Add script files of the separated Gallery.app.

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 e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..a8c15ceea5f91c74ae496ee7edde615827035f49 100644
--- a/ui/file_manager/gallery/js/gallery.js
+++ b/ui/file_manager/gallery/js/gallery.js
@@ -0,0 +1,895 @@
+// Copyright (c) 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+'use strict';
+
+/**
+ * Called from the main frame when unloading.
+ * @param {boolean=} opt_exiting True if the app is exiting.
+ */
+function unload(opt_exiting) { Gallery.instance.onUnload(opt_exiting); }
+
+/**
+ * Overrided metadata worker's path.
+ * @type {string}
+ * @const
+ */
+ContentProvider.WORKER_SCRIPT = '/js/metadata_worker.js';
+
+/**
+ * Gallery for viewing and editing image files.
+ *
+ * @param {!VolumeManager} volumeManager The VolumeManager instance of the
+ *     system.
+ * @class
+ * @constructor
+ */
+function Gallery(volumeManager) {
+  this.context_ = {
+    appWindow: chrome.app.window.current(),
+    onBack: function() {},
+    onClose: function() {},
+    onMaximize: function() {},
+    onMinimize: function() {},
+    onAppRegionChanged: function() {},
+    metadataCache: MetadataCache.createFull(volumeManager),
+    shareActions: [],
+    readonlyDirName: '',
+    saveDirEntry: null,
+    displayStringFunction: function() { return ''; },
+    loadTimeData: {}
+  };
+  this.container_ = document.querySelector('.gallery');
+  this.document_ = document;
+  this.metadataCache_ = this.context_.metadataCache;
+  this.volumeManager_ = volumeManager;
+  this.selectedEntry_ = null;
+  this.metadataCacheObserverId_ = null;
+  this.onExternallyUnmountedBound_ = this.onExternallyUnmounted_.bind(this);
+
+  this.dataModel_ = new cr.ui.ArrayDataModel([]);
+  this.selectionModel_ = new cr.ui.ListSelectionModel();
+
+  this.initDom_();
+  this.initListeners_();
+}
+
+/**
+ * Gallery extends cr.EventTarget.
+ */
+Gallery.prototype.__proto__ = cr.EventTarget.prototype;
+
+/**
+ * Tools fade-out timeout im milliseconds.
+ * @const
+ * @type {number}
+ */
+Gallery.FADE_TIMEOUT = 3000;
+
+/**
+ * First time tools fade-out timeout im milliseconds.
+ * @const
+ * @type {number}
+ */
+Gallery.FIRST_FADE_TIMEOUT = 1000;
+
+/**
+ * Time until mosaic is initialized in the background. Used to make gallery
+ * in the slide mode load faster. In miiliseconds.
+ * @const
+ * @type {number}
+ */
+Gallery.MOSAIC_BACKGROUND_INIT_DELAY = 1000;
+
+/**
+ * Types of metadata Gallery uses (to query the metadata cache).
+ * @const
+ * @type {string}
+ */
+Gallery.METADATA_TYPE = 'thumbnail|filesystem|media|streaming|drive';
+
+/**
+ * Initializes listeners.
+ * @private
+ */
+Gallery.prototype.initListeners_ = function() {
+  this.keyDownBound_ = this.onKeyDown_.bind(this);
+  this.document_.body.addEventListener('keydown', this.keyDownBound_);
+
+  this.inactivityWatcher_ = new MouseInactivityWatcher(
+      this.container_, Gallery.FADE_TIMEOUT, this.hasActiveTool.bind(this));
+
+  // Search results may contain files from different subdirectories so
+  // the observer is not going to work.
+  if (!this.context_.searchResults && this.context_.curDirEntry) {
+    this.metadataCacheObserverId_ = this.metadataCache_.addObserver(
+        this.context_.curDirEntry,
+        MetadataCache.CHILDREN,
+        'thumbnail',
+        this.updateThumbnails_.bind(this));
+  }
+  this.volumeManager_.addEventListener(
+      'externally-unmounted', this.onExternallyUnmountedBound_);
+};
+
+/**
+ * Closes gallery when a volume containing the selected item is unmounted.
