| // Copyright 2013 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/webui/theme_handler.h" |
| |
| #include <memory> |
| |
| #include "base/functional/bind.h" |
| #include "base/values.h" |
| #include "chrome/browser/profiles/profile.h" |
| #include "chrome/browser/themes/theme_service.h" |
| #include "chrome/browser/themes/theme_service_factory.h" |
| #include "chrome/browser/ui/webui/theme_source.h" |
| #include "chrome/browser/ui/webui/webui_util.h" |
| #include "chrome/grit/theme_resources.h" |
| #include "content/public/browser/web_ui.h" |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| // ThemeHandler |
| |
| ThemeHandler::ThemeHandler() = default; |
| |
| ThemeHandler::~ThemeHandler() { |
| ThemeServiceFactory::GetForProfile(GetProfile())->RemoveObserver(this); |
| } |
| |
| void ThemeHandler::RegisterMessages() { |
| // These are not actual message registrations, but can't be done in the |
| // constructor since they need the web_ui value to be set, which is done |
| // post-construction, but before registering messages. |
| InitializeCSSCaches(); |
| web_ui()->RegisterMessageCallback( |
| "observeThemeChanges", |
| base::BindRepeating(&ThemeHandler::HandleObserveThemeChanges, |
| base::Unretained(this))); |
| } |
| |
| void ThemeHandler::OnJavascriptAllowed() { |
| // Listen for theme installation. |
| ThemeServiceFactory::GetForProfile(GetProfile())->AddObserver(this); |
| |
| // Or native theme change. |
| if (web_ui()) { |
| theme_observation_.Observe( |
| webui::GetNativeTheme(web_ui()->GetWebContents())); |
| } |
| } |
| |
| void ThemeHandler::OnJavascriptDisallowed() { |
| ThemeServiceFactory::GetForProfile(GetProfile())->RemoveObserver(this); |
| theme_observation_.Reset(); |
| } |
| |
| void ThemeHandler::OnThemeChanged() { |
| SendThemeChanged(); |
| } |
| |
| void ThemeHandler::OnNativeThemeUpdated(ui::NativeTheme* observed_theme) { |
| // There are two types of theme update. a) The observed theme change. e.g. |
| // switch between light/dark mode. b) A different theme is enabled. e.g. |
| // switch between GTK and classic theme on Linux. Reset observer in case b). |
| ui::NativeTheme* current_theme = |
| webui::GetNativeTheme(web_ui()->GetWebContents()); |
| if (observed_theme != current_theme) { |
| theme_observation_.Reset(); |
| theme_observation_.Observe(current_theme); |
| } |
| SendThemeChanged(); |
| } |
| |
| void ThemeHandler::HandleObserveThemeChanges( |
| const base::Value::List& /*args*/) { |
| AllowJavascript(); |
| } |
| |
| void ThemeHandler::SendThemeChanged() { |
| InitializeCSSCaches(); |
| bool has_custom_bg = ThemeService::GetThemeProviderForProfile(GetProfile()) |
| .HasCustomImage(IDR_THEME_NTP_BACKGROUND); |
| // TODO(dbeam): why does this need to be a dictionary? |
| base::Value::Dict dictionary; |
| dictionary.Set("hasCustomBackground", has_custom_bg); |
| FireWebUIListener("theme-changed", dictionary); |
| } |
| |
| void ThemeHandler::InitializeCSSCaches() { |
| Profile* profile = GetProfile(); |
| content::URLDataSource::Add(profile, std::make_unique<ThemeSource>(profile)); |
| } |
| |
| Profile* ThemeHandler::GetProfile() { |
| return Profile::FromWebUI(web_ui()); |
| } |