chrome/browser/android/contextualsearch/unhandled_tap_web_contents_observer.h

// 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_ANDROID_CONTEXTUALSEARCH_UNHANDLED_TAP_WEB_CONTENTS_OBSERVER_H_
#define CHROME_BROWSER_ANDROID_CONTEXTUALSEARCH_UNHANDLED_TAP_WEB_CONTENTS_OBSERVER_H_

#include "base/macros.h"
#include "content/public/browser/render_frame_host.h"
#include "content/public/browser/web_contents_observer.h"
#include "services/service_manager/public/cpp/binder_registry.h"

namespace contextual_search {

typedef base::RepeatingCallback<
    void(int x_px, int y_px, int font_size_dips, int text_run_length)>
    UnhandledTapCallback;

// Binds a Mojo unhandled-tap notifier message-handler to the frame host
// observed by this observer.
class UnhandledTapWebContentsObserver : public content::WebContentsObserver {
 public:
  // Creates an observer for the given |web_contents| that binds a Mojo request
  // for an endpoint to the UnhandledTapNotifier service.  This will create an
  // instance of the contextual_search::CreateUnhandledTapNotifierImpl to handle
  // those messages.  May use the given |scale_factor| to convert from dips to
  // pixels for tap coordinates when calling back through the given |callback|.
  UnhandledTapWebContentsObserver(content::WebContents* web_contents,
                                  float device_scale_factor,
                                  UnhandledTapCallback callback);

  ~UnhandledTapWebContentsObserver() override;

 private:
  // content::WebContentsObserver implementation.
  void OnInterfaceRequestFromFrame(
      content::RenderFrameHost* render_frame_host,
      const std::string& interface_name,
      mojo::ScopedMessagePipeHandle* interface_pipe) override;

  service_manager::BinderRegistry registry_;

  DISALLOW_COPY_AND_ASSIGN(UnhandledTapWebContentsObserver);
};

}  // namespace contextual_search

#endif  // CHROME_BROWSER_ANDROID_CONTEXTUALSEARCH_UNHANDLED_TAP_WEB_CONTENTS_OBSERVER_H_