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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 // A BrowserPluginEmbedder handles messages coming from a BrowserPlugin's
      6 // embedder that are not directed at any particular existing guest process.
      7 // In the beginning, when a BrowserPlugin instance in the embedder renderer
      8 // process requests an initial navigation, the WebContents for that renderer
      9 // renderer creates a BrowserPluginEmbedder for itself. The
     10 // BrowserPluginEmbedder, in turn, forwards the requests to a
     11 // BrowserPluginGuestManager, which creates and manages the lifetime of the new
     12 // guest.
     13 
     14 #ifndef CONTENT_BROWSER_BROWSER_PLUGIN_BROWSER_PLUGIN_EMBEDDER_H_
     15 #define CONTENT_BROWSER_BROWSER_PLUGIN_BROWSER_PLUGIN_EMBEDDER_H_
     16 
     17 #include <map>
     18 
     19 #include "base/memory/weak_ptr.h"
     20 #include "base/values.h"
     21 #include "content/public/browser/web_contents.h"
     22 #include "content/public/browser/web_contents_observer.h"
     23 #include "third_party/WebKit/public/web/WebDragOperation.h"
     24 
     25 struct BrowserPluginHostMsg_Attach_Params;
     26 struct BrowserPluginHostMsg_ResizeGuest_Params;
     27 
     28 namespace gfx {
     29 class Point;
     30 }
     31 
     32 namespace content {
     33 
     34 class BrowserPluginGuest;
     35 class BrowserPluginGuestManager;
     36 class BrowserPluginHostFactory;
     37 class RenderWidgetHostImpl;
     38 class WebContentsImpl;
     39 struct NativeWebKeyboardEvent;
     40 
     41 class CONTENT_EXPORT BrowserPluginEmbedder : public WebContentsObserver {
     42  public:
     43   virtual ~BrowserPluginEmbedder();
     44 
     45   static BrowserPluginEmbedder* Create(WebContentsImpl* web_contents);
     46 
     47   // Returns the RenderViewHost at a point (|x|, |y|) asynchronously via
     48   // |callback|. We need a roundtrip to renderer process to get this
     49   // information.
     50   void GetRenderViewHostAtPosition(
     51       int x,
     52       int y,
     53       const WebContents::GetRenderViewHostCallback& callback);
     54 
     55   // Called when embedder's |rwh| has sent screen rects to renderer.
     56   void DidSendScreenRects();
     57 
     58   // Called when embedder's WebContentsImpl has unhandled keyboard input.
     59   // Returns whether the BrowserPlugin has handled the keyboard event.
     60   // Currently we are only interested in checking for the escape key to
     61   // unlock hte guest's pointer lock.
     62   bool HandleKeyboardEvent(const NativeWebKeyboardEvent& event);
     63 
     64   // Overrides factory for testing. Default (NULL) value indicates regular
     65   // (non-test) environment.
     66   static void set_factory_for_testing(BrowserPluginHostFactory* factory) {
     67     factory_ = factory;
     68   }
     69 
     70   // WebContentsObserver implementation.
     71   virtual void RenderProcessGone(base::TerminationStatus status) OVERRIDE;
     72   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
     73 
     74   void DragSourceEndedAt(int client_x, int client_y, int screen_x,
     75       int screen_y, WebKit::WebDragOperation operation);
     76 
     77   void DragSourceMovedTo(int client_x, int client_y,
     78                          int screen_x, int screen_y);
     79 
     80   void OnUpdateDragCursor(bool* handled);
     81 
     82   void DragEnteredGuest(BrowserPluginGuest* guest);
     83 
     84   void DragLeftGuest(BrowserPluginGuest* guest);
     85 
     86   void StartDrag(BrowserPluginGuest* guest);
     87 
     88   void StopDrag(BrowserPluginGuest* guest);
     89 
     90   void SystemDragEnded();
     91 
     92  private:
     93   friend class TestBrowserPluginEmbedder;
     94 
     95   BrowserPluginEmbedder(WebContentsImpl* web_contents);
     96 
     97   void CleanUp();
     98 
     99   BrowserPluginGuestManager* GetBrowserPluginGuestManager();
    100 
    101   // Message handlers.
    102 
    103   void OnAllocateInstanceID(int request_id);
    104   void OnAttach(int instance_id,
    105                 const BrowserPluginHostMsg_Attach_Params& params,
    106                 const base::DictionaryValue& extra_params);
    107   void OnPluginAtPositionResponse(int instance_id,
    108                                   int request_id,
    109                                   const gfx::Point& position);
    110 
    111   // Static factory instance (always NULL for non-test).
    112   static BrowserPluginHostFactory* factory_;
    113 
    114   // Map that contains outstanding queries to |GetRenderViewHostAtPosition|.
    115   // We need a roundtrip to the renderer process to retrieve the answer,
    116   // so we store these callbacks until we hear back from the renderer.
    117   typedef std::map<int, WebContents::GetRenderViewHostCallback>
    118       GetRenderViewHostCallbackMap;
    119   GetRenderViewHostCallbackMap pending_get_render_view_callbacks_;
    120   // Next request id for BrowserPluginMsg_PluginAtPositionRequest query.
    121   int next_get_render_view_request_id_;
    122 
    123   // Used to correctly update the cursor when dragging over a guest, and to
    124   // handle a race condition when dropping onto the guest that started the drag
    125   // (the race is that the dragend message arrives before the drop message so
    126   // the drop never takes place).
    127   // crbug.com/233571
    128   base::WeakPtr<BrowserPluginGuest> guest_dragging_over_;
    129 
    130   // Pointer to the guest that started the drag, used to forward necessary drag
    131   // status messages to the correct guest.
    132   base::WeakPtr<BrowserPluginGuest> guest_started_drag_;
    133 
    134   DISALLOW_COPY_AND_ASSIGN(BrowserPluginEmbedder);
    135 };
    136 
    137 }  // namespace content
    138 
    139 #endif  // CONTENT_BROWSER_BROWSER_PLUGIN_BROWSER_PLUGIN_EMBEDDER_H_
    140