QML之全局变量

C++形式

• 根据功能定义不同类，例如:程序设置类：

    class Settings : public QObject{
      Q_OBJECT
    public:
      Q_PROPERTY(QString appName MEMBER m_appName)
    private:
      QString m_appName = "MyApp";
    }
  

• 和网络类：

    class Networks : public QObject{
    	 Q_OBJECT
    }
  

• 定义一个总的类：

   class GlobalObject : public QObject{
     Q_OBJECT 
   public:
     Q_PROPERTY(Settings* settings MEMBER m_settings)
     Q_PROPERTY(Networks* networks MEMBER m_networks) 
   private:
     Settings* m_settings;
     Networks* m_networks; 
   }
  

• 在main函数中创建总类的对象：

   auto globalObject = new GlobalObject();
  

• 在QQmlEngine构建之后还未加载任何QML文件之前，将该对象设置为执行上下文对象：

    engine->rootContext()->setContextObject(globalObject);