Display and refresh a dynamic list on QML
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Hi all,
In my application I need to create a dynamic list, I retrieved my data from json and I used QML for views.
I declare the list in main using setContextProperty as follows:
int main(int argc, char argv[])
{
QGuiApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
qputenv("QT_QUICK_CONTROLS_STYLE", "material");
QGuiApplication app(argc, argv);
ApplicationUI appui;
QQmlApplicationEngine engine;
QQmlContext context = engine.rootContext();
context->setContextProperty("myApp", &appui);//Users list
QList<User*> listuser;
listuser=u.getallUser() ;
UserEntityModel modeluser;
for(int i =0;i<listuser.size();i++ )
{
QString fullname = listuser[i]->fullname();
QString email= listuser[i]->Email();
QString grade= listuser[i]->grade();
QString evaluation = listuser[i]->evaluation();
QString photo=listuser[i]->photo();
modeluser.addUserEntity(UserEntity(fullname,email,grade,evaluation,photo));
}
context->setContextProperty("userModel", &modeluser);
engine.load(QUrl(QStringLiteral("qrc:/qml/main.qml")));
return app.exec();
}
In QML I retrieve my list as follows:
ListView {
id: listViewuser
anchors.bottomMargin: -3
anchors.leftMargin: -18
anchors.topMargin: -3
anchors.rightMargin: 5
focus: true
clip: true
anchors.fill: parent
model:userModel
delegate: userComponent
section.property: "sortGroup"
section.criteria: ViewSection.FullString
section.delegate: stateChanged
}
But when I add a new object, I need to close the application and start the new main so that the list will be refreshed in the graphical interface (QML).
While I want to refreshethe list automatically without closing the application.
I try to declare the list in a different class than the main, but in QML I got this error: "userModel undefined" . -
Hi all,
In my application I need to create a dynamic list, I retrieved my data from json and I used QML for views.
I declare the list in main using setContextProperty as follows:
int main(int argc, char argv[])
{
QGuiApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
qputenv("QT_QUICK_CONTROLS_STYLE", "material");
QGuiApplication app(argc, argv);
ApplicationUI appui;
QQmlApplicationEngine engine;
QQmlContext context = engine.rootContext();
context->setContextProperty("myApp", &appui);//Users list
QList<User*> listuser;
listuser=u.getallUser() ;
UserEntityModel modeluser;
for(int i =0;i<listuser.size();i++ )
{
QString fullname = listuser[i]->fullname();
QString email= listuser[i]->Email();
QString grade= listuser[i]->grade();
QString evaluation = listuser[i]->evaluation();
QString photo=listuser[i]->photo();
modeluser.addUserEntity(UserEntity(fullname,email,grade,evaluation,photo));
}
context->setContextProperty("userModel", &modeluser);
engine.load(QUrl(QStringLiteral("qrc:/qml/main.qml")));
return app.exec();
}
In QML I retrieve my list as follows:
ListView {
id: listViewuser
anchors.bottomMargin: -3
anchors.leftMargin: -18
anchors.topMargin: -3
anchors.rightMargin: 5
focus: true
clip: true
anchors.fill: parent
model:userModel
delegate: userComponent
section.property: "sortGroup"
section.criteria: ViewSection.FullString
section.delegate: stateChanged
}
But when I add a new object, I need to close the application and start the new main so that the list will be refreshed in the graphical interface (QML).
While I want to refreshethe list automatically without closing the application.
I try to declare the list in a different class than the main, but in QML I got this error: "userModel undefined" . -
Hi all,
In my application I need to create a dynamic list, I retrieved my data from json and I used QML for views.
I declare the list in main using setContextProperty as follows:
int main(int argc, char argv[])
{
QGuiApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
qputenv("QT_QUICK_CONTROLS_STYLE", "material");
QGuiApplication app(argc, argv);
ApplicationUI appui;
QQmlApplicationEngine engine;
QQmlContext context = engine.rootContext();
context->setContextProperty("myApp", &appui);//Users list
QList<User*> listuser;
listuser=u.getallUser() ;
UserEntityModel modeluser;
for(int i =0;i<listuser.size();i++ )
{
QString fullname = listuser[i]->fullname();
QString email= listuser[i]->Email();
QString grade= listuser[i]->grade();
QString evaluation = listuser[i]->evaluation();
QString photo=listuser[i]->photo();
modeluser.addUserEntity(UserEntity(fullname,email,grade,evaluation,photo));
}
context->setContextProperty("userModel", &modeluser);
engine.load(QUrl(QStringLiteral("qrc:/qml/main.qml")));
return app.exec();
}
In QML I retrieve my list as follows:
ListView {
id: listViewuser
anchors.bottomMargin: -3
anchors.leftMargin: -18
anchors.topMargin: -3
anchors.rightMargin: 5
focus: true
clip: true
anchors.fill: parent
model:userModel
delegate: userComponent
section.property: "sortGroup"
section.criteria: ViewSection.FullString
section.delegate: stateChanged
}
But when I add a new object, I need to close the application and start the new main so that the list will be refreshed in the graphical interface (QML).
While I want to refreshethe list automatically without closing the application.
I try to declare the list in a different class than the main, but in QML I got this error: "userModel undefined" .@jiji Do you inform the ListView that the data changed? You have to send a signal, for example the dataChanged signal. I assume, since your ListView shows data that you are already using on of Qt's models.
You can look up dataChanged in my post here:
https://forum.qt.io/topic/78802/datachange-signal-ignored-by-gridview/2And in general you can read how data can be set in a model here:
http://doc.qt.io/qt-5/qabstractitemmodel.html#setDataAlthough, you don't have to use setData, but you have to send the signal.
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Hello, dear developer! Please, use the "forceLayout()" method on your ListView. It automatically updates it in order to match the datas of the model.
Hope it helped!
