how to justfy a node is leaf node or not

In the example simpletreemodel of Qt4.3.1,how to justfy a node is leaf node or not?
view =new QTreeView();
class TreeModel : public QAbstractItemModel
{
}
class TreeItem
{
}

If the node doesnt have any children, then it is a leaf, isnt it ??
Are you talking in terms of populating the tree, or evaluating from a tree if the node is leaf or not ?

When I double click the tree,I want to justfy the selected node is a leaf one or not.
In the class QModelIndex,I don't know how to get the child number of QModelIndex?

Code:

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void QAbstractItemView::doubleClicked ( const QModelIndex & index )

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What are you using ? Model/View or QTreeWidget ?
If you are using model/view you can query QModelIndex::child(0,0)

If it returns a valid QModelIndex, you will know that this has some child. You can be sure because if it has child, firstt will be on row 0, col 0 .

Hope this helps :)

or you can use QAbstractItemModel::rowCount ( const QModelIndex & parent = QModelIndex() ) const which gives you number of rows for which parent is a parent :]

Code:

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index.model()->rowCount(index);

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