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I wanted to know what was the best way displaying contents of a vector in a QlistView.I am fairly new to QT hence the question. The vector content changes very fast hence speed is essential. I know you could set models in QT like by setting models

QStringList list; list << "item1" << "item2" << "item3" << "item4" << "item5"; ui.listView->setModel(new QStringListModel(list));

How would i do something like that with a vector or a deque type.

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  • How fast is "very fast"? Commented Apr 2, 2013 at 17:54
  • Changes are made to the vector multiple times in a sec Commented Apr 2, 2013 at 17:58

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As Matt Philips have mentioned, it can be done by subclassing QAbstractListModel. However, simpler approach would be to convert QVector/std::vector to QList using built in QList static member:

ui.listView->setModel(new QStringListModel(QList<QString>::fromVector(yourQVector)));

or

ui.listView->setModel(new QStringListModel(QList<QString>::fromStdVector(yourStdVector)));

I doubt there would be high overhead due to that conversion, and if you can optimize significantly by sub classing QAbstractListModel...

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so, are you telling me to "change" model every time I press my add button?
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You need to subclass QAbstractListModel. This will let you use any data structure you want. To do so, you will need to implement a couple pure virtual functions, rowCount() and data(). Qt's Model/View programming framework is nice but takes some getting used to, it's probably a good idea to read over their guide.

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