GTK: Add Recently Closed tabs to the History menu in the global menu bar.

chrome/browser/ui/gtk/global_history_menu.cc

Index: chrome/browser/ui/gtk/global_history_menu.cc
diff --git a/chrome/browser/ui/gtk/global_history_menu.cc b/chrome/browser/ui/gtk/global_history_menu.cc
new file mode 100644
index 0000000000000000000000000000000000000000..83c861c3d3cffaa69083d6032abd10e23b405def
--- /dev/null
+++ b/chrome/browser/ui/gtk/global_history_menu.cc
@@ -0,0 +1,462 @@
+// Copyright (c) 2011 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/gtk/global_history_menu.h"
+
+#include <gtk/gtk.h>
+
+#include "base/stl_util-inl.h"
+#include "base/utf_string_conversions.h"
+#include "base/string_number_conversions.h"
+#include "chrome/browser/favicon_service.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/ui/browser.h"
+#include "chrome/browser/ui/browser_tab_restore_service_delegate.h"
+#include "chrome/browser/ui/gtk/global_menu_bar.h"
+#include "chrome/browser/ui/gtk/gtk_theme_service.h"
+#include "chrome/browser/ui/gtk/gtk_util.h"
+#include "chrome/browser/ui/gtk/owned_widget_gtk.h"
+#include "chrome/common/url_constants.h"
+#include "content/common/notification_service.h"
+#include "grit/generated_resources.h"
+#include "ui/base/l10n/l10n_util.h"
+#include "ui/base/text/text_elider.h"
+#include "ui/gfx/codec/png_codec.h"
+#include "ui/gfx/gtk_util.h"
+
+namespace {
+
+// The number of recently closed items to get.
+const unsigned int kRecentlyClosedCount = 10;
+
+// Menus more than this many chars long will get trimmed.
+const int kMaximumMenuWidthInChars = 50;
+
+}  // namespace
+
+struct GlobalHistoryMenu::ClearMenuClosure {
+  GtkWidget* container;
+  GlobalHistoryMenu* menu_bar;
+  int tag;
+};
+
+struct GlobalHistoryMenu::GetIndexClosure {
+  bool found;
+  int current_index;
+  int tag;
+};
+
+class GlobalHistoryMenu::HistoryItem {
+ public:
+  HistoryItem()
+      : icon_requested(false),
+        menu_item(NULL),
+        session_id(0) {}
+
+  // The title for the menu item.
+  string16 title;
+  // The URL that will be navigated to if the user selects this item.
+  GURL url;
+
+  // If the icon is being requested from the FaviconService, |icon_requested|
+  // will be true and |icon_handle| will be non-NULL. If this is false, then
+  // |icon_handle| will be NULL.
+  bool icon_requested;
+  // The Handle given to us by the FaviconService for the icon fetch request.
+  FaviconService::Handle icon_handle;
+
+  // The icon as a GtkImage for inclusion in a GtkImageMenuItem.
+  OwnedWidgetGtk icon_image;
+
+  // A pointer to the menu_item. This is a weak reference in the GTK+ version
+  // because the GtkMenu must sink the reference.
+  GtkWidget* menu_item;
+
+  // This ID is unique for a browser session and can be passed to the
+  // TabRestoreService to re-open the closed window or tab that this
+  // references. A non-0 session ID indicates that this is an entry can be
+  // restored that way. Otherwise, the URL will be used to open the item and
+  // this ID will be 0.
+  SessionID::id_type session_id;
+
+  // If the HistoryItem is a window, this will be the vector of tabs. Note
+  // that this is a list of weak references. The |menu_item_map_| is the owner
+  // of all items. If it is not a window, then the entry is a single page and
+  // the vector will be empty.
