Model in ListView: C++ to QML

spode

@
import QtQuick 1.0

Rectangle {
width: 300; height: 40

Component {
    id: delegate_grafica
    Rectangle {
        width: parent.parent.width; height: 70; color: "salmon"
        radius: 5
        Text { text: title; font.bold: true }
        Text { text: info }//see Biglietto
    }
}

    ListView {
        id: vistaDellaLista; anchors.fill: parent
        model: //as list model...boh, what should i write?
        delegate: delegate_grafica
        spacing: 4;
    }

}
@

@
#include "biglietto.h"

Biglietto::Biglietto(QString newtitle, QString newinfo)
{
QString title = newtitle;
QString info = newinfo;
}
@

with CPP file, i would to pass the model list to QML, so if i have for example this:
@
QList<Biglietto*> list;
list.append(new Biglietto("Title 1","info 1"));
list.append(new Biglietto("title 2","info 2")); //list.name = model_list.... how to do this?
@
...so i want this code is the same of this:
@
ListModel {
id: model_list
ListElement { title: "Title 1"; info: "info 1" }
ListElement { title: "title 2"; info: "info 2" }
}
@

MichK

You should derive your class from QAbstractListModel.
Override
@ QVariant data(const QModelIndex &index, int role) const;@
Declare enums in your derived class:
@
enum ERoles
{
TitleRole = Qt::UserRole + 1,
InfoRole
}
@
In your constructor:
@
QHash<int, QByteArray> roles;
roles[TitleRole] = "title";
roles[InfoRole] = "info";
setRoleNames(roles);
@
In place where you create your declarative view:
@
//QDeclarativeView* declarativeView
//DerivedModel* derivedModel
...
declarativeView->rootContext()->setContextProperty("yourQMLModelName",derivedModel);
@

spode

thank you for reply. excuse me, what is "derivedmodel"? could you explain the last method please?
this is my code:
@
void Gestore::visualizzaSchermataPrincipale()
{
QDeclarativeView* view = new QDeclarativeView;
QList<Biglietto*> lista = this->makeListWordsAlreadySaved("");
view->rootContext()->setContextProperty("model_listElements", QVariant::fromValue(lista));
view->setSource(QUrl::fromLocalFile("qml/WoerterErinnerung/main.qml"));
QObject *obj_schermataPrincipale = view->rootObject();
QObject::connect(obj_schermataPrincipale, SIGNAL(signal_visualizzaLeggimi()), this, SLOT(visualizzaLeggimi()));
QObject::connect(obj_schermataPrincipale, SIGNAL(signal_creaNuovaParola()), this, SLOT(creaNuovaParola()));
view->show();
}

void Gestore::visualizzaSchermataPrincipaleSlot()
{
this->visualizzaSchermataPrincipale();
}

QList<Biglietto*> Gestore::makeListWordsAlreadySaved(const QString FILTER) //const indicates that FILTER will not be modified in the function
{
QList<Biglietto*> lista;//pag 36
QFile file_contenente_elencoParole("C:/WoerterErinnerung/elencoParoleSalvate.txt");
if(file_contenente_elencoParole.open(QIODevice::ReadWrite | QIODevice::Append))
{
QTextStream leggi_scrivi(&file_contenente_elencoParole);
leggi_scrivi.setCodec("UTF-8");
if(FILTER.isEmpty())
{
leggi_scrivi.flush();
while(!leggi_scrivi.atEnd())
{
leggi_scrivi.flush();
QString linea = leggi_scrivi.readLine();
Biglietto *nuovoBiglietto = new Biglietto(linea.section(" ",-1), linea.section(" ", 5,5), linea.section(" ", 7, 7), linea.section(" ", 1, 1), linea.section(" ",3,3), linea.section(" ", 9, 9));
lista.append(nuovoBiglietto);
}
}
else
{
while(!leggi_scrivi.atEnd())
{
leggi_scrivi.flush();
QString linea = leggi_scrivi.readLine();
if(linea.contains(FILTER))
{
lista.append(new Biglietto(linea.section(" ",-1), linea.section(" ", 5,5), linea.section(" ", 7, 7), linea.section(" ", 1, 1), linea.section(" ",3,3), linea.section(" ", 9, 9)));
}
else
continue;
}
}
file_contenente_elencoParole.close();
return lista;
}
else
{
QMessageBox boxInof;
boxInof.setText("<font size="15">Impossibile aprire lo stream dell' archivio</font>");
boxInof.exec();
}
return lista;
}
@

