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

chrome/browser/resources/file_manager/js/file_grid.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';
-
-/**
- * FileGrid constructor.
- *
- * Represents grid for the Grid Vew in the File Manager.
- * @constructor
- * @extends {cr.ui.Grid}
- */
-
-function FileGrid() {
-  throw new Error('Use FileGrid.decorate');
-}
-
-/**
- * Thumbnail quality.
- * @enum {number}
- */
-FileGrid.ThumbnailQuality = {
-  LOW: 0,
-  HIGH: 1
-};
-
-/**
- * Inherits from cr.ui.Grid.
- */
-FileGrid.prototype.__proto__ = cr.ui.Grid.prototype;
-
-/**
- * Decorates an HTML element to be a FileGrid.
- * @param {HTMLElement} self The grid to decorate.
- * @param {MetadataCache} metadataCache Metadata cache to find entries
- *                                      metadata.
- */
-FileGrid.decorate = function(self, metadataCache) {
-  cr.ui.Grid.decorate(self);
-  self.__proto__ = FileGrid.prototype;
-  self.metadataCache_ = metadataCache;
-
-  self.scrollBar_ = new MainPanelScrollBar();
-  self.scrollBar_.initialize(self.parentNode, self);
-  self.setBottomMarginForPanel(0);
-
-  self.itemConstructor = function(entry) {
-    var item = self.ownerDocument.createElement('LI');
-    FileGrid.Item.decorate(item, entry, self);
-    return item;
-  };
-
-  self.relayoutAggregation_ =
-      new AsyncUtil.Aggregation(self.relayoutImmediately_.bind(self));
-};
-
-/**
- * Updates items to reflect metadata changes.
- * @param {string} type Type of metadata changed.
- * @param {Object.<string, Object>} props Map from entry URLs to metadata props.
- */
-FileGrid.prototype.updateListItemsMetadata = function(type, props) {
-  var boxes = this.querySelectorAll('.img-container');
-  for (var i = 0; i < boxes.length; i++) {
-    var box = boxes[i];
-    var entry = this.dataModel.item(this.getListItemAncestor(box));
-    if (!entry || !(entry.toURL() in props))
-      continue;
-
-    FileGrid.decorateThumbnailBox(box,
-                                  entry,
-                                  this.metadataCache_,
-                                  ThumbnailLoader.FillMode.FIT,
-                                  FileGrid.ThumbnailQuality.HIGH);
-  }
-};
-
-/**
- * Redraws the UI. Skips multiple consecutive calls.
- */
-FileGrid.prototype.relayout = function() {
-  this.relayoutAggregation_.run();
-};
-
-/**
- * Redraws the UI immediately.
- * @private
- */
-FileGrid.prototype.relayoutImmediately_ = function() {
-  this.startBatchUpdates();
-  this.columns = 0;
-  this.redraw();
-  this.endBatchUpdates();
-  cr.dispatchSimpleEvent(this, 'relayout');
-};
-
-/**
- * Decorates thumbnail.
- * @param {HTMLElement} li List item.
- * @param {Entry} entry Entry to render a thumbnail for.
- * @param {MetadataCache} metadataCache To retrieve metadata.
- */
-FileGrid.decorateThumbnail = function(li, entry, metadataCache) {
-  li.className = 'thumbnail-item';
-  if (entry)
-    filelist.decorateListItem(li, entry, metadataCache);
-
-  var frame = li.ownerDocument.createElement('div');
-  frame.className = 'thumbnail-frame';
-  li.appendChild(frame);
-
-  var box = li.ownerDocument.createElement('div');
-  if (entry) {
-    FileGrid.decorateThumbnailBox(box,
-                                  entry,
-                                  metadataCache,
-                                  ThumbnailLoader.FillMode.AUTO,
-                                  FileGrid.ThumbnailQuality.HIGH);
-  }
-  frame.appendChild(box);
-
-  var bottom = li.ownerDocument.createElement('div');
-  bottom.className = 'thumbnail-bottom';
-  bottom.appendChild(filelist.renderFileNameLabel(li.ownerDocument, entry));
-  frame.appendChild(bottom);
-};
-
-/**
- * Decorates the box containing a centered thumbnail image.
- *
- * @param {HTMLDivElement} box Box to decorate.
- * @param {Entry} entry Entry which thumbnail is generating for.
- * @param {MetadataCache} metadataCache To retrieve metadata.
- * @param {ThumbnailLoader.FillMode} fillMode Fill mode.
- * @param {FileGrid.ThumbnailQuality} quality Thumbnail quality.
- * @param {function(HTMLElement)=} opt_imageLoadCallback Callback called when
- *     the image has been loaded before inserting it into the DOM.
- */
-FileGrid.decorateThumbnailBox = function(
-    box, entry, metadataCache, fillMode, quality, opt_imageLoadCallback) {
-  box.className = 'img-container';
-  if (entry.isDirectory) {
-    box.setAttribute('generic-thumbnail', 'folder');
-    if (opt_imageLoadCallback)
-      setTimeout(opt_imageLoadCallback, 0, null /* callback parameter */);
-    return;
-  }
-
-  var imageUrl = entry.toURL();
-  var metadataTypes = 'thumbnail|filesystem';
-
-  if (FileType.isOnDrive(imageUrl)) {
-    metadataTypes += '|drive';
-  } else {
-    // TODO(dgozman): If we ask for 'media' for a Drive file we fall into an
-    // infinite loop.
