c++ - 无法将 QPushButton 信号连接到 QGraphicsView 插槽

Question

我在将 QPushButton 中的信号连接到我的 QGraphicsView 中的插槽时遇到问题。

我的按钮标题:

class Button : public QPushButton {

    Q_OBJECT

    public://public constructors / destructors

        Button(Game_state * game_state, QWidget *parent = 0);
        ~Button();

    protected://signals / slots etc QT 
        void mousePressEvent(QMouseEvent * event);//

    signals:
        void updated() { std::cout << "HELLO FROM THE UPDATED METHOD" << std::endl;}

    protected:
        Game_state * game_state;//this is the global gamestate method
        char * action_name;//this is the application name that is responsible for setting the game_state so the game controller knows what to delete / update

};

您需要 Q_Object 宏来使用插槽编译它，但是当我编译时，我总是得到一个未找到的 vtable 引用，如下所示:

Undefined symbols for architecture x86_64:
  "vtable for Button", referenced from:
      Button::~Button()in buttons.o
      Button::~Button()in buttons.o
      Button::~Button()in buttons.o
      Button::Button(Game_state*, QWidget*)in buttons.o
      Button::Button(Game_state*, QWidget*)in buttons.o

当我取出宏时，我可以很好地编译它，但是当我运行时我总是报错:

Object::connect: No such signal QPushButton::updated() in implementation/game_controller.cpp:11

我的 game_controller 扩展了 QGRaphicsView，这是我尝试连接按钮的代码:

this->button = new Button(game_state);
this->proxy = new QGraphicsProxyWidget();
this->proxy = this->scene->addWidget(this->button);

connect(this->button, SIGNAL(updated()), this, SLOT(update()));

任何帮助将不胜感激

Answer 1

保留 Q_OBJECT，moc 需要它

不要编写信号主体，moc 会为所有信号生成代码。

不处理 mousePressedEvent，处理 QAbstractButton 及其所有子类上可用的信号 clicked()