src/ui/app_list/app_list_model.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "ui/app_list/app_list_model.h"
   6
   7 #include <string>
   8
   9 #include "ui/app_list/app_list_folder_item.h"
  10 #include "ui/app_list/app_list_item.h"
  11 #include "ui/app_list/app_list_model_observer.h"
  12 #include "ui/app_list/search_box_model.h"
  13
  14 namespace app_list {
  15
  16 AppListModel::AppListModel()
  17     : top_level_item_list_(new AppListItemList),
  18       search_box_(new SearchBoxModel),
  19       results_(new SearchResults),
  20       status_(STATUS_NORMAL),
  21       folders_enabled_(false) {
  22   top_level_item_list_->AddObserver(this);
  23 }
  24
  25 AppListModel::~AppListModel() { top_level_item_list_->RemoveObserver(this); }
  26
  27 void AppListModel::AddObserver(AppListModelObserver* observer) {
  28   observers_.AddObserver(observer);
  29 }
  30
  31 void AppListModel::RemoveObserver(AppListModelObserver* observer) {
  32   observers_.RemoveObserver(observer);
  33 }
  34
  35 void AppListModel::SetStatus(Status status) {
  36   if (status_ == status)
  37     return;
  38
  39   status_ = status;
  40   FOR_EACH_OBSERVER(AppListModelObserver,
  41                     observers_,
  42                     OnAppListModelStatusChanged());
  43 }
  44
  45 AppListItem* AppListModel::FindItem(const std::string& id) {
  46   AppListItem* item = top_level_item_list_->FindItem(id);
  47   if (item)
  48     return item;
  49   for (size_t i = 0; i < top_level_item_list_->item_count(); ++i) {
  50     AppListItem* child_item =
  51         top_level_item_list_->item_at(i)->FindChildItem(id);
  52     if (child_item)
  53       return child_item;
  54   }
  55   return NULL;
  56 }
  57
  58 AppListFolderItem* AppListModel::FindFolderItem(const std::string& id) {
  59   AppListItem* item = top_level_item_list_->FindItem(id);
  60   if (item && item->GetItemType() == AppListFolderItem::kItemType)
  61     return static_cast<AppListFolderItem*>(item);
  62   DCHECK(!item);
  63   return NULL;
  64 }
  65
  66 AppListItem* AppListModel::AddItem(scoped_ptr<AppListItem> item) {
  67   DCHECK(!item->IsInFolder());
  68   DCHECK(!top_level_item_list()->FindItem(item->id()));
  69   return AddItemToItemListAndNotify(item.Pass());
  70 }
  71
  72 AppListItem* AppListModel::AddItemToFolder(scoped_ptr<AppListItem> item,
  73                                            const std::string& folder_id) {
  74   if (folder_id.empty())
  75     return AddItem(item.Pass());
  76   DVLOG(2) << "AddItemToFolder: " << item->id() << ": " << folder_id;
  77   CHECK_NE(folder_id, item->folder_id());
  78   DCHECK_NE(AppListFolderItem::kItemType, item->GetItemType());
  79   AppListFolderItem* dest_folder = FindOrCreateFolderItem(folder_id);
  80   if (!dest_folder)
  81     return NULL;
  82   DCHECK(!dest_folder->item_list()->FindItem(item->id()))
  83       << "Already in folder: " << dest_folder->id();
  84   return AddItemToFolderItemAndNotify(dest_folder, item.Pass());
  85 }
  86
  87 const std::string AppListModel::MergeItems(const std::string& target_item_id,
  88                                            const std::string& source_item_id) {
  89   if (!folders_enabled()) {
  90     LOG(ERROR) << "MergeItems called with folders disabled.";
  91     return "";
  92   }
  93   DVLOG(2) << "MergeItems: " << source_item_id << " -> " << target_item_id;
  94   // Find the target item.
  95   AppListItem* target_item = FindItem(target_item_id);
  96   if (!target_item) {
  97     LOG(ERROR) << "MergeItems: Target no longer exists.";
  98     return "";
  99   }
 100   CHECK(target_item->folder_id().empty());
 101
 102   AppListItem* source_item = FindItem(source_item_id);
 103   if (!source_item) {
 104     LOG(ERROR) << "MergeItems: Source no longer exists.";
 105     return "";
 106   }
 107
 108   // If the target item is a folder, just add the source item to it.