+ * @param {!Event} event The unmount event.
+ * @private
+ */
+Gallery.prototype.onExternallyUnmounted_ = function(event) {
+  if (!this.selectedEntry_)
+    return;
+
+  if (this.volumeManager_.getVolumeInfo(this.selectedEntry_) ===
+      event.volumeInfo) {
+    this.onBack_();
+  }
+};
+
+/**
+ * Unloads the Gallery.
+ * @param {boolean} exiting True if the app is exiting.
+ */
+Gallery.prototype.onUnload = function(exiting) {
+  if (this.metadataCacheObserverId_ !== null)
+    this.metadataCache_.removeObserver(this.metadataCacheObserverId_);
+  this.volumeManager_.removeEventListener(
+      'externally-unmounted', this.onExternallyUnmountedBound_);
+  this.slideMode_.onUnload(exiting);
+};
+
+/**
+ * Initializes DOM UI
+ * @private
+ */
+Gallery.prototype.initDom_ = function() {
+  // Initialize the dialog label.
+  cr.ui.dialogs.BaseDialog.OK_LABEL = str('GALLERY_OK_LABEL');
+  cr.ui.dialogs.BaseDialog.CANCEL_LABEL = str('GALLERY_CANCEL_LABEL');
+
+  var content = util.createChild(this.container_, 'content');
+  content.addEventListener('click', this.onContentClick_.bind(this));
+
+  this.header_ = util.createChild(this.container_, 'header tool dimmable');
+  this.toolbar_ = util.createChild(this.container_, 'toolbar tool dimmable');
+
+  var backButton = util.createChild(this.container_,
+                                    'back-button tool dimmable');
+  util.createChild(backButton);
+  backButton.addEventListener('click', this.onBack_.bind(this));
+
+  var preventDefault = function(event) { event.preventDefault(); };
+
+  var minimizeButton = util.createChild(this.header_,
+                                        'minimize-button tool dimmable',
+                                        'button');
+  minimizeButton.tabIndex = -1;
+  minimizeButton.addEventListener('click', this.onMinimize_.bind(this));
+  minimizeButton.addEventListener('mousedown', preventDefault);
+
+  var maximizeButton = util.createChild(this.header_,
+                                        'maximize-button tool dimmable',
+                                        'button');
+  maximizeButton.tabIndex = -1;
+  maximizeButton.addEventListener('click', this.onMaximize_.bind(this));
+  maximizeButton.addEventListener('mousedown', preventDefault);
+
+  var closeButton = util.createChild(this.header_,
+                                     'close-button tool dimmable',
+                                     'button');
+  closeButton.tabIndex = -1;
+  closeButton.addEventListener('click', this.onClose_.bind(this));
+  closeButton.addEventListener('mousedown', preventDefault);
+
+  this.filenameSpacer_ = util.createChild(this.toolbar_, 'filename-spacer');
+  this.filenameEdit_ = util.createChild(this.filenameSpacer_,
+                                        'namebox', 'input');
+
+  this.filenameEdit_.setAttribute('type', 'text');
+  this.filenameEdit_.addEventListener('blur',
+      this.onFilenameEditBlur_.bind(this));
+
+  this.filenameEdit_.addEventListener('focus',
+      this.onFilenameFocus_.bind(this));
+
+  this.filenameEdit_.addEventListener('keydown',
+      this.onFilenameEditKeydown_.bind(this));
+
+  util.createChild(this.toolbar_, 'button-spacer');
+
+  this.prompt_ = new ImageEditor.Prompt(this.container_, str);
+
+  this.modeButton_ = util.createChild(this.toolbar_, 'button mode', 'button');
+  this.modeButton_.addEventListener('click',
+      this.toggleMode_.bind(this, null));
+
+  this.mosaicMode_ = new MosaicMode(content,