main.qml
@
...
ListView { id: list_parolaSalvate; x: 9; y: 130; width: 300; height: 300; delegate: ListDelegate {} model: model_listElements }
...
@

ListDelegate.qml
@
import QtQuick 1.0

Rectangle
{
id: delegate_grafica; width: 300; height: 37; radius: 9; color: get_sfondoBiglietto; border.width: 1; border.color: "yellow"
Text { id: worttext; x: 18; y: 0; color: "black"; text: get_traduzione; font.bold: true; anchors.verticalCenterOffset: -10;
anchors.horizontalCenterOffset: -127; font.pixelSize: 15; anchors.centerIn: parent }
Text { id: deutschbeispiel; x: 18; y: 20; height: 28; color: "black"; text: get_fraseTedesco; font.pixelSize: 12 }
}
@

but there are so a lot error...could you please help me?
for example, errors are:
@
\WoerterErinnerung\gestore.cpp
mingw32-make[1]: Leaving directory `C:/Users/7-Spode/Documents/Progetti/QT/mobile/WoerterErinnerung-build-simulator'
In file included from c:\QtSDK\Simulator\Qt\mingw\include\QtDeclarative/qdeclarativecontext.h:48,
from c:\QtSDK\Simulator\Qt\mingw\include\QtDeclarative/QDeclarativeContext:1,
from ..\WoerterErinnerung\gestore.cpp:5:
c:\QtSDK\Simulator\Qt\mingw\include/QtCore/qmetatype.h: In static member function 'static int QMetaTypeId2<T>::qt_metatype_id() [with T = QList<Biglietto*>]':
c:\QtSDK\Simulator\Qt\mingw\include/QtCore/qmetatype.h:230: instantiated from 'int qMetaTypeId(T*) [with T = QList<Biglietto*>]'
c:\QtSDK\Simulator\Qt\mingw\include/QtCore/qvariant.h:457: instantiated from 'QVariant qVariantFromValue(const T&) [with T = QList<Biglietto*>]'
c:\QtSDK\Simulator\Qt\mingw\include/QtCore/qvariant.h:340: instantiated from 'static QVariant QVariant::fromValue(const T&) [with T = QList<Biglietto*>]'
..\WoerterErinnerung\gestore.cpp:30: instantiated from here
c:\QtSDK\Simulator\Qt\mingw\include/QtCore/qmetatype.h:169: error: 'qt_metatype_id' is not a member of 'QMetaTypeId<QList<Biglietto*> >'
mingw32-make[1]: *** [debug/gestore.o] Error 1
mingw32-make: *** [debug] Error 2
The process "C:\QtSDK\mingw\bin\mingw32-make.exe" exited with code 2.
Error while building project WoerterErinnerung (target: Qt Simulator)
When executing build step 'Make'
@

srikanth_trulyit

model in ListView can be a number model also. Your C++ class can supply a count and then get the required element using a at(), passing the index property.
@
MyModelClass:public QObject {
Q_OBJECT
public:
..
Q_INVOKABLE int count();
Q_INVOKABLE QVariant at(int index); // returns data at index from your model
}
@

In QML

@
ListView {
...
model: mymodel.count(); // assuming mymodel is injected as context property.
}

Component {
id: delegate
// access the required data using mymodel.at(index);
}
@