about model/view programming

**Pang** · 13th December 2006, 04:17

hi,I want to subclass QAbstractItemModel class for handling the tree-like structure data . But i don't know how to inerst a new item into the "tree" at the given position.Is anyone give me some example? Thanks

**jpn** · 13th December 2006, 07:12

Check $QTDIR/examples/itemviews/simpletreemodel.

**Pang** · 13th December 2006, 09:29

thanks,But the simpletreemodel just a read only model,it can not resize the model.

**wysota** · 13th December 2006, 09:42

Qt Code:

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insertRow(rowCount(parentIndex), parentIndex);
QModelIndex ind = index(rowCount(parentIndex), column, parentIndex);
setData(ind, "value");

insertRow(rowCount(parentIndex), parentIndex);
QModelIndex ind = index(rowCount(parentIndex), column, parentIndex);
setData(ind, "value");

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where parentIndex is the model index of the parent you wish to add a child for. "Under the hood" you have to implement it as a simple modification to your internal data structures and you can see in the simpletreemodel example how to do it (just look at its code, not the app itself - the model is initialised on startup).