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// 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 "ui/gfx/sys_color_change_listener.h"
#include <windows.h>
#include "base/bind.h"
#include "base/bind_helpers.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/singleton.h"
#include "base/observer_list.h"
#include "ui/gfx/color_utils.h"
#include "ui/gfx/win/singleton_hwnd_observer.h"
namespace {
bool g_is_inverted_color_scheme = false;
bool g_is_inverted_color_scheme_initialized = false;
void UpdateInvertedColorScheme() {
int foreground_luminance = color_utils::GetLuminanceForColor(
color_utils::GetSysSkColor(COLOR_WINDOWTEXT));
int background_luminance = color_utils::GetLuminanceForColor(
color_utils::GetSysSkColor(COLOR_WINDOW));
HIGHCONTRAST high_contrast = {0};
high_contrast.cbSize = sizeof(HIGHCONTRAST);
g_is_inverted_color_scheme =
SystemParametersInfo(SPI_GETHIGHCONTRAST, 0, &high_contrast, 0) &&
((high_contrast.dwFlags & HCF_HIGHCONTRASTON) != 0) &&
foreground_luminance > background_luminance;
g_is_inverted_color_scheme_initialized = true;
}
} // namespace
namespace color_utils {
bool IsInvertedColorScheme() {
if (!g_is_inverted_color_scheme_initialized)
UpdateInvertedColorScheme();
return g_is_inverted_color_scheme;
}
} // namespace color_utils
namespace gfx {
class SysColorChangeObserver {
public:
static SysColorChangeObserver* GetInstance();
void AddListener(SysColorChangeListener* listener);
void RemoveListener(SysColorChangeListener* listener);
private:
friend struct base::DefaultSingletonTraits<SysColorChangeObserver>;
SysColorChangeObserver();
virtual ~SysColorChangeObserver();
void OnWndProc(HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam);
base::ObserverList<SysColorChangeListener> listeners_;
scoped_ptr<gfx::SingletonHwndObserver> singleton_hwnd_observer_;
};
// static
SysColorChangeObserver* SysColorChangeObserver::GetInstance() {
return base::Singleton<SysColorChangeObserver>::get();
}
SysColorChangeObserver::SysColorChangeObserver()
: singleton_hwnd_observer_(new SingletonHwndObserver(
base::Bind(&SysColorChangeObserver::OnWndProc,
base::Unretained(this)))) {}
SysColorChangeObserver::~SysColorChangeObserver() {}
void SysColorChangeObserver::AddListener(SysColorChangeListener* listener) {
listeners_.AddObserver(listener);
}
void SysColorChangeObserver::RemoveListener(SysColorChangeListener* listener) {
listeners_.RemoveObserver(listener);
}
void SysColorChangeObserver::OnWndProc(HWND hwnd,
UINT message,
WPARAM wparam,
LPARAM lparam) {
if (message == WM_SYSCOLORCHANGE ||
(message == WM_SETTINGCHANGE && wparam == SPI_SETHIGHCONTRAST)) {
UpdateInvertedColorScheme();
FOR_EACH_OBSERVER(SysColorChangeListener, listeners_, OnSysColorChange());
}
}
ScopedSysColorChangeListener::ScopedSysColorChangeListener(
SysColorChangeListener* listener)
: listener_(listener) {
SysColorChangeObserver::GetInstance()->AddListener(listener_);
}
ScopedSysColorChangeListener::~ScopedSysColorChangeListener() {
SysColorChangeObserver::GetInstance()->RemoveListener(listener_);
}
} // namespace gfx
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