+                                    this.dataModel_,
+                                    this.selectionModel_,
+                                    this.metadataCache_,
+                                    this.volumeManager_,
+                                    this.toggleMode_.bind(this, null));
+
+  this.slideMode_ = new SlideMode(this.container_,
+                                  content,
+                                  this.toolbar_,
+                                  this.prompt_,
+                                  this.dataModel_,
+                                  this.selectionModel_,
+                                  this.context_,
+                                  this.toggleMode_.bind(this),
+                                  str);
+
+  this.slideMode_.addEventListener('image-displayed', function() {
+    cr.dispatchSimpleEvent(this, 'image-displayed');
+  }.bind(this));
+  this.slideMode_.addEventListener('image-saved', function() {
+    cr.dispatchSimpleEvent(this, 'image-saved');
+  }.bind(this));
+
+  var deleteButton = this.createToolbarButton_('delete', 'GALLERY_DELETE');
+  deleteButton.addEventListener('click', this.delete_.bind(this));
+
+  this.shareButton_ = this.createToolbarButton_('share', 'GALLERY_SHARE');
+  this.shareButton_.setAttribute('disabled', '');
+  this.shareButton_.addEventListener('click', this.toggleShare_.bind(this));
+
+  this.shareMenu_ = util.createChild(this.container_, 'share-menu');
+  this.shareMenu_.hidden = true;
+  util.createChild(this.shareMenu_, 'bubble-point');
+
+  this.dataModel_.addEventListener('splice', this.onSplice_.bind(this));
+  this.dataModel_.addEventListener('content', this.onContentChange_.bind(this));
+
+  this.selectionModel_.addEventListener('change', this.onSelection_.bind(this));
+  this.slideMode_.addEventListener('useraction', this.onUserAction_.bind(this));
+};
+
+/**
+ * Creates toolbar button.
+ *
+ * @param {string} className Class to add.
+ * @param {string} title Button title.
+ * @return {!HTMLElement} Newly created button.
+ * @private
+ */
+Gallery.prototype.createToolbarButton_ = function(className, title) {
+  var button = util.createChild(this.toolbar_, className, 'button');
+  button.title = str(title);
+  return button;
+};
+
+/**
+ * Loads the content.
+ *
+ * @param {!Array.<Entry>} entries Array of entries.
+ * @param {!Array.<Entry>} selectedEntries Array of selected entries.
+ */
+Gallery.prototype.load = function(entries, selectedEntries) {
+  var items = [];
+  for (var index = 0; index < entries.length; ++index) {
+    items.push(new Gallery.Item(entries[index]));
+  }
+  this.dataModel_.push.apply(this.dataModel_, items);
+
+  this.selectionModel_.adjustLength(this.dataModel_.length);
+
+  // Comparing Entries by reference is not safe. Therefore we have to use URLs.
+  var entryIndexesByURLs = {};
+  for (var index = 0; index < entries.length; index++) {
+    entryIndexesByURLs[entries[index].toURL()] = index;
+  }
+
+  for (var i = 0; i !== selectedEntries.length; i++) {
+    var selectedIndex = entryIndexesByURLs[selectedEntries[i].toURL()];
+    if (selectedIndex !== undefined)
+      this.selectionModel_.setIndexSelected(selectedIndex, true);
+    else
+      console.error('Cannot select ' + selectedEntries[i]);
+  }
+
+  if (this.selectionModel_.selectedIndexes.length === 0)
+    this.onSelection_();
+
+  var mosaic = this.mosaicMode_ && this.mosaicMode_.getMosaic();
+
+  // Mosaic view should show up if most of the selected files are images.