 109   if (target_item->GetItemType() == AppListFolderItem::kItemType) {
 110     AppListFolderItem* target_folder =
 111         static_cast<AppListFolderItem*>(target_item);
 112     if (target_folder->folder_type() == AppListFolderItem::FOLDER_TYPE_OEM) {
 113       LOG(WARNING) << "MergeItems called with OEM folder as target";
 114       return "";
 115     }
 116     scoped_ptr<AppListItem> source_item_ptr = RemoveItem(source_item);
 117     source_item_ptr->set_position(
 118         target_folder->item_list()->CreatePositionBefore(
 119             syncer::StringOrdinal()));
 120     AddItemToFolderItemAndNotify(target_folder, source_item_ptr.Pass());
 121     return target_folder->id();
 122   }
 123
 124   // Otherwise remove the source item and target item from their current
 125   // location, they will become owned by the new folder.
 126   scoped_ptr<AppListItem> source_item_ptr = RemoveItem(source_item);
 127   CHECK(source_item_ptr);
 128   scoped_ptr<AppListItem> target_item_ptr =
 129       top_level_item_list_->RemoveItem(target_item_id);
 130   CHECK(target_item_ptr);
 131
 132   // Create a new folder in the same location as the target item.
 133   std::string new_folder_id = AppListFolderItem::GenerateId();
 134   DVLOG(2) << "Creating folder for merge: " << new_folder_id;
 135   scoped_ptr<AppListItem> new_folder_ptr(new AppListFolderItem(
 136       new_folder_id, AppListFolderItem::FOLDER_TYPE_NORMAL));
 137   new_folder_ptr->set_position(target_item_ptr->position());
 138   AppListFolderItem* new_folder = static_cast<AppListFolderItem*>(
 139       AddItemToItemListAndNotify(new_folder_ptr.Pass()));
 140
 141   // Add the items to the new folder.
 142   target_item_ptr->set_position(
 143       new_folder->item_list()->CreatePositionBefore(
 144           syncer::StringOrdinal()));
 145   AddItemToFolderItemAndNotify(new_folder, target_item_ptr.Pass());
 146   source_item_ptr->set_position(
 147       new_folder->item_list()->CreatePositionBefore(
 148           syncer::StringOrdinal()));
 149   AddItemToFolderItemAndNotify(new_folder, source_item_ptr.Pass());
 150
 151   return new_folder->id();
 152 }
 153
 154 void AppListModel::MoveItemToFolder(AppListItem* item,
 155                                     const std::string& folder_id) {
 156   DVLOG(2) << "MoveItemToFolder: " << folder_id
 157            << " <- " << item->ToDebugString();
 158   if (item->folder_id() == folder_id)
 159     return;
 160   AppListFolderItem* dest_folder = FindOrCreateFolderItem(folder_id);
 161   scoped_ptr<AppListItem> item_ptr = RemoveItem(item);
 162   if (dest_folder) {
 163     CHECK(!item->IsInFolder());
 164     AddItemToFolderItemAndNotify(dest_folder, item_ptr.Pass());
 165   } else {
 166     AddItemToItemListAndNotifyUpdate(item_ptr.Pass());
 167   }
 168 }
 169
 170 bool AppListModel::MoveItemToFolderAt(AppListItem* item,
 171                                       const std::string& folder_id,
 172                                       syncer::StringOrdinal position) {
 173   DVLOG(2) << "MoveItemToFolderAt: " << folder_id
 174            << "[" << position.ToDebugString() << "]"
 175            << " <- " << item->ToDebugString();
 176   if (item->folder_id() == folder_id)
 177     return false;
 178   AppListFolderItem* src_folder = FindOrCreateFolderItem(item->folder_id());
 179   if (src_folder &&
 180       src_folder->folder_type() == AppListFolderItem::FOLDER_TYPE_OEM) {
 181     LOG(WARNING) << "MoveItemToFolderAt called with OEM folder as source";
 182     return false;
 183   }
 184   AppListFolderItem* dest_folder = FindOrCreateFolderItem(folder_id);
 185   scoped_ptr<AppListItem> item_ptr = RemoveItem(item);
 186   if (dest_folder) {
 187     item_ptr->set_position(
 188         dest_folder->item_list()->CreatePositionBefore(position));
 189     AddItemToFolderItemAndNotify(dest_folder, item_ptr.Pass());
 190   } else {
 191     item_ptr->set_position(
 192         top_level_item_list_->CreatePositionBefore(position));
 193     AddItemToItemListAndNotifyUpdate(item_ptr.Pass());
 194   }
 195   return true;
 196 }
 197
 198 void AppListModel::SetItemPosition(AppListItem* item,
 199                                    const syncer::StringOrdinal& new_position) {
 200   if (!item->IsInFolder()) {
 201     top_level_item_list_->SetItemPosition(item, new_position);
 202     // Note: this will trigger OnListItemMoved which will signal observers.
