MacViews: Harmony for toolbar actions bubbles.

chrome/browser/ui/cocoa/extensions/toolbar_actions_bar_bubble_views_presenter.h

+// Copyright 2017 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_COCOA_EXTENSIONS_TOOLBAR_ACTIONS_BAR_BUBBLE_VIEWS_PRESENTER_H_
+#define CHROME_BROWSER_UI_COCOA_EXTENSIONS_TOOLBAR_ACTIONS_BAR_BUBBLE_VIEWS_PRESENTER_H_
+
+#import <Foundation/Foundation.h>
+
+#include <memory>
+
+#include "base/macros.h"
+#include "ui/views/widget/widget_observer.h"
+
+@class NSWindow;
+
+namespace test {
+class ToolbarActionsBarBubbleViewsPresenterTestApi;
+}
+
+@class BrowserActionsController;
+class ToolbarActionsBarBubbleDelegate;
+class ToolbarActionsBarBubbleViews;
+
+// Helper class for showing a toolkit-views toolbar action bubble on a Cocoa
+// browser.
+class ToolbarActionsBarBubbleViewsPresenter : public views::WidgetObserver {
+ public:
+  explicit ToolbarActionsBarBubbleViewsPresenter(
+      BrowserActionsController* owner);
+  ~ToolbarActionsBarBubbleViewsPresenter() override;
+
+  // Presents |bubble| attached to the provided browser window.
+  void PresentAt(std::unique_ptr<ToolbarActionsBarBubbleDelegate> bubble,
+                 NSWindow* parent_window,
+                 NSPoint point_in_screen,
+                 bool anchored_to_action_view);

[Elly Fong-Jones, 2017/03/08 16:33:44]

what is an action view in this context?

[tapted, 2017/03/09 10:24:16]

Updated comment:

  // Presents |bubble| attached to the provided browser |parent_window| at
  // |point_in_screen|. |anchored_to_action_view| indicates that the anchor is
  // a specific browser action view, rather than something more general.

+
+ private:
+  friend class test::ToolbarActionsBarBubbleViewsPresenterTestApi;
+
+  // WidgetObserver:
+  void OnWidgetClosing(views::Widget* widget) override;
+  void OnWidgetDestroying(views::Widget* widget) override;
+
+  BrowserActionsController* owner_;

[Elly Fong-Jones, 2017/03/08 16:33:45]

who owns these? the views hierarchy?

[tapted, 2017/03/09 10:24:16]

Added comments:

  BrowserActionsController* owner_;  // Weak. Owns |this|.

  // Weak. Owns by its Widget (observed by |this|).
  ToolbarActionsBarBubbleViews* active_bubble_;

The BrowserActionsController is actually owned by the toolbar or the app menu
(they both have one) -- NSViewControllers.

ToolbarActionsBarBubbleViews is a WidgetDelegate, so it drives its own lifetime.

+  ToolbarActionsBarBubbleViews* active_bubble_;
+
+  DISALLOW_COPY_AND_ASSIGN(ToolbarActionsBarBubbleViewsPresenter);
+};
+
+#endif  // CHROME_BROWSER_UI_COCOA_EXTENSIONS_TOOLBAR_ACTIONS_BAR_BUBBLE_VIEWS_PRESENTER_H_