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       state_(INVALID_STATE),
  22       folders_enabled_(false),
  23       custom_launcher_page_enabled_(true),
  24       search_engine_is_google_(false) {
  25   top_level_item_list_->AddObserver(this);
  26 }
  27
  28 AppListModel::~AppListModel() { top_level_item_list_->RemoveObserver(this); }
  29
  30 void AppListModel::AddObserver(AppListModelObserver* observer) {
  31   observers_.AddObserver(observer);
  32 }
  33
  34 void AppListModel::RemoveObserver(AppListModelObserver* observer) {
  35   observers_.RemoveObserver(observer);
  36 }
  37
  38 void AppListModel::SetStatus(Status status) {
  39   if (status_ == status)
  40     return;
  41
  42   status_ = status;
  43   FOR_EACH_OBSERVER(AppListModelObserver,
  44                     observers_,
  45                     OnAppListModelStatusChanged());
  46 }
  47
  48 void AppListModel::SetState(State state) {
  49   if (state_ == state)
  50     return;
  51
  52   State old_state = state_;
  53
  54   state_ = state;
  55
  56   FOR_EACH_OBSERVER(AppListModelObserver,
  57                     observers_,
  58                     OnAppListModelStateChanged(old_state, state_));
  59 }
  60
  61 AppListItem* AppListModel::FindItem(const std::string& id) {
  62   AppListItem* item = top_level_item_list_->FindItem(id);
  63   if (item)
  64     return item;
  65   for (size_t i = 0; i < top_level_item_list_->item_count(); ++i) {
  66     AppListItem* child_item =
  67         top_level_item_list_->item_at(i)->FindChildItem(id);
  68     if (child_item)
  69       return child_item;
  70   }
  71   return NULL;
  72 }
  73
  74 AppListFolderItem* AppListModel::FindFolderItem(const std::string& id) {
  75   AppListItem* item = top_level_item_list_->FindItem(id);
  76   if (item && item->GetItemType() == AppListFolderItem::kItemType)
  77     return static_cast<AppListFolderItem*>(item);
  78   DCHECK(!item);
  79   return NULL;
  80 }
  81
  82 AppListItem* AppListModel::AddItem(scoped_ptr<AppListItem> item) {
  83   DCHECK(!item->IsInFolder());
  84   DCHECK(!top_level_item_list()->FindItem(item->id()));
  85   return AddItemToItemListAndNotify(item.Pass());
  86 }
  87
  88 AppListItem* AppListModel::AddItemToFolder(scoped_ptr<AppListItem> item,
  89                                            const std::string& folder_id) {
  90   if (folder_id.empty())
  91     return AddItem(item.Pass());
  92   DVLOG(2) << "AddItemToFolder: " << item->id() << ": " << folder_id;
  93   CHECK_NE(folder_id, item->folder_id());
  94   DCHECK_NE(AppListFolderItem::kItemType, item->GetItemType());
  95   AppListFolderItem* dest_folder = FindOrCreateFolderItem(folder_id);
  96   if (!dest_folder)
  97     return NULL;
  98   DCHECK(!dest_folder->item_list()->FindItem(item->id()))
  99       << "Already in folder: " << dest_folder->id();
 100   return AddItemToFolderItemAndNotify(dest_folder, item.Pass());
 101 }
 102
 103 const std::string AppListModel::MergeItems(const std::string& target_item_id,
 104                                            const std::string& source_item_id) {
 105   if (!folders_enabled()) {
 106     LOG(ERROR) << "MergeItems called with folders disabled.";
 107     return "";
 108   }
 109   DVLOG(2) << "MergeItems: " << source_item_id << " -> " << target_item_id;
 110
 111   if (target_item_id == source_item_id) {
 112     LOG(WARNING) << "MergeItems tried to drop item onto itself ("
 113                  << source_item_id << " -> " << target_item_id << ").";
 114     return "";
 115   }
 116
 117   // Find the target item.
 118   AppListItem* target_item = top_level_item_list_->FindItem(target_item_id);
 119   if (!target_item) {
 120     LOG(ERROR) << "MergeItems: Target no longer exists.";
 121     return "";
 122   }
 123
 124   AppListItem* source_item = FindItem(source_item_id);
 125   if (!source_item) {
 126     LOG(ERROR) << "MergeItems: Source no longer exists.";
 127     return "";
 128   }
 129
 130   // If the target item is a folder, just add the source item to it.
