content/browser/renderer_host/render_widget_host_input_event_router.cc

   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 #include "content/browser/renderer_host/render_widget_host_input_event_router.h"
   6
   7 #include "cc/surfaces/surface_manager.h"
   8 #include "content/browser/renderer_host/render_widget_host_view_base.h"
   9 #include "third_party/WebKit/public/web/WebInputEvent.h"
  10
  11 namespace content {
  12
  13 RenderWidgetHostInputEventRouter::RenderWidgetHostInputEventRouter() {}
  14
  15 RenderWidgetHostInputEventRouter::~RenderWidgetHostInputEventRouter() {
  16   owner_map_.clear();
  17 }
  18
  19 RenderWidgetHostViewBase* RenderWidgetHostInputEventRouter::FindEventTarget(
  20     RenderWidgetHostViewBase* root_view,
  21     const gfx::Point& point,
  22     gfx::Point* transformed_point) {
  23   // Short circuit if owner_map has only one RenderWidgetHostView, no need for
  24   // hit testing.
  25   if (owner_map_.size() <= 1) {
  26     *transformed_point = point;
  27     return root_view;
  28   }
  29
  30   // The conversion of point to transform_point is done over the course of the
  31   // hit testing, and reflect transformations that would normally be applied in
  32   // the renderer process if the event was being routed between frames within a
  33   // single process with only one RenderWidgetHost.
  34   uint32_t surface_id_namespace =
  35       root_view->SurfaceIdNamespaceAtPoint(point, transformed_point);
  36   const SurfaceIdNamespaceOwnerMap::iterator iter =
  37       owner_map_.find(surface_id_namespace);
  38   // If the point hit a Surface whose namspace is no longer in the map, then
  39   // it likely means the RenderWidgetHostView has been destroyed but its
  40   // parent frame has not sent a new compositor frame since that happened.
  41   if (iter == owner_map_.end())
  42     return root_view;
  43   return iter->second;
  44 }
  45
  46 void RenderWidgetHostInputEventRouter::RouteMouseEvent(
  47     RenderWidgetHostViewBase* root_view,
  48     blink::WebMouseEvent* event) {
  49   gfx::Point transformed_point;
  50   RenderWidgetHostViewBase* target = FindEventTarget(
  51       root_view, gfx::Point(event->x, event->y), &transformed_point);
  52   event->x = transformed_point.x();
  53   event->y = transformed_point.y();
  54
  55   target->ProcessMouseEvent(*event);
  56 }
  57
  58 void RenderWidgetHostInputEventRouter::RouteMouseWheelEvent(
  59     RenderWidgetHostViewBase* root_view,
  60     blink::WebMouseWheelEvent* event) {
  61   gfx::Point transformed_point;
  62   RenderWidgetHostViewBase* target = FindEventTarget(
  63       root_view, gfx::Point(event->x, event->y), &transformed_point);
  64   event->x = transformed_point.x();
  65   event->y = transformed_point.y();
  66
  67   target->ProcessMouseWheelEvent(*event);
  68 }
  69
  70 void RenderWidgetHostInputEventRouter::AddSurfaceIdNamespaceOwner(
  71     uint32_t id,
  72     RenderWidgetHostViewBase* owner) {
  73   DCHECK(owner_map_.find(id) == owner_map_.end());
  74   owner_map_.insert(std::make_pair(id, owner));
  75 }
  76
  77 void RenderWidgetHostInputEventRouter::RemoveSurfaceIdNamespaceOwner(
  78     uint32_t id) {
  79   owner_map_.erase(id);
  80 }
  81
  82 }  // namespace content