When using Editable ComboBox,I can NOT import QtQuick.Controls 2.2

Question

In QML Doc, there are the following:

Import Statement:

import QtQuick.Controls 2.2

Since: Qt 5.7

"ComboBox can be made editable." ...

I have latest Qt OpenSource 5.9 installed. But I can not import the QtQuick.Controls 2.2, even with the simplest qt quick project created by the project wizard. The following error is print:

qrc:/main.qml:2 module "QtQuick.Controls" version 2.2 is not installed

My code:

import QtQuick 2.7
import QtQuick.Controls 2.2
import QtQuick.Layouts 1.3

ApplicationWindow {
...

main.cpp

#include <QGuiApplication>
#include <QQmlApplicationEngine>

int main(int argc, char *argv[])
{
    QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
    QGuiApplication app(argc, argv);

    QQmlApplicationEngine engine;
    engine.load(QUrl(QLatin1String("qrc:/main.qml")));
    if (engine.rootObjects().isEmpty())
        return -1;

    return app.exec();
}

All codes are generated by Qt Creator 4.3

I work on windows 7.

Answer 1

If you have QtQuick 2.7 installed, you need to import QtQuick.Controls 2.0. The import statement in the documentation is sometimes set to the newest version.
This might happen, e.g. when a new property is introduced in a newer version (see acceptableInput)

The ComboBox per se is available since Qt5.7 and the corresponding QtQuick.Controls 2.0, but some properties have been added in QtQuick.Controls 2.2 which comes with Qt5.9.