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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef FUCHSIA_WEB_WEBENGINE_BROWSER_THEME_MANAGER_H_
#define FUCHSIA_WEB_WEBENGINE_BROWSER_THEME_MANAGER_H_
#include <fuchsia/settings/cpp/fidl.h>
#include <fuchsia/web/cpp/fidl.h>
#include <lib/sys/cpp/component_context.h>
#include <optional>
#include "base/fuchsia/process_context.h"
#include "content/public/browser/web_contents.h"
#include "fuchsia_web/webengine/web_engine_export.h"
#include "third_party/blink/public/common/web_preferences/web_preferences.h"
class WEB_ENGINE_EXPORT ThemeManager {
public:
explicit ThemeManager(content::WebContents* web_contents,
base::OnceClosure on_display_error);
~ThemeManager();
ThemeManager(const ThemeManager&) = delete;
ThemeManager& operator=(const ThemeManager&) = delete;
// Sets the |theme| requested by the FIDL caller, but does not apply the
// theme. Call |WebContents::OnWebPreferencesChanged| to apply the theme to
// web contents.
//
// If the |theme| is DEFAULT, then the theme provided by |display_service_|
// will be used. |on_display_error_| is run if |display_service_| is required
// but unavailable.
void SetTheme(fuchsia::settings::ThemeType theme);
// Override |blink_prefs| with theme set by |SetTheme|.
void ApplyThemeToWebPreferences(blink::web_pref::WebPreferences* web_prefs);
private:
// Attempts to connect to the fuchsia.settings.Display service.
// Returns true if a connection was created, or if one already exists.
// Return false if the service is unavailable.
bool EnsureDisplayService();
void WatchForDisplayChanges();
void OnWatchResultReceived(fuchsia::settings::DisplaySettings settings);
void OnDisplayServiceMissing();
bool observed_display_service_error_ = false;
bool did_receive_first_watch_result_ = false;
std::optional<fuchsia::settings::ThemeType> requested_theme_;
std::optional<fuchsia::settings::ThemeType> system_theme_;
content::WebContents* web_contents_;
fuchsia::settings::DisplayPtr display_service_;
base::OnceClosure on_display_error_;
};
#endif // FUCHSIA_WEB_WEBENGINE_BROWSER_THEME_MANAGER_H_