Moves EventDispatcher from Display to WindowManagerState

components/mus/ws/window_manager_state.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 COMPONENTS_MUS_WS_WINDOW_MANAGER_STATE_H_
 #define COMPONENTS_MUS_WS_WINDOW_MANAGER_STATE_H_
 
 #include <stdint.h>
 
 #include "base/memory/scoped_ptr.h"
+#include "base/timer/timer.h"
 #include "components/mus/public/interfaces/display.mojom.h"
+#include "components/mus/ws/connection_manager.h"
+#include "components/mus/ws/event_dispatcher.h"
+#include "components/mus/ws/event_dispatcher_delegate.h"
 #include "components/mus/ws/user_id.h"
 
+namespace cc {
+struct SurfaceId;
+}
+
 namespace mus {
 namespace ws {
 
 class Display;
+class PlatformDisplay;
 class ServerWindow;
 class WindowTree;
 
+namespace test {
+class WindowManagerStateTestApi;
+}
+
 // Manages the state associated with a connection to a WindowManager for
 // a specific user.
-class WindowManagerState {
+class WindowManagerState : public EventDispatcherDelegate {
  public:
   // Creates a WindowManagerState that can host content from any user.
-  explicit WindowManagerState(Display* display);
-  WindowManagerState(Display* display, const UserId& user_id);
-  ~WindowManagerState();
+  WindowManagerState(Display* display,
+                     PlatformDisplay* platform_display,
+                     cc::SurfaceId surface_id);
+  WindowManagerState(Display* display,
+                     PlatformDisplay* platform_display,
+                     cc::SurfaceId surface_id,
+                     const UserId& user_id);
+  ~WindowManagerState() override;
 
   bool is_user_id_valid() const { return is_user_id_valid_; }
 
+  const UserId& user_id() const { return user_id_; }
+
   ServerWindow* root() { return root_.get(); }
   const ServerWindow* root() const { return root_.get(); }
 
   WindowTree* tree() { return tree_; }
   const WindowTree* tree() const { return tree_; }
 
   Display* display() { return display_; }
   const Display* display() const { return display_; }
 
   void SetFrameDecorationValues(mojom::FrameDecorationValuesPtr values);
   const mojom::FrameDecorationValues& frame_decoration_values() const {
     return *frame_decoration_values_;
   }
   bool got_frame_decoration_values() const {
     return got_frame_decoration_values_;
   }
 
+  void SetCapture(ServerWindow* window, bool in_nonclient_area);
+  ServerWindow* capture_window() { return event_dispatcher_.capture_window(); }
+  const ServerWindow* capture_window() const {
+    return event_dispatcher_.capture_window();
+  }
+
+  // Returns true if this is the WindowManager of the active user.
+  bool IsActive() const;
+
+  // TODO(sky): EventDispatcher is really an implementation detail and should
+  // not be exposed.
+  EventDispatcher* event_dispatcher() { return &event_dispatcher_; }
+
+  // Processes an event from PlatformDisplay.
+  void ProcessEvent(const ui::Event& event);
+
+  // Called when the ack from an event dispatched to a WindowTree is received.
+  // TODO(sky): make this private and use a callback.
+  void OnEventAck(mojom::WindowTree* tree);
+
   // Returns a mojom::Display for the specified display. WindowManager specific
   // values are not set.
   mojom::DisplayPtr ToMojomDisplay() const;
 
+  void OnWillDestroyTree(WindowTree* tree);
+
  private:
+  class ProcessedEventTarget;
   friend class Display;
+  friend class test::WindowManagerStateTestApi;
 
-  WindowManagerState(Display* display, bool is_user_id_valid,
+  // There are two types of events that may be queued, both occur only when
+  // waiting for an ack from a client.
+  // . We get an event from the PlatformDisplay. This results in |event| being
+  //   set, but |processed_target| is null.
+  // . We get an event from the EventDispatcher. In this case both |event| and
+  //   |processed_target| are valid.
+  // The second case happens if EventDispatcher generates more than one event
+  // at a time.
+  struct QueuedEvent {
+    QueuedEvent();
+    ~QueuedEvent();
+
+    scoped_ptr<ui::Event> event;
+    scoped_ptr<ProcessedEventTarget> processed_target;
+  };
+
+  WindowManagerState(Display* display,
+                     PlatformDisplay* platform_display,
+                     cc::SurfaceId surface_id,
+                     bool is_user_id_valid,
                      const UserId& user_id);
 
+  ConnectionManager* connection_manager();
+
+  void OnEventAckTimeout();
+
+  // Schedules an event to be processed later.
+  void QueueEvent(const ui::Event& event,
+                  scoped_ptr<ProcessedEventTarget> processed_event_target);
+
+  // Processes the next valid event in |event_queue_|. If the event has already
+  // been processed it is dispatched, otherwise the event is passed to the
+  // EventDispatcher for processing.
+  void ProcessNextEventFromQueue();
+
+  // Dispatches the event to the appropriate client and starts the ack timer.
+  void DispatchInputEventToWindowImpl(ServerWindow* target,
+                                      bool in_nonclient_area,
+                                      const ui::Event& event);
+
+  // EventDispatcherDelegate:
+  void OnAccelerator(uint32_t accelerator_id, const ui::Event& event) override;
+  void SetFocusedWindowFromEventDispatcher(ServerWindow* window) override;
+  ServerWindow* GetFocusedWindowForEventDispatcher() override;
+  void SetNativeCapture() override;
+  void ReleaseNativeCapture() override;
+  void OnServerWindowCaptureLost(ServerWindow* window) override;
+  void DispatchInputEventToWindow(ServerWindow* target,
+                                  bool in_nonclient_area,
+                                  const ui::Event& event) override;
+
   Display* display_;
+  PlatformDisplay* platform_display_;
   // If this was created implicitly by a call
   // WindowTreeHostFactory::CreateWindowTreeHost(), then |is_user_id_valid_|
   // is false.
   const bool is_user_id_valid_;
   const UserId user_id_;
+  // Root ServerWindow of this WindowManagerState. |root_| has a parent, the
+  // root ServerWindow of the Display.
   scoped_ptr<ServerWindow> root_;
   WindowTree* tree_ = nullptr;
 
   // Set to true the first time SetFrameDecorationValues() is received.
   bool got_frame_decoration_values_ = false;
   mojom::FrameDecorationValuesPtr frame_decoration_values_;
 
+  mojom::WindowTree* tree_awaiting_input_ack_ = nullptr;
+  std::queue<scoped_ptr<QueuedEvent>> event_queue_;
+  base::OneShotTimer event_ack_timer_;
+
+  EventDispatcher event_dispatcher_;
+
   DISALLOW_COPY_AND_ASSIGN(WindowManagerState);
 };
 
 }  // namespace ws
 }  // namespace mus
 
 #endif  // COMPONENTS_MUS_WS_WINDOW_MANAGER_STATE_H_