Cocos2d-x之KeyboardEvent键盘事件

Cocos2d-x在ubuntu上的开发环境搭建，请参考《Ubuntu18.04搭建Cocos2d开发环境》

在Linux上运行项目，请参考《在Linux上运行Cocos2d-x项目》

在游戏所在目录的Classes目录下创建以下两个文件：
KeyboardScene.h:

#include "cocos2d.h"

class KeyboardScene : public cocos2d::Layer{
public:
    static cocos2d::Scene* createScene();
    virtual bool init();
    CREATE_FUNC(KeyboardScene);
};

KeyboardScene.cpp:

//
// Created by kyun on 20-3-19.
//

#include "KeyboardScene.h"

USING_NS_CC;

Scene* KeyboardScene::createScene() {
    auto scene = Scene::create();
    auto layer = KeyboardScene::create();
    scene->addChild(layer);
    return scene;
}

bool KeyboardScene::init() {
    if( !Layer::init()){
        return false;
    }

    // 创建一个精灵
    auto sprite = Sprite::create("HelloWorld.png");
    // 将精灵定位到场景中央
    sprite->setPosition(this->getContentSize().width/2,this->getContentSize().height/2);
    this->addChild(sprite,0);

    // 创建键盘监听器
    auto eventListener = EventListenerKeyboard::create();
    // 定义键盘按下处理函数
    eventListener->onKeyPressed = [](EventKeyboard::KeyCode keyCode, Event* event){
        Vec2 loc = event->getCurrentTarget()->getPosition();
        switch (keyCode){
            // 按下向左箭头，或A键
            case EventKeyboard::KeyCode ::KEY_LEFT_ARROW:
            case EventKeyboard::KeyCode ::KEY_A:
                // 将与事件绑定的精灵向左移，按一下，移一下
                event->getCurrentTarget()->setPosition(--loc.x,loc.y);
                break;
            // 按下向右箭头，或D键
            case EventKeyboard::KeyCode ::KEY_RIGHT_ARROW:
            case EventKeyboard::KeyCode ::KEY_D:
                // 将与事件绑定的精灵向右移，按一下，移一下
                event->getCurrentTarget()->setPosition(++loc.x,loc.y);
                break;
            // 按下向上箭头，或W键
            case EventKeyboard::KeyCode ::KEY_UP_ARROW:
            case EventKeyboard::KeyCode ::KEY_W:
                // 将与事件绑定的精灵向上移，按一下，移一下
                event->getCurrentTarget()->setPosition(loc.x,++loc.y);
                break;
            // 按下向下箭头，或S键
            case EventKeyboard::KeyCode ::KEY_DOWN_ARROW:
            case EventKeyboard::KeyCode ::KEY_S:
                // 将与事件绑定的精灵向下移，按一下，移一下
                event->getCurrentTarget()->setPosition(loc.x,--loc.y);
                break;

        }
    };
    // 将事件监听器与精灵进行绑定
    this->_eventDispatcher->addEventListenerWithSceneGraphPriority(eventListener,sprite);
}

修改根目录下的CMakeLists.txt文件：

# add cross-platforms source files and header files 
list(APPEND GAME_SOURCE
     Classes/AppDelegate.cpp
	 Classes/KeyboardScene.cpp
     )
list(APPEND GAME_HEADER
     Classes/AppDelegate.h
	 Classes/KeyboardScene.h
     )

执行cmake命令：

~/Desktop/Games/MyGame/build/linux-build$ cmake ../..

编译源码：

~/Desktop/Games/MyGame/build/linux-build$ make -j 4

运行游戏：

~/Desktop/Games/MyGame/build/linux-build$ cd bin/MyGame
~/Desktop/Games/MyGame/build/linux-build/bin/MyGame$ ./MyGame

测试：

通过键盘WASD四个键或四个方向键来移动精灵。

谢谢阅读！