+  var imagesCount = 0;
+  for (var i = 0; i !== selectedEntries.length; i++) {
+    if (FileType.getMediaType(selectedEntries[i]) === 'image')
+      imagesCount++;
+  }
+  var mostlyImages = imagesCount > (selectedEntries.length / 2.0);
+
+  var forcedMosaic = (this.context_.pageState &&
+      this.context_.pageState.gallery === 'mosaic');
+
+  var showMosaic = (mostlyImages && selectedEntries.length > 1) || forcedMosaic;
+  if (mosaic && showMosaic) {
+    this.setCurrentMode_(this.mosaicMode_);
+    mosaic.init();
+    mosaic.show();
+    this.inactivityWatcher_.check();  // Show the toolbar.
+    cr.dispatchSimpleEvent(this, 'loaded');
+  } else {
+    this.setCurrentMode_(this.slideMode_);
+    var maybeLoadMosaic = function() {
+      if (mosaic)
+        mosaic.init();
+      cr.dispatchSimpleEvent(this, 'loaded');
+    }.bind(this);
+    /* TODO: consider nice blow-up animation for the first image */
+    this.slideMode_.enter(null, function() {
+        // Flash the toolbar briefly to show it is there.
+        this.inactivityWatcher_.kick(Gallery.FIRST_FADE_TIMEOUT);
+      }.bind(this),
+      maybeLoadMosaic);
+  }
+};
+
+/**
+ * Closes the Gallery and go to Files.app.
+ * @private
+ */
+Gallery.prototype.back_ = function() {
+  if (util.isFullScreen(this.context_.appWindow)) {
+    util.toggleFullScreen(this.context_.appWindow,
+                          false);  // Leave the full screen mode.
+  }
+  this.context_.onBack(this.getSelectedEntries());
+};
+
+/**
+ * Handles user's 'Back' action (Escape or a click on the X icon).
+ * @private
+ */
+Gallery.prototype.onBack_ = function() {
+  this.executeWhenReady(this.back_.bind(this));
+};
+
+/**
+ * Handles user's 'Close' action.
+ * @private
+ */
+Gallery.prototype.onClose_ = function() {
+  this.executeWhenReady(this.context_.onClose);
+};
+
+/**
+ * Handles user's 'Maximize' action (Escape or a click on the X icon).
+ * @private
+ */
+Gallery.prototype.onMaximize_ = function() {
+  this.executeWhenReady(this.context_.onMaximize);
+};
+
+/**
+ * Handles user's 'Maximize' action (Escape or a click on the X icon).
+ * @private
+ */
+Gallery.prototype.onMinimize_ = function() {
+  this.executeWhenReady(this.context_.onMinimize);
+};
+
+/**
+ * Executes a function when the editor is done with the modifications.
+ * @param {function} callback Function to execute.
+ */
+Gallery.prototype.executeWhenReady = function(callback) {
+  this.currentMode_.executeWhenReady(callback);
+};
+
+/**
+ * @return {Object} File browser private API.
+ */
+Gallery.getFileBrowserPrivate = function() {
+  return chrome.fileBrowserPrivate || window.top.chrome.fileBrowserPrivate;
+};
+
+/**
+ * @return {boolean} True if some tool is currently active.
+ */
+Gallery.prototype.hasActiveTool = function() {
+  return this.currentMode_.hasActiveTool() ||
+      this.isSharing_() || this.isRenaming_();
+};
+
+/**
+* External user action event handler.
+* @private
+*/
+Gallery.prototype.onUserAction_ = function() {
+  this.closeShareMenu_();
+  // Show the toolbar and hide it after the default timeout.
+  this.inactivityWatcher_.kick();
+};
+
+/**
+ * Sets the current mode, update the UI.
+ * @param {Object} mode Current mode.
+ * @private
+ */
+Gallery.prototype.setCurrentMode_ = function(mode) {
+  if (mode !== this.slideMode_ && mode !== this.mosaicMode_)
+    console.error('Invalid Gallery mode');
+
+  this.currentMode_ = mode;
+  this.container_.setAttribute('mode', this.currentMode_.getName());
+  this.updateSelectionAndState_();
+  this.updateButtons_();
+};
+
+/**
+ * Mode toggle event handler.
