chrome/browser/ui/browser_window_theme_observer.cc

// Copyright 2026 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "chrome/browser/ui/browser_window_theme_observer.h"

#include "chrome/browser/themes/theme_service.h"
#include "chrome/browser/themes/theme_service_factory.h"
#include "chrome/browser/ui/browser_window/public/browser_window_interface.h"

DEFINE_USER_DATA(BrowserWindowThemeObserver);

BrowserWindowThemeObserver::BrowserWindowThemeObserver(
    BrowserWindowInterface* browser)
    : scoped_unowned_user_data_(browser->GetUnownedUserDataHost(), *this) {
  theme_service_observation_.Observe(
      ThemeServiceFactory::GetForProfile(browser->GetProfile()));
}

BrowserWindowThemeObserver::~BrowserWindowThemeObserver() = default;

// static
BrowserWindowThemeObserver* BrowserWindowThemeObserver::From(
    BrowserWindowInterface* browser) {
  return Get(browser->GetUnownedUserDataHost());
}

base::CallbackListSubscription
BrowserWindowThemeObserver::RegisterThemeChangedCallback(
    ThemeChangedCallback callback) {
  return theme_changed_callbacks_.Add(std::move(callback));
}

void BrowserWindowThemeObserver::NotifyThemeChanged(
    BrowserThemeChangeType type) {
  theme_changed_callbacks_.Notify(type);
}

void BrowserWindowThemeObserver::OnThemeChanged() {
  theme_changed_callbacks_.Notify(BrowserThemeChangeType::kBrowserTheme);
}