Give platform apps control over launcher right-click context menu.

chrome/browser/extensions/context_menu_matcher.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 "base/utf_string_conversions.h"
+#include "chrome/app/chrome_command_ids.h"
+#include "chrome/browser/extensions/context_menu_matcher.h"
+#include "chrome/browser/extensions/extension_service.h"
+#include "chrome/browser/profiles/profile.h"
+#include "content/public/common/context_menu_params.h"
+#include "ui/gfx/favicon_size.h"
+
+namespace extensions {
+
+// static
+const size_t ContextMenuMatcher::kMaxExtensionItemTitleLength = 75;
+
+ContextMenuMatcher::ContextMenuMatcher(
+    Profile* profile,
+    ui::SimpleMenuModel::Delegate* delegate,
+    ui::SimpleMenuModel* menu_model,
+    const base::Callback<bool(const MenuItem*)>& filter)
+    : profile_(profile), menu_model_(menu_model), delegate_(delegate),
+      filter_(filter) {
+}
+
+void ContextMenuMatcher::AppendExtensionItems(const std::string& extension_id,
+                                              const string16& selection_text,
+                                              int* index)
+{
+  ExtensionService* service = profile_->GetExtensionService();
+  MenuManager* manager = service->menu_manager();
+  const Extension* extension = service->GetExtensionById(extension_id, false);
+  DCHECK_GE(*index, 0);
+  int max_index =
+      IDC_EXTENSIONS_CONTEXT_CUSTOM_LAST - IDC_EXTENSIONS_CONTEXT_CUSTOM_FIRST;
+  if (!extension || *index >= max_index)
+    return;
+
+  // Find matching items.
+  const MenuItem::List* all_items = manager->MenuItems(extension_id);
+  if (!all_items || all_items->empty())
+    return;
+  bool can_cross_incognito = service->CanCrossIncognito(extension);
+  MenuItem::List items = GetRelevantExtensionItems(*all_items,
+                                                   can_cross_incognito);
+
+  if (items.empty())
+    return;
+
+  // If this is the first extension-provided menu item, and there are other
+  // items in the menu, and the last item is not a separator add a separator.
+  if (*index == 0 && menu_model_->GetItemCount() &&
+      menu_model_->GetTypeAt(menu_model_->GetItemCount() - 1) !=
+          ui::MenuModel::TYPE_SEPARATOR)
+    menu_model_->AddSeparator(ui::NORMAL_SEPARATOR);
+
+  // Extensions (other than platform apps) are only allowed one top-level slot
+  // (and it can't be a radio or checkbox item because we are going to put the
+  // extension icon next to it).
+  // If they have more than that, we automatically push them into a submenu.
+  if (extension->is_platform_app()) {
+    RecursivelyAppendExtensionItems(items, can_cross_incognito, selection_text,
+                                    menu_model_, index);
+  } else {
+    int menu_id = IDC_EXTENSIONS_CONTEXT_CUSTOM_FIRST + (*index)++;
+    string16 title;
+    MenuItem::List submenu_items;
+
+    if (items.size() > 1 || items[0]->type() != MenuItem::NORMAL) {
+      title = UTF8ToUTF16(extension->name());
+      submenu_items = items;
+    } else {
+      MenuItem* item = items[0];
+      extension_item_map_[menu_id] = item->id();
+      title = item->TitleWithReplacement(selection_text,
+                                       kMaxExtensionItemTitleLength);
+      submenu_items = GetRelevantExtensionItems(item->children(),
+                                                can_cross_incognito);
+    }
+
+    // Now add our item(s) to the menu_model_.
