[Files.app] Split the JavaScript files into subdirectories: common, background, and foreground

chrome/browser/resources/file_manager/js/photo/ribbon.js

-// Copyright (c) 2012 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';
-
-/**
- * Scrollable thumbnail ribbon at the bottom of the Gallery in the Slide mode.
- *
- * @param {Document} document Document.
- * @param {MetadataCache} metadataCache MetadataCache instance.
- * @param {cr.ui.ArrayDataModel} dataModel Data model.
- * @param {cr.ui.ListSelectionModel} selectionModel Selection model.
- * @return {Element} Ribbon element.
- * @constructor
- */
-function Ribbon(document, metadataCache, dataModel, selectionModel) {
-  var self = document.createElement('div');
-  Ribbon.decorate(self, metadataCache, dataModel, selectionModel);
-  return self;
-}
-
-/**
- * Inherit from HTMLDivElement.
- */
-Ribbon.prototype.__proto__ = HTMLDivElement.prototype;
-
-/**
- * Decorate a Ribbon instance.
- *
- * @param {Ribbon} self Self pointer.
- * @param {MetadataCache} metadataCache MetadataCache instance.
- * @param {cr.ui.ArrayDataModel} dataModel Data model.
- * @param {cr.ui.ListSelectionModel} selectionModel Selection model.
- */
-Ribbon.decorate = function(self, metadataCache, dataModel, selectionModel) {
-  self.__proto__ = Ribbon.prototype;
-  self.metadataCache_ = metadataCache;
-  self.dataModel_ = dataModel;
-  self.selectionModel_ = selectionModel;
-
-  self.className = 'ribbon';
-};
-
-/**
- * Max number of thumbnails in the ribbon.
- * @type {number}
- */
-Ribbon.ITEMS_COUNT = 5;
-
-/**
- * Force redraw the ribbon.
- */
-Ribbon.prototype.redraw = function() {
-  this.onSelection_();
-};
-
-/**
- * Clear all cached data to force full redraw on the next selection change.
- */
-Ribbon.prototype.reset = function() {
-  this.renderCache_ = {};
-  this.firstVisibleIndex_ = 0;
-  this.lastVisibleIndex_ = -1;  // Zero thumbnails
-};
-
-/**
- * Enable the ribbon.
- */
-Ribbon.prototype.enable = function() {
-  this.onContentBound_ = this.onContentChange_.bind(this);
-  this.dataModel_.addEventListener('content', this.onContentBound_);
-
-  this.onSpliceBound_ = this.onSplice_.bind(this);
-  this.dataModel_.addEventListener('splice', this.onSpliceBound_);
-
-  this.onSelectionBound_ = this.onSelection_.bind(this);
-  this.selectionModel_.addEventListener('change', this.onSelectionBound_);
-
-  this.reset();
-  this.redraw();
-};
-
-/**
- * Disable ribbon.
- */
-Ribbon.prototype.disable = function() {
-  this.dataModel_.removeEventListener('content', this.onContentBound_);
-  this.dataModel_.removeEventListener('splice', this.onSpliceBound_);
-  this.selectionModel_.removeEventListener('change', this.onSelectionBound_);
-
-  this.removeVanishing_();
-  this.textContent = '';
-};
-
-/**
- * Data model splice handler.
- * @param {Event} event Event.
- * @private
- */
-Ribbon.prototype.onSplice_ = function(event) {
-  if (event.removed.length == 0)
-    return;
-
-  if (event.removed.length > 1) {
-    console.error('Cannot remove multiple items');
-    return;
-  }
-
-  var removed = this.renderCache_[event.removed[0].getUrl()];
-  if (!removed || !removed.parentNode || !removed.hasAttribute('selected')) {
-    console.error('Can only remove the selected item');
-    return;
-  }
-
-  var persistentNodes = this.querySelectorAll('.ribbon-image:not([vanishing])');
-  if (this.lastVisibleIndex_ < this.dataModel_.length) { // Not at the end.
-    var lastNode = persistentNodes[persistentNodes.length - 1];
-    if (lastNode.nextSibling) {
-      // Pull back a vanishing node from the right.
-      lastNode.nextSibling.removeAttribute('vanishing');
-    } else {
-      // Push a new item at the right end.
-      this.appendChild(this.renderThumbnail_(this.lastVisibleIndex_));
-    }
-  } else {
-    // No items to the right, move the window to the left.
