原文请猛戳:
http://galoisplusplus.coding.me/blog/2014/11/18/touchable-tableviewcell-in-cocos2d-x/
再次来聊一聊cocos2d-x的TableView
。之前之所以用继承TableView
的方式实现2D的GridView
是因为用到TableView
点击事件的地方涉及到全局数据的复杂处理,这块处理放到TableViewDelegate
类的tableCellTouched
比较合理。但这个函数在cell被点击时都会被调用,而实际游戏里一个cell往往只有部分UI才能被点击(所以当点击事件只与这个cell的数据相关时,直接把点击事件处理放到cell内部实现才是王道),故而我们需要对cell的点击区域做进一步的限制。为此,我封装了一个TableViewCell
的子类来实现这一功能:
TouchableTableViewCell::TouchableTableViewCell(): isValidTouched_(false),touchableNode_(nullptr) {} TouchableTableViewCell::~TouchableTableViewCell() {} bool TouchableTableViewCell::init() { if (!TableViewCell::init()) { return false; } return true; } void TouchableTableViewCell::initTouchListener() { auto touchListener = EventListenerTouchOneByOne::create(); CC_SAFE_RETAIN(touchListener); Rect validTouchedRect; validTouchedRect.size = touchableNode_->getContentSize(); touchListener->onTouchBegan = [=] (cocos2d::Touch* touch,cocos2d::Event* event) { if (touchableNode_ == nullptr) { return false; } auto touchLocation = touch->getLocation(); auto localLocation = touchableNode_->convertToNodeSpace(touchLocation); if (validTouchedRect.containsPoint(localLocation)) { isValidTouched_ = true; return true; } else { isValidTouched_ = false; return false; } }; touchListener->onTouchMoved = [=] (cocos2d::Touch* touch,cocos2d::Event* event) { auto touchLocation = touch->getLocation(); auto localLocation = touchableNode_->convertToNodeSpace(touchLocation); if (validTouchedRect.containsPoint(localLocation)) { isValidTouched_ = true; } else { isValidTouched_ = false; } }; touchListener->onTouchEnded = touchListener->onTouchMoved; touchListener->onTouchCancelled = touchListener->onTouchEnded; _eventDispatcher->addEventListenerWithSceneGraPHPriority(touchListener,this); } void TouchableTableViewCell::setTouchableNode(cocos2d::Node* touchableNode) { touchableNode_ = touchableNode; initTouchListener(); }
使用时只需让实际的TableViewCell
类继承TouchableTableViewCell
,在tableCellTouched
函数中判断isValidTouched_
即可。
另外,有时候我们需要让TableViewCell
响应长按事件,我在之前的TouchableTableViewCell
类上又做了一层封装,主要使用调度器来实现长按:
const std::string LongTouchableTableViewCell::SCHEDULE_KEY = "LONG_TOUCHABLE_TABLE_VIEW_CELL"; const float LongTouchableTableViewCell::LONG_TOUCH_INTERVAL = 0.2f; LongTouchableTableViewCell::LongTouchableTableViewCell(): TouchableTableViewCell(),isTouchHold_(false),isLongTouched_(false),longTouchedCallback_(nullptr) {} LongTouchableTableViewCell::~LongTouchableTableViewCell() {} bool LongTouchableTableViewCell::init() { if (!TouchableTableViewCell::init()) { return false; } return true; } void LongTouchableTableViewCell::initTouchListener() { auto touchListener = EventListenerTouchOneByOne::create(); CC_SAFE_RETAIN(touchListener); Rect validTouchedRect; validTouchedRect.size = touchableNode_->getContentSize(); touchListener->onTouchBegan = [=] (cocos2d::Touch* touch,cocos2d::Event* event) { if (touchableNode_ == nullptr) { return false; } auto touchLocation = touch->getLocation(); auto localLocation = touchableNode_->convertToNodeSpace(touchLocation); if (validTouchedRect.containsPoint(localLocation)) { isValidTouched_ = true; isTouchHold_ = true; isLongTouched_ = false; Director::getInstance()->getScheduler()->schedule([=](float) { if (isTouchHold_) { isLongTouched_ = true; if (longTouchedCallback_ != nullptr) { longTouchedCallback_(); } } Director::getInstance()->getScheduler()->unschedule(SCHEDULE_KEY,this); },this,LONG_TOUCH_INTERVAL,0.0f,false,SCHEDULE_KEY); return true; } else { isValidTouched_ = false; isTouchHold_ = false; isLongTouched_ = false; return false; } }; touchListener->onTouchMoved = [=] (cocos2d::Touch* touch,cocos2d::Event* event) { isTouchHold_ = false; isLongTouched_ = false; auto touchLocation = touch->getLocation(); auto localLocation = touchableNode_->convertToNodeSpace(touchLocation); if (validTouchedRect.containsPoint(localLocation)) { isValidTouched_ = true; } else { isValidTouched_ = false; } }; touchListener->onTouchEnded = [=] (cocos2d::Touch* touch,cocos2d::Event* event) { isTouchHold_ = false; auto touchLocation = touch->getLocation(); auto localLocation = touchableNode_->convertToNodeSpace(touchLocation); if (validTouchedRect.containsPoint(localLocation)) { isValidTouched_ = true; } else { isValidTouched_ = false; } }; touchListener->onTouchCancelled = touchListener->onTouchEnded; _eventDispatcher->addEventListenerWithSceneGraPHPriority(touchListener,this); }原文链接:https://www.f2er.com/cocos2dx/343427.html