chrome/browser/ui/webui/settings/settings_page_ui_handler.h

// Copyright 2016 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_SETTINGS_SETTINGS_PAGE_UI_HANDLER_H_
#define CHROME_BROWSER_UI_WEBUI_SETTINGS_SETTINGS_PAGE_UI_HANDLER_H_

#include "base/macros.h"
#include "base/values.h"
#include "content/public/browser/web_ui_message_handler.h"

namespace settings {

// The base class handler of Javascript messages of settings pages.
class SettingsPageUIHandler : public content::WebUIMessageHandler {
 public:
  SettingsPageUIHandler();
  ~SettingsPageUIHandler() override;

  // WebUIMessageHandler implementation.
  void RegisterMessages() override {}

  // TODO(dbeam): move to WebUIMessageHandler?
  // Called when a navigation re-uses a renderer process (i.e. reload).
  virtual void RenderViewReused() {}

 protected:
  // Helper method for responding to JS requests initiated with
  // cr.sendWithPromise(), for the case where the returned promise should be
  // resolved (request succeeded).
  void ResolveJavascriptCallback(const base::Value& callback_id,
                                 const base::Value& response);

  // Helper method for responding to JS requests initiated with
  // cr.sendWithPromise(), for the case where the returned promise should be
  // rejected (request failed).
  void RejectJavascriptCallback(const base::Value& callback_id,
                                const base::Value& response);

 private:
  DISALLOW_COPY_AND_ASSIGN(SettingsPageUIHandler);
};

}  // namespace settings

#endif  // CHROME_BROWSER_UI_WEBUI_SETTINGS_SETTINGS_PAGE_UI_HANDLER_H_