QAbstractListModel with QML

[A Former User]

Hello guys,

I'm struggling to get my qml to work with a QAbstractListModel.
I started using QList<QObject> models. That worked pretty good.
Except that these don't communicate any changes on the model.

So I start implementing a QAbstractListModel approach.
But it isn't going to work.

Here is my implementation:

clipmodel.h
@#include <QObject>
#include <QAbstractListModel>

#include "global_define.h"
#include "elements/clipelement.h"

class ClipModel : public QAbstractListModel
{
Q_OBJECT
public:

enum ClipElementRoles { ObjectRole = Qt::UserRole+1 };

explicit ClipModel(QObject *parent = 0);

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

void addClip(ClipElement *clip);

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

private:
ClipList m_clips; //typedef QList<QObject*> ClipList;--

signals:

public slots:

};@

clipmodel.cpp
@#include "clipmodel.h"

ClipModel::ClipModel(QObject *parent) :
QAbstractListModel(parent)
{
QHash<int, QByteArray> roles;
roles[ObjectRole] = "object";
setRoleNames(roles);
}

QVariant ClipModel::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 == Qt::DisplayRole) {
    return QVariant::fromValue(this->m_clips.at(index.row()));
}

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

}

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

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

@
ClipModel *model = new ClipModel(this);

ClipElement *temp = new ClipElement();
temp->setClipID("foo");
temp->setClipStatus("bar");
model->addClip(temp);
this->viewer.rootContext()->setContextProperty("clip_model", model);

@

The first problem with this is an build error saying:
'setRoleNames' was not declared in this scope
Ok ? what am I doing wrong here so far ?

The clipmodel is used by an ListView with the following delegate:
@Component {
id: clipDelegate
Item {
id:clipContainer
width: parent.parent.width
height: 50
Rectangle {
id:clipBackground
anchors.fill: parent
color: "red"
border.color: "black"
Text {
id: clipText
anchors.fill: parent
text: ??? #how to get the properties of the ClipElement ?
}
}
}
}@

I guess that without setting any role I wouldn't be able to get the properties of the ClipElement object.
But how am i supposed to set the roles and address the roles in qml ?

Is there any complete tutorial out there showing the combination of QML witch a QAbstractListModel ?
I found nothing that helped me here. The Qt documentation is pretty incomplete on this topic.

Thanks for help.

[A Former User]

Hi,

Take a look at https://github.com/motya/testsqlqml/blob/83c281ebd536b15bb70f49a16a6ae85d09ba4544/mytablemodel.cpp#L38

This code helped me to solve the same issue.

setRoleNames() method is obsolute, you should override roleNames() instead.

[A Former User]

hey yudjin,

thanks for that example. Yesterday I stumbled upon this one https://qt.gitorious.org/qt/qtdeclarative/source/87d0c02fab03b7d3bf2094af22465f029bcdd096:examples/quick/models/abstractitemmodel .

Both examples are pretty helpful in this case.