Bind CheckBox checked-state in TableView to custom model attribute - c++

Question

I've got a QML-application containing a TableView with two columns. One of them is a CheckBox. Now I created a model derived from QAbstractTableModel. Reading data for the ordinary text-column already works but how do I sync the checked-property for my CheckBox with the model?
Currently I can't even set it checked via model. You find the relevant code below.
tablemodel.cpp
TableModel::TableModel(QObject *parent) :
QAbstractTableModel(parent)
{
list.append("test1");
list.append("test2");
}
int TableModel::rowCount(const QModelIndex &parent) const
{
Q_UNUSED(parent);
return list.count();
}
int TableModel::columnCount(const QModelIndex &parent) const
{
Q_UNUSED(parent);
return 2;
}
QVariant TableModel::data(const QModelIndex & index, int role) const {
if (index.row() < 0 || index.row() >= list.count())
return QVariant();
if (role == NameRole)
return list[index.row()]
else if (role== EnabledRole){
//list is not QList<QString>, its a custom class saving a String and a boolean for the checked state
return list[index.row()].isEnabled();
}
else {
return QVariant();
}
}
QHash<int, QByteArray> TableModel::roleNames() const {
QHash<int, QByteArray> roles;
roles[NameRole] = "name";
roles[EnabledRole] = "enabled";
return roles;
}
tablemodel.hpp
class TableModel : public QAbstractTableModel
{
Q_OBJECT
public:
enum Roles {
NameRole = Qt::UserRole + 1,
EnabledRole
};
explicit TableModel(QObject *parent = 0);
int rowCount(const QModelIndex &parent = QModelIndex()) const;
int columnCount(const QModelIndex & parent = QModelIndex()) const;
Q_INVOKABLE QVariant data (const QModelIndex & index, int role) const;
protected:
QHash<int, QByteArray> roleNames() const;
private:
QList<QString> list;
main.qml
TableView {
id: Table
model: TableModel
TableViewColumn {
role: "name"
}
TableViewColumn {
role: "enabled"
delegate: CheckBox {
//how to get the right state from the model
//checked: ??
}
}
}
main.cpp
QQmlApplicationEngine engine;
QQmlContext * context = new QQmlContext(engine.rootContext());
TableModel tableModel;
context->setContextProperty("tableModel",&tableModel);
QQmlComponent component(&engine, QUrl("qrc:///main.qml"));
QQuickWindow * window = qobject_cast<QQuickWindow*>(component.create(context));
window->show();

Answer 1

You can emit signal from qml, when clicked on checkbox; connect this signal to your model slot and do something
main.qml
TableView {
id: table
objectName: "myTable"
signal checkedChanged(int index, bool cheked)
TableViewColumn {
role: "enabled"
delegate: CheckBox {
onClicked: table.checkedChanged(styleData.row, checked);
}
}
main.cpp
QQuickItem *obj = engine.rootObjects().at(0)->findChild<QQuickItem*>(QStringLiteral("myTable"));
QObject::connect(obj,SIGNAL(checkedChanged(int,bool)),tableModel,SLOT(mySlot(int,bool)));