 131   if (target_item->GetItemType() == AppListFolderItem::kItemType) {
 132     AppListFolderItem* target_folder =
 133         static_cast<AppListFolderItem*>(target_item);
 134     if (target_folder->folder_type() == AppListFolderItem::FOLDER_TYPE_OEM) {
 135       LOG(WARNING) << "MergeItems called with OEM folder as target";
 136       return "";
 137     }
 138     scoped_ptr<AppListItem> source_item_ptr = RemoveItem(source_item);
 139     source_item_ptr->set_position(
 140         target_folder->item_list()->CreatePositionBefore(
 141             syncer::StringOrdinal()));
 142     AddItemToFolderItemAndNotify(target_folder, source_item_ptr.Pass());
 143     return target_folder->id();
 144   }
 145
 146   // Otherwise remove the source item and target item from their current
 147   // location, they will become owned by the new folder.
 148   scoped_ptr<AppListItem> source_item_ptr = RemoveItem(source_item);
 149   CHECK(source_item_ptr);
 150   // Note: This would fail if |target_item_id == source_item_id|, except we
 151   // checked that they are distinct at the top of this method.
 152   scoped_ptr<AppListItem> target_item_ptr =
 153       top_level_item_list_->RemoveItem(target_item_id);
 154   CHECK(target_item_ptr);
 155
 156   // Create a new folder in the same location as the target item.
 157   std::string new_folder_id = AppListFolderItem::GenerateId();
 158   DVLOG(2) << "Creating folder for merge: " << new_folder_id;
 159   scoped_ptr<AppListItem> new_folder_ptr(new AppListFolderItem(
 160       new_folder_id, AppListFolderItem::FOLDER_TYPE_NORMAL));
 161   new_folder_ptr->set_position(target_item_ptr->position());
 162   AppListFolderItem* new_folder = static_cast<AppListFolderItem*>(
 163       AddItemToItemListAndNotify(new_folder_ptr.Pass()));
 164
 165   // Add the items to the new folder.
 166   target_item_ptr->set_position(
 167       new_folder->item_list()->CreatePositionBefore(
 168           syncer::StringOrdinal()));
 169   AddItemToFolderItemAndNotify(new_folder, target_item_ptr.Pass());
 170   source_item_ptr->set_position(
 171       new_folder->item_list()->CreatePositionBefore(
 172           syncer::StringOrdinal()));
 173   AddItemToFolderItemAndNotify(new_folder, source_item_ptr.Pass());
 174
 175   return new_folder->id();
 176 }
 177
 178 void AppListModel::MoveItemToFolder(AppListItem* item,
 179                                     const std::string& folder_id) {
 180   DVLOG(2) << "MoveItemToFolder: " << folder_id
 181            << " <- " << item->ToDebugString();
 182   if (item->folder_id() == folder_id)
 183     return;
 184   AppListFolderItem* dest_folder = FindOrCreateFolderItem(folder_id);
 185   scoped_ptr<AppListItem> item_ptr = RemoveItem(item);
 186   if (dest_folder) {
 187     CHECK(!item->IsInFolder());
 188     AddItemToFolderItemAndNotify(dest_folder, item_ptr.Pass());
 189   } else {
 190     AddItemToItemListAndNotifyUpdate(item_ptr.Pass());
 191   }
 192 }
 193
 194 bool AppListModel::MoveItemToFolderAt(AppListItem* item,
 195                                       const std::string& folder_id,
 196                                       syncer::StringOrdinal position) {
 197   DVLOG(2) << "MoveItemToFolderAt: " << folder_id
 198            << "[" << position.ToDebugString() << "]"
 199            << " <- " << item->ToDebugString();
 200   if (item->folder_id() == folder_id)
 201     return false;
 202   AppListFolderItem* src_folder = FindOrCreateFolderItem(item->folder_id());
 203   if (src_folder &&
 204       src_folder->folder_type() == AppListFolderItem::FOLDER_TYPE_OEM) {
 205     LOG(WARNING) << "MoveItemToFolderAt called with OEM folder as source";
 206     return false;
 207   }
 208   AppListFolderItem* dest_folder = FindOrCreateFolderItem(folder_id);
 209   scoped_ptr<AppListItem> item_ptr = RemoveItem(item);
 210   if (dest_folder) {
 211     item_ptr->set_position(
 212         dest_folder->item_list()->CreatePositionBefore(position));
 213     AddItemToFolderItemAndNotify(dest_folder, item_ptr.Pass());
 214   } else {
 215     item_ptr->set_position(
 216         top_level_item_list_->CreatePositionBefore(position));
 217     AddItemToItemListAndNotifyUpdate(item_ptr.Pass());
 218   }
 219   return true;
 220 }
 221
 222 void AppListModel::SetItemPosition(AppListItem* item,
 223                                    const syncer::StringOrdinal& new_position) {
 224   if (!item->IsInFolder()) {
 225     top_level_item_list_->SetItemPosition(item, new_position);
 226     // Note: this will trigger OnListItemMoved which will signal observers.
 227     // (This is done this way because some View code still moves items within
 228     // the item list directly).