 203     // (This is done this way because some View code still moves items within
 204     // the item list directly).
 205     return;
 206   }
 207   AppListFolderItem* folder = FindFolderItem(item->folder_id());
 208   DCHECK(folder);
 209   folder->item_list()->SetItemPosition(item, new_position);
 210   FOR_EACH_OBSERVER(AppListModelObserver,
 211                     observers_,
 212                     OnAppListItemUpdated(item));
 213 }
 214
 215 void AppListModel::SetItemName(AppListItem* item, const std::string& name) {
 216   item->SetName(name);
 217   DVLOG(2) << "AppListModel::SetItemName: " << item->ToDebugString();
 218   FOR_EACH_OBSERVER(AppListModelObserver,
 219                     observers_,
 220                     OnAppListItemUpdated(item));
 221 }
 222
 223 void AppListModel::SetItemNameAndShortName(AppListItem* item,
 224                                            const std::string& name,
 225                                            const std::string& short_name) {
 226   item->SetNameAndShortName(name, short_name);
 227   DVLOG(2) << "AppListModel::SetItemNameAndShortName: "
 228            << item->ToDebugString();
 229   FOR_EACH_OBSERVER(AppListModelObserver,
 230                     observers_,
 231                     OnAppListItemUpdated(item));
 232 }
 233
 234 void AppListModel::DeleteItem(const std::string& id) {
 235   AppListItem* item = FindItem(id);
 236   if (!item)
 237     return;
 238   if (!item->IsInFolder()) {
 239     DCHECK_EQ(0u, item->ChildItemCount())
 240         << "Invalid call to DeleteItem for item with children: " << id;
 241     FOR_EACH_OBSERVER(AppListModelObserver,
 242                       observers_,
 243                       OnAppListItemWillBeDeleted(item));
 244     top_level_item_list_->DeleteItem(id);
 245     FOR_EACH_OBSERVER(AppListModelObserver, observers_, OnAppListItemDeleted());
 246     return;
 247   }
 248   AppListFolderItem* folder = FindFolderItem(item->folder_id());
 249   DCHECK(folder) << "Folder not found for item: " << item->ToDebugString();
 250   scoped_ptr<AppListItem> child_item = RemoveItemFromFolder(folder, item);
 251   DCHECK_EQ(item, child_item.get());
 252   FOR_EACH_OBSERVER(AppListModelObserver,
 253                     observers_,
 254                     OnAppListItemWillBeDeleted(item));
 255   child_item.reset();  // Deletes item.
 256   FOR_EACH_OBSERVER(AppListModelObserver, observers_, OnAppListItemDeleted());
 257 }
 258
 259 void AppListModel::NotifyExtensionPreferenceChanged() {
 260   for (size_t i = 0; i < top_level_item_list_->item_count(); ++i)
 261     top_level_item_list_->item_at(i)->OnExtensionPreferenceChanged();
 262 }
 263
 264 void AppListModel::SetFoldersEnabled(bool folders_enabled) {
 265   folders_enabled_ = folders_enabled;
 266   if (folders_enabled)
 267     return;
 268   // Remove child items from folders.
 269   std::vector<std::string> folder_ids;
 270   for (size_t i = 0; i < top_level_item_list_->item_count(); ++i) {
 271     AppListItem* item = top_level_item_list_->item_at(i);
 272     if (item->GetItemType() != AppListFolderItem::kItemType)
 273       continue;
 274     AppListFolderItem* folder = static_cast<AppListFolderItem*>(item);
 275     if (folder->folder_type() == AppListFolderItem::FOLDER_TYPE_OEM)
 276       continue;  // Do not remove OEM folders.
 277     while (folder->item_list()->item_count()) {
 278       scoped_ptr<AppListItem> child = folder->item_list()->RemoveItemAt(0);
 279       child->set_folder_id("");
 280       AddItemToItemListAndNotifyUpdate(child.Pass());
 281     }
 282     folder_ids.push_back(folder->id());
 283   }
 284   // Delete folders.
