Separate out event-targeting logic in EventDispatcher to EventTargeter.

services/ui/ws/event_dispatcher.h

 // Copyright 2015 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 SERVICES_UI_WS_EVENT_DISPATCHER_H_
 #define SERVICES_UI_WS_EVENT_DISPATCHER_H_
 
 #include <stdint.h>
 
 #include <map>
 #include <memory>
 #include <utility>
 
 #include "base/macros.h"
 #include "services/ui/common/types.h"
 #include "services/ui/public/interfaces/cursor/cursor.mojom.h"
 #include "services/ui/public/interfaces/window_manager.mojom.h"
 #include "services/ui/ws/drag_cursor_updater.h"
+#include "services/ui/ws/event_targeter.h"
 #include "services/ui/ws/modal_window_controller.h"
 #include "services/ui/ws/server_window_observer.h"
 #include "ui/gfx/geometry/rect_f.h"
 
 namespace ui {
 class Event;
 class KeyEvent;
 class LocatedEvent;
 class PointerEvent;
 
 namespace ws {
 
 class Accelerator;
-struct DeepestWindow;
 class DragController;
 class DragSource;
 class DragTargetConnection;
 class EventDispatcherDelegate;
 class ServerWindow;
 
 namespace test {
 class EventDispatcherTestApi;
 }
 
@@ skipping 97 matching lines @@
   // Processes the supplied event, informing the delegate as approriate. This
   // may result in generating any number of events. If |match_phase| is
   // ANY and there is a matching accelerator with PRE_TARGET found, than only
   // OnAccelerator() is called. The expectation is after the PRE_TARGET has been
   // handled this is again called with an AcceleratorMatchPhase of POST_ONLY.
   void ProcessEvent(const ui::Event& event, AcceleratorMatchPhase match_phase);
 
  private:
   friend class test::EventDispatcherTestApi;
 
-  // Keeps track of state associated with an active pointer.
-  struct PointerTarget {
-    PointerTarget()
-        : window(nullptr),
-          is_mouse_event(false),
-          in_nonclient_area(false),
-          is_pointer_down(false) {}
-
-    // The target window, which may be null. null is used in two situations:
-    // when there is no valid window target, or there was a target but the
-    // window is destroyed before a corresponding release/cancel.
-    ServerWindow* window;
-
-    bool is_mouse_event;
-
-    // Did the pointer event start in the non-client area.
-    bool in_nonclient_area;
-
-    bool is_pointer_down;
-  };
-
   void SetMouseCursorSourceWindow(ServerWindow* window);
 
   void ProcessKeyEvent(const ui::KeyEvent& event,
                        AcceleratorMatchPhase match_phase);
 
   bool IsTrackingPointer(int32_t pointer_id) const {
     return pointer_targets_.count(pointer_id) > 0;
   }
 
   // EventDispatcher provides the following logic for pointer events:
@@ skipping 13 matching lines @@
 
   // Removes a PointerTarget from |pointer_targets_|.
   void StopTrackingPointer(int32_t pointer_id);
 
   // Starts tracking the pointer for |event|, or if already tracking the
   // pointer sends the appropriate event to the delegate and updates the
   // currently tracked PointerTarget appropriately.
   void UpdateTargetForPointer(int32_t pointer_id,
                               const ui::LocatedEvent& event);
 
-  // Returns a PointerTarget for the supplied event. If there is no valid
-  // event target for the specified location |window| in the returned value is
-  // null.
-  PointerTarget PointerTargetForEvent(const ui::LocatedEvent& event);
-
   // Returns true if any pointers are in the pressed/down state.
   bool AreAnyPointersDown() const;
 
   // If |target->window| is valid, then passes the event to the delegate.
   void DispatchToPointerTarget(const PointerTarget& target,
                                const ui::LocatedEvent& event);
 
   // Dispatch |event| to the delegate.
   void DispatchToClient(ServerWindow* window,
                         ClientSpecificId client_id,
                         const ui::LocatedEvent& event);
 
   // Stops sending pointer events to |window|. This does not remove the entry
   // for |window| from |pointer_targets_|, rather it nulls out the window. This
   // way we continue to eat events until the up/cancel is received.
   void CancelPointerEventsToTarget(ServerWindow* window);
 
   // Used to observe a window. Can be called multiple times on a window. To
   // unobserve a window, UnobserveWindow() should be called the same number of
   // times.
   void ObserveWindow(ServerWindow* winodw);
   void UnobserveWindow(ServerWindow* winodw);
 
   // Returns an Accelerator bound to the specified code/flags, and of the
   // matching |phase|. Otherwise returns null.
   Accelerator* FindAccelerator(const ui::KeyEvent& event,
                                const ui::mojom::AcceleratorPhase phase);
 
-  DeepestWindow FindDeepestVisibleWindowForEvents(const gfx::Point& location);
-
   // Clears the implicit captures in |pointer_targets_|, with the exception of
   // |window|. |window| may be null. |client_id| is the target client of
   // |window|.
   void CancelImplicitCaptureExcept(ServerWindow* window,
                                    ClientSpecificId client_id);
 
   // ServerWindowObserver:
   void OnWillChangeWindowHierarchy(ServerWindow* window,
                                    ServerWindow* new_parent,
                                    ServerWindow* old_parent) override;
   void OnWindowVisibilityChanged(ServerWindow* window) override;
   void OnWindowDestroyed(ServerWindow* window) override;
 
   // DragCursorUpdater:
   void OnDragCursorUpdated() override;
 
   EventDispatcherDelegate* delegate_;
 
   ServerWindow* capture_window_;
   ClientSpecificId capture_window_client_id_;
 
   std::unique_ptr<DragController> drag_controller_;
 
   ModalWindowController modal_window_controller_;
 
+  std::unique_ptr<EventTargeter> event_targeter_;
+
   bool mouse_button_down_;
   ServerWindow* mouse_cursor_source_window_;
   bool mouse_cursor_in_non_client_area_;
 
   // The on screen location of the mouse pointer. This can be outside the
   // bounds of |mouse_cursor_source_window_|, which can capture the cursor.
   gfx::Point mouse_pointer_last_location_;
 
   std::map<uint32_t, std::unique_ptr<Accelerator>> accelerators_;
 
@@ skipping 13 matching lines @@
       AcceleratorMatchPhase::ANY;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(EventDispatcher);
 };
 
 }  // namespace ws
 }  // namespace ui
 
 #endif  // SERVICES_UI_WS_EVENT_DISPATCHER_H_