Op 13-11-2011 11:33, Johan Paul schreef: > In general Qt Quick (at least 1) is in general not very good with > dynamically changing data models in List views. > > And in any more complicated cases than showing a few static items in a > QML List, I would go with exposing a QAbstractListModel to Qt Quick > instead of the QList<QObject *> approach. > > http://doc.qt.nokia.com/latest/qdeclarativemodels.html#qabstractitemmodel > > Then, at least in theory, you have the possibility to efficiently change > the content of your model asynchronously. > > > Cheers, > > Johan > > >> Hi, >> >> I was previously adding objects one-by-one... I tried updating >> everything at once as you mentioned (ie. with QObjectList) and there was >> no delay at all, which is awesome :) >> However, doing this isn't really ideal in all cases -- for example, if I >> asynchronously receive a bunch of objects I need to update the view >> with, I'm stuck. Not really. You can also append a QObjectList. Just make sure that you don't call append or insert more often than needed. You can use a scheme like I detailed here [1] to prevent making changes too often. >> >> Also as an aside (but related question), is using QObjectListModel with >> threading safe? Object or methods on objects that are not explicitly documented as thread save, should not be assumed to be be thread save. >> Ie, am I allowed to use it outside of the main thread? No, but you can use signals and slots to communicate in a thread save way. >> If you try to move QObjectListModel into its own thread, you need to >> register the QModelIndex object as a metatype, and after doing that, >> things *seemed* to work fine, but I was wondering if anyone had a >> concrete answer. Don't do that. Objects that interact with the GUI, need to live in the GUI thread. With Qt 2, that becomes a bit different, but for now, I guess you should stick to that adagium.
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