 229     return;
 230   }
 231   AppListFolderItem* folder = FindFolderItem(item->folder_id());
 232   DCHECK(folder);
 233   folder->item_list()->SetItemPosition(item, new_position);
 234   FOR_EACH_OBSERVER(AppListModelObserver,
 235                     observers_,
 236                     OnAppListItemUpdated(item));
 237 }
 238
 239 void AppListModel::SetItemName(AppListItem* item, const std::string& name) {
 240   item->SetName(name);
 241   DVLOG(2) << "AppListModel::SetItemName: " << item->ToDebugString();
 242   FOR_EACH_OBSERVER(AppListModelObserver,
 243                     observers_,
 244                     OnAppListItemUpdated(item));
 245 }
 246
 247 void AppListModel::SetItemNameAndShortName(AppListItem* item,
 248                                            const std::string& name,
 249                                            const std::string& short_name) {
 250   item->SetNameAndShortName(name, short_name);
 251   DVLOG(2) << "AppListModel::SetItemNameAndShortName: "
 252            << item->ToDebugString();
 253   FOR_EACH_OBSERVER(AppListModelObserver,
 254                     observers_,
 255                     OnAppListItemUpdated(item));
 256 }
 257
 258 void AppListModel::DeleteItem(const std::string& id) {
 259   AppListItem* item = FindItem(id);
 260   if (!item)
 261     return;
 262   if (!item->IsInFolder()) {
 263     DCHECK_EQ(0u, item->ChildItemCount())
 264         << "Invalid call to DeleteItem for item with children: " << id;
 265     FOR_EACH_OBSERVER(AppListModelObserver,
 266                       observers_,
 267                       OnAppListItemWillBeDeleted(item));
 268     top_level_item_list_->DeleteItem(id);
 269     FOR_EACH_OBSERVER(AppListModelObserver, observers_, OnAppListItemDeleted());
 270     return;
 271   }
 272   AppListFolderItem* folder = FindFolderItem(item->folder_id());
 273   DCHECK(folder) << "Folder not found for item: " << item->ToDebugString();
 274   scoped_ptr<AppListItem> child_item = RemoveItemFromFolder(folder, item);
 275   DCHECK_EQ(item, child_item.get());
 276   FOR_EACH_OBSERVER(AppListModelObserver,
 277                     observers_,
 278                     OnAppListItemWillBeDeleted(item));
 279   child_item.reset();  // Deletes item.
 280   FOR_EACH_OBSERVER(AppListModelObserver, observers_, OnAppListItemDeleted());
 281 }
 282
 283 void AppListModel::NotifyExtensionPreferenceChanged() {
 284   for (size_t i = 0; i < top_level_item_list_->item_count(); ++i)
 285     top_level_item_list_->item_at(i)->OnExtensionPreferenceChanged();
 286 }
 287
 288 void AppListModel::SetFoldersEnabled(bool folders_enabled) {
 289   folders_enabled_ = folders_enabled;
 290   if (folders_enabled)
 291     return;
 292   // Remove child items from folders.
 293   std::vector<std::string> folder_ids;
 294   for (size_t i = 0; i < top_level_item_list_->item_count(); ++i) {
 295     AppListItem* item = top_level_item_list_->item_at(i);
 296     if (item->GetItemType() != AppListFolderItem::kItemType)
 297       continue;
 298     AppListFolderItem* folder = static_cast<AppListFolderItem*>(item);
 299     if (folder->folder_type() == AppListFolderItem::FOLDER_TYPE_OEM)
 300       continue;  // Do not remove OEM folders.
 301     while (folder->item_list()->item_count()) {
 302       scoped_ptr<AppListItem> child = folder->item_list()->RemoveItemAt(0);
 303       child->set_folder_id("");
 304       AddItemToItemListAndNotifyUpdate(child.Pass());
 305     }
 306     folder_ids.push_back(folder->id());
 307   }
 308   // Delete folders.