+  std::vector<HistoryItem*> tabs;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(HistoryItem);
+};
+
+GlobalHistoryMenu::GlobalHistoryMenu(Browser* browser)
+    : browser_(browser),
+      profile_(browser_->profile()),
+      default_favicon_(NULL),
+      tab_restore_service_(NULL) {
+}
+
+GlobalHistoryMenu::~GlobalHistoryMenu() {
+  if (tab_restore_service_)
+    tab_restore_service_->RemoveObserver(this);
+
+  STLDeleteContainerPairSecondPointers(menu_item_history_map_.begin(),
+                                       menu_item_history_map_.end());
+  menu_item_history_map_.clear();
+}
+
+void GlobalHistoryMenu::Init(GtkWidget* history_menu) {
+  history_menu_ = history_menu;
+
+  default_favicon_ = GtkThemeService::GetDefaultFavicon(true);
+
+  if (profile_) {
+    tab_restore_service_ = profile_->GetTabRestoreService();
+    if (tab_restore_service_) {
+      tab_restore_service_->LoadTabsFromLastSession();
+      tab_restore_service_->AddObserver(this);
+
+      // If LoadTabsFromLastSession doesn't load tabs, it won't call
+      // TabRestoreServiceChanged(). This ensures that all new windows after
+      // the first one will have their menus populated correctly.
+      TabRestoreServiceChanged(tab_restore_service_);
+    }
+
+    registrar_.Add(this, NotificationType::BROWSER_THEME_CHANGED,
+                   Source<Profile>(profile_));
+  }
+}
+
+GlobalHistoryMenu::HistoryItem* GlobalHistoryMenu::HistoryItemForMenuItem(
+    GtkWidget* menu_item) {
+  MenuItemToHistoryMap::iterator it = menu_item_history_map_.find(menu_item);
+  return it != menu_item_history_map_.end() ? it->second : NULL;
+}
+
+bool GlobalHistoryMenu::HasValidHistoryItemForTab(
+    const TabRestoreService::Tab& entry) {
+  if (entry.navigations.empty())
+    return false;
+
+  const TabNavigation& current_navigation =
+      entry.navigations.at(entry.current_navigation_index);
+  if (current_navigation.virtual_url() == GURL(chrome::kChromeUINewTabURL))
+    return false;
+
+  return true;
+}
+
+GlobalHistoryMenu::HistoryItem* GlobalHistoryMenu::HistoryItemForTab(
+    const TabRestoreService::Tab& entry) {
+  if (!HasValidHistoryItemForTab(entry))
+    return NULL;
+
+  const TabNavigation& current_navigation =
+      entry.navigations.at(entry.current_navigation_index);
+  HistoryItem* item = new HistoryItem();
+  item->title = current_navigation.title();
+  item->url = current_navigation.virtual_url();
+  item->session_id = entry.id;
+
+  // Tab navigations don't come with icons, so we always have to request them.
+  GetFaviconForHistoryItem(item);
+
+  return item;
+}
+
+GtkWidget* GlobalHistoryMenu::AddHistoryItemToMenu(HistoryItem* item,
+                                                   GtkWidget* menu,
+                                                   int tag,
+                                                   int index) {
+  string16 title = item->title;
+  std::string url_string = item->url.possibly_invalid_spec();
+
+  if (title.empty())
+    title = UTF8ToUTF16(url_string);
+  ui::ElideString(title, kMaximumMenuWidthInChars, &title);
+
+  GtkWidget* menu_item = gtk_image_menu_item_new_with_label(
+      UTF16ToUTF8(title).c_str());
+  gtk_util::SetAlwaysShowImage(menu_item);
+
+  item->menu_item = menu_item;
+  gtk_widget_show(menu_item);
+  g_object_set_data(G_OBJECT(menu_item), "type-tag", GINT_TO_POINTER(tag));
+  g_signal_connect(menu_item, "activate",
+                   G_CALLBACK(OnRecentlyClosedItemActivatedThunk), this);
+  if (item->icon_image.get()) {
+    gtk_image_menu_item_set_image(GTK_IMAGE_MENU_ITEM(menu_item),