-    this.lastVisibleIndex_--;
-    if (this.firstVisibleIndex_) {
-      this.firstVisibleIndex_--;
-      var firstNode = persistentNodes[0];
-      if (firstNode.previousSibling) {
-        // Pull back a vanishing node from the left.
-        firstNode.previousSibling.removeAttribute('vanishing');
-      } else {
-        // Push a new item at the left end.
-        var newThumbnail = this.renderThumbnail_(this.firstVisibleIndex_);
-        newThumbnail.style.marginLeft = -(this.clientHeight - 2) + 'px';
-        this.insertBefore(newThumbnail, this.firstChild);
-        setTimeout(function() {
-          newThumbnail.style.marginLeft = '0';
-        }, 0);
-      }
-    }
-  }
-
-  removed.removeAttribute('selected');
-  removed.setAttribute('vanishing', 'smooth');
-  this.scheduleRemove_();
-};
-
-/**
- * Selection change handler.
- * @private
- */
-Ribbon.prototype.onSelection_ = function() {
-  var indexes = this.selectionModel_.selectedIndexes;
-  if (indexes.length == 0)
-    return;  // Ignore temporary empty selection.
-  var selectedIndex = indexes[0];
-
-  var length = this.dataModel_.length;
-
-  // TODO(dgozman): use margin instead of 2 here.
-  var itemWidth = this.clientHeight - 2;
-  var fullItems = Ribbon.ITEMS_COUNT;
-  fullItems = Math.min(fullItems, length);
-  var right = Math.floor((fullItems - 1) / 2);
-
-  var fullWidth = fullItems * itemWidth;
-  this.style.width = fullWidth + 'px';
-
-  var lastIndex = selectedIndex + right;
-  lastIndex = Math.max(lastIndex, fullItems - 1);
-  lastIndex = Math.min(lastIndex, length - 1);
-  var firstIndex = lastIndex - fullItems + 1;
-
-  if (this.firstVisibleIndex_ != firstIndex ||
-      this.lastVisibleIndex_ != lastIndex) {
-
-    if (this.lastVisibleIndex_ == -1) {
-      this.firstVisibleIndex_ = firstIndex;
-      this.lastVisibleIndex_ = lastIndex;
-    }
-
-    this.removeVanishing_();
-
-    this.textContent = '';
-    var startIndex = Math.min(firstIndex, this.firstVisibleIndex_);
-    // All the items except the first one treated equally.
-    for (var index = startIndex + 1;
-         index <= Math.max(lastIndex, this.lastVisibleIndex_);
-         ++index) {
-      // Only add items that are in either old or the new viewport.
-      if (this.lastVisibleIndex_ < index && index < firstIndex ||
-          lastIndex < index && index < this.firstVisibleIndex_)
-        continue;
-      var box = this.renderThumbnail_(index);
-      box.style.marginLeft = '0';
-      this.appendChild(box);
-      if (index < firstIndex || index > lastIndex) {
-        // If the node is not in the new viewport we only need it while
-        // the animation is playing out.
-        box.setAttribute('vanishing', 'slide');
-      }
-    }
-
-    var slideCount = this.childNodes.length + 1 - Ribbon.ITEMS_COUNT;
-    var margin = itemWidth * slideCount;
-    var startBox = this.renderThumbnail_(startIndex);
-    if (startIndex == firstIndex) {
-      // Sliding to the right.
-      startBox.style.marginLeft = -margin + 'px';
-      if (this.firstChild)
-        this.insertBefore(startBox, this.firstChild);
-      else
-        this.appendChild(startBox);
-      setTimeout(function() {
-        startBox.style.marginLeft = '0';
-      }, 0);
-    } else {
-      // Sliding to the left. Start item will become invisible and should be
-      // removed afterwards.
