QtCreator中用于C++类型的自动完成

Question

我在C++中定义了要在QML中使用的一些类。在编写代码时，我希望QtCreator自动列出C++对象的所有可用属性和函数。

下面的示例说明了这个问题:在C++中，我定义了一个Office类(带有address属性和一个sendEmail方法)。我还定义了一个公司类(有一个总部属性和一个办公室列表)。最后添加了这两个类的代码。

在main.cpp中，我添加了以下行，目的是让QML/javascript知道这些类型。

Company theCompany;
engine.rootContext()->setContextProperty("theCompany", &theCompany);
qmlRegisterType<Office>();

然而，这似乎还不够:在下面的QML代码中，我列出了哪些属性/方法是自动完成的，哪些不是

import QtQuick 2.9
import QtQuick.Window 2.2

Window {
    visible: true
    width: 640
    height: 480
    title: qsTr("Hello World")

    property var company: theCompany         //auto-completion OK
    property var hq: theCompany.headquarters //auto-completion OK
    property var hqAddress: hq.address       //auto-completion NOT OK
    property var offices: theCompany.offices //auto-completion OK
    property var firstOffice: offices[0]
    property var firstAddress:  firstOffice.address  //auto-completion NOT OK
    function update() {
        hq.sendEMail()                       //auto-completion NOT OK
    }
}

因此，问题是:我能让QML知道Office类型吗?如果是的话，怎么做？这也适用于QList<Office*>吗？

提前谢谢你，

Marc

==================================

office.h

#ifndef OFFICE_H
#define OFFICE_H

#include <QObject>

class Office : public QObject
{
    Q_OBJECT
    Q_PROPERTY(QString address MEMBER m_address NOTIFY addressChanged)
public:
    explicit Office(QObject *parent = nullptr);
    Q_INVOKABLE void sendEMail(QString message){};

signals:
    void addressChanged();

public slots:

private:
    QString m_address;
};

#endif // OFFICE_H

office.cpp

#include "office.h"

Office::Office(QObject *parent) : QObject(parent)
{

}

company.h

#ifndef COMPANY_H
#define COMPANY_H

#include <QObject>

#include "office.h"

class Company : public QObject
{
    Q_OBJECT
    Q_PROPERTY(Office* headquarters MEMBER m_headquarters NOTIFY headquartersChanged)
    Q_PROPERTY(QList<Office *> offices MEMBER m_offices NOTIFY officesChanged)
public:
    explicit Company(QObject *parent = nullptr);

signals:
    void officesChanged();
    void headquartersChanged();

public slots:
private:
    QList<Office*> m_offices;
    Office* m_headquarters;
};

#endif // COMPANY_H

company.cpp

#include "company.h"

Company::Company(QObject *parent) : QObject(parent)
{

}

main.cpp

#include <QGuiApplication>
#include <QQmlApplicationEngine>
#include <QQmlContext>

#include "company.h"

int main(int argc, char *argv[])
{
    QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
    QGuiApplication app(argc, argv);
    QQmlApplicationEngine engine;
    Company theCompany;
    engine.rootContext()->setContextProperty("theCompany", &theCompany);
    qmlRegisterType<Office*>();
    engine.load(QUrl(QStringLiteral("qrc:/main.qml")));
    if (engine.rootObjects().isEmpty())
        return -1;
    return app.exec();
}

Answer 1

我看到：

property var company: theCompany         //auto-completion OK
property var hq: theCompany.headquarters //auto-completion OK
property var hqAddress: hq.address       //auto-completion NOT OK
property var offices: theCompany.offices //auto-completion OK
property var firstOffice: offices[0]
property var firstAddress:  firstOffice.address  //auto-completion NOT OK
function update() {
    hq.sendEMail()                       //auto-completion NOT OK
}

在那里我从来没见过

property Office firstOffice

我明白了

property var firstOffice

类型var没有属性address，因此没有代码完成。

该属性仅在运行时存在。

至少对我来说，当Office注册(具有名称)并且类型为Office时，QtCreator将给我正确的代码完成。

hq也是如此--即使是作为QML文件的读者，我也不知道它的类型。为什么QtCreator应该知道这一点？

顺便说一句:与QtCreator类似，JIT也不了解这些属性，所以在方程中有一个类型的var，就不会有任何优化绑定。