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#include "ash/high_contrast/high_contrast_controller.h"
6
7#include "ash/shell.h"
8#include "ui/aura/window_event_dispatcher.h"
9#include "ui/compositor/layer.h"
10
11namespace ash {
12
13HighContrastController::HighContrastController()
14    : enabled_(false) {
15  Shell::GetInstance()->AddShellObserver(this);
16}
17
18HighContrastController::~HighContrastController() {
19  Shell::GetInstance()->RemoveShellObserver(this);
20}
21
22void HighContrastController::SetEnabled(bool enabled) {
23  enabled_ = enabled;
24
25  // Update all active displays.
26  aura::Window::Windows root_window_list = Shell::GetAllRootWindows();
27  for (aura::Window::Windows::iterator it = root_window_list.begin();
28      it != root_window_list.end(); it++) {
29    UpdateDisplay(*it);
30  }
31}
32
33void HighContrastController::UpdateDisplay(aura::Window* root_window) {
34  root_window->layer()->SetLayerInverted(enabled_);
35}
36
37void HighContrastController::OnRootWindowAdded(aura::Window* root_window) {
38  UpdateDisplay(root_window);
39}
40
41}  // namespace ash
42