相对某个控件进行布局

Size widgetSize = Director::getInstance()->getWinSize();                Text* alert = Text::create("Layout", "fonts/Marker Felt.ttf", 30 );        alert->setColor(Color3B(159, 168, 176));        alert->setPosition(Point(widgetSize.width / 2.0f,                                 widgetSize.height / 2.0f - alert->getSize().height * 3.075f));                addChild(alert);                        Layout* layout = Layout::create();        layout->setSize(Size(widgetSize.width, widgetSize.height));               //横向排列，这里相似Android里的线性布局        layout->setLayoutType(LAYOUT_RELATIVE);        /*以图片为背景*/        layout->setBackGroundImageScale9Enabled(true);        layout->setBackGroundImage("green_edit.png");                layout->setPosition(Point(0,0));        addChild(layout);                ImageView* imageView_Center = ImageView::create("scrollviewbg.png");        layout->addChild(imageView_Center);                RelativeLayoutParameter* rp_Center = RelativeLayoutParameter::create();        //给布局參数起名字，以便以后别的对象相对它布局        rp_Center->setRelativeName("rp_Center");        rp_Center->setAlign(RELATIVE_CENTER_IN_PARENT);        imageView_Center->setLayoutParameter(rp_Center);                //above center        ImageView* imageView_AboveCenter = ImageView::create("switch-mask.png");        layout->addChild(imageView_AboveCenter);                RelativeLayoutParameter* rp_AboveCenter = RelativeLayoutParameter::create();        //设置相对哪个对象布局        rp_AboveCenter->setRelativeToWidgetName("rp_Center");        rp_AboveCenter->setAlign(RELATIVE_LOCATION_ABOVE_CENTER);        imageView_AboveCenter->setLayoutParameter(rp_AboveCenter);                        //below center        ImageView* imageView_BelowCenter = ImageView::create("switch-mask.png");        layout->addChild(imageView_BelowCenter);                RelativeLayoutParameter* rp_BelowCenter = RelativeLayoutParameter::create();        rp_BelowCenter->setRelativeToWidgetName("rp_Center");        rp_BelowCenter->setAlign(RELATIVE_LOCATION_BELOW_CENTER);        imageView_BelowCenter->setLayoutParameter(rp_BelowCenter);                        //left center        ImageView* imageView_LeftCenter = ImageView::create("switch-mask.png");        layout->addChild(imageView_LeftCenter);                RelativeLayoutParameter* rp_LeftCenter = RelativeLayoutParameter::create();        rp_LeftCenter->setRelativeToWidgetName("rp_Center");        rp_LeftCenter->setAlign(RELATIVE_LOCATION_LEFT_OF_CENTER);        imageView_LeftCenter->setLayoutParameter(rp_LeftCenter);                                //right center        ImageView* imageView_RightCenter = ImageView::create("switch-mask.png");        layout->addChild(imageView_RightCenter);                RelativeLayoutParameter* rp_RightCenter = RelativeLayoutParameter::create();        rp_RightCenter->setRelativeToWidgetName("rp_Center");        rp_RightCenter->setAlign(RELATIVE_LOCATION_RIGHT_OF_CENTER);        imageView_RightCenter->setLayoutParameter(rp_RightCenter);