Show camera and microphone status indicators.

chrome/browser/media/media_stream_capture_indicator.h

+// 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 CHROME_BROWSER_MEDIA_MEDIA_STREAM_CAPTURE_INDICATOR_H_
+#define CHROME_BROWSER_MEDIA_MEDIA_STREAM_CAPTURE_INDICATOR_H_
+#pragma once
+
+#include <list>
+#include <string>
+
+#include "content/public/common/media_stream_request.h"
+#include "third_party/skia/include/core/SkBitmap.h"
+#include "ui/base/models/simple_menu_model.h"
+
+class StatusIcon;
+class StatusTray;
+

[Nico, 2012/04/25 15:52:51]

class comment that explains why this exists / what it's used for

[no longer working on chromium, 2012/04/30 09:59:38]

Done.

+class MediaStreamCaptureIndicator :  public ui::SimpleMenuModel::Delegate {
+ public:
+  explicit MediaStreamCaptureIndicator();

[MAD, 2012/04/25 15:34:53]

I think you only need explicit when there is a single argument.

[no longer working on chromium, 2012/04/30 09:59:38]

Done.

+  virtual ~MediaStreamCaptureIndicator();
+
+  // Overrides from SimpleMenuModel::Delegate implementation.
+  virtual bool IsCommandIdChecked(int command_id) const OVERRIDE;
+  virtual bool IsCommandIdEnabled(int command_id) const OVERRIDE;
+  virtual bool GetAcceleratorForCommandId(int command_id,
+                                          ui::Accelerator* accelerator)
+  OVERRIDE;

[MAD, 2012/04/25 15:34:53]

OVERRIDE should be indented 4 columns... Or you could change the previous lines
to have this:

virtual bool GetAcceleratorForCommandId(
    int command_id, ui::Accelerator* accelerator) OVERRIDE;

[no longer working on chromium, 2012/04/30 09:59:38]

hope this is fine.

+  virtual void ExecuteCommand(int command_id) OVERRIDE;
+
+  // Called every time MediaStream opens the capture devices.
+  void OnCaptureDevicesOpened(const std::string& url,
+                              const content::MediaStreamDevices& devices);
+
+  // Called every time the MediaStream closes the opened devices.
+  void OnCaptureDevicesClosed(const std::string& url,
+                              const content::MediaStreamDevices& devices);
+
+ private:
+  // Struct to store the usage information of the capture devices.
+  struct CaptureDeviceUser {
+    CaptureDeviceUser(const std::string& url,
+                      const std::string device,

[MAD, 2012/04/25 15:34:53]

Why not a & reference here?

[no longer working on chromium, 2012/04/30 09:59:38]

a mistake, thanks.

+                      content::MediaStreamDeviceType type)
+        : host(url),
+          device(device),
+          type(type) {}
+
+    std::string host;
+    std::string device;
+    content::MediaStreamDeviceType type;
+  };
+
+  // Creates the status tray if it has not been created.
+  void CreateStatusTray();
+
+  // Makes sure we have done one-time initialization of the |icon_image_|.
+  void EnsureStatusTrayIcon();
+
+  // Triggers a balloon in the corner telling users devices are being used.
+  void ShowBalloon(const std::string& url,
+                   const content::MediaStreamDevices& devices);
+
+  // Hides the status tray from the desktop.
+  void Hide();
+
+  // Adds the new user to the device usage list.
+  void AddCaptureDeviceUser(const std::string& url,
+                            const content::MediaStreamDevices& devices);
+
+  // Removes the user from the device usage list.
+  void RemoveCaptureDeviceUser(const std::string& url,
+                               const content::MediaStreamDevices& devices);
+
+  // Updates the status tray menu with the new device list. This call will be
+  // triggered by both |AddCaptureDeviceUser| and |RemoveCaptureDeviceUser|.
+  void UpdateStatusTrayIconContextMenu();
+
+  // Reference to our status icon - owned by the StatusTray. If null,
+  // the platform doesn't support status icons.
+  StatusIcon* status_icon_;
+
+  // Icon to be displayed on the status tray.
+  SkBitmap icon_image_;
+
+  typedef std::list<CaptureDeviceUser> CaptureDeviceUserList;
+  CaptureDeviceUserList users_;
+};
+
+#endif  // CHROME_BROWSER_MEDIA_MEDIA_STREAM_CAPTURE_INDICATOR_H_