+                                  item->icon_image.get());
+  } else if (!item->tabs.size()) {
+    gtk_image_menu_item_set_image(GTK_IMAGE_MENU_ITEM(menu_item),
+                                  gtk_image_new_from_pixbuf(default_favicon_));
+  }
+
+  std::string tooltip = gtk_util::BuildTooltipTitleFor(item->title, item->url);
+  gtk_widget_set_tooltip_markup(menu_item, tooltip.c_str());
+
+  menu_item_history_map_.insert(std::make_pair(menu_item, item));
+  gtk_menu_shell_insert(GTK_MENU_SHELL(menu), menu_item, index);
+
+  return menu_item;
+}
+
+void GlobalHistoryMenu::GetFaviconForHistoryItem(HistoryItem* item) {
+  FaviconService* service =
+      profile_->GetFaviconService(Profile::EXPLICIT_ACCESS);
+  FaviconService::Handle handle = service->GetFaviconForURL(
+      item->url,
+      history::FAVICON,
+      &favicon_consumer_,
+      NewCallback(this, &GlobalHistoryMenu::GotFaviconData));
+  favicon_consumer_.SetClientData(service, handle, item);
+  item->icon_handle = handle;
+  item->icon_requested = true;
+}
+
+void GlobalHistoryMenu::GotFaviconData(FaviconService::Handle handle,
+                                       history::FaviconData favicon) {
+  HistoryItem* item =
+      favicon_consumer_.GetClientData(
+          profile_->GetFaviconService(Profile::EXPLICIT_ACCESS), handle);
+  DCHECK(item);
+  item->icon_requested = false;
+  item->icon_handle = NULL;
+
+  SkBitmap icon;
+  if (favicon.is_valid() &&
+      gfx::PNGCodec::Decode(favicon.image_data->front(),
+                            favicon.image_data->size(), &icon)) {
+    GdkPixbuf* pixbuf = gfx::GdkPixbufFromSkBitmap(&icon);
+    if (pixbuf) {
+      item->icon_image.Own(gtk_image_new_from_pixbuf(pixbuf));
+      g_object_unref(pixbuf);
+
+      if (item->menu_item) {
+        gtk_image_menu_item_set_image(
+            GTK_IMAGE_MENU_ITEM(item->menu_item),
+            item->icon_image.get());
+      }
+    }
+  }
+}
+
+void GlobalHistoryMenu::CancelFaviconRequest(HistoryItem* item) {
+  DCHECK(item);
+  if (item->icon_requested) {
+    FaviconService* service =
+        profile_->GetFaviconService(Profile::EXPLICIT_ACCESS);
+    service->CancelRequest(item->icon_handle);
+    item->icon_requested = false;
+    item->icon_handle = NULL;
+  }
+}
+
+int GlobalHistoryMenu::GetIndexOfMenuItemWithTag(GtkWidget* menu, int tag_id) {
+  GetIndexClosure closure;
+  closure.found = false;
+  closure.current_index = 0;
+  closure.tag = tag_id;
+
+  gtk_container_foreach(
+      GTK_CONTAINER(menu),
+      reinterpret_cast<void (*)(GtkWidget*, void*)>(GetIndexCallback),
+      &closure);
+
+  return closure.current_index;
+}
+
+void GlobalHistoryMenu::ClearMenuSection(GtkWidget* menu, int tag) {
+  ClearMenuClosure closure;
+  closure.container = menu;
+  closure.menu_bar = this;
+  closure.tag = tag;
+
+  gtk_container_foreach(
+      GTK_CONTAINER(menu),
+      reinterpret_cast<void (*)(GtkWidget*, void*)>(ClearMenuCallback),
+      &closure);
+}
+
+// static
+void GlobalHistoryMenu::GetIndexCallback(GtkWidget* menu_item,
+                                         GetIndexClosure* closure) {
+  int tag = GPOINTER_TO_INT(g_object_get_data(G_OBJECT(menu_item), "type-tag"));
+  if (tag == closure->tag)
+    closure->found = true;
+
+  if (!closure->found)
+    closure->current_index++;
+}
+
+// static
+void GlobalHistoryMenu::ClearMenuCallback(GtkWidget* menu_item,
+                                          ClearMenuClosure* closure) {
+  DCHECK_NE(closure->tag, 0);
+
+  int tag = GPOINTER_TO_INT(g_object_get_data(G_OBJECT(menu_item), "type-tag"));
+  if (closure->tag == tag) {
