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// 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/callback.h"
#include "base/macros.h"
#include "base/scoped_observer.h"
#include "chrome/browser/ui/dark_mode_observer.h"
#include "content/public/browser/web_ui_message_handler.h"
#include "ui/native_theme/native_theme.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:
~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;
// Handles the "observeDarkMode" message. No arguments. Protected for testing.
void HandleObserveDarkMode(const base::ListValue* args);
bool UseDarkMode() const;
// Generates a dictionary with "dark" i18n key based on |using_dark_|. Called
// in Initialize() and on each change for notifications.
std::unique_ptr<base::DictionaryValue> GetDataSourceUpdate() const;
void OnDarkModeChanged(bool dark_mode);
// Profile to update data sources on. Injected for testing.
Profile* const profile_;
DarkModeObserver dark_mode_observer_;
// Populated if feature is enabled.
std::string source_name_;
DISALLOW_COPY_AND_ASSIGN(DarkModeHandler);
};
#endif // CHROME_BROWSER_UI_WEBUI_DARK_MODE_HANDLER_H_