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

[tommi (sloooow) - chröme, 2012/04/24 11:36:18]

nit: use a consistent way of wrapping (see e.g. below)

[no longer working on chromium, 2012/04/25 13:52:51]

Done.

+  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 CaptureDeviceUser {

[tommi (sloooow) - chröme, 2012/04/24 11:36:18]

Please add some documentation.  It's not immediately obvious what this struct is
for (and there's no 'user' information being stored).

[no longer working on chromium, 2012/04/25 13:52:51]

Done.

+    CaptureDeviceUser(const std::string& url,
+                      const std::string device,
+                      content::MediaStreamDeviceType type)
+        : url(url),
+          device(device),
+          type(type) {}
+
+    std::string url;
+    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_