cocos creator基础-(二十四)cc.Director与资源加载策略

//preload.js  挂载资源的脚本
cc.Class({
    extends: cc.Component,

    properties: {
        // foo: {
        //    default: null,      // The default value will be used only when the component attaching
        //                           to a node for the first time
        //    url: cc.Texture2D,  // optional, default is typeof default
        //    serializable: true, // optional, default is true
        //    visible: true,      // optional, default is true
        //    displayName: ‘Foo‘, // optional
        //    readonly: false,    // optional, default is false
        // },
        // ...

        img_array: {
            type: cc.SpriteFrame,
            default: [],
        },

        atlas_array: {
            default: [],
            type: cc.SpriteAtlas,
        },

        sound_array: {
            default: [],
            url: cc.AudioClip,
        },

        prefab_array: {
            default: [],
            type: cc.Prefab,
        },
    },

    // use this for initialization
    onLoad: function () {

    },

    // called every frame, uncomment this function to activate update callback
    // update: function (dt) {

    // },
});

//home_scene.js  预加载下个场景资源的处理脚本
cc.Class({
    extends: cc.Component,

    properties: {
        // foo: {
        //    default: null,      // The default value will be used only when the component attaching
        //                           to a node for the first time
        //    url: cc.Texture2D,  // optional, default is typeof default
        //    serializable: true, // optional, default is true
        //    visible: true,      // optional, default is true
        //    displayName: ‘Foo‘, // optional
        //    readonly: false,    // optional, default is false
        // },
        // ...

        wait: {
            type: cc.Node,
            default: null,
        },

        progress_label: {
            type: cc.Label,
            default: null,
        },
    },

    // use this for initialization
    onLoad: function () {
        this.wait.active = false;
        this.progress_label.string = "0%";
    },

    goto_roadmap: function() {
        // 你在做场景切换的时候，如果你直接切换过去，
        // 由于下一个场景一定要先加载完它所需要的资源，那么一定会卡住一段时间;
        // 会在这里加上我们的等待界面，加入，场景加载的等待场景;
        this.wait.active = true;
        cc.loader.onProgress = function(completedCount, totalCount, item){
            console.log("completedCount:" + completedCount + ",totalCount:" + totalCount);
            var per = Math.floor(completedCount * 100 / totalCount);
            this.progress_label.string = per + "%";
        }.bind(this);

        // 预加载
        cc.director.preloadScene("roadmap_scene", function() {
            cc.loader.onProgress = null;
            cc.director.loadScene("roadmap_scene");
        });
        // end 
    },

    // called every frame, uncomment this function to activate update callback
    // update: function (dt) {

    // },
});