Qt：实现QAbstractItemModel的跨度 [英] Qt: Implementing span of QAbstractItemModel

问题描述

我想知道如何在Qt框架中实现自己的QAbstractItemModel :: span函数？我知道Qt5还没有实现该功能。

I was wondering how to implement a own QAbstractItemModel::span function in Qt framework? I know that Qt5 did not yet implemented that function yet.

我试图重新实现该函数为我的自写模型和利用span功能通过使用span（）。
第一次尝试没有工作。因此，我在重新实现的函数中设置了一个断点。我意识到，Qt从来没有触发该函数（断点没有命中）。

I tried to reimplement that function for my self-written model and utilize span capabilities by using span(). First try didn't work out at all. Therefore, I set a breakpoint inside that reimplemented function. I realized that Qt never triggers that function (breakpoint was not hit).

可以帮助我如何实现这个函数，所以我不必使用setSpan在视图控制器中？

Can assist me on how to implement that function, so that I do not have to use setSpan from within view controller?

推荐答案

感谢丹尼尔·卡斯特罗，我解决了以下问题：

Thanks to Daniel Castro, I solved this as the following:

重新实现QAbstractItemView的setModel：

Reimplementing setModel of QAbstractItemView:

void View_DndLinBatch::setModel(QAbstractItemModel *model)
{
    QTableView::setModel(model);

    for (int row = 0; row < this->model()->rowCount(); row++)
    {
        for (int col = 0; col < this->model()->columnCount(); col++)
        {
            QSize span = this->model()->span(this->model()->index(row, col));
            this->setSpan(row, col, span.height(), span.width());
        }
    }
}

并重新实现QAbstractItemModel的span函数：

and reimplementing span function of QAbstractItemModel:

QSize model_DndLinBatch::span(const QModelIndex &index) const
{
    if (index.column() == 0)
    {
        return QSize(2,1);
    }
    else
    {
        return QAbstractItemModel::span(index);
    }
}

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