+    if (submenu_items.empty()) {
+      menu_model_->AddItem(menu_id, title);
+    } else {
+      ui::SimpleMenuModel* submenu = new ui::SimpleMenuModel(delegate_);
+      extension_menu_models_.push_back(submenu);
+      menu_model_->AddSubMenu(menu_id, title, submenu);
+      RecursivelyAppendExtensionItems(submenu_items, can_cross_incognito,
+                                      selection_text, submenu, index);
+    }
+    SetExtensionIcon(extension_id);
+  }
+}
+
+void ContextMenuMatcher::Clear() {
+  extension_item_map_.clear();
+  extension_menu_models_.clear();
+}
+
+bool ContextMenuMatcher::IsCommandIdChecked(int command_id) const {
+  MenuItem* item = GetExtensionMenuItem(command_id);
+  if (!item)
+    return false;
+  return item->checked();
+}
+
+bool ContextMenuMatcher::IsCommandIdEnabled(int command_id) const {
+  MenuItem* item = GetExtensionMenuItem(command_id);
+  if (!item)
+    return true;
+  return item->enabled();
+}
+
+void ContextMenuMatcher::ExecuteCommand(int command_id,
+    const content::ContextMenuParams& params) {
+  MenuManager* manager = profile_->GetExtensionService()->menu_manager();
+  MenuItem* item = GetExtensionMenuItem(command_id);
+  if (!item)
+    return;
+
+  manager->ExecuteCommand(profile_, NULL, params, item->id());
+}
+
+MenuItem::List ContextMenuMatcher::GetRelevantExtensionItems(
+    const MenuItem::List& items,
+    bool can_cross_incognito) {
+  MenuItem::List result;
+  for (MenuItem::List::const_iterator i = items.begin();
+       i != items.end(); ++i) {
+    const MenuItem* item = *i;
+
+    if (!filter_.Run(item))
+      continue;
+
+    if (item->id().incognito == profile_->IsOffTheRecord() ||
+        can_cross_incognito)
+      result.push_back(*i);
+  }
+  return result;
+}
+
+void ContextMenuMatcher::RecursivelyAppendExtensionItems(
+    const MenuItem::List& items,
+    bool can_cross_incognito,
+    const string16& selection_text,
+    ui::SimpleMenuModel* menu_model,
+    int* index)
+{
+  MenuItem::Type last_type = MenuItem::NORMAL;
+  int radio_group_id = 1;
+
+  for (MenuItem::List::const_iterator i = items.begin();
+       i != items.end(); ++i) {
+    MenuItem* item = *i;
+
+    // If last item was of type radio but the current one isn't, auto-insert
+    // a separator.  The converse case is handled below.
+    if (last_type == MenuItem::RADIO &&
+        item->type() != MenuItem::RADIO) {
+      menu_model->AddSeparator(ui::NORMAL_SEPARATOR);
+      last_type = MenuItem::SEPARATOR;
+    }
+
+    int menu_id = IDC_EXTENSIONS_CONTEXT_CUSTOM_FIRST + (*index)++;
+    if (menu_id >= IDC_EXTENSIONS_CONTEXT_CUSTOM_LAST)
+      return;
+    extension_item_map_[menu_id] = item->id();
+    string16 title = item->TitleWithReplacement(selection_text,
+                                                kMaxExtensionItemTitleLength);
+    if (item->type() == MenuItem::NORMAL) {
+      MenuItem::List children =
+          GetRelevantExtensionItems(item->children(), can_cross_incognito);
+      if (children.empty()) {
+        menu_model->AddItem(menu_id, title);
+      } else {
+        ui::SimpleMenuModel* submenu = new ui::SimpleMenuModel(delegate_);
+        extension_menu_models_.push_back(submenu);
+        menu_model->AddSubMenu(menu_id, title, submenu);
+        RecursivelyAppendExtensionItems(children, can_cross_incognito,
+                                        selection_text, submenu, index);
+      }
+    } else if (item->type() == MenuItem::CHECKBOX) {
+      menu_model->AddCheckItem(menu_id, title);
+    } else if (item->type() == MenuItem::RADIO) {
+      if (i != items.begin() &&
+          last_type != MenuItem::RADIO) {
+        radio_group_id++;
+
+        // Auto-append a separator if needed.
+        if (last_type != MenuItem::SEPARATOR)
+          menu_model->AddSeparator(ui::NORMAL_SEPARATOR);
+      }
+
+      menu_model->AddRadioItem(menu_id, title, radio_group_id);
+    } else if (item->type() == MenuItem::SEPARATOR) {
+      if (i != items.begin() && last_type != MenuItem::SEPARATOR) {
+        menu_model->AddSeparator(ui::NORMAL_SEPARATOR);
+      }
+    }
+    last_type = item->type();
+  }
+}
+
+MenuItem* ContextMenuMatcher::GetExtensionMenuItem(int id) const {
+  MenuManager* manager = profile_->GetExtensionService()->menu_manager();
+  std::map<int, MenuItem::Id>::const_iterator i =
+      extension_item_map_.find(id);
+  if (i != extension_item_map_.end()) {
+    MenuItem* item = manager->GetItemById(i->second);
+    if (item)
+      return item;
+  }
+  return NULL;
+}
+
+void ContextMenuMatcher::SetExtensionIcon(const std::string& extension_id) {
+  ExtensionService* service = profile_->GetExtensionService();
+  MenuManager* menu_manager = service->menu_manager();
+
+  int index = menu_model_->GetItemCount() - 1;
+  DCHECK_GE(index, 0);
+
+  const SkBitmap& icon = menu_manager->GetIconForExtension(extension_id);
+  DCHECK(icon.width() == gfx::kFaviconSize);
+  DCHECK(icon.height() == gfx::kFaviconSize);
+
+  menu_model_->SetIcon(index, gfx::Image(icon));
+}
+
+}  // namespace extensions