ui/gfx/win/singleton_hwnd_observer.cc

   1 // Copyright 2015 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 #include "ui/gfx/win/singleton_hwnd_observer.h"
   6
   7 #include "ui/gfx/win/singleton_hwnd.h"
   8
   9 namespace gfx {
  10
  11 SingletonHwndObserver::SingletonHwndObserver(const WndProc& wnd_proc)
  12     : wnd_proc_(wnd_proc) {
  13   DCHECK(!wnd_proc.is_null());
  14   SingletonHwnd::GetInstance()->AddObserver(this);
  15 }
  16
  17 SingletonHwndObserver::~SingletonHwndObserver() {
  18   ClearWndProc();
  19 }
  20
  21 void SingletonHwndObserver::ClearWndProc() {
  22   if (!wnd_proc_.is_null()) {
  23     SingletonHwnd::GetInstance()->RemoveObserver(this);
  24     wnd_proc_.Reset();
  25   }
  26 }
  27
  28 void SingletonHwndObserver::OnWndProc(HWND hwnd,
  29                                       UINT message,
  30                                       WPARAM wparam,
  31                                       LPARAM lparam) {
  32   wnd_proc_.Run(hwnd, message, wparam, lparam);
  33 }
  34
  35 }  // namespace gfx