content/browser/browser_plugin/browser_plugin_embedder.h

   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 "base/memory/weak_ptr.h"
  18 #include "content/public/browser/web_contents.h"
  19 #include "content/public/browser/web_contents_observer.h"
  20 #include "third_party/WebKit/public/web/WebDragOperation.h"
  21
  22 struct BrowserPluginHostMsg_Attach_Params;
  23
  24 namespace content {
  25
  26 class BrowserPluginGuest;
  27 class BrowserPluginGuestManager;
  28 class RenderWidgetHostImpl;
  29 struct NativeWebKeyboardEvent;
  30
  31 class CONTENT_EXPORT BrowserPluginEmbedder : public WebContentsObserver {
  32  public:
  33   ~BrowserPluginEmbedder() override;
  34
  35   static BrowserPluginEmbedder* Create(WebContentsImpl* web_contents);
  36
  37   // Called when embedder's |rwh| has sent screen rects to renderer.
  38   void DidSendScreenRects();
  39
  40   // WebContentsObserver implementation.
  41   bool OnMessageReceived(const IPC::Message& message) override;
  42   bool OnMessageReceived(const IPC::Message& message,
  43                          RenderFrameHost* render_frame_host) override;
  44
  45   // Sends a 'dragend' message to the guest that started the drag.
  46   void DragSourceEndedAt(int client_x, int client_y, int screen_x,
  47       int screen_y, blink::WebDragOperation operation);
  48
  49   // Indicates that a drag operation has entered into the bounds of a given
  50   // |guest|. Returns whether the |guest| also started the operation.
  51   bool DragEnteredGuest(BrowserPluginGuest* guest);
  52
  53   // Indicates that a drag operation has left the bounds of a given |guest|.
  54   void DragLeftGuest(BrowserPluginGuest* guest);
  55
  56   // Called when the screen info has changed.
  57   void ScreenInfoChanged();
  58
  59   // Closes modal dialogs in all of the guests.
  60   void CancelGuestDialogs();
  61
  62   // Called by WebContentsViewGuest when a drag operation is started within
  63   // |guest|. This |guest| will be signaled at the end of the drag operation.
  64   void StartDrag(BrowserPluginGuest* guest);
  65
  66   // Sends EndSystemDrag message to the guest that initiated the last drag/drop
  67   // operation, if there's any.
  68   void SystemDragEnded();
  69
  70   // Used to handle special keyboard events.
  71   bool HandleKeyboardEvent(const NativeWebKeyboardEvent& event);
  72
  73   // Returns the "full page" guest if there is one. That is, if there is a
  74   // single BrowserPlugin in the embedder which takes up the full page, then it
  75   // is returned.
  76   BrowserPluginGuest* GetFullPageGuest();
  77
  78  private:
  79   explicit BrowserPluginEmbedder(WebContentsImpl* web_contents);
  80
  81   BrowserPluginGuestManager* GetBrowserPluginGuestManager() const;
  82
  83   void ClearGuestDragStateIfApplicable();
  84
  85   static bool DidSendScreenRectsCallback(WebContents* guest_web_contents);
  86
  87   // Notifies a guest that the embedder's screen info has changed.
  88   static bool NotifyScreenInfoChanged(WebContents* guest_web_contents);
  89
  90   // Closes modal dialogs in |guest_web_contents|.
  91   static bool CancelDialogs(WebContents* guest_web_contents);
  92
  93   static bool UnlockMouseIfNecessaryCallback(bool* mouse_unlocked,
  94                                              WebContents* guest);
  95
  96   // Message handlers.
  97
  98   void OnAttach(RenderFrameHost* render_frame_host,
  99                 int instance_id,
 100                 const BrowserPluginHostMsg_Attach_Params& params);
 101   void OnUpdateDragCursor(bool* handled);
 102
 103   // Used to correctly update the cursor when dragging over a guest, and to
 104   // handle a race condition when dropping onto the guest that started the drag
 105   // (the race is that the dragend message arrives before the drop message so
 106   // the drop never takes place).
 107   // crbug.com/233571
 108   base::WeakPtr<BrowserPluginGuest> guest_dragging_over_;
 109
 110   // Pointer to the guest that started the drag, used to forward necessary drag
 111   // status messages to the correct guest.
 112   base::WeakPtr<BrowserPluginGuest> guest_started_drag_;
 113
 114   // Keeps track of "dragend" state.
 115   bool guest_drag_ending_;
 116
 117   base::WeakPtrFactory<BrowserPluginEmbedder> weak_ptr_factory_;
 118
 119   DISALLOW_COPY_AND_ASSIGN(BrowserPluginEmbedder);
 120 };
 121
 122 }  // namespace content
 123
 124 #endif  // CONTENT_BROWSER_BROWSER_PLUGIN_BROWSER_PLUGIN_EMBEDDER_H_