Handle gesture events in notifications.

ash/system/tray/tray_notification_view.h

Index: ash/system/tray/tray_notification_view.h
diff --git a/ash/system/tray/tray_notification_view.h b/ash/system/tray/tray_notification_view.h
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+// 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.
+
+#ifndef ASH_SYSTEM_TRAY_TRAY_NOTIFICATION_VIEW_H_
+#define ASH_SYSTEM_TRAY_TRAY_NOTIFICATION_VIEWS_H_
+#pragma once
+
+#include "ui/views/controls/button/image_button.h"
+#include "ui/views/view.h"
+
+namespace gfx {
+class ImageSkia;
+}
+
+namespace views {
+class ImageView;
+}
+
+namespace ash {
+
+class SystemTrayItem;
+
+namespace internal {
+
+// A view for closable notification views, laid out like:
+//  -------------------
+// | icon  contents  x |
+//  ----------------v--
+// The close button will call OnClose() when clicked.
+class TrayNotificationView : public views::View,
+                             public views::ButtonListener {
+ public:
+  // If icon_id is 0, no icon image will be set. SetIconImage can be called
+  // to later set the icon image.
+  TrayNotificationView(SystemTrayItem* tray, int icon_id);
+  virtual ~TrayNotificationView();
+
+  // InitView must be called once with the contents to be displayed.
+  void InitView(views::View* contents);
+
+  // Sets/updates the icon image.
+  void SetIconImage(const gfx::ImageSkia& image);
+
+  // Replaces the contents view.
+  void UpdateView(views::View* new_contents);
+
+  // Replaces the contents view and updates the icon image.
+  void UpdateViewAndImage(views::View* new_contents,
+                          const gfx::ImageSkia& image);
+
+  // Overridden from ButtonListener.
+  virtual void ButtonPressed(views::Button* sender,
+                             const views::Event& event) OVERRIDE;
+
+  // Overridden from views::View.
+  virtual bool OnMousePressed(const views::MouseEvent& event) OVERRIDE;
+  virtual ui::GestureStatus OnGestureEvent(
+      const views::GestureEvent& event) OVERRIDE;
+
+ protected:
+  // Called when the close button is pressed. Does nothing by default.
+  virtual void OnClose();
+  // Called when the notification is clicked on. Does nothing by default.
+  virtual void OnClickAction();
+
+  SystemTrayItem* tray() { return tray_; }
+
+ private:
+  void HandleClose();
+  void HandleClickAction();
+
+  SystemTrayItem* tray_;
+  int icon_id_;
+  views::ImageView* icon_;
+
+  DISALLOW_COPY_AND_ASSIGN(TrayNotificationView);
+};
+
+}  // namespace internal
+}  // namespace ash
+
+#endif  // ASH_SYSTEM_TRAY_TRAY_NOTIFICATION_VIEWS_H_