+    HistoryItem* item = closure->menu_bar->HistoryItemForMenuItem(menu_item);
+
+    if (item) {
+      closure->menu_bar->CancelFaviconRequest(item);
+      closure->menu_bar->menu_item_history_map_.erase(menu_item);
+      delete item;
+    }
+
+    GtkWidget* submenu = gtk_menu_item_get_submenu(GTK_MENU_ITEM(menu_item));
+    if (submenu)
+      closure->menu_bar->ClearMenuSection(submenu, closure->tag);
+
+    gtk_container_remove(GTK_CONTAINER(closure->container), menu_item);
+  }
+}
+
+void GlobalHistoryMenu::Observe(NotificationType type,
+                                const NotificationSource& source,
+                                const NotificationDetails& details) {
+  DCHECK(type.value == NotificationType::BROWSER_THEME_CHANGED);
+
+  // Keeping track of which menu items have the default icon is going an
+  // error-prone pain, so instead just store the new default favicon and
+  // we'll update on the next menu change event.
+  default_favicon_ = GtkThemeService::GetDefaultFavicon(true);
+}
+
+void GlobalHistoryMenu::TabRestoreServiceChanged(TabRestoreService* service) {
+  const TabRestoreService::Entries& entries = service->entries();
+
+  ClearMenuSection(history_menu_, GlobalMenuBar::TAG_RECENTLY_CLOSED);
+
+  // We'll get the index the "Recently Closed" header. (This can vary depending
+  // on the number of "Most Visited" items.
+  int index = GetIndexOfMenuItemWithTag(
+      history_menu_,
+      GlobalMenuBar::TAG_RECENTLY_CLOSED_HEADER) + 1;
+
+  unsigned int added_count = 0;
+  for (TabRestoreService::Entries::const_iterator it = entries.begin();
+       it != entries.end() && added_count < kRecentlyClosedCount; ++it) {
+    TabRestoreService::Entry* entry = *it;
+
+    if (entry->type == TabRestoreService::WINDOW) {
+      TabRestoreService::Window* entry_win =
+          static_cast<TabRestoreService::Window*>(entry);
+      std::vector<TabRestoreService::Tab>& tabs = entry_win->tabs;
+      if (tabs.empty())
+        continue;
+
+      // Check that this window has valid content. Sometimes it is possible for
+      // there to not be any subitems for a given window; if that is the case,
+      // do not add the entry to the main menu.
+      int valid_tab_count = 0;
+      std::vector<TabRestoreService::Tab>::const_iterator it;
+      for (it = tabs.begin(); it != tabs.end(); ++it) {
+        if (HasValidHistoryItemForTab(*it))
+          valid_tab_count++;
+      }
+      if (valid_tab_count == 0)
+        continue;
+
+      // Create the item for the parent/window. Do not set the title yet
+      // because the actual number of items that are in the menu will not be
+      // known until things like the NTP are filtered out, which is done when
+      // the tab items are actually created.
+      HistoryItem* item = new HistoryItem();
+      item->session_id = entry_win->id;
+
+      GtkWidget* submenu = gtk_menu_new();
+
+      GtkWidget* restore_item = gtk_menu_item_new_with_label(
+          l10n_util::GetStringUTF8(
+              IDS_HISTORY_CLOSED_RESTORE_WINDOW_LINUX).c_str());
+      g_object_set_data(G_OBJECT(restore_item), "type-tag",
+                        GINT_TO_POINTER(GlobalMenuBar::TAG_RECENTLY_CLOSED));
+      g_signal_connect(restore_item, "activate",
+                       G_CALLBACK(OnRecentlyClosedItemActivatedThunk), this);
+      gtk_widget_show(restore_item);
+
+      // The mac version of this code allows the user to click on the parent
+      // menu item to have the same effect as clicking the restore window
+      // submenu item. GTK+ helpfully activates a menu item when it shows a
+      // submenu so toss that feature out.
