Quick View: Add functinoality to show generic metadata (size and modificationTime).

ui/file_manager/file_manager/foreground/js/metadata_box_controller.js

Index: ui/file_manager/file_manager/foreground/js/metadata_box_controller.js
diff --git a/ui/file_manager/file_manager/foreground/js/metadata_box_controller.js b/ui/file_manager/file_manager/foreground/js/metadata_box_controller.js
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index 0000000000000000000000000000000000000000..f3fc4e8e68aae79e364f2c1d9fcd8208bcc36347
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+++ b/ui/file_manager/file_manager/foreground/js/metadata_box_controller.js
@@ -0,0 +1,89 @@
+// Copyright 2016 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.
+
+/**
+ * Controller of metadata box.
+ *
+ * @param{!MetadataModel} metadataModel
+ * @param{!FilesMetadataBox} metadataBox
+ * @param{!FilesQuickView} quickView
+ * @param{!QuickViewModel} quickViewModel
+ *
+ * @constructor
+ */
+function MetadataBoxController(
+    metadataModel, metadataBox, quickView, quickViewModel) {
+  /**
+   * @type {!MetadataModel}
+   * @private
+   */
+  this.metadataModel_ = metadataModel;
+
+  /**
+   * @type {!FilesMetadataBox}
+   * @private
+   */
+  this.metadataBox_ = metadataBox;
+
+  /**
+   * @type {!FilesQuickView}
+   * @private
+   */
+  this.quickView_ = quickView;
+
+  // TODO(oka): Add storage to persist the value of
+  // quickViewModel_.metadataBoxActive.
+  /**
+   * @type {!QuickViewModel}
+   * @private
+   */
+  this.quickViewModel_ = quickViewModel;
+
+  quickView.addEventListener(
+      'metadata-box-active-changed', this.updateView_.bind(this));
+
+  quickViewModel.addEventListener(
+      'selected-entry-changed', this.updateView_.bind(this));
+}
+
+/**
+ * @const {!Array<string>}
+ */
+MetadataBoxController.GENERAL_METADATA_NAME = [
+  'size',
+  'modificationTime',
+];
+
+/**
+ * Update the view of metadata box.
+ *
+ * @private
+ */
+MetadataBoxController.prototype.updateView_ = function() {
+  if (!this.quickView_.metadataBoxActive) {
+    return;
+  }
+  var entry = assert(this.quickViewModel_.getSelectedEntry());
+  this.metadataModel_.get([entry], MetadataBoxController.GENERAL_METADATA_NAME)
+      .then(this.onGeneralMetadataLoaded_.bind(this, entry));
+
+  // TODO(oka): Add file type specific metadata.
+};
+
+/**
+ * Update metadata box with general file information.
+ *
+ * @param{!FileEntry} entry
+ * @param{!Array<!MetadataItem>} items
+ * @private
+ */
+MetadataBoxController.prototype.onGeneralMetadataLoaded_ = function(
+    entry, items) {
+  // TODO(oka): Format size and modificationTime using fileMetadataFormatter.
+  var item = items[0];
+  if (item.size)
+    this.metadataBox_.size = item.size;
+  if (item.modificationTime)
+    this.metadataBox_.modificationTime = item.modificationTime;
+};