mash: Cleanup ash shelf application menu code.

chrome/browser/ui/ash/launcher/launcher_application_menu_item_model.cc

-// 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.
-
-#include "chrome/browser/ui/ash/launcher/launcher_application_menu_item_model.h"
-
-#include <stddef.h>
-
-#include <utility>
-
-#include "base/metrics/histogram_macros.h"
-#include "chrome/browser/ui/ash/launcher/chrome_launcher_app_menu_item.h"
-
-namespace {
-
-const char kNumItemsEnabledHistogramName[] =
-    "Ash.Shelf.Menu.NumItemsEnabledUponSelection";
-
-const char kSelectedMenuItemIndexHistogramName[] =
-    "Ash.Shelf.Menu.SelectedMenuItemIndex";
-
-}  // namespace
-
-LauncherApplicationMenuItemModel::LauncherApplicationMenuItemModel(
-    ChromeLauncherAppMenuItems item_list)
-    : ui::SimpleMenuModel(this), launcher_items_(std::move(item_list)) {
-  Build();
-}
-
-LauncherApplicationMenuItemModel::~LauncherApplicationMenuItemModel() {}
-
-bool LauncherApplicationMenuItemModel::IsCommandIdChecked(
-    int command_id) const {
-  return false;
-}
-
-bool LauncherApplicationMenuItemModel::IsCommandIdEnabled(
-    int command_id) const {
-  DCHECK(command_id < static_cast<int>(launcher_items_.size()));
-  return launcher_items_[command_id]->IsEnabled();
-}
-
-void LauncherApplicationMenuItemModel::ExecuteCommand(int command_id,
-                                                      int event_flags) {
-  DCHECK(command_id < static_cast<int>(launcher_items_.size()));
-  launcher_items_[command_id]->Execute(event_flags);
-  RecordMenuItemSelectedMetrics(command_id, GetNumMenuItemsEnabled());
-}
-
-void LauncherApplicationMenuItemModel::Build() {
-  if (launcher_items_.empty())
-    return;
-
-  AddSeparator(ui::SPACING_SEPARATOR);
-  for (size_t i = 0; i < launcher_items_.size(); i++) {
-    ChromeLauncherAppMenuItem* item = launcher_items_[i].get();
-
-    // Check for a separator requirement in front of this item.
-    if (item->HasLeadingSeparator())
-      AddSeparator(ui::SPACING_SEPARATOR);
-
-    // The first item is the context menu, the others are the running apps.
-    AddItem(i, item->title());
-
-    if (!item->icon().IsEmpty())
-      SetIcon(GetIndexOfCommandId(i), item->icon());
-  }
-  AddSeparator(ui::SPACING_SEPARATOR);
-}
-
-int LauncherApplicationMenuItemModel::GetNumMenuItemsEnabled() const {
-  int num_menu_items_enabled = 0;
-  for (const auto& menu_item : launcher_items_) {
-    if (menu_item->IsEnabled())
-      ++num_menu_items_enabled;
-  }
-  return num_menu_items_enabled;
-}
-
-void LauncherApplicationMenuItemModel::RecordMenuItemSelectedMetrics(
-    int command_id,
-    int num_menu_items_enabled) {
-  UMA_HISTOGRAM_COUNTS_100(kSelectedMenuItemIndexHistogramName, command_id);
-  UMA_HISTOGRAM_COUNTS_100(kNumItemsEnabledHistogramName,
-                           num_menu_items_enabled);
-}