qt treeview过滤

Posted 2020-10-08 wonderfulday

一，不多说直接上代码

QSortFilterProxyModel可实现过滤排序。但是如果直接使用只能对于父项进行过滤

这里需要继承

头文件

#include <QSortFilterProxyModel>

class TreeProxyFilter:public QSortFilterProxyModel

{

public:

    TreeProxyFilter(QObject *parent = Q_NULLPTR);

protected:

    bool filterAcceptsRow(int sourceRow,const QModelIndex &sourceParent) const;

private:

   bool ShowThis(const QModelIndex index) const;

};
cpp文件

bool TreeProxyFilter::filterAcceptsRow(int sourceRow,

                   const QModelIndex &sourceParent) const

{

    QModelIndex index = sourceModel()->index(sourceRow, 0, sourceParent);

    return ShowThis(index);

}

bool TreeProxyFilter::ShowThis(const QModelIndex index) const

{

    bool retVal = false;

    //Gives you the info for number of childs with a parent

    if ( sourceModel()->rowCount(index) > 0 )

    {

        for( int nChild = 0; nChild < sourceModel()->rowCount(index); nChild++)

        {

            QModelIndex childIndex = sourceModel()->index(nChild,0,index);

            if ( ! childIndex.isValid() )

                break;

            retVal = ShowThis(childIndex);

            if (retVal)

            {

                break;

            }

        }

    }

    else

    {

        QModelIndex useIndex = sourceModel()->index(index.row(), 0, index.parent());

        QString type = sourceModel()->data(useIndex, Qt::DisplayRole).toString();

        if (!type.contains(filterRegExp()))

        {

            retVal = false;

        }

        else

        {

            retVal = true;

        }

    }

    return retVal;

}
重写filterAcceptsRow方法，在该方法里对过滤项进行筛选。

二。使用
    proxyModel = new TreeProxyFilter(this);

    proxyModel->setSourceModel(model);

    proxyModel->setFilterKeyColumn(0);

    connect(ui->filterLineEdit, SIGNAL(textChanged(const QString &)),

            this, SLOT(factorFilter()));

    ui->treeView->setModel(proxyModel);