键盘事件

对于桌面游戏,一般需要通过键盘做一些游戏内的控制,这时你就需要监听键盘事件。Cocos2d-x 支持键盘事件,就像上节介绍的触摸事件一样。

创建键盘事件监听器:

C++

  1. // creating a keyboard event listener
  2. auto listener = EventListenerKeyboard::create();
  3. listener->onKeyPressed = CC_CALLBACK_2(KeyboardTest::onKeyPressed, this);
  4. listener->onKeyReleased = CC_CALLBACK_2(KeyboardTest::onKeyReleased, this);
  5. _eventDispatcher->addEventListenerWithSceneGraphPriority(listener, this);
  6. // Implementation of the keyboard event callback function prototype
  7. void KeyboardTest::onKeyPressed(EventKeyboard::KeyCode keyCode, Event* event)
  8. {
  9. log("Key with keycode %d pressed", keyCode);
  10. }
  11. void KeyboardTest::onKeyReleased(EventKeyboard::KeyCode keyCode, Event* event)
  12. {
  13. log("Key with keycode %d released", keyCode);
  14. }

可以看到,在使用键盘事件监听器时,可以监听两种不同的事件,每一个事件都有自己的触发时机。

两种事件及触发时机:

  • onKeyPressed 按键被按下时
  • onKeyReleased 按下状态的按键被放开时

原文: http://docs.cocos.com/cocos2d-x/manual/zh/event_dispatcher/keyboard.html