Cocos2d-x事件探究
不多说，上源码，setFrameSize这个函数大家都比较熟悉吧，没错，main函数中的关键函数，定义了游戏窗口的大小，但是它可不只是定义窗口大小的。
void CCEGLView::setFrameSize(float width, float height) { bool eResult = false; int u32GLFWFlags = GLFW_WINDOW; //create the window by glfw. //check CCAssert(width!=0&&height!=0, "invalid window's size equal 0"); //Inits GLFW eResult = glfwInit() != GL_FALSE; if (!eResult) { CCAssert(0, "fail to init the glfw"); } /* Updates window hint */ glfwOpenWindowHint(GLFW_WINDOW_NO_RESIZE, GL_TRUE); int iDepth = 16; // set default value /* Depending on video depth */ switch(iDepth) { /* 16-bit */ case 16: { /* Updates video mode */ eResult = (glfwOpenWindow(width, height, 5, 6, 5, 0, 16, 8, (int)u32GLFWFlags) != false) ? true : false; break; } /* 24-bit */ case 24: { /* Updates video mode */ eResult = (glfwOpenWindow(width, height, 8, 8, 8, 0, 16, 8, (int)u32GLFWFlags) != false) ? true : false; break; } /* 32-bit */ default: case 32: { /* Updates video mode */ eResult = (glfwOpenWindow(width, height, 8, 8, 8, 8, 16, 8, (int)u32GLFWFlags) != GL_FALSE) ? true :false; break; } } /* Success? */ if(eResult) { /* Updates actual size */ // glfwGetWindowSize(&width, &height); CCEGLViewProtocol::setFrameSize(width, height); /* Updates its title */ glfwSetWindowTitle("Cocos2dx-Linux"); //set the init flag bIsInit = true; //register the glfw key event glfwSetKeyCallback(keyEventHandle); //register the glfw char event glfwSetCharCallback(charEventHandle); //register the glfw mouse event glfwSetMouseButtonCallback(mouseButtonEventHandle); //register the glfw mouse pos event glfwSetMousePosCallback(mousePosEventHandle); glfwSetWindowCloseCallback(closeEventHandle); //Inits extensions eResult = initExtensions(); if (!eResult) { CCAssert(0, "fail to init the extensions of opengl"); } initGL(); } }
glfwSetMouseButtonCallback(mouseButtonEventHandle);这个函数就是一个回调，在鼠标落下的时候回调。再往下看mouseButtonEventHandle函数
void mouseButtonEventHandle(int iMouseID,int iMouseState) { if (iMouseID == GLFW_MOUSE_BUTTON_LEFT) { CCEGLView* pEGLView = CCEGLView::sharedOpenGLView(); //get current mouse pos int x,y; glfwGetMousePos(&x, &y); CCPoint oPoint((float)x,(float)y); /* if (!CCRect::CCRectContainsPoint(s_pMainWindow->m_rcViewPort,oPoint)) { CCLOG("not in the viewport"); return; } */ oPoint.x /= pEGLView->m_fFrameZoomFactor; oPoint.y /= pEGLView->m_fFrameZoomFactor; int id = 0; if (iMouseState == GLFW_PRESS) { pEGLView->handleTouchesBegin(1, &id, &oPoint.x, &oPoint.y); } else if (iMouseState == GLFW_RELEASE) { pEGLView->handleTouchesEnd(1, &id, &oPoint.x, &oPoint.y); } } }
再向下看
void CCEGLViewProtocol::handleTouchesBegin(int num, int ids[], float xs[], float ys[]) { CCSet set; for (int i = 0; i < num; ++i) { int id = ids[i]; float x = xs[i]; float y = ys[i]; CCInteger* pIndex = (CCInteger*)s_TouchesIntergerDict.objectForKey(id); int nUnusedIndex = 0; // it is a new touch if (pIndex == NULL) { nUnusedIndex = getUnUsedIndex(); // The touches is more than MAX_TOUCHES ? if (nUnusedIndex == -1) { CCLOG("The touches is more than MAX_TOUCHES, nUnusedIndex = %d", nUnusedIndex); continue; } CCTouch* pTouch = s_pTouches[nUnusedIndex] = new CCTouch(); pTouch->setTouchInfo(nUnusedIndex, (x - m_obViewPortRect.origin.x) / m_fScaleX, (y - m_obViewPortRect.origin.y) / m_fScaleY); //CCLOG("x = %f y = %f", pTouch->getLocationInView().x, pTouch->getLocationInView().y); CCInteger* pInterObj = new CCInteger(nUnusedIndex); s_TouchesIntergerDict.setObject(pInterObj, id); set.addObject(pTouch); pInterObj->release(); } } if (set.count() == 0) { CCLOG("touchesBegan: count = 0"); return; } m_pDelegate->touchesBegan(&set, NULL); }
再向下看
