Qt QML ListView not updating after model change in Qt 6.2
I'm relatively new to this, so bear with me. I've been struggling with this for a few days now and could really use some help. I'm experiencing an issue where my `ListView` is not updating correctly after changing the model in Qt 6.2. I have a `ListModel` that I populate dynamically, and it works fine when I initially set the model. However, when I add new items to the model, the `ListView` does not reflect these changes until I restart the application. I've ensured that the model emits the necessary signals, but it's still not updating. Here's a simplified version of the relevant parts of my code: **C++ Code (main.cpp)**: ```cpp #include <QGuiApplication> #include <QQmlApplicationEngine> #include <QQmlContext> #include <QStandardItemModel> int main(int argc, char *argv[]) { QGuiApplication app(argc, argv); QQmlApplicationEngine engine; QStandardItemModel *model = new QStandardItemModel(); model->appendRow(new QStandardItem("Item 1")); model->appendRow(new QStandardItem("Item 2")); engine.rootContext()->setContextProperty("myModel", model); engine.load(QUrl(QStringLiteral("qrc:/main.qml"))); return app.exec(); } ``` **QML Code (main.qml)**: ```qml import QtQuick 2.15 import QtQuick.Controls 2.15 ApplicationWindow { visible: true width: 640 height: 480 ListView { id: listView model: myModel delegate: Text { text: model.data } } Button { text: "Add Item" onClicked: { myModel.appendRow(new QStandardItem(`"Item " + (myModel.rowCount() + 1))); } } } ``` In this example, when I click the "Add Item" button, it should add a new item to the `ListView`, but it doesn't refresh the display. I have checked that `myModel.rowCount()` increases correctly, but the `ListView` remains unchanged. After some debugging, I found that the model signals are not being emitted properly. I've confirmed that the model emits `dataChanged` after adding a new item, yet the view doesn't update. I've tried forcing an update on the `ListView` by calling `listView.model = listView.model` after appending an item, but this feels like a hack and doesn't solve the issue effectively. What are the best practices to ensure that the `ListView` updates correctly when the underlying model is modified in Qt 6.2? What's the best practice here? I'm working in a Linux environment.