c++ - UI在ApplicationUI外部不响应

我是新开发的BlackBerry应用程序，我很难理解它的工作原理，因为BB的开发方式与Android或iOS的开发方式不同。

这是我的问题:我创建了一个registerPage.qml和一个registerPageController(带有.hpp和.cpp)。我希望该应用程序从registerPage.qml开始，并通过qml调用我在.cpp文件中编写的一些方法。

如果我在ApplicationUI()外部创建qml文档，则页面显示良好，但按钮没有响应。

我认为用代码很容易理解:

applicationui.cpp

ApplicationUI::ApplicationUI() : QObject()
{
    m_pTranslator = new QTranslator(this);
    m_pLocaleHandler = new LocaleHandler(this);

    bool res = QObject::connect(m_pLocaleHandler, SIGNAL(systemLanguageChanged()), this, SLOT(onSystemLanguageChanged()));
    Q_ASSERT(res);
    Q_UNUSED(res);

    onSystemLanguageChanged();

    // --> OPTION 1 (what I want) <--
    /* If I init the register page here, the page is
       displayed ok, but buttons does not respond.
       The RegisterPage initialization code is below. */
    // RegisterPage registerPage;

    // --> OPTION 2 <--
    /* If I create the registerPage here, buttons respond
       but the _register param is not setted properly*/
       QmlDocument *qml = QmlDocument::create("asset:///registerPage.qml").parent(this);
       qml->setContextProperty("_register", this);

       AbstractPane *root = qml->createRootObject<AbstractPane>();
       Application::instance()->setScene(root);
}

registerPage.hpp

class RegisterPage: public QObject
{
    Q_OBJECT
public:
    RegisterPage();
    virtual ~RegisterPage() {}

    Q_INVOKABLE void initRegistration();
};

registerPage.cpp

RegisterPage::RegisterPage()
{
    /* With this initialization, buttons does not respond!!*/
    QmlDocument *qml = QmlDocument::create("asset:///registerPage.qml").parent(this);
    qml->setContextProperty("_register", this);

    // Create root object for the UI
    AbstractPane *root = qml->createRootObject<AbstractPane>();


    // Set created root object as the application scene
    Application::instance()->setScene(root);
}

void RegisterPage::initRegistration()
{
    qDebug() << "start registration!";
}

registerPage.qml

Page {
    Container {
        Button {
            text: "Accept"
            horizontalAlignment: HorizontalAlignment.Fill
            topMargin: 100.0
            appearance: ControlAppearance.Primary
            onClicked: {
                console.log("click!!")
                _register.initRegistration()
            }
        }
    }
}

如何加载qml文件，将其关联为.cpp并从qml调用函数？为什么按钮不响应？

非常感谢，如果这是BlackBerry开发的基础，则感到抱歉，但这让我发疯。

----------------

编辑过

最后，感谢@Filip Hazubski帮助我找到了最终的解决方案。

在applicationui.cpp中

QmlDocument *qml = QmlDocument::create("asset:///registerPage.qml").parent(this);
AbstractPane *root = qml->createRootObject<AbstractPane>();

RegisterPage* registerPage = new RegisterPage(this, root);
qml->setContextProperty("_register", registerPage);

Application::instance()->setScene(root);

并在registerPage.cpp中

RegisterPage::RegisterPage(QObject *parent, AbstractPane *root) : QObject(parent)
{
    phoneTextField = root->findChild<TextField*>("phoneTextField");
}

传递AbstractPane作为参数，我们可以在registerPage.cpp中找到qml元素。

谢谢!

最佳答案

我不确定，但也许我的回答会为您提供帮助。

在applicationui.cpp中，而不是:

QmlDocument *qml = QmlDocument::create("asset:///registerPage.qml").parent(this);
qml->setContextProperty("_register", this);

AbstractPane *root = qml->createRootObject<AbstractPane>();
Application::instance()->setScene(root);

尝试:

QmlDocument *qml = QmlDocument::create("asset:///registerPage.qml").parent(this);
AbstractPane *root = qml->createRootObject<AbstractPane>();

RegisterPage* registerPage = new RegisterPage(this);
qml->setContextProperty("_register", registerPage);

Application::instance()->setScene(root);

并在registerPage.hpp中

RegisterPage();

改成

RegisterPage(QObject *parent = 0);

并在registerPage.cpp中进行更改

RegisterPage::RegisterPage()
{
    /* With this initialization, buttons does not respond!!*/
    QmlDocument *qml = QmlDocument::create("asset:///registerPage.qml").parent(this);
    qml->setContextProperty("_register", this);

    // Create root object for the UI
    AbstractPane *root = qml->createRootObject<AbstractPane>();


    // Set created root object as the application scene
    Application::instance()->setScene(root);
}

至

RegisterPage::RegisterPage(QObject *parent) : QObject(parent)
{
}