| // Copyright 2018 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. |
| |
| #ifndef CHROME_BROWSER_UI_WEBUI_DARK_MODE_HANDLER_H_ |
| #define CHROME_BROWSER_UI_WEBUI_DARK_MODE_HANDLER_H_ |
| |
| #include <memory> |
| #include <string> |
| |
| #include "base/macros.h" |
| #include "base/scoped_observer.h" |
| #include "content/public/browser/web_ui_message_handler.h" |
| #include "ui/native_theme/native_theme.h" |
| #include "ui/native_theme/native_theme_observer.h" |
| |
| namespace base { |
| class ListValue; |
| } // namespace base |
| |
| namespace content { |
| class WebUI; |
| class WebUIDataSource; |
| } // namespace content |
| |
| namespace ui { |
| class NativeTheme; |
| } // namespace ui |
| |
| class Profile; |
| |
| class DarkModeHandler : public content::WebUIMessageHandler, |
| public ui::NativeThemeObserver { |
| public: |
| ~DarkModeHandler() override; |
| |
| // Sets load-time constants on |source|. This handles a flicker-free initial |
| // page load (i.e. $i18n{dark}, loadTimeData.getBoolean('darkMode')). Adds a |
| // DarkModeHandler to |web_ui| if WebUI dark mode enhancements are enabled. |
| // If enabled, continually updates |source| by name if dark mode changes. This |
| // is so page refreshes will have fresh, correct data. Neither |web_ui| nor |
| // |source| may be nullptr. |
| static void Initialize(content::WebUI* web_ui, |
| content::WebUIDataSource* source); |
| |
| protected: |
| // Protected for testing. |
| static void InitializeInternal(content::WebUI* web_ui, |
| content::WebUIDataSource* source, |
| ui::NativeTheme* theme, |
| Profile* profile); |
| |
| explicit DarkModeHandler(ui::NativeTheme* theme, Profile* profile); |
| |
| private: |
| // content::WebUIMessageHandler: |
| void RegisterMessages() override; |
| void OnJavascriptDisallowed() override; |
| |
| // ui::NativeThemeObserver: |
| void OnNativeThemeUpdated(ui::NativeTheme* observed_theme) override; |
| |
| // Handles the "observeDarkMode" message. No arguments. Protected for testing. |
| void HandleObserveDarkMode(const base::ListValue* args); |
| |
| // Generates a dictionary with "dark" and "darkMode" i18n keys based on |
| // |using_dark_|. Called initialize and on each change for notifications. |
| std::unique_ptr<base::DictionaryValue> GetDataSourceUpdate() const; |
| |
| // Whether the feature is enabled and the system is in dark mode. |
| bool IsDarkModeEnabled() const; |
| |
| // Fire a webui listener notification if dark mode actually changed. |
| void NotifyIfChanged(); |
| |
| // The theme to query/watch for changes. Injected for testing. |
| ui::NativeTheme* const theme_; |
| |
| // Profile to update data sources on. Injected for testing. |
| Profile* const profile_; |
| |
| // Whether or not this page is using dark mode. |
| bool using_dark_; |
| |
| ScopedObserver<ui::NativeTheme, DarkModeHandler> observer_; |
| |
| // Populated if feature is enabled. |
| std::string source_name_; |
| |
| DISALLOW_COPY_AND_ASSIGN(DarkModeHandler); |
| }; |
| |
| #endif // CHROME_BROWSER_UI_WEBUI_DARK_MODE_HANDLER_H_ |