content/renderer/web_ui_mojo.h

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CONTENT_RENDERER_WEB_UI_MOJO_H_
   6 #define CONTENT_RENDERER_WEB_UI_MOJO_H_
   7
   8 #include <string>
   9
  10 #include "content/public/renderer/render_frame_observer.h"
  11 #include "content/public/renderer/render_view_observer.h"
  12 #include "content/public/renderer/render_view_observer_tracker.h"
  13 #include "third_party/mojo/src/mojo/public/cpp/system/core.h"
  14
  15 namespace gin {
  16 class PerContextData;
  17 }
  18
  19 namespace content {
  20
  21 class WebUIMojoContextState;
  22
  23 // WebUIMojo is responsible for enabling the renderer side of mojo bindings.
  24 // It creates (and destroys) a WebUIMojoContextState at the appropriate times
  25 // and handles the necessary browser messages. WebUIMojo destroys itself when
  26 // the RendererView it is created with is destroyed.
  27 class WebUIMojo
  28     : public RenderViewObserver,
  29       public RenderViewObserverTracker<WebUIMojo> {
  30  public:
  31   explicit WebUIMojo(RenderView* render_view);
  32
  33  private:
  34   class MainFrameObserver : public RenderFrameObserver {
  35    public:
  36     explicit MainFrameObserver(WebUIMojo* web_ui_mojo);
  37     ~MainFrameObserver() override;
  38
  39     // RenderFrameObserver overrides:
  40     void WillReleaseScriptContext(v8::Local<v8::Context> context,
  41                                   int world_id) override;
  42     void DidFinishDocumentLoad() override;
  43     // MainFrameObserver is inline owned by WebUIMojo and should not be
  44     // destroyed when the main RenderFrame is deleted. Overriding the
  45     // OnDestruct method allows this object to remain alive and be cleaned
  46     // up as part of WebUIMojo deletion.
  47     void OnDestruct() override;
  48
  49    private:
  50     WebUIMojo* web_ui_mojo_;
  51
  52     DISALLOW_COPY_AND_ASSIGN(MainFrameObserver);
  53   };
  54
  55   ~WebUIMojo() override;
  56
  57   void CreateContextState();
  58   void DestroyContextState(v8::Local<v8::Context> context);
  59
  60   // Invoked when the frame finishes loading. Invokes Run() on the
  61   // WebUIMojoContextState.
  62   void OnDidFinishDocumentLoad();
  63
  64   WebUIMojoContextState* GetContextState();
  65
  66   // RenderViewObserver overrides:
  67   void DidCreateDocumentElement(blink::WebLocalFrame* frame) override;
  68   void DidClearWindowObject(blink::WebLocalFrame* frame) override;
  69
  70   MainFrameObserver main_frame_observer_;
  71
  72   DISALLOW_COPY_AND_ASSIGN(WebUIMojo);
  73 };
  74
  75 }  // namespace content
  76
  77 #endif  // CONTENT_RENDERER_WEB_UI_MOJO_H_