Filter QML Model

[Schneidi]

Hello,

I use a class inheriting QAbstractListModel as model for a qml ListView.
What I need is to filter this model.

Currently I have one Model which should be used by several ListViews but
each listview is supposed to display only a subset of the model data.

I was able to filter the model by QAbstractItemModel::match() but how can I use
a QModelIndexList to pass the data subsets to the qml listviews ?

Thanks for help guys

[Schneidi]

No ideas on this one ?

Based on a QAbstractListModel how can i create subset models for a listview. I'm not able to use my Model class as return parameter to build temporary models.

[Jens]

Did you already take a look at QSortFilterProxyModel?

https://qt-project.org/doc/qt-5.1/qtcore/qsortfilterproxymodel.html

[Schneidi]

Hi jens,

I've tried to port my QAbstractListModel to a QSortFilterProxyModel.
But it keeps crashing as soon as i try to set data or accessing the ClipList m_clips member in any way.

Can the QSortFilterProxyModel provide more than one filtered model based on one set of data ? For example I need two lists based on the same model both with a different filter aktive.

@
class CoreEngine;

class ClipFilterModel : public QSortFilterProxyModel
{
Q_OBJECT

public:
ClipFilterModel(CoreEngine *parent = 0);

enum Roles {ObjectRole = Qt::UserRole, Fklz};

QHash<int, QByteArray> roleNames() const {
    QHash<int, QByteArray> roles;
    roles[ObjectRole] = "object";
    roles[Fklz] = "fklz";
    return roles;
}

QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const;

void addClip(ClipElement *clip);

int rowCount(const QModelIndex & parent = QModelIndex()) const;
void clear();

inline ClipList *getModelClipList() {return &this->m_clips;}

bool loadClipList();

private:
ClipList m_clips;

CoreEngine *core;

};
@

.cpp

@#include "clipfiltermodel.h"

#include <QtWidgets>

//! [0]
ClipFilterModel::ClipFilterModel(CoreEngine *parent)
: QSortFilterProxyModel(parent)
{
this->core = parent;
}

QVariant ClipFilterModel::data(const QModelIndex &index, int role) const {
if (!index.isValid())
return QVariant();

if (index.row() >= m_clips.size() || index.row() < 0)
    return QVariant();

if (role == Fklz)
    return QVariant::fromValue(this->m_clips.at(index.row())->getFklz());
else
    return QVariant::fromValue(this->m_clips.at(index.row()));

}

void ClipFilterModel::addClip(ClipElement *clip)
{
beginInsertRows(QModelIndex(), rowCount(), rowCount());
m_clips.append(clip);
endInsertRows();
}

int ClipFilterModel::rowCount(const QModelIndex & /* parent */) const
{
return m_clips.count();
}

void ClipFilterModel::clear()
{
beginResetModel();
this->m_clips.clear();
endResetModel();
}

bool ClipFilterModel::loadClipList()
{
beginResetModel();
this->clear();
this->m_clips.append(this->core->getDBHandle()->getClipList());
endResetModel();
return true;
}

@