peek the items with "QStandardItemModel::itemFromIndex() ":http://doc.qt.nokia.com/4.7/qstandarditemmodel.html#itemFromIndex then.
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[quote author="gronerth" date="1301602957"]is QHash quicker?[/quote]
Possibly but it does not store the items in an ordered manner which is sometimes useful to have if you need to iterate over them in some specific order. Depends upon the exact use case you wish to cater for. -
[quote author="gronerth" date="1301605423"]Hi volker,
Well i have tried with findItems (and match), but the standarditemmodel only has the root items not the childs....I had to iterate just as Gerolf says...[/quote]
How do you create a hierarchy then? And what model do you use?
You can add Qt::MatchRecursive to the search flags of match and findItems.