+ * @param {function=} opt_callback Callback.
+ * @param {Event=} opt_event Event that caused this call.
+ * @private
+ */
+Gallery.prototype.toggleMode_ = function(opt_callback, opt_event) {
+  if (!this.modeButton_)
+    return;
+
+  if (this.changingMode_) // Do not re-enter while changing the mode.
+    return;
+
+  if (opt_event)
+    this.onUserAction_();
+
+  this.changingMode_ = true;
+
+  var onModeChanged = function() {
+    this.changingMode_ = false;
+    if (opt_callback) opt_callback();
+  }.bind(this);
+
+  var tileIndex = Math.max(0, this.selectionModel_.selectedIndex);
+
+  var mosaic = this.mosaicMode_.getMosaic();
+  var tileRect = mosaic.getTileRect(tileIndex);
+
+  if (this.currentMode_ === this.slideMode_) {
+    this.setCurrentMode_(this.mosaicMode_);
+    mosaic.transform(
+        tileRect, this.slideMode_.getSelectedImageRect(), true /* instant */);
+    this.slideMode_.leave(
+        tileRect,
+        function() {
+          // Animate back to normal position.
+          mosaic.transform();
+          mosaic.show();
+          onModeChanged();
+        }.bind(this));
+  } else {
+    this.setCurrentMode_(this.slideMode_);
+    this.slideMode_.enter(
+        tileRect,
+        function() {
+          // Animate to zoomed position.
+          mosaic.transform(tileRect, this.slideMode_.getSelectedImageRect());
+          mosaic.hide();
+        }.bind(this),
+        onModeChanged);
+  }
+};
+
+/**
+ * Deletes the selected items.
+ * @private
+ */
+Gallery.prototype.delete_ = function() {
+  this.onUserAction_();
+
+  // Clone the sorted selected indexes array.
+  var indexesToRemove = this.selectionModel_.selectedIndexes.slice();
+  if (!indexesToRemove.length)
+    return;
+
+  /* TODO(dgozman): Implement Undo delete, Remove the confirmation dialog. */
+
+  var itemsToRemove = this.getSelectedItems();
+  var plural = itemsToRemove.length > 1;
+  var param = plural ? itemsToRemove.length : itemsToRemove[0].getFileName();
+
+  function deleteNext() {
+    if (!itemsToRemove.length)
+      return;  // All deleted.
+
+    // TODO(hirono): Use fileOperationManager.
+    var entry = itemsToRemove.pop().getEntry();
+    entry.remove(deleteNext, function() {
+      util.flog('Error deleting: ' + entry.name, deleteNext);
+    });
+  }
+
+  // Prevent the Gallery from handling Esc and Enter.
+  this.document_.body.removeEventListener('keydown', this.keyDownBound_);
+  var restoreListener = function() {
+    this.document_.body.addEventListener('keydown', this.keyDownBound_);
+  }.bind(this);
+
+
+  var confirm = new cr.ui.dialogs.ConfirmDialog(this.container_);
+  confirm.show(strf(plural ?
+      'GALLERY_CONFIRM_DELETE_SOME' : 'GALLERY_CONFIRM_DELETE_ONE', param),
+      function() {
+        restoreListener();
+        this.selectionModel_.unselectAll();
+        this.selectionModel_.leadIndex = -1;
+        // Remove items from the data model, starting from the highest index.
+        while (indexesToRemove.length)
+          this.dataModel_.splice(indexesToRemove.pop(), 1);
+        // Delete actual files.
+        deleteNext();
+      }.bind(this),
+      function() {
+        // Restore the listener after a timeout so that ESC is processed.
+        setTimeout(restoreListener, 0);
+      });
+};
+
+/**
+ * @return {Array.<Gallery.Item>} Current selection.
