| // Copyright 2011 The Closure Library Authors. All Rights Reserved. |
| // |
| // 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. |
| |
| /** |
| * @fileoverview A wrapper for the HTML5 FileSaver object. |
| * |
| */ |
| |
| goog.provide('goog.fs.FileSaver'); |
| goog.provide('goog.fs.FileSaver.EventType'); |
| goog.provide('goog.fs.FileSaver.ReadyState'); |
| |
| goog.require('goog.events.EventTarget'); |
| goog.require('goog.fs.Error'); |
| goog.require('goog.fs.ProgressEvent'); |
| |
| |
| |
| /** |
| * An object for monitoring the saving of files. This emits ProgressEvents of |
| * the types listed in {@link goog.fs.FileSaver.EventType}. |
| * |
| * This should not be instantiated directly. Instead, its subclass |
| * {@link goog.fs.FileWriter} should be accessed via |
| * {@link goog.fs.FileEntry#createWriter}. |
| * |
| * @param {!FileSaver} fileSaver The underlying FileSaver object. |
| * @constructor |
| * @extends {goog.events.EventTarget} |
| */ |
| goog.fs.FileSaver = function(fileSaver) { |
| goog.fs.FileSaver.base(this, 'constructor'); |
| |
| /** |
| * The underlying FileSaver object. |
| * |
| * @type {!FileSaver} |
| * @private |
| */ |
| this.saver_ = fileSaver; |
| |
| this.saver_.onwritestart = goog.bind(this.dispatchProgressEvent_, this); |
| this.saver_.onprogress = goog.bind(this.dispatchProgressEvent_, this); |
| this.saver_.onwrite = goog.bind(this.dispatchProgressEvent_, this); |
| this.saver_.onabort = goog.bind(this.dispatchProgressEvent_, this); |
| this.saver_.onerror = goog.bind(this.dispatchProgressEvent_, this); |
| this.saver_.onwriteend = goog.bind(this.dispatchProgressEvent_, this); |
| }; |
| goog.inherits(goog.fs.FileSaver, goog.events.EventTarget); |
| |
| |
| /** |
| * Possible states for a FileSaver. |
| * |
| * @enum {number} |
| */ |
| goog.fs.FileSaver.ReadyState = { |
| /** |
| * The object has been constructed, but there is no pending write. |
| */ |
| INIT: 0, |
| /** |
| * Data is being written. |
| */ |
| WRITING: 1, |
| /** |
| * The data has been written to the file, the write was aborted, or an error |
| * occurred. |
| */ |
| DONE: 2 |
| }; |
| |
| |
| /** |
| * Events emitted by a FileSaver. |
| * |
| * @enum {string} |
| */ |
| goog.fs.FileSaver.EventType = { |
| /** |
| * Emitted when the writing begins. readyState will be WRITING. |
| */ |
| WRITE_START: 'writestart', |
| /** |
| * Emitted when progress has been made in saving the file. readyState will be |
| * WRITING. |
| */ |
| PROGRESS: 'progress', |
| /** |
| * Emitted when the data has been successfully written. readyState will be |
| * WRITING. |
| */ |
| WRITE: 'write', |
| /** |
| * Emitted when the writing has been aborted. readyState will be WRITING. |
| */ |
| ABORT: 'abort', |
| /** |
| * Emitted when an error is encountered or the writing has been aborted. |
| * readyState will be WRITING. |
| */ |
| ERROR: 'error', |
| /** |
| * Emitted when the writing is finished, whether successfully or not. |
| * readyState will be DONE. |
| */ |
| WRITE_END: 'writeend' |
| }; |
| |
| |
| /** |
| * Abort the writing of the file. |
| */ |
| goog.fs.FileSaver.prototype.abort = function() { |
| try { |
| this.saver_.abort(); |
| } catch (e) { |
| throw new goog.fs.Error(e, 'aborting save'); |
| } |
| }; |
| |
| |
| /** |
| * @return {goog.fs.FileSaver.ReadyState} The current state of the FileSaver. |
| */ |
| goog.fs.FileSaver.prototype.getReadyState = function() { |
| return /** @type {goog.fs.FileSaver.ReadyState} */ (this.saver_.readyState); |
| }; |
| |
| |
| /** |
| * @return {goog.fs.Error} The error encountered while writing, if any. |
| */ |
| goog.fs.FileSaver.prototype.getError = function() { |
| return this.saver_.error && |
| new goog.fs.Error(this.saver_.error, 'saving file'); |
| }; |
| |
| |
| /** |
| * Wrap a progress event emitted by the underlying file saver and re-emit it. |
| * |
| * @param {!ProgressEvent} event The underlying event. |
| * @private |
| */ |
| goog.fs.FileSaver.prototype.dispatchProgressEvent_ = function(event) { |
| this.dispatchEvent(new goog.fs.ProgressEvent(event, this)); |
| }; |
| |
| |
| /** @override */ |
| goog.fs.FileSaver.prototype.disposeInternal = function() { |
| delete this.saver_; |
| goog.fs.FileSaver.base(this, 'disposeInternal'); |
| }; |