content/browser/renderer_host/render_widget_host_input_event_router.h

   1 // Copyright 2015 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_WIDGET_HOST_INPUT_EVENT_ROUTER_H_
   6 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_INPUT_EVENT_ROUTER_H_
   7
   8 #include <stdint.h>
   9
  10 #include "base/containers/hash_tables.h"
  11 #include "content/common/content_export.h"
  12
  13 namespace blink {
  14 class WebMouseEvent;
  15 class WebMouseWheelEvent;
  16 }
  17
  18 namespace gfx {
  19 class Point;
  20 }
  21
  22 namespace content {
  23
  24 class RenderWidgetHostViewBase;
  25
  26 // Class owned by WebContentsImpl for the purpose of directing input events
  27 // to the correct RenderWidgetHost on pages with multiple RenderWidgetHosts.
  28 // It maintains a mapping of RenderWidgetHostViews to Surface IDs that they
  29 // own. When an input event requires routing based on window coordinates,
  30 // this class requests a Surface hit test from the provided |root_view| and
  31 // forwards the event to the owning RWHV of the returned Surface ID.
  32 class CONTENT_EXPORT RenderWidgetHostInputEventRouter {
  33  public:
  34   RenderWidgetHostInputEventRouter();
  35   ~RenderWidgetHostInputEventRouter();
  36
  37   void RouteMouseEvent(RenderWidgetHostViewBase* root_view,
  38                        blink::WebMouseEvent* event);
  39   void RouteMouseWheelEvent(RenderWidgetHostViewBase* root_view,
  40                             blink::WebMouseWheelEvent* event);
  41
  42   void AddSurfaceIdNamespaceOwner(uint32_t id, RenderWidgetHostViewBase* owner);
  43   void RemoveSurfaceIdNamespaceOwner(uint32_t id);
  44
  45  private:
  46   RenderWidgetHostViewBase* FindEventTarget(RenderWidgetHostViewBase* root_view,
  47                                             const gfx::Point& point,
  48                                             gfx::Point* transformed_point);
  49
  50   typedef base::hash_map<uint32_t, RenderWidgetHostViewBase*>
  51       SurfaceIdNamespaceOwnerMap;
  52   SurfaceIdNamespaceOwnerMap owner_map_;
  53
  54   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostInputEventRouter);
  55 };
  56
  57 }  // namespace content
  58
  59 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_INPUT_EVENT_ROUTER_H_