quick-cocos2d-x里的MVC

标题有点大。内容有点水哈。最近app上架，空闲时间比较多，于是开始重构代码。发现重构是件很好玩的事情，可以把以前看过的设计模式实验一番。可惜水平有点浅，所以高手就回避吧。

看过一本书，叫《cocos2d-x高级开发教程－制作自己的捕鱼达人》。里面有个观点是，scene应该是MVC里面的control层。后来想了想还是挺有道理的，这几天就实践了一把。其实cocos2d-x有自己的图形界面工具，但是实际的做法很简单，我也懒得去学（也可能是我闭门造车哈）。quick里面的MVC 还是很简单的，scene来处理业务逻辑，UI可以用数据驱动。

首先将生成UI的数据写到lua table中，格式如下：

local firstLogin = {
    class = "CCNode",
    name = "root",
    childrens = {
        {
            name = "loginMenu", class = "CCMenu", 
            items = {
                {name = "loginBg", class = "ImageMenuItem", 
                    options = {
                        image = {class = "CCSprite9Scale", file = "res/ui030_1_2.png", size = CCSize(275, 75)}, 
                        imageSelected = {class = "CCSprite9Scale", file = "res/ui030_1_8.png", size = CCSize(275, 75)},
                        tag = 11, pos = CCPoint(172, display.height - 408)
                    }
                },
                {name = "registBg", class = "ImageMenuItem", 
                    options = {
                        image = {class = "CCSprite9Scale", file = "res/ui030_1_2.png", size = CCSize(275, 75)}, 
                        imageSelected = {class = "CCSprite9Scale", file = "res/ui030_1_8.png", size = CCSize(275, 75)},
                        tag = 13, pos = CCPoint(467, display.height - 408)
                    }
                },
            },
            tag = 1112
        },
        {
            name="label1", class="UILabel", 
            options={text="登录",size=30,color=ccc3(255, 255, 255)},
            pivot="center", x=172, y=display.height - 410, tag=10
        }
    },
    tag = 44
}

return firstLogin

然后去解析数据，这里用了一下工厂模式，将数据传入工厂，工厂负责解析数据，最后交由具体的车间去生产。由于层级不是固定的，存在子结点与父结点的关系。所以工厂最后用递归来写一下。生成结点代码如下(这里要注意一下，child:addTo(parent)根据tag是检索不到child的，要用tag检索就要使用parent:addChild())。

function NodeInflater:inflate_luaTable(param, parentNode)
    local rootNode = param

    -- 创建自己
    local node = self:createNodeFromTag(rootNode.class, rootNode)

    -- 孩子
    self:rInflate(rootNode, node)

    -- 加到父节点上去
    parentNode:addChild(node)
    return node
end

function  NodeFactory:onCreateNode(jsonNode)
    local uiNode
    local className = jsonNode.class

    -- 判断控件的类型
    if "UIImage" == className then
        -- sprite
        uiNode = self:onCreateNode_UIImage(jsonNode)
    elseif "CCNode" == className then
        -- node
        uiNode = self:onCreateNode_CCNode(jsonNode)
    elseif "UIPushButton" == className then
        -- UIPushButton
        uiNode = self:onCreateNode_UIPushButton(jsonNode)
    elseif "UILabel" == className then
        -- label
        uiNode = self:onCreateNode_UILabel(jsonNode)
    elseif "UISlider" == className then
        --slider
        uiNode = self:onCreateNode_UISlider(jsonNode)
    elseif "CCProgressTimer" == className then
        --progresstimer
        uiNode = self:onCreateNode_CCProgressTimer(jsonNode)
    elseif "CCMenu" == className then
        -- CCMenu
        uiNode = self:onCreateNode_CCMenu(jsonNode)
    elseif "CCSprite" == className then
        -- CCSprite
        uiNode = self:onCreateNode_CCSprite(jsonNode)
    elseif "CCSprite9Scale" == className then
        uiNode = self:onCreateNode_CCSprite9Scale(jsonNode)
    end
    -- 应用
    self:applyNodeAttributesByJsonNode(uiNode, jsonNode)

    return uiNode
end

最后是在scene中生成UI并添加逻辑（以menu为例），

local function loginSelected(tag)
end

    -- 生成first login
    local fileName = "app.data.FirstLoginData"
    require("app.Utils.NodeInflater"):easyRootInflater():inflate(fileName, layer)

    -- 为menu添加触摸事件
    local menuItems = layer:getChildByTag(44):getChildByTag(1112):getChildren()
    for i=1,menuItems:count() do
        menuItems:objectAtIndex(i-1):registerScriptTapHandler(loginSelected)
    end