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:

// creating a keyboard event listener
auto listener = EventListenerKeyboard::create();
listener->onKeyPressed = CC_CALLBACK_2(KeyboardTest::onKeyPressed, this);
listener->onKeyReleased = CC_CALLBACK_2(KeyboardTest::onKeyReleased, this);

_eventDispatcher->addEventListenerWithSceneGraphPriority(listener, this);

// Implementation of the keyboard event callback function prototype
void KeyboardTest::onKeyPressed(EventKeyboard::KeyCode keyCode, Event* event)
{
        log("Key with keycode %d pressed", keyCode);
}

void KeyboardTest::onKeyReleased(EventKeyboard::KeyCode keyCode, Event* event)
{
        log("Key with keycode %d released", keyCode);
}

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

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