text: // Copyright 2014 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_MOJO_WEB_UI_CONTROLLER_H_
  #define CHROME_BROWSER_UI_WEBUI_MOJO_WEB_UI_CONTROLLER_H_
  
  #include <string>
  
  #include "base/memory/scoped_ptr.h"
  #include "base/memory/weak_ptr.h"
  #include "content/public/browser/web_ui_controller.h"
  #include "mojo/public/cpp/system/core.h"
  
  class MojoWebUIHandler;
  
  namespace content {
  class WebUIDataSource;
  }
  
  // MojoWebUIController is intended for web ui pages that use mojo. It is
  // expected that subclasses will do two things:
  // . In the constructor invoke AddMojoResourcePath() to register the bindings
  //   files, eg:
  //     AddMojoResourcePath("chrome/browser/ui/webui/omnibox/omnibox.mojom",
  //                         IDR_OMNIBOX_MOJO_JS);
  // . Override CreateUIHandler() to create the implementation of the bindings.
  class MojoWebUIController : public content::WebUIController {
   public:
    explicit MojoWebUIController(content::WebUI* contents);
    virtual ~MojoWebUIController();
  
    // WebUIController overrides:
    virtual void RenderViewCreated(
        content::RenderViewHost* render_view_host) OVERRIDE;
  
   protected:
    // Invoke to register mapping between binding file and resource id (IDR_...).
    void AddMojoResourcePath(const std::string& path, int resource_id);
  
    // Invoked to create the specific bindings implementation.
    virtual scoped_ptr<MojoWebUIHandler> CreateUIHandler(
        mojo::ScopedMessagePipeHandle handle_to_page) = 0;
  
   private:
    // Invoked in response to a connection from the renderer.
    void CreateAndStoreUIHandler(mojo::ScopedMessagePipeHandle handle);
  
    // Bindings files are registered here.
    content::WebUIDataSource* mojo_data_source_;
  
    scoped_ptr<MojoWebUIHandler> ui_handler_;
  
    base::WeakPtrFactory<MojoWebUIController> weak_factory_;
  
    DISALLOW_COPY_AND_ASSIGN(MojoWebUIController);
  };
  
  #endif  // CHROME_BROWSER_UI_WEBUI_MOJO_WEB_UI_CONTROLLER_H_
  