chrome/browser/ui/views/dark_mode_manager_linux.h

// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CHROME_BROWSER_UI_VIEWS_DARK_MODE_MANAGER_LINUX_H_
#define CHROME_BROWSER_UI_VIEWS_DARK_MODE_MANAGER_LINUX_H_

#include <string>

#include "base/memory/scoped_refptr.h"
#include "base/memory/weak_ptr.h"
#include "base/scoped_observation.h"
#include "ui/native_theme/native_theme_observer.h"

namespace dbus {
class Bus;
class ObjectProxy;
class Response;
class Signal;
}  // namespace dbus

namespace ui {

// Observes the system color scheme preference using
// org.freedesktop.portal.Settings. Falls back to the toolkit preference if
// org.freedesktop.portal.Settings is unavailable.  Propagates the dark mode
// preference to the web theme.
class DarkModeManagerLinux : public NativeThemeObserver {
 public:
  DarkModeManagerLinux();
  DarkModeManagerLinux(const DarkModeManagerLinux&) = delete;
  DarkModeManagerLinux& operator=(const DarkModeManagerLinux&) = delete;
  ~DarkModeManagerLinux() override;

 private:
  // ui::NativeThemeObserver:
  void OnNativeThemeUpdated(ui::NativeTheme* observed_theme) override;

  // D-Bus async handlers
  void OnSignalConnected(const std::string& interface_name,
                         const std::string& signal_name,
                         bool connected);
  void OnPortalSettingChanged(dbus::Signal* signal);
  void OnReadColorSchemeResponse(dbus::Response* response);

  // Sets `prefer_dark_theme_` and propagates to the web theme.
  void SetColorScheme(bool prefer_dark_theme);

  scoped_refptr<dbus::Bus> bus_;
  raw_ptr<dbus::ObjectProxy> settings_proxy_;

  bool prefer_dark_theme_ = false;

  base::ScopedObservation<NativeTheme, NativeThemeObserver>
      native_theme_observer_{this};

  base::WeakPtrFactory<DarkModeManagerLinux> weak_ptr_factory_{this};
};

}  // namespace ui

#endif  // CHROME_BROWSER_UI_VIEWS_DARK_MODE_MANAGER_LINUX_H_