+ */
+Gallery.prototype.getSelectedItems = function() {
+  return this.selectionModel_.selectedIndexes.map(
+      this.dataModel_.item.bind(this.dataModel_));
+};
+
+/**
+ * @return {Array.<Entry>} Array of currently selected entries.
+ */
+Gallery.prototype.getSelectedEntries = function() {
+  return this.selectionModel_.selectedIndexes.map(function(index) {
+    return this.dataModel_.item(index).getEntry();
+  }.bind(this));
+};
+
+/**
+ * @return {?Gallery.Item} Current single selection.
+ */
+Gallery.prototype.getSingleSelectedItem = function() {
+  var items = this.getSelectedItems();
+  if (items.length > 1) {
+    console.error('Unexpected multiple selection');
+    return null;
+  }
+  return items[0];
+};
+
+/**
+  * Selection change event handler.
+  * @private
+  */
+Gallery.prototype.onSelection_ = function() {
+  this.updateSelectionAndState_();
+  this.updateShareMenu_();
+};
+
+/**
+  * Data model splice event handler.
+  * @private
+  */
+Gallery.prototype.onSplice_ = function() {
+  this.selectionModel_.adjustLength(this.dataModel_.length);
+};
+
+/**
+ * Content change event handler.
+ * @param {Event} event Event.
+ * @private
+*/
+Gallery.prototype.onContentChange_ = function(event) {
+  var index = this.dataModel_.indexOf(event.item);
+  if (index !== this.selectionModel_.selectedIndex)
+    console.error('Content changed for unselected item');
+  this.updateSelectionAndState_();
+};
+
+/**
+ * Keydown handler.
+ *
+ * @param {Event} event Event.
+ * @private
+ */
+Gallery.prototype.onKeyDown_ = function(event) {
+  var wasSharing = this.isSharing_();
+  this.closeShareMenu_();
+
+  if (this.currentMode_.onKeyDown(event))
+    return;
+
+  switch (util.getKeyModifiers(event) + event.keyIdentifier) {
+    case 'U+0008': // Backspace.
+      // The default handler would call history.back and close the Gallery.
+      event.preventDefault();
+      break;
+
+    case 'U+001B':  // Escape
+      // Swallow Esc if it closed the Share menu, otherwise close the Gallery.
+      if (!wasSharing)
+        this.onBack_();
+      break;
+
+    case 'U+004D':  // 'm' switches between Slide and Mosaic mode.
+      this.toggleMode_(null, event);
+      break;
+
+    case 'U+0056':  // 'v'
+      this.slideMode_.startSlideshow(SlideMode.SLIDESHOW_INTERVAL_FIRST, event);
+      break;
+
+    case 'U+007F':  // Delete
+    case 'Shift-U+0033':  // Shift+'3' (Delete key might be missing).
+      this.delete_();
+      break;
+  }
+};
+
+// Name box and rename support.
+
+/**
+ * Updates the UI related to the selected item and the persistent state.
+ *
+ * @private
+ */
+Gallery.prototype.updateSelectionAndState_ = function() {
+  var numSelectedItems = this.selectionModel_.selectedIndexes.length;
+  var displayName = '';
+  var selectedEntryURL = null;
+
+  // If it's selecting something, update the variable values.
+  if (numSelectedItems) {
+    var selectedItem =
+        this.dataModel_.item(this.selectionModel_.selectedIndex);
+    this.selectedEntry_ = selectedItem.getEntry();
+    selectedEntryURL = this.selectedEntry_.toURL();
+
+    if (numSelectedItems === 1) {
+      window.top.document.title = this.selectedEntry_.name;
+      displayName = ImageUtil.getDisplayNameFromName(this.selectedEntry_.name);
+    } else if (this.context_.curDirEntry) {
+      // If the Gallery was opened on search results the search query will not
+      // be recorded in the app state and the relaunch will just open the
+      // gallery in the curDirEntry directory.
+      window.top.document.title = this.context_.curDirEntry.name;
+      displayName = strf('GALLERY_ITEMS_SELECTED', numSelectedItems);
+    }
+  }
+
+  window.top.util.updateAppState(
+      null,  // Keep the current directory.
