1 // Copyright 2016 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4 
5 #ifndef CHROME_BROWSER_METRICS_DESKTOP_SESSION_DURATION_DESKTOP_SESSION_DURATION_OBSERVER_H_
6 #define CHROME_BROWSER_METRICS_DESKTOP_SESSION_DURATION_DESKTOP_SESSION_DURATION_OBSERVER_H_
7 
8 #include "base/macros.h"
9 #include "content/public/browser/render_widget_host.h"
10 #include "content/public/browser/web_contents.h"
11 #include "content/public/browser/web_contents_observer.h"
12 #include "content/public/browser/web_contents_user_data.h"
13 #include "third_party/blink/public/common/input/web_input_event.h"
14 
15 namespace metrics {
16 
17 class DesktopSessionDurationTracker;
18 
19 // Tracks user input events from web contents and notifies
20 // |DesktopSessionDurationTracker|.
21 class DesktopSessionDurationObserver
22     : public content::WebContentsObserver,
23       public content::WebContentsUserData<DesktopSessionDurationObserver>,
24       public content::RenderWidgetHost::InputEventObserver {
25  public:
26   DesktopSessionDurationObserver(content::WebContents* web_contents,
27                                  DesktopSessionDurationTracker* service);
28   ~DesktopSessionDurationObserver() override;
29 
30   static DesktopSessionDurationObserver* CreateForWebContents(
31       content::WebContents* web_contents);
32 
33  private:
34   friend class content::WebContentsUserData<DesktopSessionDurationObserver>;
35 
36   // Register / Unregister input event callback to given RenderViewHost
37   void RegisterInputEventObserver(content::RenderViewHost* host);
38   void UnregisterInputEventObserver(content::RenderViewHost* host);
39 
40   // content::RenderWidgetHost::InputEventObserver:
41   void OnInputEvent(const blink::WebInputEvent& event) override;
42 
43   // content::WebContentsObserver:
44   void RenderViewHostChanged(content::RenderViewHost* old_host,
45                              content::RenderViewHost* new_host) override;
46 
47   DesktopSessionDurationTracker* service_;
48 
49   WEB_CONTENTS_USER_DATA_KEY_DECL();
50 
51   DISALLOW_COPY_AND_ASSIGN(DesktopSessionDurationObserver);
52 };
53 
54 }  // namespace metrics
55 
56 #endif  // CHROME_BROWSER_METRICS_DESKTOP_SESSION_DURATION_DESKTOP_SESSION_DURATION_OBSERVER_H_
57