| // 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. |
| |
| #ifndef UI_GFX_SYS_COLOR_CHANGE_LISTENER_H_ |
| #define UI_GFX_SYS_COLOR_CHANGE_LISTENER_H_ |
| |
| #include "base/basictypes.h" |
| #include "third_party/skia/include/core/SkColor.h" |
| #include "ui/gfx/gfx_export.h" |
| |
| namespace gfx { |
| |
| // Returns true only if Chrome should use an inverted color scheme - which is |
| // only true if the system has high-contrast mode enabled and and is using a |
| // light-on-dark color scheme. To be notified when this status changes, use |
| // ScopedSysColorChangeListener, below. |
| GFX_EXPORT bool IsInvertedColorScheme(); |
| |
| // Interface for classes that want to listen to system color changes. |
| class GFX_EXPORT SysColorChangeListener { |
| public: |
| virtual void OnSysColorChange() = 0; |
| |
| protected: |
| virtual ~SysColorChangeListener() {} |
| }; |
| |
| // Create an instance of this class in any object that wants to listen |
| // for system color changes. |
| class GFX_EXPORT ScopedSysColorChangeListener { |
| public: |
| explicit ScopedSysColorChangeListener(SysColorChangeListener* listener); |
| ~ScopedSysColorChangeListener(); |
| |
| private: |
| SysColorChangeListener* listener_; |
| |
| DISALLOW_COPY_AND_ASSIGN(ScopedSysColorChangeListener); |
| }; |
| |
| } // namespace gfx; |
| |
| #endif // UI_GFX_SYS_COLOR_CHANGE_LISTENER_H_ |