如何在QFileSystemModel中添加自定义行? [英] How to add custom row in QFileSystemModel?

问题描述

我正在使用QFileSystemModel通过QTreView表示文件结构.一切工作正常，但我需要在树的某个级别添加额外的一行.例如，现在是:

I am using QFileSystemModel to represent file structure through the QTreView. Everything works fine, but I need to add an additional row at some level of the tree. For example for now is:

-root

-第1行

-row2

-row3

所有这些行都映射文件系统中的文件夹/文件. 我需要:

All these rows mapping folders/files from file system. I need:

-root

-第1行

-row2

-row3

-自定义行

因此，自定义行不代表文件系统中的任何数据.我只需要在这里添加我自己的数据. 我已经从互联网上读到很多东西，人们建议使用代理模型并重新实现rowCount()，data()和flags()函数.我试图做到这一点(使用了从QSortFilterProxyModel派生的类)，但是我从来没有在data()和flags()函数中得到我的行.似乎需要从源模型中计算出来.

So custom row is not representing any data from file system. I just need to add here my own data. I have read a lot of stuff from the internet and people advice to use proxy model and reimplement rowCount(), data() and flags() functions. I tried to do that(used class derived from QSortFilterProxyModel), but I never get my row in data() and flags() functions. Seems like it takes count from source model.

QVariant AddonFilterModel::data (const QModelIndex & index, int role) const
{
    if(role == Qt::DisplayRole && index.row() == FilterModel::rowCount(index))
    {
        return QString("Add-Ons");
    }

    return FilterModel::data(index, role);
}

Qt::ItemFlags AddonFilterModel::flags(const QModelIndex & index) const
{
    if (!index.isValid())
        return 0;

    if (index.row() == FilterModel::rowCount(index))
    {
        return Qt::ItemIsEnabled | Qt::ItemIsSelectable;
    }

    return FilterModel::flags(index);
}

int AddonFilterModel::rowCount(const QModelIndex &parent) const
{
    int count = FilterModel::rowCount(parent);

    if(parent == this->getRootIndex())
    {
        return count+1;
    }
    return count;
}

使用从QAbstractProxyModel派生的类是不可接受的，因为我需要QSortFilterProxyModel()的过滤功能.

Using class derived from QAbstractProxyModel is not acceptable because I need filtering functions of QSortFilterProxyModel().

我还尝试重新实现QFileSystemModel的rowCount()以直接在模型中进行更改，但是我从QT代码中收到数组超出范围"错误.

Also I have tried to reimplement rowCount() of QFileSystemModel to make changes directly in model but I am getting "array out of range" error from QT code.

我尝试了insertRow()方法，但是它不起作用.我认为是因为QFileSystemModel是只读的.

I have tried insertRow() method but it is not working. I think because QFileSystemModel is read only.

有人遇到这个问题吗?有什么想法吗?

Did anyone face this problem? Any ideas?

推荐答案

最新答案.您必须继承Qabstractitemmodel.

Late answer. You have to subclass Qabstractitemmodel.

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