How to unite several models into one? - c++

Question

I've created two models and now it's need to be united in one.
Both of them are inheriting QAbstractListModel and contains only roles and simple data as QVector<QMap<..., ...>> backing; what I pass to data() function
There's any way to unite them into one model and pass to Qml page through delegate?
Here my models:
ExtraModel
#include "extramodel.h"
ExtraModel::ExtraModel(QObject *parent) : QAbstractListModel(parent)
{
QMap<QString, QString> element;
element.insert("SimpleText", "Hello, world!");
backing.append(element);
element.clear();
}
QHash<int, QByteArray> ExtraModel::roleNames() const
{
QHash<int, QByteArray> roles;
roles[SimpleTextRole] = "SimpleText";
return roles;
}
QVariant ExtraModel::data(const QModelIndex &index, int role) const
{
if(role == SimpleTextRole)
return backing[index.row()].value("SimpleText");
}
MainModel (here I am trying to pass ExtraModel to MainModel)
#include <mainmodel.h>
#include <extramodel.h>
MainModel::MainModel(QObject *parent) : QAbstractListModel(parent)
{
ExtraModel *extra;
QMap<QString, QHash<int, QByteArray>> element;
element.insert("Role", extra->roleNames());
backing.append(element);
element.clear();
}
QHash<int, QByteArray> MainModel::roleNames() const
{
QHash<int, QByteArray> roles;
roles[ModelRole] = "Role";
return roles;
}
QVariant MainModel::data(const QModelIndex &index, int role) const
{
if (role == ModelRole)
return backing[index.row()].value("Role");
return QVariant();
}
That's how I want it to be in .qml file
import QtQuick 2.6
import Sailfish.Silica 1.0
import MainModel 1.0
Page {
SilicaListView {
model: MainModel {
id: _mainModel
}
delegate: Rectangle {
Text {
id: _simpleText
text: _mainModel.[someRoleNameFromExtraModel].SimpleText
}
}
}
}

Answer 1

You are probably better of writing a plain class with Q_PROPERTY to ExtraModel
class MainModel : public QObject {
Q_OBJECT
Q_PROPERTY(ExtraModel* extra READ extraModel CONSTANT)
public:
MainModel();
ExtraModel* extraModel() const { return extraModel_; }
private:
ExtraModel* extraModel_ = nullptr;
};
cpp file:
MainModel::MainModel(QObject *parent)
: QObject(parent)
, extraModel_(new ExtraModel(this))
{
}
Then your QML will look like this:
import QtQuick 2.6
import Sailfish.Silica 1.0
import MainModel 1.0
Page {
MainModel {
id: _mainModel
}
SilicaListView {
id: _mainModelView
model: _mainModel.extra
delegate: Rectangle {
Text {
id: _simpleText
text: simpleText
}
}
}
}
BTW, you should also change the rolenames to be uncapitalized for the first letter:
QHash<int, QByteArray> ExtraModel::roleNames() const
{
return {
{SimpleTextRole, "simpleText"},
};
}