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   virtual ~StatusTrayStateChangerProxy() {}
  22
  23   // Called by StatusTrayWin to request upgraded visibility on the icon
  24   // represented by the |icon_id|, |window| pair.
  25   virtual void EnqueueChange(UINT icon_id, HWND window) = 0;
  26 };
  27
  28 class StatusTrayWin : public StatusTray {
  29  public:
  30   StatusTrayWin();
  31   ~StatusTrayWin();
  32
  33   void UpdateIconVisibilityInBackground(StatusIconWin* status_icon);
  34
  35   // Exposed for testing.
  36   LRESULT CALLBACK
  37       WndProc(HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam);
  38
  39  protected:
  40   // Overriden from StatusTray:
  41   virtual StatusIcon* CreatePlatformStatusIcon(StatusIconType type,
  42                                                const gfx::ImageSkia& image,
  43                                                const base::string16& tool_tip)
  44       override;
  45
  46  private:
  47   FRIEND_TEST_ALL_PREFIXES(StatusTrayWinTest, EnsureVisibleTest);
  48
  49   // Static callback invoked when a message comes in to our messaging window.
  50   static LRESULT CALLBACK
  51       WndProcStatic(HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam);
  52
  53   UINT NextIconId();
  54
  55   void SetStatusTrayStateChangerProxyForTest(
  56       scoped_ptr<StatusTrayStateChangerProxy> proxy);
  57
  58   // The unique icon ID we will assign to the next icon.
  59   UINT next_icon_id_;
  60
  61   // The window class of |window_|.
  62   ATOM atom_;
  63
  64   // The handle of the module that contains the window procedure of |window_|.
  65   HMODULE instance_;
  66
  67   // The window used for processing events.
  68   HWND window_;
  69
  70   // The message ID of the "TaskbarCreated" message, sent to us when we need to
  71   // reset our status icons.
  72   UINT taskbar_created_message_;
  73
  74   // Manages changes performed on a background thread to manipulate visibility
  75   // of notification icons.
  76   scoped_ptr<StatusTrayStateChangerProxy> state_changer_proxy_;
  77
  78   DISALLOW_COPY_AND_ASSIGN(StatusTrayWin);
  79 };
  80
  81 #endif  // CHROME_BROWSER_UI_VIEWS_STATUS_ICONS_STATUS_TRAY_WIN_H_
  82