CocoStudio: UI控件的基类Widget

CocoStudio中所有UI控件的基类都是Widget，我想在这里分析一下这个类的一些常用方法：1、继承class CC_EX_DLL Widget : public CCNodeRGBA2、addChild和addNode方法：这连个方法不同，addChild只能添加继承自Widget的控件，如Button等，而addNode可以添加不是继承自Widget的空间，如Node，layer等等。而且这里这几到两个成员变量CCArray* _widgetChildren(用于保存Widget*)和CCArray* _nodes(用于保存Node),但是最终都会添加到Widget继承的的Node上。因为可以添加两种类型的UI控件，所以很多方法都需要分别处理。所以我们在使用的时经常需要区别对待。void Widget::addChild(CCNode* child, int zOrder, int tag){    CCAssert(dynamic_cast<Widget*>(child) != NULL, "Widget only supports Widgets as children");    CCNode::addChild(child, zOrder, tag);     _widgetChildren->addObject(child);}void Widget::addNode(CCNode* node, int zOrder, int tag){    CCAssert(dynamic_cast<Widget*>(node) == NULL, "Widget only supports Nodes as renderer");    CCNode::addChild(node, zOrder, tag);    _nodes->addObject(node);}3、CCNode* Widget::getChildByTag(int aTag){    CCAssert( aTag != kCCNodeTagInvalid, "Invalid tag");        //只能获取_widgetChildren中保存的UI控件，也即是通过    //addChild方法添加的控件。    if(_widgetChildren && _widgetChildren->count() > 0)    {        CCObject* child;        CCARRAY_FOREACH(_widgetChildren, child)        {            CCNode* pNode = (CCNode*) child;            if(pNode && pNode->getTag() == aTag)                return pNode;        }    }    return NULL;}CCNode* Widget::getNodeByTag(int tag){    CCAssert( tag != kCCNodeTagInvalid, "Invalid tag");        //只能获取_nodes-中保存的UI控件，也即是通过    //addNode方法添加的控件。    if(_nodes && _nodes->count() > 0)    {        CCObject* renderer;        CCARRAY_FOREACH(_nodes, renderer)        {            CCNode* pNode = (CCNode*) renderer;            if(pNode && pNode->getTag() == tag)                return pNode;        }    }    return NULL;}4、void Widget::removeChild(CCNode *child, bool cleanup){    CCNode::removeChild(child, cleanup);    _widgetChildren->removeObject(child);}void Widget::removeNode(CCNode* node){    CCNode::removeChild(node);    _nodes->removeObject(node);}void Widget::removeAllChildren()void Widget::removeAllNodes()5、移除全部，包括添加的Widget和Node/**     * Removes this node itself from its parent node with a cleanup.     * If the node orphan, then nothing happens.     * @see `removeFromParentAndCleanup(bool)`     */    virtual void removeFromParent();6、触摸响应相关：        virtual bool onTouchBegan(CCTouch *touch, CCEvent *unused_event);    virtual void onTouchMoved(CCTouch *touch, CCEvent *unused_event);    virtual void onTouchEnded(CCTouch *touch, CCEvent *unused_event);    virtual void onTouchCancelled(CCTouch *touch, CCEvent *unused_event);