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// Copyright 2020 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 FUCHSIA_ENGINE_BROWSER_THEME_MANAGER_H_
#define FUCHSIA_ENGINE_BROWSER_THEME_MANAGER_H_
#include <fuchsia/settings/cpp/fidl.h>
#include <fuchsia/web/cpp/fidl.h>
#include <lib/sys/cpp/component_context.h>
#include "base/fuchsia/process_context.h"
#include "content/public/browser/web_contents.h"
#include "fuchsia/engine/web_engine_export.h"
class WEB_ENGINE_EXPORT ThemeManager {
public:
using OnSetThemeCompleteCallback = base::OnceCallback<void(bool)>;
explicit ThemeManager(content::WebContents* web_contents);
~ThemeManager();
ThemeManager(const ThemeManager&) = delete;
ThemeManager& operator=(const ThemeManager&) = delete;
// Sets the |theme| requested by the FIDL caller.
// If the |theme| is AUTO, then the theme provided by |display_service_|
// will be used.
// |on_set_complete| is run with |true| if the theme was set correctly,
// or |false| either if |theme| is invalid, or if |display_service_| is
// required but unavailable.
void SetTheme(fuchsia::settings::ThemeType theme,
OnSetThemeCompleteCallback on_set_complete);
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 ApplyTheme();
void WatchForDisplayChanges();
void OnWatchResultReceived(fuchsia::settings::DisplaySettings settings);
void OnDisplayServiceMissing();
bool observed_display_service_error_ = false;
bool did_receive_first_watch_result_ = false;
base::Optional<fuchsia::settings::ThemeType> requested_theme_;
base::Optional<fuchsia::settings::ThemeType> system_theme_;
content::WebContents* web_contents_;
fuchsia::settings::DisplayPtr display_service_;
OnSetThemeCompleteCallback on_set_complete_;
};
#endif // FUCHSIA_ENGINE_BROWSER_THEME_MANAGER_H_
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