QTreeview filtering search

[JokerMartini]

I'm a bit new to the C++ Qt combo. I have a more solid background in C# and WPF. I want to create a treeview with filtering. The filtering would remove top level items which don't contain children that match the filter string. Below demonstrates how the results would work when a filter is used.

• Sports
  |____ Soccer
  |____ Basketball
  |____ Football
  |____ Tennis
• Teams
  |____ Cowboys
  |____ Packers
  |____ Lions
  |____ Tennessee
• Players
  |____ Ronald
  |____ Warner
  |____ Robinson

If i then searched with a filter string of 'Ten' It would result in this...

• Sports
  |____ Tennis
• Teams
  |____ Tennessee

My question may seem simple, but how can i go about doing this? Creating a simple sample like this using QtCreator. I've added my QTreeView but I'm not entirely clear on how to populate it with dummy data and then filter it.

[the_]

@JokerMartini
Maybe you should have a look at the QSortFilterProxyModel Class.

[VRonin]

Just subclass QSortFilterProxyModel

// MySorter.h
#include <QSortFilterProxyModel>
class MySorter: public QSortFilterProxyModel
{
    Q_OBJECT
public:
    MySorter(QObject *parent);
protected:
    virtual bool filterAcceptsRow(int source_row, const QModelIndex & source_parent) const override;
};

// MySorter.cpp
#include "MySorter.h"
MySorter::MySorter(QObject *parent) : QSortFilterProxyModel(parent){}
bool MySorter::filterAcceptsRow(int source_row, const QModelIndex & source_parent) const
{
     // check the current item
     bool result = QSortFilterProxyModel::filterAcceptsRow(source,source_parent);
    QModelIndex currntIndex = sourceModel()->index(source_row, 0, source_parent);
    if (sourceModel()->hasChildren(currntIndex)) {
// if it has sub items
        for (int i = 0; i < sourceModel()->rowCount(currntIndex) && !result; ++i) {
// keep the parent if a children is shown
            result = result || filterAcceptsRow(i, currntIndex);
        }
    }
    return result;
}

[mmoerdijk]

This example helped me a lot, I implemented it in python. Hereby the corresponding code:

class FilterProxyModel(QtCore.QSortFilterProxyModel):
    def __index__(self):
        super(FilterProxyModel, self).__index__(self)

    def filterAcceptsRow(self, p_int, QModelIndex):
        res = super(FilterProxyModel, self).filterAcceptsRow(p_int, QModelIndex )
        idx = self.sourceModel().index(p_int,0,QModelIndex)
        
        if self.sourceModel().hasChildren(idx):
            num_items = self.sourceModel().rowCount(idx)
            for i in xrange(num_items):
                res = res or self.filterAcceptsRow(i, idx)

        return res

I hope it helps someone els

[raven-worx]

@mmoerdijk
since Qt 5.10 there is a recursiveFilteringEnabled property on a QSortFilterProxyModel, which does exactly this.