VR: Route hover and click events to UI elements.

chrome/browser/android/vr_shell/vr_shell_gl.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_ANDROID_VR_SHELL_VR_SHELL_GL_H_
 #define CHROME_BROWSER_ANDROID_VR_SHELL_VR_SHELL_GL_H_
 
 #include <memory>
 #include <queue>
 #include <utility>
@@ skipping 116 matching lines @@
   void DrawCursor(const vr::Mat4f& render_matrix);
   void DrawController(const vr::Mat4f& view_proj_matrix);
   bool ShouldDrawWebVr();
   void DrawWebVr();
   bool WebVrPoseByteIsValid(int pose_index_byte);
 
   void UpdateController();
   void HandleControllerInput(const gfx::Vector3dF& forward_vector);
   void HandleControllerAppButtonActivity(
       const gfx::Vector3dF& controller_direction);
-  void SendEventsToTarget(InputTarget input_target, int pixel_x, int pixel_y);
-  void SendGesture(InputTarget input_target,
-                   std::unique_ptr<blink::WebInputEvent> event);
+  void SendInputToContent(InputTarget input_target, int pixel_x, int pixel_y);
+  void SendInputToUiElements(UiElement* target_element);
+  void SendGestureToContent(std::unique_ptr<blink::WebInputEvent> event);
   void CreateUiSurface();
   void OnContentFrameAvailable();
   void OnWebVRFrameAvailable();
   bool GetPixelEncodedFrameIndex(uint16_t* frame_index);
 
   void OnVSync();
 
   // VRVSyncProvider
   void GetVSync(const GetVSyncCallback& callback) override;
 
@@ skipping 33 matching lines @@
   // Intended render_size_primary_ for use by VrShell, so that it
   // can be restored after exiting WebVR mode.
   gfx::Size render_size_vrshell_;
 
   std::unique_ptr<VrShellRenderer> vr_shell_renderer_;
 
   bool touch_pending_ = false;
   vr::Quatf controller_quat_;
 
   gfx::Point3F target_point_;
-  const UiElement* target_element_ = nullptr;
+
+  // Input targeting for non-content elements.
+  UiElement* target_element_ = nullptr;
+  UiElement* previous_target_element_ = nullptr;
+  UiElement* click_target_element_ = nullptr;
+
+  // Input targeting for the content element.
   InputTarget current_input_target_ = InputTarget::NONE;
   InputTarget current_scroll_target_ = InputTarget::NONE;
   InputTarget current_fling_target_ = InputTarget::NONE;
+
   int content_tex_css_width_ = 0;
   int content_tex_css_height_ = 0;
   gfx::Size content_tex_physical_size_ = {0, 0};
   gfx::Size webvr_surface_size_ = {0, 0};
 
   std::vector<vr::Mat4f> webvr_head_pose_;
   bool web_vr_mode_;
   bool ready_to_draw_ = false;
   bool surfaceless_rendering_;
 
@@ skipping 26 matching lines @@
   std::unique_ptr<FPSMeter> fps_meter_;
 
   base::WeakPtrFactory<VrShellGl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(VrShellGl);
 };
 
 }  // namespace vr_shell
 
 #endif  // CHROME_BROWSER_ANDROID_VR_SHELL_VR_SHELL_GL_H_