 309   for (size_t i = 0; i < folder_ids.size(); ++i)
 310     DeleteItem(folder_ids[i]);
 311 }
 312
 313 void AppListModel::SetCustomLauncherPageEnabled(bool enabled) {
 314   custom_launcher_page_enabled_ = enabled;
 315   FOR_EACH_OBSERVER(AppListModelObserver, observers_,
 316                     OnCustomLauncherPageEnabledStateChanged(enabled));
 317 }
 318
 319 std::vector<SearchResult*> AppListModel::FilterSearchResultsByDisplayType(
 320     SearchResults* results,
 321     SearchResult::DisplayType display_type,
 322     size_t max_results) {
 323   std::vector<SearchResult*> matches;
 324   for (size_t i = 0; i < results->item_count(); ++i) {
 325     SearchResult* item = results->GetItemAt(i);
 326     if (item->display_type() == display_type) {
 327       matches.push_back(item);
 328       if (matches.size() == max_results)
 329         break;
 330     }
 331   }
 332   return matches;
 333 }
 334
 335 void AppListModel::PushCustomLauncherPageSubpage() {
 336   custom_launcher_page_subpage_depth_++;
 337 }
 338
 339 bool AppListModel::PopCustomLauncherPageSubpage() {
 340   if (custom_launcher_page_subpage_depth_ == 0)
 341     return false;
 342
 343   --custom_launcher_page_subpage_depth_;
 344   return true;
 345 }
 346
 347 void AppListModel::ClearCustomLauncherPageSubpages() {
 348   custom_launcher_page_subpage_depth_ = 0;
 349 }
 350
 351 void AppListModel::SetSearchEngineIsGoogle(bool is_google) {
 352   search_engine_is_google_ = is_google;
 353   FOR_EACH_OBSERVER(AppListModelObserver, observers_,
 354                     OnSearchEngineIsGoogleChanged(is_google));
 355 }
 356
 357 // Private methods
 358
 359 void AppListModel::OnListItemMoved(size_t from_index,
 360                                    size_t to_index,
 361                                    AppListItem* item) {
 362   FOR_EACH_OBSERVER(AppListModelObserver,
 363                     observers_,
 364                     OnAppListItemUpdated(item));
 365 }
 366
 367 AppListFolderItem* AppListModel::FindOrCreateFolderItem(
 368     const std::string& folder_id) {
 369   if (folder_id.empty())
 370     return NULL;
 371
 372   AppListFolderItem* dest_folder = FindFolderItem(folder_id);
 373   if (dest_folder)
 374     return dest_folder;
 375
 376   if (!folders_enabled()) {
 377     LOG(ERROR) << "Attempt to create folder item when disabled: " << folder_id;
 378     return NULL;
 379   }
 380
 381   DVLOG(2) << "Creating new folder: " << folder_id;
 382   scoped_ptr<AppListFolderItem> new_folder(
 383       new AppListFolderItem(folder_id, AppListFolderItem::FOLDER_TYPE_NORMAL));
 384   new_folder->set_position(
 385       top_level_item_list_->CreatePositionBefore(syncer::StringOrdinal()));
 386   AppListItem* new_folder_item = AddItemToItemListAndNotify(new_folder.Pass());
 387   return static_cast<AppListFolderItem*>(new_folder_item);
 388 }
 389
 390 AppListItem* AppListModel::AddItemToItemListAndNotify(
 391     scoped_ptr<AppListItem> item_ptr) {
 392   DCHECK(!item_ptr->IsInFolder());
 393   AppListItem* item = top_level_item_list_->AddItem(item_ptr.Pass());
 394   FOR_EACH_OBSERVER(AppListModelObserver,
 395                     observers_,
 396                     OnAppListItemAdded(item));
 397   return item;
 398 }
 399
 400 AppListItem* AppListModel::AddItemToItemListAndNotifyUpdate(
 401     scoped_ptr<AppListItem> item_ptr) {
 402   DCHECK(!item_ptr->IsInFolder());
 403   AppListItem* item = top_level_item_list_->AddItem(item_ptr.Pass());
 404   FOR_EACH_OBSERVER(AppListModelObserver,
 405                     observers_,
 406                     OnAppListItemUpdated(item));
 407   return item;
 408 }
 409
 410 AppListItem* AppListModel::AddItemToFolderItemAndNotify(
 411     AppListFolderItem* folder,
 412     scoped_ptr<AppListItem> item_ptr) {
 413   CHECK_NE(folder->id(), item_ptr->folder_id());
 414   AppListItem* item = folder->item_list()->AddItem(item_ptr.Pass());
 415   item->set_folder_id(folder->id());
 416   FOR_EACH_OBSERVER(AppListModelObserver,
 417                     observers_,
 418                     OnAppListItemUpdated(item));
 419   return item;
 420 }
 421
 422 scoped_ptr<AppListItem> AppListModel::RemoveItem(AppListItem* item) {
 423   if (!item->IsInFolder())
 424     return top_level_item_list_->RemoveItem(item->id());
 425
 426   AppListFolderItem* folder = FindFolderItem(item->folder_id());
 427   return RemoveItemFromFolder(folder, item);
 428 }
 429
 430 scoped_ptr<AppListItem> AppListModel::RemoveItemFromFolder(
 431     AppListFolderItem* folder,
 432     AppListItem* item) {
 433   std::string folder_id = folder->id();
 434   CHECK_EQ(item->folder_id(), folder_id);
 435   scoped_ptr<AppListItem> result = folder->item_list()->RemoveItem(item->id());
 436   result->set_folder_id("");
 437   if (folder->item_list()->item_count() == 0) {
 438     DVLOG(2) << "Deleting empty folder: " << folder->ToDebugString();
 439     DeleteItem(folder_id);
 440   }
 441   return result.Pass();
 442 }
 443
 444 }  // namespace app_list