在QQmlComponent :: beginCreate（）

Question

我正在寻找一种在QML对象树中的某些对象范围内添加属性的方法。

file.qml：

import QtQml 2.0

QtObject {
    property var test1: QtObject {
        objectName: "child1"
        property string color: environment.color
    }

    property var test2: QtObject {
        objectName: "child2"
        property string color: environment.color
    }
}

main.cpp：

#include <QtCore>
#include <QtQml>

int main(int argc, char* argv[]) {
    QCoreApplication app(argc, argv);
    QQmlEngine engine;
    QQmlComponent component(&engine,QUrl::fromLocalFile("file.qml"));
    QObject* object = component.beginCreate(engine.rootContext());
    QObject* child1 = object->findChild<QObject*>("child1", Qt::FindChildrenRecursively);
    QObject* child2 = object->findChild<QObject*>("child2", Qt::FindChildrenRecursively);

    QQmlPropertyMap env1;
    QQmlPropertyMap env2;
    env1["color"] = "green";
    env2["color"] = "blue";

    // Now I want to make object1 available for child1
    // and object2 available for child2.
    // But I can't do this:
    //    qmlContext(test1)->setContextProperty("environment", env1);
    //    qmlContext(test2)->setContextProperty("environment", env2);

    component.completeCreate();

    if (!component.errors().isEmpty()) {
        qDebug() << component.errorString();
    }

    Q_ASSERT(child1->property("color") == QString("green"));
    Q_ASSERT(child2->property("color") == QString("blue"));

    qDebug() << "It works";
}

我承认上面的例子看起来有些奇怪。这是example I posted in the Qt forum的简化版本。