+      menu_item_history_map_.insert(std::make_pair(restore_item, item));
+      gtk_menu_shell_append(GTK_MENU_SHELL(submenu), restore_item);
+
+      GtkWidget* separator = gtk_separator_menu_item_new();
+      gtk_widget_show(separator);
+      gtk_menu_shell_append(GTK_MENU_SHELL(submenu), separator);
+
+      // Loop over the window's tabs and add them to the submenu.
+      int subindex = 2;
+      for (it = tabs.begin(); it != tabs.end(); ++it) {
+        TabRestoreService::Tab tab = *it;
+        HistoryItem* tab_item = HistoryItemForTab(tab);
+        if (tab_item) {
+          item->tabs.push_back(tab_item);
+          AddHistoryItemToMenu(tab_item,
+                               submenu,
+                               GlobalMenuBar::TAG_RECENTLY_CLOSED,
+                               subindex++);
+        }
+      }
+
+      // Now that the number of tabs that has been added is known, set the
+      // title of the parent menu item.
+      std::string title =
+          (item->tabs.size() == 1) ?
+          l10n_util::GetStringUTF8(
+              IDS_NEW_TAB_RECENTLY_CLOSED_WINDOW_SINGLE) :
+          l10n_util::GetStringFUTF8(
+              IDS_NEW_TAB_RECENTLY_CLOSED_WINDOW_MULTIPLE,
+              base::IntToString16(item->tabs.size()));
+
+      // Create the menu item parent. Unlike mac, it's can't be activated.
+      GtkWidget* parent_item = gtk_image_menu_item_new_with_label(
+          title.c_str());
+      gtk_widget_show(parent_item);
+      g_object_set_data(G_OBJECT(parent_item), "type-tag",
+                        GINT_TO_POINTER(GlobalMenuBar::TAG_RECENTLY_CLOSED));
+      gtk_menu_item_set_submenu(GTK_MENU_ITEM(parent_item), submenu);
+
+      gtk_menu_shell_insert(GTK_MENU_SHELL(history_menu_), parent_item,
+                            index++);
+      ++added_count;
+    } else if (entry->type == TabRestoreService::TAB) {
+      TabRestoreService::Tab* tab =
+          static_cast<TabRestoreService::Tab*>(entry);
+      HistoryItem* item = HistoryItemForTab(*tab);
+      if (item) {
+        AddHistoryItemToMenu(item,
+                             history_menu_,
+                             GlobalMenuBar::TAG_RECENTLY_CLOSED,
+                             index++);
+        ++added_count;
+      }
+    }
+  }
+}
+
+void GlobalHistoryMenu::TabRestoreServiceDestroyed(
+    TabRestoreService* service) {
+  tab_restore_service_ = NULL;
+}
+
+void GlobalHistoryMenu::OnRecentlyClosedItemActivated(GtkWidget* sender) {
+  WindowOpenDisposition disposition =
+      gtk_util::DispositionForCurrentButtonPressEvent();
+  HistoryItem* item = HistoryItemForMenuItem(sender);
+
+  // If this item can be restored using TabRestoreService, do so. Otherwise,
+  // just load the URL.
+  TabRestoreService* service = browser_->profile()->GetTabRestoreService();
+  if (item->session_id && service) {
+    service->RestoreEntryById(browser_->tab_restore_service_delegate(),
+                              item->session_id, false);
+  } else {
+    DCHECK(item->url.is_valid());
+    browser_->OpenURL(item->url, GURL(), disposition,
+                      PageTransition::AUTO_BOOKMARK);
+  }
+}