如何调用 dataChanged

发布于 2024-11-07 09:08:34 字数 383 浏览 0 评论 0原文

以下是我添加的行类。它是由代码而不是表调用的，我希望它在添加新行时正确调用 dataChanged，尽管这不起作用，但表不执行任何操作。我做错了什么？

void MyModel::add(const Person& p)
{
    people.push_back(p);

    QModelIndex top = createIndex(people.count() - 1, 0, 0);
    QModelIndex bottom = createIndex(people.count() - 1, 3, 0);

    emit dataChanged(top, bottom); // emit layoutChanged() if headers changed
}

原文

The following is my add a row class. It is called by the code, not the table and I want it to properly call dataChanged when a new row is added, although this isn't working, the table doesn't do anything.
What am I doing wrong?

void MyModel::add(const Person& p)
{
    people.push_back(p);

    QModelIndex top = createIndex(people.count() - 1, 0, 0);
    QModelIndex bottom = createIndex(people.count() - 1, 3, 0);

    emit dataChanged(top, bottom); // emit layoutChanged() if headers changed
}

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趴在窗边数星星i 2024-11-14 09:08:34

dataChanged 仅适用于现有数据，您需要调用 beginInsertRows() / endInsertRows()

void MyModel::add(const Person& p)
{
    beginInsertRows(QModelIndex(), people.count(), people.count());
    people.push_back(p);
    endInsertRows();

    QModelIndex top = createIndex(people.count() - 1, 0, 0);
    QModelIndex bottom = createIndex(people.count() - 1, 3, 0);

    emit dataChanged(top, bottom); // emit layoutChanged() if headers changed
}

应该可以。也许您甚至不需要发出 dataChanged

dataChanged works only on existing data, you need to call beginInsertRows() / endInsertRows()

void MyModel::add(const Person& p)
{
    beginInsertRows(QModelIndex(), people.count(), people.count());
    people.push_back(p);
    endInsertRows();

    QModelIndex top = createIndex(people.count() - 1, 0, 0);
    QModelIndex bottom = createIndex(people.count() - 1, 3, 0);

    emit dataChanged(top, bottom); // emit layoutChanged() if headers changed
}

That should work. May be you don't even need to emit dataChanged

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