QItemSelectionModel獲取QModelIndexList程序崩潰

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轉載：https://blog.csdn.net/ljqiankun/article/details/50970423

在項目中使用QT的QItemSelectionModel獲取QModelIndexList時程序崩潰。

使用場景：

QItemSelectionModel *selections =pTreeView->selectionModel();
QModelIndexList selectedindexes = selections->selectedRows();

這樣調用後就會報錯。

 

解決方法：找到selectedRows的源碼，自己實現當前選中項

    QItemSelectionModel *selections = pTreeView->selectionModel();

    QModelIndexList selectedindexes;
    //the QSet contains pairs of parent modelIndex
    //and row number
    QSet<QPair<QModelIndex, int>> rowsSeen;

    const QItemSelection ranges = selections->selection();
    for (int i = 0; i < ranges.count(); ++i)
    {
        const QItemSelectionRange& range = ranges.at(i);
        QModelIndex parent = range.parent();
        for (int row = 0; i < range.top(); row <= range.bottom(); row++)
        {
            QPair<QModelIndex, int> rowDef = qMakePair(parent, row);
            if (!rowsSeen.contains(rowDef))
            {
                rowsSeen << rowDef;
                if (selections->isRowSelected(row, parent))
                {
                    selectedindexes.append(pModel->index(row, 0, parent));
                }
            }
        }
    }