通过离子

Question

我有这个工厂用Cordova File Transfer插件管理上传文件：

app.factory('Camera', function($q) {

var url = "http://www.myurl.com";

return {
   uploadPicture: function (imgURI, fileName) {
        var q = $q.defer();

        function win(r) {
            q.resolve(r.response);
        }

        function fail(e) {
            q.reject(e);
        }

        var options = {
            fileKey: "file",
            fileName: fileName,
            chunkedMode: false,
            mimeType: "image/jpg"
        };

        var ft = new FileTransfer();
        ft.upload(imgURI, url, win, fail, options);
        return q.promise;
    }
  }
});

从我的控制器我这样使用它：

 Camera.uploadPicture(imagePath, fileName).then(function (res) {
           //Some code

        }), function (err) {
           //Some code
        }

我想从工厂取回onprogress事件，以在视图中显示上传的进度。有办法吗？