-    metadataTypes += '|media';
-  }
-
-  // Drive provides high quality thumbnails via USE_EMBEDDED, however local
-  // images usually provide very tiny thumbnails, therefore USE_EMBEDDE can't
-  // be used to obtain high quality output.
-  var useEmbedded;
-  switch (quality) {
-    case FileGrid.ThumbnailQuality.LOW:
-      useEmbedded = ThumbnailLoader.UseEmbedded.USE_EMBEDDED;
-      break;
-    case FileGrid.ThumbnailQuality.HIGH:
-      useEmbedded = FileType.isOnDrive(imageUrl) ?
-          ThumbnailLoader.UseEmbedded.USE_EMBEDDED :
-          ThumbnailLoader.UseEmbedded.NO_EMBEDDED;
-      break;
-  }
-
-  metadataCache.get(imageUrl, metadataTypes,
-      function(metadata) {
-        new ThumbnailLoader(imageUrl,
-                            ThumbnailLoader.LoaderType.IMAGE,
-                            metadata,
-                            undefined,  // opt_mediaType
-                            useEmbedded).
-            load(box,
-                fillMode,
-                ThumbnailLoader.OptimizationMode.DISCARD_DETACHED,
-                opt_imageLoadCallback);
-      });
-};
-
-/**
- * Item for the Grid View.
- * @constructor
- */
-FileGrid.Item = function() {
-  throw new Error();
-};
-
-/**
- * Inherits from cr.ui.ListItem.
- */
-FileGrid.Item.prototype.__proto__ = cr.ui.ListItem.prototype;
-
-Object.defineProperty(FileGrid.Item.prototype, 'label', {
-  /**
-   * @this {FileGrid.Item}
-   * @return {string} Label of the item.
-   */
-  get: function() {
-    return this.querySelector('filename-label').textContent;
-  }
-});
-
-/**
- * @param {Element} li List item element.
- * @param {Entry} entry File entry.
- * @param {FileGrid} grid Owner.
- */
-FileGrid.Item.decorate = function(li, entry, grid) {
-  li.__proto__ = FileGrid.Item.prototype;
-  FileGrid.decorateThumbnail(li, entry, grid.metadataCache_, true);
-
-  // Override the default role 'listitem' to 'option' to match the parent's
-  // role (listbox).
-  li.setAttribute('role', 'option');
-};
-
-/**
- * Sets the margin height for the transparent preview panel at the bottom.
- * @param {number} margin Margin to be set in px.
- */
-FileGrid.prototype.setBottomMarginForPanel = function(margin) {
-  // +20 bottom margin is needed to match the bottom margin size with the
-  // margin between its items.
-  this.style.paddingBottom = (margin + 20) + 'px';
-  this.scrollBar_.setBottomMarginForPanel(margin);
-};
-
-/**
- * Obtains if the drag selection should be start or not by referring the mouse
- * event.
- * @param {MouseEvent} event Drag start event.
- * @return {boolean} True if the mouse is hit to the background of the list.
- */
-FileGrid.prototype.shouldStartDragSelection = function(event) {
-  var pos = DragSelector.getScrolledPosition(this, event);
-  return this.getHitElements(pos.x, pos.y).length == 0;
-};
-
-/**
- * Obtains the column/row index that the coordinate points.
- * @param {number} coordinate Vertical/horizontal coodinate value that points
- *     column/row.
- * @param {number} step Length from a column/row to the next one.
- * @param {number} threshold Threshold that determinds whether 1 offset is added
- *     to the return value or not. This is used in order to handle the margin of
- *     column/row.
- * @return {number} Index of hit column/row.
- * @private
- */
-FileGrid.prototype.getHitIndex_ = function(coordinate, step, threshold) {
-  var index = ~~(coordinate / step);
-  return (coordinate % step >= threshold) ? index + 1 : index;
-};
-
-/**
- * Obtains the index list of elements that are hit by the point or the
- * rectangle.
- *
- * We should match its argument interface with FileList.getHitElements.
- *
- * @param {number} x X coordinate value.
- * @param {number} y Y coordinate value.
- * @param {=number} opt_width Width of the coordinate.
- * @param {=number} opt_height Height of the coordinate.
- * @return {Array.<number>} Index list of hit elements.
- */
-FileGrid.prototype.getHitElements = function(x, y, opt_width, opt_height) {
-  var currentSelection = [];
-  var right = x + (opt_width || 0);
-  var bottom = y + (opt_height || 0);
-  var itemMetrics = this.measureItem();
-  var horizontalStartIndex = this.getHitIndex_(
-      x, itemMetrics.width, itemMetrics.width - itemMetrics.marginRight);
-  var horizontalEndIndex = Math.min(this.columns, this.getHitIndex_(
-      right, itemMetrics.width, itemMetrics.marginLeft));
-  var verticalStartIndex = this.getHitIndex_(
-      y, itemMetrics.height, itemMetrics.height - itemMetrics.bottom);
-  var verticalEndIndex = this.getHitIndex_(
-      bottom, itemMetrics.height, itemMetrics.marginTop);
-  for (var verticalIndex = verticalStartIndex;
-       verticalIndex < verticalEndIndex;
-       verticalIndex++) {
-    var indexBase = this.getFirstItemInRow(verticalIndex);
-    for (var horizontalIndex = horizontalStartIndex;
-         horizontalIndex < horizontalEndIndex;
-         horizontalIndex++) {
-      var index = indexBase + horizontalIndex;
-      if (0 <= index && index < this.dataModel.length)
-        currentSelection.push(index);
-    }
-  }
-  return currentSelection;
-};