components/dom_distiller/content/distiller_page_web_contents.h

   1 // Copyright 2013 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 COMPONENTS_DOM_DISTILLER_CONTENT_DISTILLER_PAGE_WEB_CONTENTS_H_
   6 #define COMPONENTS_DOM_DISTILLER_CONTENT_DISTILLER_PAGE_WEB_CONTENTS_H_
   7
   8 #include <string>
   9
  10 #include "base/memory/scoped_ptr.h"
  11 #include "components/dom_distiller/core/distiller_page.h"
  12 #include "content/public/browser/web_contents.h"
  13 #include "content/public/browser/web_contents_delegate.h"
  14 #include "content/public/browser/web_contents_observer.h"
  15 #include "url/gurl.h"
  16
  17 namespace dom_distiller {
  18
  19 class SourcePageHandleWebContents : public SourcePageHandle {
  20  public:
  21   SourcePageHandleWebContents(content::WebContents* web_contents, bool owned);
  22   ~SourcePageHandleWebContents() override;
  23
  24   // Retreives the WebContents. The SourcePageHandleWebContents keeps ownership.
  25   content::WebContents* web_contents() { return web_contents_; }
  26
  27  private:
  28   // The WebContents this class holds.
  29   content::WebContents* web_contents_;
  30   // Whether this owns |web_contents_|.
  31   bool owned_;
  32 };
  33
  34 class DistillerPageWebContentsFactory : public DistillerPageFactory {
  35  public:
  36   explicit DistillerPageWebContentsFactory(
  37       content::BrowserContext* browser_context)
  38       : DistillerPageFactory(), browser_context_(browser_context) {}
  39   ~DistillerPageWebContentsFactory() override {}
  40
  41   scoped_ptr<DistillerPage> CreateDistillerPage(
  42       const gfx::Size& render_view_size) const override;
  43   scoped_ptr<DistillerPage> CreateDistillerPageWithHandle(
  44       scoped_ptr<SourcePageHandle> handle) const override;
  45
  46  private:
  47   content::BrowserContext* browser_context_;
  48 };
  49
  50 class DistillerPageWebContents : public DistillerPage,
  51                                  public content::WebContentsDelegate,
  52                                  public content::WebContentsObserver {
  53  public:
  54   DistillerPageWebContents(
  55       content::BrowserContext* browser_context,
  56       const gfx::Size& render_view_size,
  57       scoped_ptr<SourcePageHandleWebContents> optional_web_contents_handle);
  58   ~DistillerPageWebContents() override;
  59
  60   // content::WebContentsDelegate implementation.
  61   gfx::Size GetSizeForNewRenderView(
  62       content::WebContents* web_contents) const override;
  63
  64   // content::WebContentsObserver implementation.
  65   void DocumentLoadedInFrame(
  66       content::RenderFrameHost* render_frame_host) override;
  67
  68   void DidFailLoad(content::RenderFrameHost* render_frame_host,
  69                    const GURL& validated_url,
  70                    int error_code,
  71                    const base::string16& error_description) override;
  72
  73  protected:
  74   bool StringifyOutput() override;
  75   bool CreateNewContext() override;
  76   void DistillPageImpl(const GURL& url, const std::string& script) override;
  77
  78  private:
  79   friend class TestDistillerPageWebContents;
  80
  81   enum State {
  82     // The page distiller is idle.
  83     IDLE,
  84     // A page is currently loading.
  85     LOADING_PAGE,
  86     // There was an error processing the page.
  87     PAGELOAD_FAILED,
  88     // JavaScript is executing within the context of the page. When the
  89     // JavaScript completes, the state will be returned to |IDLE|.
  90     EXECUTING_JAVASCRIPT
  91   };
  92
  93   // Creates a new WebContents, adds |this| as an observer, and loads the
  94   // |url|.
  95   virtual void CreateNewWebContents(const GURL& url);
  96
  97   // Injects and executes JavaScript in the context of a loaded page. This
  98   // must only be called after the page has successfully loaded.
  99   void ExecuteJavaScript();
 100
 101   // Called when the distillation is done or if the page load failed.
 102   void OnWebContentsDistillationDone(const GURL& page_url,
 103                                      const base::Value* value);
 104
 105   // The current state of the |DistillerPage|, initially |IDLE|.
 106   State state_;
 107
 108   // The JavaScript to inject to extract content.
 109   std::string script_;
 110
 111   scoped_ptr<SourcePageHandleWebContents> source_page_handle_;
 112
 113   content::BrowserContext* browser_context_;
 114   gfx::Size render_view_size_;
 115   DISALLOW_COPY_AND_ASSIGN(DistillerPageWebContents);
 116 };
 117
 118 }  // namespace dom_distiller
 119
 120 #endif  // COMPONENTS_DOM_DISTILLER_CONTENT_DISTILLER_PAGE_WEB_CONTENTS_H_