This app provides monitoring and information features for the common freifunk user and the technical stuff of a freifunk community.
Code base is taken from a TUM Practical Course project and added here to see if Freifunk Altdorf can use it.
https://www.freifunk-altdorf.de
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218 lines
6.8 KiB
218 lines
6.8 KiB
/** |
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* Copyright (c) 2015-present, Facebook, Inc. |
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* |
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* This source code is licensed under the MIT license found in the |
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* LICENSE file in the root directory of this source tree. |
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* |
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* @providesModule InteractionManager |
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* @flow |
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*/ |
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'use strict'; |
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const BatchedBridge = require('BatchedBridge'); |
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const EventEmitter = require('EventEmitter'); |
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const Set = require('Set'); |
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const TaskQueue = require('TaskQueue'); |
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const infoLog = require('infoLog'); |
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const invariant = require('fbjs/lib/invariant'); |
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/* $FlowFixMe(>=0.54.0 site=react_native_oss) This comment suppresses an error |
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* found when Flow v0.54 was deployed. To see the error delete this comment and |
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* run Flow. */ |
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const keyMirror = require('fbjs/lib/keyMirror'); |
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type Handle = number; |
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import type {Task} from 'TaskQueue'; |
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const _emitter = new EventEmitter(); |
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const DEBUG_DELAY = 0; |
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const DEBUG = false; |
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/** |
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* InteractionManager allows long-running work to be scheduled after any |
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* interactions/animations have completed. In particular, this allows JavaScript |
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* animations to run smoothly. |
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* |
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* Applications can schedule tasks to run after interactions with the following: |
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* |
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* ``` |
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* InteractionManager.runAfterInteractions(() => { |
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* // ...long-running synchronous task... |
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* }); |
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* ``` |
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* |
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* Compare this to other scheduling alternatives: |
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* |
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* - requestAnimationFrame(): for code that animates a view over time. |
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* - setImmediate/setTimeout(): run code later, note this may delay animations. |
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* - runAfterInteractions(): run code later, without delaying active animations. |
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* |
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* The touch handling system considers one or more active touches to be an |
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* 'interaction' and will delay `runAfterInteractions()` callbacks until all |
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* touches have ended or been cancelled. |
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* |
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* InteractionManager also allows applications to register animations by |
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* creating an interaction 'handle' on animation start, and clearing it upon |
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* completion: |
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* |
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* ``` |
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* var handle = InteractionManager.createInteractionHandle(); |
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* // run animation... (`runAfterInteractions` tasks are queued) |
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* // later, on animation completion: |
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* InteractionManager.clearInteractionHandle(handle); |
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* // queued tasks run if all handles were cleared |
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* ``` |
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* |
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* `runAfterInteractions` takes either a plain callback function, or a |
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* `PromiseTask` object with a `gen` method that returns a `Promise`. If a |
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* `PromiseTask` is supplied, then it is fully resolved (including asynchronous |
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* dependencies that also schedule more tasks via `runAfterInteractions`) before |
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* starting on the next task that might have been queued up synchronously |
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* earlier. |
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* |
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* By default, queued tasks are executed together in a loop in one |
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* `setImmediate` batch. If `setDeadline` is called with a positive number, then |
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* tasks will only be executed until the deadline (in terms of js event loop run |
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* time) approaches, at which point execution will yield via setTimeout, |
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* allowing events such as touches to start interactions and block queued tasks |
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* from executing, making apps more responsive. |
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*/ |
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var InteractionManager = { |
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Events: keyMirror({ |
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interactionStart: true, |
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interactionComplete: true, |
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}), |
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/** |
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* Schedule a function to run after all interactions have completed. Returns a cancellable |
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* "promise". |
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*/ |
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runAfterInteractions(task: ?Task): {then: Function, done: Function, cancel: Function} { |
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const tasks = []; |
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const promise = new Promise(resolve => { |
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_scheduleUpdate(); |
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if (task) { |
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tasks.push(task); |
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} |
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tasks.push({run: resolve, name: 'resolve ' + (task && task.name || '?')}); |
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_taskQueue.enqueueTasks(tasks); |
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}); |
