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      1 // Copyright (c) 2012 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 ANDROID_WEBVIEW_BROWSER_RENDER_HOST_RENDER_VIEW_HOST_EXT_H_
      6 #define ANDROID_WEBVIEW_BROWSER_RENDER_HOST_RENDER_VIEW_HOST_EXT_H_
      7 
      8 #include "content/public/browser/web_contents_observer.h"
      9 
     10 #include "android_webview/common/aw_hit_test_data.h"
     11 #include "base/callback_forward.h"
     12 #include "base/threading/non_thread_safe.h"
     13 #include "third_party/skia/include/core/SkColor.h"
     14 #include "ui/gfx/size.h"
     15 
     16 class GURL;
     17 
     18 namespace content {
     19 struct FrameNavigateParams;
     20 struct LoadCommittedDetails;
     21 }  // namespace content
     22 
     23 namespace android_webview {
     24 
     25 class AwRenderViewHostExtClient {
     26  public:
     27   // Called when the RenderView page scale changes.
     28   virtual void OnWebLayoutPageScaleFactorChanged(float page_scale_factor) = 0;
     29   virtual void OnWebLayoutContentsSizeChanged(
     30       const gfx::Size& contents_size) = 0;
     31 
     32  protected:
     33   virtual ~AwRenderViewHostExtClient() {}
     34 };
     35 
     36 // Provides RenderViewHost wrapper functionality for sending WebView-specific
     37 // IPC messages to the renderer and from there to WebKit.
     38 class AwRenderViewHostExt : public content::WebContentsObserver,
     39                             public base::NonThreadSafe {
     40  public:
     41 
     42   // To send receive messages to a RenderView we take the WebContents instance,
     43   // as it internally handles RenderViewHost instances changing underneath us.
     44   AwRenderViewHostExt(
     45       AwRenderViewHostExtClient* client, content::WebContents* contents);
     46   virtual ~AwRenderViewHostExt();
     47 
     48   // |result| will be invoked with the outcome of the request.
     49   typedef base::Callback<void(bool)> DocumentHasImagesResult;
     50   void DocumentHasImages(DocumentHasImagesResult result);
     51 
     52   // Clear all WebCore memory cache (not only for this view).
     53   void ClearCache();
     54 
     55   // Do a hit test at the view port coordinates and asynchronously update
     56   // |last_hit_test_data_|. |view_x| and |view_y| are in density independent
     57   // pixels used by blink::WebView.
     58   void RequestNewHitTestDataAt(int view_x, int view_y);
     59 
     60   // Optimization to avoid unnecessary Java object creation on hit test.
     61   bool HasNewHitTestData() const;
     62   void MarkHitTestDataRead();
     63 
     64   // Return |last_hit_test_data_|. Note that this is unavoidably racy;
     65   // the corresponding public WebView API is as well.
     66   const AwHitTestData& GetLastHitTestData() const;
     67 
     68   // Sets the zoom factor for text only. Used in layout modes other than
     69   // Text Autosizing.
     70   void SetTextZoomFactor(float factor);
     71 
     72   void SetFixedLayoutSize(const gfx::Size& size);
     73 
     74   void ResetScrollAndScaleState();
     75 
     76   // Sets the initial page scale. This overrides initial scale set by
     77   // the meta viewport tag.
     78   void SetInitialPageScale(double page_scale_factor);
     79   void SetBackgroundColor(SkColor c);
     80   void SetJsOnlineProperty(bool network_up);
     81 
     82  private:
     83   // content::WebContentsObserver implementation.
     84   virtual void RenderViewCreated(content::RenderViewHost* view_host) OVERRIDE;
     85   virtual void RenderProcessGone(base::TerminationStatus status) OVERRIDE;
     86   virtual void DidNavigateAnyFrame(
     87       const content::LoadCommittedDetails& details,
     88       const content::FrameNavigateParams& params) OVERRIDE;
     89   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
     90 
     91   void OnDocumentHasImagesResponse(int msg_id, bool has_images);
     92   void OnUpdateHitTestData(const AwHitTestData& hit_test_data);
     93   void OnPageScaleFactorChanged(float page_scale_factor);
     94   void OnContentsSizeChanged(const gfx::Size& contents_size);
     95 
     96   bool IsRenderViewReady() const;
     97 
     98   AwRenderViewHostExtClient* client_;
     99 
    100   SkColor background_color_;
    101 
    102   std::map<int, DocumentHasImagesResult> pending_document_has_images_requests_;
    103 
    104   // Master copy of hit test data on the browser side. This is updated
    105   // as a result of DoHitTest called explicitly or when the FocusedNodeChanged
    106   // is called in AwRenderViewExt.
    107   AwHitTestData last_hit_test_data_;
    108 
    109   bool has_new_hit_test_data_;
    110 
    111   DISALLOW_COPY_AND_ASSIGN(AwRenderViewHostExt);
    112 };
    113 
    114 }  // namespace android_webview
    115 
    116 #endif  // ANDROID_WEBVIEW_BROWSER_RENDER_HOST_RENDER_VIEW_HOST_EXT_H_
    117