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#ifndef UI_GFX_SYS_COLOR_CHANGE_LISTENER_H_
6#define UI_GFX_SYS_COLOR_CHANGE_LISTENER_H_
7
8#include "base/basictypes.h"
9#include "third_party/skia/include/core/SkColor.h"
10#include "ui/gfx/gfx_export.h"
11
12namespace gfx {
13
14// Returns true only if Chrome should use an inverted color scheme - which is
15// only true if the system has high-contrast mode enabled and and is using a
16// light-on-dark color scheme. To be notified when this status changes, use
17// ScopedSysColorChangeListener, below.
18GFX_EXPORT bool IsInvertedColorScheme();
19
20// Interface for classes that want to listen to system color changes.
21class GFX_EXPORT SysColorChangeListener {
22 public:
23  virtual void OnSysColorChange() = 0;
24
25 protected:
26  virtual ~SysColorChangeListener() {}
27};
28
29// Create an instance of this class in any object that wants to listen
30// for system color changes.
31class GFX_EXPORT ScopedSysColorChangeListener {
32 public:
33  explicit ScopedSysColorChangeListener(SysColorChangeListener* listener);
34  ~ScopedSysColorChangeListener();
35
36 private:
37  SysColorChangeListener* listener_;
38
39  DISALLOW_COPY_AND_ASSIGN(ScopedSysColorChangeListener);
40};
41
42}  // namespace gfx;
43
44#endif  // UI_GFX_SYS_COLOR_CHANGE_LISTENER_H_
45