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return { |
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then: promise.then.bind(promise), |
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done: (...args) => { |
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if (promise.done) { |
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return promise.done(...args); |
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} else { |
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console.warn('Tried to call done when not supported by current Promise implementation.'); |
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} |
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}, |
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cancel: function() { |
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_taskQueue.cancelTasks(tasks); |
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}, |
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}; |
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}, |
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/** |
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* Notify manager that an interaction has started. |
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*/ |
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createInteractionHandle(): Handle { |
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DEBUG && infoLog('create interaction handle'); |
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_scheduleUpdate(); |
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var handle = ++_inc; |
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_addInteractionSet.add(handle); |
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return handle; |
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}, |
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/** |
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* Notify manager that an interaction has completed. |
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*/ |
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clearInteractionHandle(handle: Handle) { |
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DEBUG && infoLog('clear interaction handle'); |
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invariant( |
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!!handle, |
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'Must provide a handle to clear.' |
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); |
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_scheduleUpdate(); |
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_addInteractionSet.delete(handle); |
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_deleteInteractionSet.add(handle); |
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}, |
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addListener: _emitter.addListener.bind(_emitter), |
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/** |
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* A positive number will use setTimeout to schedule any tasks after the |
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* eventLoopRunningTime hits the deadline value, otherwise all tasks will be |
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* executed in one setImmediate batch (default). |
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*/ |
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setDeadline(deadline: number) { |
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_deadline = deadline; |
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}, |
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}; |
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const _interactionSet = new Set(); |
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const _addInteractionSet = new Set(); |
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const _deleteInteractionSet = new Set(); |
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const _taskQueue = new TaskQueue({onMoreTasks: _scheduleUpdate}); |
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let _nextUpdateHandle = 0; |
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let _inc = 0; |
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let _deadline = -1; |
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declare function setImmediate(callback: any, ...args: Array<any>): number; |
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/** |
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* Schedule an asynchronous update to the interaction state. |
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*/ |
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function _scheduleUpdate() { |
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if (!_nextUpdateHandle) { |
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if (_deadline > 0) { |
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/* $FlowFixMe(>=0.63.0 site=react_native_fb) This comment suppresses an |
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* error found when Flow v0.63 was deployed. To see the error delete this |
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* comment and run Flow. */ |
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_nextUpdateHandle = setTimeout(_processUpdate, 0 + DEBUG_DELAY); |
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} else { |
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_nextUpdateHandle = setImmediate(_processUpdate); |
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} |
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} |
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} |
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/** |
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* Notify listeners, process queue, etc |
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*/ |
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function _processUpdate() { |
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_nextUpdateHandle = 0; |
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var interactionCount = _interactionSet.size; |
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_addInteractionSet.forEach(handle => |
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_interactionSet.add(handle) |
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); |
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_deleteInteractionSet.forEach(handle => |
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_interactionSet.delete(handle) |
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); |
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var nextInteractionCount = _interactionSet.size; |
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if (interactionCount !== 0 && nextInteractionCount === 0) { |
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// transition from 1+ --> 0 interactions |
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_emitter.emit(InteractionManager.Events.interactionComplete); |
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} else if (interactionCount === 0 && nextInteractionCount !== 0) { |
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// transition from 0 --> 1+ interactions |
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_emitter.emit(InteractionManager.Events.interactionStart); |
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} |
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// process the queue regardless of a transition |
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if (nextInteractionCount === 0) { |
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while (_taskQueue.hasTasksToProcess()) { |
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_taskQueue.processNext(); |
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if (_deadline > 0 && |
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BatchedBridge.getEventLoopRunningTime() >= _deadline) { |
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// Hit deadline before processing all tasks, so process more later. |
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_scheduleUpdate(); |
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break; |
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} |
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} |
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} |
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_addInteractionSet.clear(); |
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_deleteInteractionSet.clear(); |
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} |
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module.exports = InteractionManager;
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