 285   for (size_t i = 0; i < folder_ids.size(); ++i)
 286     DeleteItem(folder_ids[i]);
 287 }
 288
 289 std::vector<SearchResult*> AppListModel::FilterSearchResultsByDisplayType(
 290     SearchResults* results,
 291     SearchResult::DisplayType display_type,
 292     size_t max_results) {
 293   std::vector<SearchResult*> matches;
 294   for (size_t i = 0; i < results->item_count(); ++i) {
 295     SearchResult* item = results->GetItemAt(i);
 296     if (item->display_type() == display_type) {
 297       matches.push_back(item);
 298       if (matches.size() == max_results)
 299         break;
 300     }
 301   }
 302   return matches;
 303 }
 304
 305 // Private methods
 306
 307 void AppListModel::OnListItemMoved(size_t from_index,
 308                                    size_t to_index,
 309                                    AppListItem* item) {
 310   FOR_EACH_OBSERVER(AppListModelObserver,
 311                     observers_,
 312                     OnAppListItemUpdated(item));
 313 }
 314
 315 AppListFolderItem* AppListModel::FindOrCreateFolderItem(
 316     const std::string& folder_id) {
 317   if (folder_id.empty())
 318     return NULL;
 319
 320   AppListFolderItem* dest_folder = FindFolderItem(folder_id);
 321   if (dest_folder)
 322     return dest_folder;
 323
 324   if (!folders_enabled()) {
 325     LOG(ERROR) << "Attempt to create folder item when disabled: " << folder_id;
 326     return NULL;
 327   }
 328
 329   DVLOG(2) << "Creating new folder: " << folder_id;
 330   scoped_ptr<AppListFolderItem> new_folder(
 331       new AppListFolderItem(folder_id, AppListFolderItem::FOLDER_TYPE_NORMAL));
 332   new_folder->set_position(
 333       top_level_item_list_->CreatePositionBefore(syncer::StringOrdinal()));
 334   AppListItem* new_folder_item =
 335       AddItemToItemListAndNotify(new_folder.PassAs<AppListItem>());
 336   return static_cast<AppListFolderItem*>(new_folder_item);
 337 }
 338
 339 AppListItem* AppListModel::AddItemToItemListAndNotify(
 340     scoped_ptr<AppListItem> item_ptr) {
 341   DCHECK(!item_ptr->IsInFolder());
 342   AppListItem* item = top_level_item_list_->AddItem(item_ptr.Pass());
 343   FOR_EACH_OBSERVER(AppListModelObserver,
 344                     observers_,
 345                     OnAppListItemAdded(item));
 346   return item;
 347 }
 348
 349 AppListItem* AppListModel::AddItemToItemListAndNotifyUpdate(
 350     scoped_ptr<AppListItem> item_ptr) {
 351   DCHECK(!item_ptr->IsInFolder());
 352   AppListItem* item = top_level_item_list_->AddItem(item_ptr.Pass());
 353   FOR_EACH_OBSERVER(AppListModelObserver,
 354                     observers_,
 355                     OnAppListItemUpdated(item));
 356   return item;
 357 }
 358
 359 AppListItem* AppListModel::AddItemToFolderItemAndNotify(
 360     AppListFolderItem* folder,
 361     scoped_ptr<AppListItem> item_ptr) {
 362   CHECK_NE(folder->id(), item_ptr->folder_id());
 363   AppListItem* item = folder->item_list()->AddItem(item_ptr.Pass());
 364   item->set_folder_id(folder->id());
 365   FOR_EACH_OBSERVER(AppListModelObserver,
 366                     observers_,
 367                     OnAppListItemUpdated(item));
 368   return item;
 369 }
 370
 371 scoped_ptr<AppListItem> AppListModel::RemoveItem(AppListItem* item) {
 372   if (!item->IsInFolder())
 373     return top_level_item_list_->RemoveItem(item->id());
 374
 375   AppListFolderItem* folder = FindFolderItem(item->folder_id());
 376   return RemoveItemFromFolder(folder, item);
 377 }
 378
 379 scoped_ptr<AppListItem> AppListModel::RemoveItemFromFolder(
 380     AppListFolderItem* folder,
 381     AppListItem* item) {
 382   std::string folder_id = folder->id();
 383   CHECK_EQ(item->folder_id(), folder_id);
 384   scoped_ptr<AppListItem> result = folder->item_list()->RemoveItem(item->id());
 385   result->set_folder_id("");
 386   if (folder->item_list()->item_count() == 0) {
 387     DVLOG(2) << "Deleting empty folder: " << folder->ToDebugString();
 388     DeleteItem(folder_id);
 389   }
 390   return result.Pass();
 391 }
 392
 393 }  // namespace app_list