-      startBox.setAttribute('vanishing', 'slide');
-      startBox.style.marginLeft = '0';
-      if (this.firstChild)
-        this.insertBefore(startBox, this.firstChild);
-      else
-        this.appendChild(startBox);
-      setTimeout(function() {
-        startBox.style.marginLeft = -margin + 'px';
-      }, 0);
-    }
-
-    ImageUtil.setClass(this, 'fade-left',
-        firstIndex > 0 && selectedIndex != firstIndex);
-
-    ImageUtil.setClass(this, 'fade-right',
-        lastIndex < length - 1 && selectedIndex != lastIndex);
-
-    this.firstVisibleIndex_ = firstIndex;
-    this.lastVisibleIndex_ = lastIndex;
-
-    this.scheduleRemove_();
-  }
-
-  var oldSelected = this.querySelector('[selected]');
-  if (oldSelected) oldSelected.removeAttribute('selected');
-
-  var newSelected =
-      this.renderCache_[this.dataModel_.item(selectedIndex).getUrl()];
-  if (newSelected) newSelected.setAttribute('selected', true);
-};
-
-/**
- * Schedule the removal of thumbnails marked as vanishing.
- * @private
- */
-Ribbon.prototype.scheduleRemove_ = function() {
-  if (this.removeTimeout_)
-    clearTimeout(this.removeTimeout_);
-
-  this.removeTimeout_ = setTimeout(function() {
-    this.removeTimeout_ = null;
-    this.removeVanishing_();
-  }.bind(this), 200);
-};
-
-/**
- * Remove all thumbnails marked as vanishing.
- * @private
- */
-Ribbon.prototype.removeVanishing_ = function() {
-  if (this.removeTimeout_) {
-    clearTimeout(this.removeTimeout_);
-    this.removeTimeout_ = 0;
-  }
-  var vanishingNodes = this.querySelectorAll('[vanishing]');
-  for (var i = 0; i != vanishingNodes.length; i++) {
-    vanishingNodes[i].removeAttribute('vanishing');
-    this.removeChild(vanishingNodes[i]);
-  }
-};
-
-/**
- * Create a DOM element for a thumbnail.
- *
- * @param {number} index Item index.
- * @return {Element} Newly created element.
- * @private
- */
-Ribbon.prototype.renderThumbnail_ = function(index) {
-  var item = this.dataModel_.item(index);
-  var url = item.getUrl();
-
-  var cached = this.renderCache_[url];
-  if (cached) {
-    var img = cached.querySelector('img');
-    if (img)
-      img.classList.add('cached');
-    return cached;
-  }
-
-  var thumbnail = this.ownerDocument.createElement('div');
-  thumbnail.className = 'ribbon-image';
-  thumbnail.addEventListener('click', function() {
-    var index = this.dataModel_.indexOf(item);
-    this.selectionModel_.unselectAll();
-    this.selectionModel_.setIndexSelected(index, true);
-  }.bind(this));
-
-  util.createChild(thumbnail, 'image-wrapper');
-
-  this.metadataCache_.get(url, Gallery.METADATA_TYPE,
-      this.setThumbnailImage_.bind(this, thumbnail, url));
-
-  // TODO: Implement LRU eviction.
-  // Never evict the thumbnails that are currently in the DOM because we rely
-  // on this cache to find them by URL.
-  this.renderCache_[url] = thumbnail;
-  return thumbnail;
-};
-
-/**
- * Set the thumbnail image.
- *
- * @param {Element} thumbnail Thumbnail element.
- * @param {string} url Image url.
- * @param {Object} metadata Metadata.
- * @private
- */
-Ribbon.prototype.setThumbnailImage_ = function(thumbnail, url, metadata) {
-  new ThumbnailLoader(url, ThumbnailLoader.LoaderType.IMAGE, metadata).load(
-      thumbnail.querySelector('.image-wrapper'),
-      ThumbnailLoader.FillMode.FILL /* fill */,
-      ThumbnailLoader.OptimizationMode.NEVER_DISCARD);
-};
-
-/**
- * Content change handler.
- *
- * @param {Event} event Event.
- * @private
- */
-Ribbon.prototype.onContentChange_ = function(event) {
-  var url = event.item.getUrl();
-  this.remapCache_(event.oldUrl, url);
-
-  var thumbnail = this.renderCache_[url];
-  if (thumbnail && event.metadata)
-    this.setThumbnailImage_(thumbnail, url, event.metadata);
-};
-
-/**
- * Update the thumbnail element cache.
- *
- * @param {string} oldUrl Old url.
- * @param {string} newUrl New url.
- * @private
- */
-Ribbon.prototype.remapCache_ = function(oldUrl, newUrl) {
-  if (oldUrl != newUrl && (oldUrl in this.renderCache_)) {
-    this.renderCache_[newUrl] = this.renderCache_[oldUrl];
-    delete this.renderCache_[oldUrl];
-  }
-};