+      selectedEntryURL,  // Update the selection.
+      {gallery: (this.currentMode_ === this.mosaicMode_ ? 'mosaic' : 'slide')});
+
+  // We can't rename files in readonly directory.
+  // We can only rename a single file.
+  this.filenameEdit_.disabled = numSelectedItems !== 1 ||
+                                this.context_.readonlyDirName;
+  this.filenameEdit_.value = displayName;
+};
+
+/**
+ * Click event handler on filename edit box
+ * @private
+ */
+Gallery.prototype.onFilenameFocus_ = function() {
+  ImageUtil.setAttribute(this.filenameSpacer_, 'renaming', true);
+  this.filenameEdit_.originalValue = this.filenameEdit_.value;
+  setTimeout(this.filenameEdit_.select.bind(this.filenameEdit_), 0);
+  this.onUserAction_();
+};
+
+/**
+ * Blur event handler on filename edit box.
+ *
+ * @param {Event} event Blur event.
+ * @return {boolean} if default action should be prevented.
+ * @private
+ */
+Gallery.prototype.onFilenameEditBlur_ = function(event) {
+  if (this.filenameEdit_.value && this.filenameEdit_.value[0] === '.') {
+    this.prompt_.show('GALLERY_FILE_HIDDEN_NAME', 5000);
+    this.filenameEdit_.focus();
+    event.stopPropagation();
+    event.preventDefault();
+    return false;
+  }
+
+  var item = this.getSingleSelectedItem();
+  if (item) {
+    var oldEntry = item.getEntry();
+
+    var onFileExists = function() {
+      this.prompt_.show('GALLERY_FILE_EXISTS', 3000);
+      this.filenameEdit_.value = name;
+      this.filenameEdit_.focus();
+    }.bind(this);
+
+    var onSuccess = function() {
+      var event = new Event('content');
+      event.item = item;
+      event.oldEntry = oldEntry;
+      event.metadata = null;  // Metadata unchanged.
+      this.dataModel_.dispatchEvent(event);
+    }.bind(this);
+
+    if (this.filenameEdit_.value) {
+      item.rename(
+          this.filenameEdit_.value, onSuccess, onFileExists);
+    }
+  }
+
+  ImageUtil.setAttribute(this.filenameSpacer_, 'renaming', false);
+  this.onUserAction_();
+};
+
+/**
+ * Keydown event handler on filename edit box
+ * @private
+ */
+Gallery.prototype.onFilenameEditKeydown_ = function() {
+  switch (event.keyCode) {
+    case 27:  // Escape
+      this.filenameEdit_.value = this.filenameEdit_.originalValue;
+      this.filenameEdit_.blur();
+      break;
+
+    case 13:  // Enter
+      this.filenameEdit_.blur();
+      break;
+  }
+  event.stopPropagation();
+};
+
+/**
+ * @return {boolean} True if file renaming is currently in progress.
+ * @private
+ */
+Gallery.prototype.isRenaming_ = function() {
+  return this.filenameSpacer_.hasAttribute('renaming');
+};
+
+/**
+ * Content area click handler.
+ * @private
+ */
+Gallery.prototype.onContentClick_ = function() {
+  this.closeShareMenu_();
+  this.filenameEdit_.blur();
+};
+
+// Share button support.
+
+/**
+ * @return {boolean} True if the Share menu is active.
+ * @private
+ */
+Gallery.prototype.isSharing_ = function() {
+  return !this.shareMenu_.hidden;
+};
+
+/**
+ * Close Share menu if it is open.
+ * @private
+ */
+Gallery.prototype.closeShareMenu_ = function() {
+  if (this.isSharing_())
+    this.toggleShare_();
+};
+
+/**
+ * Share button handler.
