Cocos2d-x_3.2 Demo学习

 1 bool AppDelegate::applicationDidFinishLaunching()
 2 {
 3     //.....初始化设置比如刷新频率，窗口大小等
 4 
 5     auto scene = Scene::create();
 6     auto layer = new TestController();// 主场景，显示可以测试的项目
 7 
 8     //...
 9 
10      layer->autorelease();
11      scene->addChild(layer);// 添加至场景
12      director->runWithScene(scene);// 运行场景
13      
14     return true;
15 }

 1 class TestController : public Layer
 2 {
 3 public:
 4     TestController();
 5     ~TestController();
 6 
 7     void menuCallback(Ref * sender);// 菜单回调
 8     void closeCallback(Ref * sender);// 关闭按钮回调
 9 
10     bool onTouchBegan(Touch* touches, Event  *event);// 触摸开始
11     void onTouchMoved(Touch* touches, Event  *event);// 触摸移动
12 
13     void onMouseScroll(Event *event);// 滚轮回调
14     //...
15 private:
16     Vec2 _beginPos;// 用于保存触摸开始时坐标
17     Menu* _itemMenu;// 用于滚动事临时显示的坐标
18     //...19 };

 1 TestController::TestController():_beginPos(Vec2::ZERO),_exitThread(false)
 2 {
 3     /* 添加关闭菜单 */
 4     auto closeItem = MenuItemImage::create(s_pathClose, s_pathClose, CC_CALLBACK_1(TestController::closeCallback, this) );
 5     auto menu =Menu::create(closeItem, nullptr);
 6 
 7     menu->setPosition( Vec2::ZERO );// (0,0)
 8     closeItem->setPosition(Vec2( VisibleRect::right().x - 30, VisibleRect::top().y - 30));
 9 
10     /* 添加测试菜单 */
11     TTFConfig ttfConfig("fonts/arial.ttf", /* 字号 */24);
12     _itemMenu = Menu::create();
13     for (int i = 0; i < g_testCount; ++i)// g_testCount用于测试项数目
14     {
15         auto label = Label::createWithTTF(ttfConfig, g_aTestNames[i].test_name);       
16         auto menuItem = MenuItemLabel::create(label, CC_CALLBACK_1(TestController::menuCallback, this));
17 
18         _itemMenu->addChild(menuItem, i + 10000);
19         menuItem->setPosition( Vec2( VisibleRect::center().x, (VisibleRect::top().y - (i + 1) * LINE_SPACE) ));
20     }
21     _itemMenu->setContentSize(Size(VisibleRect::getVisibleRect().size.width, (g_testCount + 1) * (LINE_SPACE)));
22     _itemMenu->setPosition(s_tCurPos);
23     addChild(_itemMenu);
24 
25     addChild(menu, 1);
26 
27     /* 注册触摸事件 */
28     auto listener = EventListenerTouchOneByOne::create();
29     listener->setSwallowTouches(true);// 设置其他层是否接受
30     listener->onTouchBegan = CC_CALLBACK_2(TestController::onTouchBegan, this);
31     listener->onTouchMoved = CC_CALLBACK_2(TestController::onTouchMoved, this);
32     _eventDispatcher->addEventListenerWithSceneGraphPriority(listener, this);// 设置监听对象
33     /* 注册滚轮事件 */
34     auto mouseListener = EventListenerMouse::create();
35     mouseListener->onMouseScroll = CC_CALLBACK_1(TestController::onMouseScroll, this);
36     _eventDispatcher->addEventListenerWithSceneGraphPriority(mouseListener, this);// 设置监听对象
37 }

#define LINE_SPACE 40 // 行距40

 1 void TestController::menuCallback(Ref * sender)
 2 {
 3     Director::getInstance()->purgeCachedData();// 移除所有 cocos2d 缓存数据
 4 
 5     auto menuItem = static_cast<MenuItem *>(sender);
 6     int idx = menuItem->getLocalZOrder() - 10000;// 获取Z顺序
 7 
 8     auto scene = g_aTestNames[idx].callback();// C++11 创建菜单项相对应的场景
 9 
10     if (scene)
11     {
12         scene->runThisTest();
13         scene->release();
14     }
15 }

 1 /* 各平台不同的关闭 */
 2 void TestController::closeCallback(Ref * sender)
 3 {
 4 #if (CC_TARGET_PLATFORM == CC_PLATFORM_WP8) || (CC_TARGET_PLATFORM == CC_PLATFORM_WINRT)
 5     MessageBox("You pressed the close button. Windows Store Apps do not implement a close button.","Alert");
 6     return;
 7 #endif
 8 
 9     Director::getInstance()->end();
10 #if (CC_TARGET_PLATFORM == CC_PLATFORM_IOS)
11     exit(0);
12 #endif
13 }

 1 bool TestController::onTouchBegan(Touch* touch, Event  *event)
 2 {
 3     _beginPos = touch->getLocation();// 获得触摸点坐标
 4     return true;
 5 }
 6 
 7 void TestController::onTouchMoved(Touch* touch, Event  *event)
 8 {
 9     auto touchLocation = touch->getLocation();    
10     float nMoveY = touchLocation.y - _beginPos.y;
11 
12     auto curPos  = _itemMenu->getPosition();// 获得菜单坐标
13     auto nextPos = Vec2(curPos.x, curPos.y + nMoveY);
14     /* 滑到最顶端禁止滑动 */
15     if (nextPos.y < 0.0f)
16     {
17         _itemMenu->setPosition(Vec2::ZERO);
18         return;
19     }
20     /* 滑动最低端禁止滑动 */
21     if (nextPos.y > ((g_testCount + 1)* LINE_SPACE - VisibleRect::getVisibleRect().size.height))
22     {
23         _itemMenu->setPosition(Vec2(0, ((g_testCount + 1)* LINE_SPACE - VisibleRect::getVisibleRect().size.height)));
24         return;
25     }
26 
27     _itemMenu->setPosition(nextPos);
28     _beginPos = touchLocation;
29     s_tCurPos   = nextPos;
30 }