void CCTouchDispatcher::touchesBegan(CCSet *touches, CCEvent *pEvent) { if (m_bDispatchEvents) { this->touches(touches, pEvent, CCTOUCHBEGAN); } }
// // dispatch events // void CCTouchDispatcher::touches(CCSet *pTouches, CCEvent *pEvent, unsigned int uIndex) { CCAssert(uIndex >= 0 && uIndex < 4, ""); CCSet *pMutableTouches; m_bLocked = true; // optimization to prevent a mutable copy when it is not necessary unsigned int uTargetedHandlersCount = m_pTargetedHandlers->count(); unsigned int uStandardHandlersCount = m_pStandardHandlers->count(); bool bNeedsMutableSet = (uTargetedHandlersCount && uStandardHandlersCount); pMutableTouches = (bNeedsMutableSet ? pTouches->mutableCopy() : pTouches); struct ccTouchHandlerHelperData sHelper = m_sHandlerHelperData[uIndex]; // // process the target handlers 1st // if (uTargetedHandlersCount > 0) { CCTouch *pTouch; CCSetIterator setIter; for (setIter = pTouches->begin(); setIter != pTouches->end(); ++setIter) { pTouch = (CCTouch *)(*setIter); CCTargetedTouchHandler *pHandler = NULL; CCObject* pObj = NULL; CCARRAY_FOREACH(m_pTargetedHandlers, pObj) { pHandler = (CCTargetedTouchHandler *)(pObj); if (! pHandler) { break; } bool bClaimed = false; if (uIndex == CCTOUCHBEGAN) { bClaimed = pHandler->getDelegate()->ccTouchBegan(pTouch, pEvent); if (bClaimed) { pHandler->getClaimedTouches()->addObject(pTouch); } } else if (pHandler->getClaimedTouches()->containsObject(pTouch)) { // moved ended canceled bClaimed = true; switch (sHelper.m_type) { case CCTOUCHMOVED: pHandler->getDelegate()->ccTouchMoved(pTouch, pEvent); break; case CCTOUCHENDED: pHandler->getDelegate()->ccTouchEnded(pTouch, pEvent); pHandler->getClaimedTouches()->removeObject(pTouch); break; case CCTOUCHCANCELLED: pHandler->getDelegate()->ccTouchCancelled(pTouch, pEvent); pHandler->getClaimedTouches()->removeObject(pTouch); break; } } if (bClaimed && pHandler->isSwallowsTouches()) { if (bNeedsMutableSet) { pMutableTouches->removeObject(pTouch); } break; } } } } // // process standard handlers 2nd // if (uStandardHandlersCount > 0 && pMutableTouches->count() > 0) { CCStandardTouchHandler *pHandler = NULL; CCObject* pObj = NULL; CCARRAY_FOREACH(m_pStandardHandlers, pObj) { pHandler = (CCStandardTouchHandler*)(pObj); if (! pHandler) { break; } switch (sHelper.m_type) { case CCTOUCHBEGAN: pHandler->getDelegate()->ccTouchesBegan(pMutableTouches, pEvent); break; case CCTOUCHMOVED: pHandler->getDelegate()->ccTouchesMoved(pMutableTouches, pEvent); break; case CCTOUCHENDED: pHandler->getDelegate()->ccTouchesEnded(pMutableTouches, pEvent); break; case CCTOUCHCANCELLED: pHandler->getDelegate()->ccTouchesCancelled(pMutableTouches, pEvent); break; } } } if (bNeedsMutableSet) { pMutableTouches->release(); } // // Optimization. To prevent a [handlers copy] which is expensive // the add/removes/quit is done after the iterations // m_bLocked = false; if (m_bToRemove) { m_bToRemove = false; for (unsigned int i = 0; i < m_pHandlersToRemove->num; ++i) { forceRemoveDelegate((CCTouchDelegate*)m_pHandlersToRemove->arr[i]); } ccCArrayRemoveAllValues(m_pHandlersToRemove); } if (m_bToAdd) { m_bToAdd = false; CCTouchHandler* pHandler = NULL; CCObject* pObj = NULL; CCARRAY_FOREACH(m_pHandlersToAdd, pObj) { pHandler = (CCTouchHandler*)pObj; if (! pHandler) { break; } if (dynamic_cast<CCTargetedTouchHandler*>(pHandler) != NULL) { forceAddHandler(pHandler, m_pTargetedHandlers); } else { forceAddHandler(pHandler, m_pStandardHandlers); } } m_pHandlersToAdd->removeAllObjects(); } if (m_bToQuit) { m_bToQuit = false; forceRemoveAllDelegates(); } }
好了，事件已经派发到了没一个节点上面。cocos2d-x的事件机制就是这样的了。
