ui/file_manager/gallery/js/gallery_util.js

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 var GalleryUtil = {};
   6
   7 /**
   8  * Obtains the entry set from the entries passed from onLaunched events.
   9  * If an single entry is specified, the function returns all entries in the same
  10  * directory. Otherwise the function returns the passed entries.
  11  *
  12  * The function also filters non-image items and hidden items.
  13  *
  14  * @param {!Array.<!FileEntry>} originalEntries Entries passed from onLaunched
  15  *     events.
  16  * @return {!Promise} Promise to be fulfilled with entry array.
  17  */
  18 GalleryUtil.createEntrySet = function(originalEntries) {
  19   var entriesPromise;
  20   if (originalEntries.length === 1) {
  21     var parentPromise =
  22         new Promise(originalEntries[0].getParent.bind(originalEntries[0]));
  23     entriesPromise = parentPromise.then(function(parent) {
  24       var reader = parent.createReader();
  25       var readEntries = function() {
  26         return new Promise(reader.readEntries.bind(reader)).then(
  27             function(entries) {
  28               if (entries.length === 0)
  29                 return [];
  30               return readEntries().then(function(nextEntries) {
  31                 return entries.concat(nextEntries);
  32               });
  33             });
  34       };
  35       return readEntries();
  36     }).then(function(entries) {
  37       return entries.filter(function(entry) {
  38         return originalEntries[0].toURL() === entry.toURL() ||
  39             entry.name[0] !== '.';
  40       });
  41     });
  42   } else {
  43     entriesPromise = Promise.resolve(originalEntries);
  44   }
  45
  46   return entriesPromise.then(function(entries) {
  47     return entries.filter(FileType.isImage).sort(function(a, b) {
  48       return a.name.localeCompare(b.name);
  49     });
  50   });
  51 };