+ * @private
+ */
+Gallery.prototype.toggleShare_ = function() {
+  if (!this.shareButton_.hasAttribute('disabled'))
+    this.shareMenu_.hidden = !this.shareMenu_.hidden;
+  this.inactivityWatcher_.check();
+};
+
+/**
+ * Updates available actions list based on the currently selected urls.
+ * @private.
+ */
+Gallery.prototype.updateShareMenu_ = function() {
+  var entries = this.getSelectedEntries();
+
+  function isShareAction(task) {
+    var taskParts = task.taskId.split('|');
+    return taskParts[0] !== chrome.runtime.id;
+  }
+
+  var api = Gallery.getFileBrowserPrivate();
+  var mimeTypes = [];  // TODO(kaznacheev) Collect mime types properly.
+
+  var createShareMenu = function(tasks) {
+    var wasHidden = this.shareMenu_.hidden;
+    this.shareMenu_.hidden = true;
+    var items = this.shareMenu_.querySelectorAll('.item');
+    for (var i = 0; i !== items.length; i++) {
+      items[i].parentNode.removeChild(items[i]);
+    }
+
+    for (var t = 0; t !== tasks.length; t++) {
+      var task = tasks[t];
+      if (!isShareAction(task)) continue;
+
+      var item = util.createChild(this.shareMenu_, 'item');
+      item.textContent = task.title;
+      item.style.backgroundImage = 'url(' + task.iconUrl + ')';
+      item.addEventListener('click', function(taskId) {
+        this.toggleShare_();  // Hide the menu.
+        // TODO(hirono): Use entries instead of URLs.
+        this.executeWhenReady(
+            api.executeTask.bind(
+                api,
+                taskId,
+                util.entriesToURLs(entries),
+                function(result) {
+                  var alertDialog =
+                      new cr.ui.dialogs.AlertDialog(this.container_);
+                  util.isTeleported(window).then(function(teleported) {
+                    if (teleported)
+                      util.showOpenInOtherDesktopAlert(alertDialog, entries);
+                  }.bind(this));
+                }.bind(this)));
+      }.bind(this, task.taskId));
+    }
+
+    var empty = this.shareMenu_.querySelector('.item') === null;
+    ImageUtil.setAttribute(this.shareButton_, 'disabled', empty);
+    this.shareMenu_.hidden = wasHidden || empty;
+  }.bind(this);
+
+  // Create or update the share menu with a list of sharing tasks and show
+  // or hide the share button.
+  // TODO(mtomasz): Pass Entries directly, instead of URLs.
+  if (!entries.length)
+    createShareMenu([]);  // Empty list of tasks, since there is no selection.
+  else
+    api.getFileTasks(util.entriesToURLs(entries), mimeTypes, createShareMenu);
+};
+
+/**
+ * Updates thumbnails.
+ * @private
+ */
+Gallery.prototype.updateThumbnails_ = function() {
+  if (this.currentMode_ === this.slideMode_)
+    this.slideMode_.updateThumbnails();
+
+  if (this.mosaicMode_) {
+    var mosaic = this.mosaicMode_.getMosaic();
+    if (mosaic.isInitialized())
+      mosaic.reload();
+  }
+};
+
+/**
+ * Updates buttons.
+ * @private
+ */
+Gallery.prototype.updateButtons_ = function() {
+  if (this.modeButton_) {
+    var oppositeMode =
+        this.currentMode_ === this.slideMode_ ? this.mosaicMode_ :
+                                                this.slideMode_;
+    this.modeButton_.title = str(oppositeMode.getTitle());
+  }
+};
+
+window.addEventListener('load', function() {
+  var entries = window.launchData.items.map(
+      function(item) { return item.entry; });
+  window.backgroundComponent.
+      then(function(inBackgroundComponent) {
+        window.loadTimeData.data = inBackgroundComponent.stringData;
+        var gallery = new Gallery(inBackgroundComponent.volumeManager);
+        gallery.load(entries, entries);
+      }).
+      catch(function(error) {
+        console.error(error.stack || error);
+      });
+});