| /* |
| * Copyright 2015-present Open Networking Laboratory |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| /* |
| ONOS GUI -- Layer -- Loading Service |
| |
| Provides a mechanism to start/stop the loading animation, center screen. |
| */ |
| (function () { |
| 'use strict'; |
| |
| // injected references |
| var $log, $timeout, ts, fs; |
| |
| // constants |
| var id = 'loading-anim', |
| dir = 'data/img/loading/', |
| pfx = '/load-', |
| nImgs = 16, |
| speed = 100, |
| waitDelay = 500; |
| |
| // internal state |
| var div, |
| img, |
| th, |
| idx, |
| task, |
| wait, |
| images = []; |
| |
| function dbg() { |
| var args = Array.prototype.slice.call(arguments); |
| args.unshift('loading'); |
| fs.debug.apply(this, args); |
| } |
| |
| function preloadImages() { |
| var idx; |
| |
| function addImg(th) { |
| var img = new Image(); |
| img.src = fname(idx, th); |
| images.push(img); |
| } |
| |
| dbg('preload images start...'); |
| for (idx=1; idx<=nImgs; idx++) { |
| addImg('light'); |
| addImg('dark'); |
| } |
| dbg('preload images DONE!', images); |
| } |
| |
| function fname(i, th) { |
| var z = i > 9 ? '' : '0'; |
| return dir + th + pfx + z + i + '.png'; |
| } |
| |
| function nextFrame() { |
| idx = idx === 16 ? 1 : idx + 1; |
| img.attr('src', fname(idx, th)); |
| task = $timeout(nextFrame, speed); |
| } |
| |
| // start displaying 'loading...' animation (idempotent) |
| function startAnim() { |
| dbg('start ANIMATION'); |
| th = ts.theme(); |
| div = d3.select('#'+id); |
| if (div.empty()) { |
| div = d3.select('body').append('div').attr('id', id); |
| img = div.append('img').attr('src', fname(1, th)); |
| idx = 1; |
| task = $timeout(nextFrame, speed); |
| } |
| } |
| |
| // stop displaying 'loading...' animation (idempotent) |
| function stopAnim() { |
| dbg('*stop* ANIMATION'); |
| if (task) { |
| $timeout.cancel(task); |
| task = null; |
| } |
| d3.select('#'+id).remove(); |
| } |
| |
| // schedule function to start animation in the future |
| function start() { |
| dbg('start (schedule)'); |
| wait = $timeout(startAnim, waitDelay); |
| } |
| |
| // cancel future start, if any; stop the animation |
| function stop() { |
| if (wait) { |
| dbg('start CANCELED'); |
| $timeout.cancel(wait); |
| wait = null; |
| } |
| stopAnim(); |
| } |
| |
| // return true if start() has been called but not stop() |
| function waiting() { |
| return !!wait; |
| } |
| |
| angular.module('onosLayer') |
| .factory('LoadingService', |
| ['$log', '$timeout', 'ThemeService', 'FnService', 'WebSocketService', |
| |
| function (_$log_, _$timeout_, _ts_, _fs_, wss) { |
| $log = _$log_; |
| $timeout = _$timeout_; |
| ts = _ts_; |
| fs = _fs_; |
| |
| preloadImages(); |
| |
| var self = { |
| start: start, |
| stop: stop, |
| waiting: waiting |
| }; |
| wss._setLoadingDelegate(self); |
| return self; |
| }]); |
| |
| }()); |