root/chrome/browser/ui/panels/display_settings_provider.cc

DEFINITIONS

1. AddDisplayObserver
2. RemoveDisplayObserver
3. AddDesktopBarObserver
4. RemoveDesktopBarObserver
5. AddFullScreenObserver
6. RemoveFullScreenObserver
7. GetPrimaryDisplayArea
8. GetPrimaryWorkArea
9. GetDisplayAreaMatching
10. GetWorkAreaMatching
11. OnDisplaySettingsChanged
12. IsAutoHidingDesktopBarEnabled
13. GetDesktopBarThickness
14. GetDesktopBarVisibility
15. NeedsPeriodicFullScreenCheck
16. CheckFullScreenMode
17. IsFullScreen
18. Create

// 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 "chrome/browser/ui/panels/display_settings_provider.h"

#include "base/bind.h"
#include "base/logging.h"
#include "chrome/browser/fullscreen.h"
#include "ui/gfx/screen.h"

namespace {
// The polling interval to check any display settings change, like full-screen
// mode changes.
const int kFullScreenModeCheckIntervalMs = 1000;
}  // namespace

DisplaySettingsProvider::DisplaySettingsProvider()
    : is_full_screen_(false) {
}

DisplaySettingsProvider::~DisplaySettingsProvider() {
}

void DisplaySettingsProvider::AddDisplayObserver(DisplayObserver* observer) {
  display_observers_.AddObserver(observer);
}

void DisplaySettingsProvider::RemoveDisplayObserver(DisplayObserver* observer) {
  display_observers_.RemoveObserver(observer);
}

void DisplaySettingsProvider::AddDesktopBarObserver(
    DesktopBarObserver* observer) {
  desktop_bar_observers_.AddObserver(observer);
}

void DisplaySettingsProvider::RemoveDesktopBarObserver(
    DesktopBarObserver* observer) {
  desktop_bar_observers_.RemoveObserver(observer);
}

void DisplaySettingsProvider::AddFullScreenObserver(
    FullScreenObserver* observer) {
  is_full_screen_ = IsFullScreen();
  bool already_started = full_screen_observers_.might_have_observers();
  full_screen_observers_.AddObserver(observer);

  if (!already_started && NeedsPeriodicFullScreenCheck()) {
    full_screen_mode_timer_.Start(FROM_HERE,
        base::TimeDelta::FromMilliseconds(kFullScreenModeCheckIntervalMs),
        base::Bind(&DisplaySettingsProvider::CheckFullScreenMode,
                   base::Unretained(this),
                   PERFORM_FULLSCREEN_CHECK));
  }
}

void DisplaySettingsProvider::RemoveFullScreenObserver(
    FullScreenObserver* observer) {
  full_screen_observers_.RemoveObserver(observer);

  if (!full_screen_observers_.might_have_observers())
    full_screen_mode_timer_.Stop();
}

// TODO(scottmg): This should be moved to ui/.
gfx::Rect DisplaySettingsProvider::GetPrimaryDisplayArea() const {
  // TODO(scottmg): NativeScreen is wrong. http://crbug.com/133312
  return gfx::Screen::GetNativeScreen()->GetPrimaryDisplay().bounds();
}

gfx::Rect DisplaySettingsProvider::GetPrimaryWorkArea() const {
#if defined(OS_MACOSX)
  // On OSX, panels should be dropped all the way to the bottom edge of the
  // screen (and overlap Dock). And we also want to exclude the system menu
  // area. Note that the rect returned from gfx::Screen util functions is in
  // platform-independent screen coordinates with (0, 0) as the top-left corner.
  // TODO(scottmg): NativeScreen is wrong. http://crbug.com/133312
  gfx::Display display = gfx::Screen::GetNativeScreen()->GetPrimaryDisplay();
  gfx::Rect display_area = display.bounds();
  gfx::Rect work_area = display.work_area();
  int system_menu_height = work_area.y() - display_area.y();
  if (system_menu_height > 0) {
    display_area.set_y(display_area.y() + system_menu_height);
    display_area.set_height(display_area.height() - system_menu_height);
  }
  return display_area;
#else
  // TODO(scottmg): NativeScreen is wrong. http://crbug.com/133312
  return gfx::Screen::GetNativeScreen()->GetPrimaryDisplay().work_area();
#endif
}

gfx::Rect DisplaySettingsProvider::GetDisplayAreaMatching(
    const gfx::Rect& bounds) const {
  // TODO(scottmg): NativeScreen is wrong. http://crbug.com/133312
  return gfx::Screen::GetNativeScreen()->GetDisplayMatching(bounds).bounds();
}

gfx::Rect DisplaySettingsProvider::GetWorkAreaMatching(
    const gfx::Rect& bounds) const {
  // TODO(scottmg): NativeScreen is wrong. http://crbug.com/133312
  gfx::Screen* screen = gfx::Screen::GetNativeScreen();
  gfx::Display display = screen->GetDisplayMatching(bounds);
  if (display.bounds() == screen->GetPrimaryDisplay().bounds())
    return GetPrimaryWorkArea();
  return display.work_area();
}

void DisplaySettingsProvider::OnDisplaySettingsChanged() {
  FOR_EACH_OBSERVER(DisplayObserver, display_observers_, OnDisplayChanged());
}

bool DisplaySettingsProvider::IsAutoHidingDesktopBarEnabled(
    DesktopBarAlignment alignment) {
  return false;
}

int DisplaySettingsProvider::GetDesktopBarThickness(
    DesktopBarAlignment alignment) const {
  return 0;
}

DisplaySettingsProvider::DesktopBarVisibility
DisplaySettingsProvider::GetDesktopBarVisibility(
    DesktopBarAlignment alignment) const {
  return DESKTOP_BAR_VISIBLE;
}

bool DisplaySettingsProvider::NeedsPeriodicFullScreenCheck() const {
  return true;
}

void DisplaySettingsProvider::CheckFullScreenMode(
    FullScreenCheckMode check_mode) {
  bool is_full_screen = false;
  switch (check_mode) {
    case ASSUME_FULLSCREEN_ON:
      is_full_screen = true;
      break;
    case ASSUME_FULLSCREEN_OFF:
      is_full_screen = false;
      break;
    case PERFORM_FULLSCREEN_CHECK:
      is_full_screen = IsFullScreen();
      break;
    default:
      NOTREACHED();
      break;
  }
  if (is_full_screen == is_full_screen_)
    return;
  is_full_screen_ = is_full_screen;

  FOR_EACH_OBSERVER(FullScreenObserver,
                    full_screen_observers_,
                    OnFullScreenModeChanged(is_full_screen_));
}

bool DisplaySettingsProvider::IsFullScreen() {
  return IsFullScreenMode();
}

#if defined(USE_AURA)
// static
DisplaySettingsProvider* DisplaySettingsProvider::Create() {
  return new DisplaySettingsProvider();
}
#endif