Reland r105450: Linux: add basic bookmark menu support. More features can be added later.

chrome/browser/ui/gtk/bookmark_sub_menu_model_gtk.h

Index: chrome/browser/ui/gtk/bookmark_sub_menu_model_gtk.h
===================================================================
--- chrome/browser/ui/gtk/bookmark_sub_menu_model_gtk.h	(revision 105454)
+++ chrome/browser/ui/gtk/bookmark_sub_menu_model_gtk.h	(working copy)
@@ -0,0 +1,112 @@
+// 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.
+
+#ifndef CHROME_BROWSER_UI_GTK_BOOKMARK_SUB_MENU_MODEL_GTK_H_
+#define CHROME_BROWSER_UI_GTK_BOOKMARK_SUB_MENU_MODEL_GTK_H_
+#pragma once
+
+#include <vector>
+
+#include "chrome/browser/bookmarks/base_bookmark_model_observer.h"
+#include "ui/base/models/simple_menu_model.h"
+#include "webkit/glue/window_open_disposition.h"
+
+class Browser;
+class BookmarkModel;
+class BookmarkNode;
+class MenuGtk;  // See below for why we need this.
+class PageNavigator;
+
+// BookmarkNodeMenuModel builds a SimpleMenuModel on demand when the menu is
+// shown, and automatically destroys child models when the menu is closed.
+class BookmarkNodeMenuModel : public ui::SimpleMenuModel {
+ public:
+  BookmarkNodeMenuModel(ui::SimpleMenuModel::Delegate* delegate,
+                        BookmarkModel* model,
+                        const BookmarkNode* node,
+                        PageNavigator* page_navigator);
+  virtual ~BookmarkNodeMenuModel();
+
+  // From SimpleMenuModel. Takes care of deleting submenus.
+  // Note that this is not virtual. That's OK for our use.
+  void Clear();
+
+  // From MenuModel via SimpleMenuModel.
+  virtual void MenuWillShow() OVERRIDE;
+  virtual void MenuClosed() OVERRIDE;
+  virtual void ActivatedAt(int index) OVERRIDE;
+  virtual void ActivatedAt(int index, int event_flags) OVERRIDE;
+
+ protected:
+  // Adds all bookmark items to the model. Does not clear the model first.
+  void PopulateMenu();
+
+  BookmarkModel* model() const { return model_; }
+  void set_model(BookmarkModel* model) { model_ = model; }
+
+  const BookmarkNode* node() const { return node_; }
+  void set_node(const BookmarkNode* node) { node_ = node; }
+
+ private:
+  // Uses the page navigator to open the bookmark at the given index.
+  void NavigateToMenuItem(int index, WindowOpenDisposition disposition);
+
+  // The bookmark model whose bookmarks we will show. Note that in the top-level
+  // bookmark menu, this may be null. (It is set only when the menu is shown.)
+  BookmarkModel* model_;
+
+  // The bookmark node for the folder that this model will show. Note that in
+  // the top-level bookmark menu, this may be null, as above.
+  const BookmarkNode* node_;
+
+  // The page navigator used to open bookmarks in ActivatedAt().
+  PageNavigator* page_navigator_;
+
+  // A list of the submenus we own and will need to delete.
+  std::vector<BookmarkNodeMenuModel*> submenus_;
+
+  DISALLOW_COPY_AND_ASSIGN(BookmarkNodeMenuModel);
+};
+
+// This is the top-level bookmark menu model. It handles prepending a few fixed
+// items before the bookmarks. Child menus are all plain BookmarkNodeMenuModels.
+// This class also handles watching the bookmark model and forcing the menu to
+// close if it changes while the menu is open.
+class BookmarkSubMenuModel : public BookmarkNodeMenuModel,
+                             public BaseBookmarkModelObserver {
+ public:
+  BookmarkSubMenuModel(ui::SimpleMenuModel::Delegate* delegate,
+                       Browser* browser);
+
+  virtual ~BookmarkSubMenuModel();
+
+  // See below; this is used to allow closing the menu when bookmarks change.
+  void SetMenuGtk(MenuGtk* menu) { menu_ = menu; }
+
+  // From BaseBookmarkModelObserver.
+  virtual void BookmarkModelChanged() OVERRIDE;
+  virtual void BookmarkModelBeingDeleted(BookmarkModel* model) OVERRIDE;
+
+  // From MenuModel via BookmarkNodeMenuModel, SimpleMenuModel.
+  virtual void MenuWillShow() OVERRIDE;
+  virtual void ActivatedAt(int index) OVERRIDE;
+  virtual void ActivatedAt(int index, int event_flags) OVERRIDE;
+  virtual bool IsEnabledAt(int index) const OVERRIDE;
+  virtual bool IsVisibleAt(int index) const OVERRIDE;
+
+ private:
+  Browser* browser_;
+
+  // The number of fixed items shown before the bookmarks.
+  int fixed_items_;
+
+  // We need to be able to call Cancel() on the menu when bookmarks change. This
+  // is a bit of an abstraction violation but it could be converted to an
+  // interface with just a Cancel() method if necessary.
+  MenuGtk* menu_;
+
+  DISALLOW_COPY_AND_ASSIGN(BookmarkSubMenuModel);
+};
+
+#endif  // CHROME_BROWSER_UI_GTK_BOOKMARK_SUB_MENU_MODEL_GTK_H_