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 = 0);
      ~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     }
  }