components/dom_distiller/content/renderer/distiller_native_javascript.h

// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef COMPONENTS_DOM_DISTILLER_CONTENT_RENDERER_DISTILLER_NATIVE_JAVASCRIPT_H_
#define COMPONENTS_DOM_DISTILLER_CONTENT_RENDERER_DISTILLER_NATIVE_JAVASCRIPT_H_

#include "base/memory/raw_ptr.h"
#include "base/memory/weak_ptr.h"
#include "components/dom_distiller/content/common/mojom/distiller_javascript_service.mojom.h"
#include "content/public/renderer/render_frame.h"
#include "content/public/renderer/render_frame_observer.h"
#include "mojo/public/cpp/bindings/remote.h"
#include "v8/include/v8.h"

namespace dom_distiller {

// This class is the primary interface for custom JavaScript introduced by the
// dom-distiller. Callbacks for JavaScript functionality and the communication
// channel to the browser process are maintained here.
class DistillerNativeJavaScript {
 public:
  explicit DistillerNativeJavaScript(content::RenderFrame* render_frame);
  ~DistillerNativeJavaScript();

  // Add the "distiller" JavaScript object and its functions to the current
  // |RenderFrame|.
  void AddJavaScriptObjectToFrame(v8::Local<v8::Context> context);

 private:
  // Add a function to the provided object.
  template <typename Sig>
  void BindFunctionToObject(v8::Isolate* isolate,
                            v8::Local<v8::Object> javascript_object,
                            const std::string& name,
                            const base::RepeatingCallback<Sig>& callback);

  // Make sure the mojo service is connected.
  void EnsureServiceConnected();

  // Wrappers to convert integer representations of the pref enums, then send
  // the enum values to the browser process.
  void StoreIntTheme(int theme);
  void StoreIntFontFamily(int font_family);
  void StoreFloatFontScaling(float font_scale);

  raw_ptr<content::RenderFrame> render_frame_;
  mojo::Remote<mojom::DistillerJavaScriptService> distiller_js_service_;

  base::WeakPtrFactory<DistillerNativeJavaScript> weak_factory_{this};
};

// static
v8::Local<v8::Object> GetOrCreateDistillerObject(
    v8::Isolate* isolate,
    v8::Local<v8::Context> context);

}  // namespace dom_distiller

#endif  // COMPONENTS_DOM_DISTILLER_CONTENT_RENDERER_DISTILLER_NATIVE_JAVASCRIPT_H_