keyPressedEvent错误Qt实现函数时

Question

我得到一个错误，在一个qt程序中，我试图捕获击键。在我的Qt程序keyPressedEvent功能但我歌厅一个奇怪的错误：

frenzywindow.cpp:16:50: error: no 'void FrenzyWindow::keyPressEvent(QKeyEvent*)' member function declared in class 'FrenzyWindow' 
make: *** [frenzywindow.o] Error 1 

的类继承的QMainWindow

继承人我的头文件：

#ifndef FRENZYWINDOW_H 
#define FRENZYWINDOW_H 

#include <QMainWindow> 
#include "frenzy.h" 

namespace Ui { 
class FrenzyWindow; 
} 

class FrenzyWindow : public QMainWindow 
{ 
    Q_OBJECT 

public: 
    explicit FrenzyWindow(QWidget *parent = 0); 
    ~FrenzyWindow(); 

signals: 
    void moveUp(); 
    void moveDown(); 
    void moveLeft(); 
    void moveRight(); 


private: 
    Ui::FrenzyWindow *ui; 
    Frenzy f; 
}; 

#endif // FRENZYWINDOW_H 

这里是我的CPP文件：

#include "frenzywindow.h" 
#include "ui_frenzywindow.h" 

FrenzyWindow::FrenzyWindow(QWidget *parent) : 
    QMainWindow(parent), 
    ui(new Ui::FrenzyWindow) 
{ 
    ui->setupUi(this); 
} 

FrenzyWindow::~FrenzyWindow() 
{ 
    delete ui; 
} 

void FrenzyWindow::keyPressEvent(QKeyEvent *event) 
{ 

    switch(event->key()) 
    { 
    case Qt::UpArrow: 
     emit moveUp(); 
     break; 
    case Qt::DownArrow: 
     emit moveDown(); 
     break; 
    case Qt::LeftArrow: 
     emit moveLeft(); 
     break; 
    case Qt::RightArrow: 
     emit moveRight(); 
     break; 
    default: 
      event->ignore(); 
      break; 

    } 
} 

Answer 1

您是否看过编译器错误？这正是问题所在。您需要在头文件中定义keyPressEvent。

protected: 
    void keyPressEvent(QKeyEvent *event);