Remove implementation of Panels on OSes other than ChromeOS.

chrome/browser/ui/cocoa/panels/display_settings_provider_cocoa.mm

-// 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 "base/bind.h"
-#include "base/macros.h"
-#include "base/memory/weak_ptr.h"
-#include "base/message_loop/message_loop.h"
-#include "base/threading/thread_task_runner_handle.h"
-#import "chrome/browser/app_controller_mac.h"
-#include "chrome/browser/chrome_notification_types.h"
-#include "chrome/browser/fullscreen.h"
-#include "chrome/browser/ui/browser.h"
-#include "chrome/browser/ui/browser_window.h"
-#include "chrome/browser/ui/cocoa/last_active_browser_cocoa.h"
-#include "chrome/browser/ui/panels/display_settings_provider.h"
-#include "content/public/browser/notification_observer.h"
-#include "content/public/browser/notification_registrar.h"
-#include "content/public/browser/notification_service.h"
-#include "content/public/browser/notification_source.h"
-#include "ui/base/work_area_watcher_observer.h"
-
-namespace {
-
-// The time, in milliseconds, that a fullscreen check will be started after
-// the active workspace change is notified. This value is from experiment.
-const int kCheckFullScreenDelayTimeMs = 200;
-
-class DisplaySettingsProviderCocoa : public DisplaySettingsProvider,
-                                     public ui::WorkAreaWatcherObserver,
-                                     public content::NotificationObserver {
- public:
-  DisplaySettingsProviderCocoa();
-  ~DisplaySettingsProviderCocoa() override;
-
-  void ActiveSpaceChanged();
-
- protected:
-  // Overridden from DisplaySettingsProvider:
-  bool NeedsPeriodicFullScreenCheck() const override;
-  bool IsFullScreen() override;
-
-  // Overridden from ui::WorkAreaWatcherObserver:
-  void WorkAreaChanged() override;
-
-  // Overridden from content::NotificationObserver:
-  void Observe(int type,
-               const content::NotificationSource& source,
-               const content::NotificationDetails& details) override;
-
- private:
-  void ActiveWorkSpaceChanged();
-
-  content::NotificationRegistrar registrar_;
-  id active_space_change_;
-
-  // Owned by MessageLoop after posting.
-  base::WeakPtrFactory<DisplaySettingsProviderCocoa> weak_factory_;
-
-  DISALLOW_COPY_AND_ASSIGN(DisplaySettingsProviderCocoa);
-};
-
-DisplaySettingsProviderCocoa::DisplaySettingsProviderCocoa()
-    : active_space_change_(nil),
-      weak_factory_(this) {
-  AppController* appController = static_cast<AppController*>([NSApp delegate]);
-  [appController addObserverForWorkAreaChange:this];
-
-  registrar_.Add(
-      this,
-      chrome::NOTIFICATION_FULLSCREEN_CHANGED,
-      content::NotificationService::AllSources());
-
-  active_space_change_ = [[[NSWorkspace sharedWorkspace] notificationCenter]
-      addObserverForName:NSWorkspaceActiveSpaceDidChangeNotification
-                  object:nil
-                   queue:[NSOperationQueue mainQueue]
-              usingBlock:^(NSNotification* notification) {
-                  ActiveWorkSpaceChanged();
-              }];
-}
-
-DisplaySettingsProviderCocoa::~DisplaySettingsProviderCocoa() {
-  AppController* appController = static_cast<AppController*>([NSApp delegate]);
-  [appController removeObserverForWorkAreaChange:this];
-
-  [[[NSWorkspace sharedWorkspace] notificationCenter]
-      removeObserver:active_space_change_];
-}
-
-bool DisplaySettingsProviderCocoa::NeedsPeriodicFullScreenCheck() const {
-  // Lion system introduces fullscreen support. When a window of an application
-  // enters fullscreen mode, the system will automatically hide all other
-  // windows, even including topmost windows that come from other applications.
-  // So we don't need to do anything when any other application enters
-  // fullscreen mode. We still need to handle the case when chrome enters
-  // fullscreen mode and our topmost windows will not get hided by the system.
-  return false;
-}
-
-bool DisplaySettingsProviderCocoa::IsFullScreen() {
-  Browser* browser = chrome::GetLastActiveBrowser();
-  if (!browser)
-    return false;
-  BrowserWindow* browser_window = browser->window();
-  if (!browser_window->IsFullscreen())
-    return false;
-
-  // If the user switches to another space where the fullscreen browser window
-  // does not live, we do not call it fullscreen.
-  NSWindow* native_window = browser_window->GetNativeWindow();
-  return [native_window isOnActiveSpace];
-}
-
-void DisplaySettingsProviderCocoa::WorkAreaChanged() {
-  OnDisplaySettingsChanged();
-}
-
-void DisplaySettingsProviderCocoa::Observe(
-    int type,
-    const content::NotificationSource& source,
-    const content::NotificationDetails& details) {
-  DCHECK_EQ(chrome::NOTIFICATION_FULLSCREEN_CHANGED, type);
-  // When we receive the fullscreen notification, the Chrome Window has not been
-  // put on the active space yet and thus IsFullScreen will return false.
-  // Since the fullscreen result is already known here, we can pass it dierctly
-  // to CheckFullScreenMode.
-  bool is_fullscreen = *(content::Details<bool>(details)).ptr();
-  CheckFullScreenMode(
-      is_fullscreen ? ASSUME_FULLSCREEN_ON : ASSUME_FULLSCREEN_OFF);
-}
-
-void DisplaySettingsProviderCocoa::ActiveWorkSpaceChanged() {
-  // The active workspace notification might be received earlier than the
-  // browser window knows that it is not in active space.
-  base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
-      FROM_HERE,
-      base::Bind(&DisplaySettingsProviderCocoa::CheckFullScreenMode,
-                 weak_factory_.GetWeakPtr(), PERFORM_FULLSCREEN_CHECK),
-      base::TimeDelta::FromMilliseconds(kCheckFullScreenDelayTimeMs));
-}
-
-}  // namespace
-
-// static
-DisplaySettingsProvider* DisplaySettingsProvider::Create() {
-  return new DisplaySettingsProviderCocoa();
-}