Gallery: Split GalleryDataModel from gallery.js.

ui/file_manager/gallery/js/gallery.js

Index: ui/file_manager/gallery/js/gallery.js
diff --git a/ui/file_manager/gallery/js/gallery.js b/ui/file_manager/gallery/js/gallery.js
index b0a12ceb538121c208091ee9739700aaaaf1e488..899b7fffc553302fe1b5994297a379cc0d4280a1 100644
--- a/ui/file_manager/gallery/js/gallery.js
+++ b/ui/file_manager/gallery/js/gallery.js
@@ -9,150 +9,6 @@
 ContentProvider.WORKER_SCRIPT = '/js/metadata_worker.js';
 
 /**
- * Data model for gallery.
- *
- * @param {!MetadataCache} metadataCache Metadata cache.
- * @constructor
- * @extends {cr.ui.ArrayDataModel}
- */
-function GalleryDataModel(metadataCache) {
-  cr.ui.ArrayDataModel.call(this, []);
-
-  /**
-   * Metadata cache.
-   * @type {!MetadataCache}
-   * @private
-   */
-  this.metadataCache_ = metadataCache;
-
-  /**
-   * Directory where the image is saved if the image is located in a read-only
-   * volume.
-   * @type {DirectoryEntry}
-   */
-  this.fallbackSaveDirectory = null;
-
-  // Start to watch file system entries.
-  var watcher = new EntryListWatcher(this);
-  watcher.getEntry = function(item) { return item.getEntry(); };
-}
-
-/**
- * Maximum number of full size image cache.
- * @type {number}
- * @const
- * @private
- */
-GalleryDataModel.MAX_FULL_IMAGE_CACHE_ = 3;
-
-/**
- * Maximum number of screen size image cache.
- * @type {number}
- * @const
- * @private
- */
-GalleryDataModel.MAX_SCREEN_IMAGE_CACHE_ = 5;
-
-GalleryDataModel.prototype = {
-  __proto__: cr.ui.ArrayDataModel.prototype
-};
-
-/**
- * Saves new image.
- *
- * @param {!VolumeManager} volumeManager Volume manager instance.
- * @param {!Gallery.Item} item Original gallery item.
- * @param {!HTMLCanvasElement} canvas Canvas containing new image.
- * @param {boolean} overwrite Whether to overwrite the image to the item or not.
- * @return {!Promise} Promise to be fulfilled with when the operation completes.
- */
-GalleryDataModel.prototype.saveItem = function(
-    volumeManager, item, canvas, overwrite) {
-  var oldEntry = item.getEntry();
-  var oldMetadata = item.getMetadata();
-  var oldLocationInfo = item.getLocationInfo();
-  return new Promise(function(fulfill, reject) {
-    item.saveToFile(
-        volumeManager,
-        this.fallbackSaveDirectory,
-        overwrite,
-        canvas,
-        function(success) {
-          if (!success) {
-            reject('Failed to save the image.');
-            return;
-          }
-
-          // Current entry is updated.
-          // Dispatch an event.
-          var event = new Event('content');
-          event.item = item;
-          event.oldEntry = oldEntry;
-          event.metadata = item.getMetadata();
-          this.dispatchEvent(event);
-
-          if (!util.isSameEntry(oldEntry, item.getEntry())) {
-            // New entry is added and the item now tracks it.
-            // Add another item for the old entry.
-            var anotherItem = new Gallery.Item(
-                oldEntry,
-                oldLocationInfo,
-                oldMetadata,
-                this.metadataCache_,
-                item.isOriginal());
-            // The item must be added behind the existing item so that it does
-            // not change the index of the existing item.
-            // TODO(hirono): Update the item index of the selection model
-            // correctly.
-            this.splice(this.indexOf(item) + 1, 0, anotherItem);
-          }
-
-          fulfill();
-        }.bind(this));
-  }.bind(this));
-};
-
-/**
- * Evicts image caches in the items.
- */
-GalleryDataModel.prototype.evictCache = function() {
-  // Sort the item by the last accessed date.
-  var sorted = this.slice().sort(function(a, b) {
-    return b.getLastAccessedDate() - a.getLastAccessedDate();
-  });
-
-  // Evict caches.
-  var contentCacheCount = 0;
-  var screenCacheCount = 0;
-  for (var i = 0; i < sorted.length; i++) {
-    if (sorted[i].contentImage) {
-      if (++contentCacheCount > GalleryDataModel.MAX_FULL_IMAGE_CACHE_) {
-        if (sorted[i].contentImage.parentNode) {
-          console.error('The content image has a parent node.');
-        } else {
-          // Force to free the buffer of the canvas by assigning zero size.
-          sorted[i].contentImage.width = 0;
-          sorted[i].contentImage.height = 0;
-          sorted[i].contentImage = null;
-        }
-      }
-    }
-    if (sorted[i].screenImage) {
-      if (++screenCacheCount > GalleryDataModel.MAX_SCREEN_IMAGE_CACHE_) {
-        if (sorted[i].screenImage.parentNode) {
-          console.error('The screen image has a parent node.');
-        } else {
-          // Force to free the buffer of the canvas by assigning zero size.
-          sorted[i].screenImage.width = 0;
-          sorted[i].screenImage.height = 0;
-          sorted[i].screenImage = null;
-        }
-      }
-    }
-  }
-};
-
-/**
  * Gallery for viewing and editing image files.
  *
  * @param {!VolumeManager} volumeManager The VolumeManager instance of the