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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 <memory>
- #include "base/bind.h"
- #include "base/callback_helpers.h"
- #include "base/memory/singleton.h"
- #include "base/observer_list.h"
- #include "ui/gfx/win/singleton_hwnd_observer.h"
- 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>::Unchecked listeners_;
- std::unique_ptr<gfx::SingletonHwndObserver> singleton_hwnd_observer_;
- };
- // static
- SysColorChangeObserver* SysColorChangeObserver::GetInstance() {
- return base::Singleton<SysColorChangeObserver>::get();
- }
- SysColorChangeObserver::SysColorChangeObserver()
- : singleton_hwnd_observer_(new SingletonHwndObserver(
- base::BindRepeating(&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)) {
- for (SysColorChangeListener& observer : listeners_)
- observer.OnSysColorChange();
- }
- }
- ScopedSysColorChangeListener::ScopedSysColorChangeListener(
- SysColorChangeListener* listener)
- : listener_(listener) {
- SysColorChangeObserver::GetInstance()->AddListener(listener_);
- }
- ScopedSysColorChangeListener::~ScopedSysColorChangeListener() {
- SysColorChangeObserver::GetInstance()->RemoveListener(listener_);
- }
- } // namespace gfx
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