dragonbones-runtime/.cache/egret-core-5.1.0/src/egret/net/native/NativeImageLoader.ts

the tools to build dragonbones file for diffrent framework

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namespace egret.native {

    /**
     * @private
     * ImageLoader 类可用于加载图像（JPG、PNG 或 GIF）文件。使用 load() 方法来启动加载。被加载的图像对象数据将存储在 ImageLoader.data 属性上 。
     */
    export class NativeImageLoader extends EventDispatcher implements ImageLoader {
        /**
         * @private
         * 使用 load() 方法加载成功的 BitmapData 图像数据。
         */
        public data:BitmapData = null;

        /**
         * @private
         * 当从其他站点加载一个图片时，指定是否启用跨域资源共享(CORS)，默认值为null。
         * 可以设置为"anonymous","use-credentials"或null,设置为其他值将等同于"anonymous"。
         */
        private _crossOrigin:string = null;

        public set crossOrigin(value:string) {
            this._crossOrigin = value;
        }

        public get crossOrigin():string {
            return this._crossOrigin;
        }

        /**
         * @private
         * 指定是否启用跨域资源共享,如果ImageLoader实例有设置过crossOrigin属性将使用设置的属性
         */
        public static crossOrigin:string = null;

        /**
         * @private
         *
         * @param url
         * @param callback
         */
        public load(url:string):void {
            this.check(url);
        }

        private check(url:string):void {
            let self = this;
            if (self.isNetUrl(url)) {//网络请求
                self.download(url);
            }
            else if (!egret_native.isFileExists(url)) {
                self.download(url);
            }
            else {
                self.loadTexture(url);
            }
        }

        private download(url:string):void {
            let self = this;
            let promise = egret.PromiseObject.create();
            promise.onSuccessFunc = function () {
                self.loadTexture(url);
            };
            promise.onErrorFunc = function () {
                self.dispatchEventWith(IOErrorEvent.IO_ERROR);
            };
            egret_native.download(url, url, promise);
        }

        private loadTexture(url:string):void {
            let self = this;
            let promise = new egret.PromiseObject();
            promise.onSuccessFunc = function (bitmapData) {
                self.data = new egret.BitmapData(bitmapData);

                self.dispatchEventWith(Event.COMPLETE);
            };
            promise.onErrorFunc = function () {
                self.dispatchEventWith(IOErrorEvent.IO_ERROR);
            };
            egret_native.Texture.addTextureAsyn(url, promise);

        }

        /**
         * 是否是网络地址
         * @param url
         * @returns {boolean}
         */
        private isNetUrl(url:string):boolean {
            return url.indexOf("http://") != -1 || url.indexOf("HTTP://") != -1 || url.indexOf("https://") != -1 || url.indexOf("HTTPS://") != -1;
        }
    }

    ImageLoader = NativeImageLoader;
}