chrome/browser/ui/views/status_icons/status_tray_win.h

   1 // Copyright (c) 2012 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_UI_VIEWS_STATUS_ICONS_STATUS_TRAY_WIN_H_
   6 #define CHROME_BROWSER_UI_VIEWS_STATUS_ICONS_STATUS_TRAY_WIN_H_
   7
   8 #include <windows.h>
   9
  10 #include "base/compiler_specific.h"
  11 #include "base/memory/scoped_ptr.h"
  12 #include "chrome/browser/status_icons/status_tray.h"
  13
  14 class StatusIconWin;
  15
  16 // A class that's responsible for increasing, if possible, the visibility
  17 // of a status tray icon on the taskbar. The default implementation sends
  18 // a task to a worker thread each time EnqueueChange is called.
  19 class StatusTrayStateChangerProxy {
  20  public:
  21   // Called by StatusTrayWin to request upgraded visibility on the icon
  22   // represented by the |icon_id|, |window| pair.
  23   virtual void EnqueueChange(UINT icon_id, HWND window) = 0;
  24 };
  25
  26 class StatusTrayWin : public StatusTray {
  27  public:
  28   StatusTrayWin();
  29   ~StatusTrayWin();
  30
  31   void UpdateIconVisibilityInBackground(StatusIconWin* status_icon);
  32
  33   // Exposed for testing.
  34   LRESULT CALLBACK
  35       WndProc(HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam);
  36
  37  protected:
  38   // Overriden from StatusTray:
  39   virtual StatusIcon* CreatePlatformStatusIcon(StatusIconType type,
  40                                                const gfx::ImageSkia& image,
  41                                                const base::string16& tool_tip)
  42       OVERRIDE;
  43
  44  private:
  45   FRIEND_TEST_ALL_PREFIXES(StatusTrayWinTest, EnsureVisibleTest);
  46
  47   // Static callback invoked when a message comes in to our messaging window.
  48   static LRESULT CALLBACK
  49       WndProcStatic(HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam);
  50
  51   UINT NextIconId();
  52
  53   void SetStatusTrayStateChangerProxyForTest(
  54       scoped_ptr<StatusTrayStateChangerProxy> proxy);
  55
  56   // The unique icon ID we will assign to the next icon.
  57   UINT next_icon_id_;
  58
  59   // The window class of |window_|.
  60   ATOM atom_;
  61
  62   // The handle of the module that contains the window procedure of |window_|.
  63   HMODULE instance_;
  64
  65   // The window used for processing events.
  66   HWND window_;
  67
  68   // The message ID of the "TaskbarCreated" message, sent to us when we need to
  69   // reset our status icons.
  70   UINT taskbar_created_message_;
  71
  72   // Manages changes performed on a background thread to manipulate visibility
  73   // of notification icons.
  74   scoped_ptr<StatusTrayStateChangerProxy> state_changer_proxy_;
  75
  76   DISALLOW_COPY_AND_ASSIGN(StatusTrayWin);
  77 };
  78
  79 #endif  // CHROME_BROWSER_UI_VIEWS_STATUS_ICONS_STATUS_TRAY_WIN_H_
  80