content/browser/renderer_host/render_view_host_factory.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 #ifndef CONTENT_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_FACTORY_H_
   6 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_FACTORY_H_
   7
   8 #include "base/basictypes.h"
   9 #include "content/common/content_export.h"
  10
  11 namespace content {
  12 class RenderFrameHostDelegate;
  13 class RenderViewHost;
  14 class RenderViewHostDelegate;
  15 class RenderWidgetHostDelegate;
  16 class SessionStorageNamespace;
  17 class SiteInstance;
  18
  19 // A factory for creating RenderViewHosts. There is a global factory function
  20 // that can be installed for the purposes of testing to provide a specialized
  21 // RenderViewHost class.
  22 class RenderViewHostFactory {
  23  public:
  24   // Creates a RenderViewHost using the currently registered factory, or the
  25   // default one if no factory is registered. Ownership of the returned
  26   // pointer will be passed to the caller.
  27   static RenderViewHost* Create(
  28       SiteInstance* instance,
  29       RenderViewHostDelegate* delegate,
  30       RenderWidgetHostDelegate* widget_delegate,
  31       int routing_id,
  32       int main_frame_routing_id,
  33       bool swapped_out,
  34       bool hidden);
  35
  36   // Returns true if there is currently a globally-registered factory.
  37   static bool has_factory() {
  38     return !!factory_;
  39   }
  40
  41  protected:
  42   RenderViewHostFactory() {}
  43   virtual ~RenderViewHostFactory() {}
  44
  45   // You can derive from this class and specify an implementation for this
  46   // function to create a different kind of RenderViewHost for testing.
  47   virtual RenderViewHost* CreateRenderViewHost(
  48       SiteInstance* instance,
  49       RenderViewHostDelegate* delegate,
  50       RenderWidgetHostDelegate* widget_delegate,
  51       int routing_id,
  52       int main_frame_routing_id,
  53       bool swapped_out) = 0;
  54
  55   // Registers your factory to be called when new RenderViewHosts are created.
  56   // We have only one global factory, so there must be no factory registered
  57   // before the call. This class does NOT take ownership of the pointer.
  58   CONTENT_EXPORT static void RegisterFactory(RenderViewHostFactory* factory);
  59
  60   // Unregister the previously registered factory. With no factory registered,
  61   // the default RenderViewHosts will be created.
  62   CONTENT_EXPORT static void UnregisterFactory();
  63
  64  private:
  65   // The current globally registered factory. This is NULL when we should
  66   // create the default RenderViewHosts.
  67   CONTENT_EXPORT static RenderViewHostFactory* factory_;
  68
  69   DISALLOW_COPY_AND_ASSIGN(RenderViewHostFactory);
  70 };
  71
  72 }  // namespace content
  73
  74 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_FACTORY_H_