Move Fullscreen stuff onto FullscreenHandler type that hangs off NWW. This is the first step in mov…

ui/views/win/scoped_fullscreen_visibility.cc

Index: ui/views/win/scoped_fullscreen_visibility.cc
===================================================================
--- ui/views/win/scoped_fullscreen_visibility.cc	(revision 0)
+++ ui/views/win/scoped_fullscreen_visibility.cc	(revision 0)
@@ -0,0 +1,53 @@
+// 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.
+
+#include "ui/views/win/scoped_fullscreen_visibility.h"
+
+#include "base/logging.h"
+
+namespace views {
+
+// static
+std::map<HWND, int>* ScopedFullscreenVisibility::full_screen_windows_ = NULL;
+
+ScopedFullscreenVisibility::ScopedFullscreenVisibility(HWND hwnd)
+    : hwnd_(hwnd) {
+  if (!full_screen_windows_)
+    full_screen_windows_ = new FullscreenHWNDs;
+  FullscreenHWNDs::iterator it = full_screen_windows_->find(hwnd_);
+  if (it != full_screen_windows_->end()) {
+    it->second++;
+  } else {
+    full_screen_windows_->insert(std::make_pair(hwnd_, 1));
+    // NOTE: Be careful not to activate any windows here (for example, calling
+    // ShowWindow(SW_HIDE) will automatically activate another window).  This
+    // code can be called while a window is being deactivated, and activating
+    // another window will screw up the activation that is already in progress.
+    SetWindowPos(hwnd_, NULL, 0, 0, 0, 0,
+                 SWP_HIDEWINDOW | SWP_NOACTIVATE | SWP_NOMOVE |
+                 SWP_NOREPOSITION | SWP_NOSIZE | SWP_NOZORDER);
+  }
+}
+
+ScopedFullscreenVisibility::~ScopedFullscreenVisibility() {
+  FullscreenHWNDs::iterator it = full_screen_windows_->find(hwnd_);
+  DCHECK(it != full_screen_windows_->end());
+  if (--it->second == 0) {
+    full_screen_windows_->erase(it);
+    ShowWindow(hwnd_, SW_SHOW);
+  }
+  if (full_screen_windows_->empty()) {
+    delete full_screen_windows_;
+    full_screen_windows_ = NULL;
+  }
+}
+
+// static
+bool ScopedFullscreenVisibility::IsHiddenForFullscreen(HWND hwnd) {
+  if (!full_screen_windows_)
+    return false;
+  return full_screen_windows_->find(hwnd) != full_screen_windows_->end();
+}
+
+}  // namespace views