17.QT键盘

• mainwindow.h

   #ifndef MAINWINDOW_H
   #define MAINWINDOW_H
  
   #include <QMainWindow>
   5 #include <QKeyEvent>
  
   namespace Ui {
   class MainWindow;
   }
  
   class MainWindow : public QMainWindow
   {
       Q_OBJECT
  
   public:
       explicit MainWindow(QWidget *parent = );
       ~MainWindow();
  
       void keyPressEvent(QKeyEvent *event);
   private:
       Ui::MainWindow *ui;
   };
  
   #endif // MAINWINDOW_H

• mainwindow.cpp

   #include "mainwindow.h"
   #include "ui_mainwindow.h"
  
   MainWindow::MainWindow(QWidget *parent) :
       QMainWindow(parent),
       ui(new Ui::MainWindow)
   {
       ui->setupUi(this);
   }
  
   MainWindow::~MainWindow()
   {
       delete ui;
   }
  
  16 void MainWindow::keyPressEvent(QKeyEvent *event)
  17 {
  18     int x = ui->pushButton->x();
  19     int y = ui->pushButton->y();
  20     switch (event->key()) {
  21     case Qt::Key_A:
  22         ui->pushButton->move(x-10,y);
  23         break;
  24     case Qt::Key_D:
  25         ui->pushButton->move(x+10,y);
  26         break;
  27     case Qt::Key_W:
  28         ui->pushButton->move(x,y-10);
  29         break;
  30     case Qt::Key_S:
  31         ui->pushButton->move(x,y+10);
  32         break;
  33     default:
  34         break;
  35     }
   }