mus Window Server: implement event capture

components/mus/ws/window_tree_host_impl.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 COMPONENTS_MUS_WS_WINDOW_TREE_HOST_IMPL_H_
 #define COMPONENTS_MUS_WS_WINDOW_TREE_HOST_IMPL_H_
 
 #include <stdint.h>
 
 #include <queue>
@@ skipping 77 matching lines @@
   const mojom::ViewportMetrics& GetViewportMetrics() const;
 
   mojom::Rotation GetRotation() const;
 
   ConnectionManager* connection_manager() { return connection_manager_; }
 
   // Returns the root ServerWindow of this viewport.
   ServerWindow* root_window() { return root_.get(); }
   const ServerWindow* root_window() const { return root_.get(); }
 
+  void SetCapture(ServerWindow* window, bool in_nonclient_area);
+  void ReleaseCapture(ServerWindow* window);
+
   void SetFocusedWindow(ServerWindow* window);
   ServerWindow* GetFocusedWindow();
   void DestroyFocusController();
 
   void UpdateTextInputState(ServerWindow* window,
                             const ui::TextInputState& state);
   void SetImeVisibility(ServerWindow* window, bool visible);
 
+  // Returns the window that has captured input.
+  ServerWindow* GetCaptureWindow() {
+    return event_dispatcher_.capture_window();
+  }
+  const ServerWindow* GetCaptureWindow() const {
+    return event_dispatcher_.capture_window();
+  }
+
   // Called just before |tree| is destroyed after its connection encounters an
   // error.
   void OnWindowTreeConnectionError(WindowTreeImpl* tree);
 
   // Called when a client updates a cursor. This will update the cursor on the
   // native display if the cursor is currently under |window|.
   void OnCursorUpdated(ServerWindow* window);
 
   // Called when the window tree when stacking and bounds of a window
   // change. This may update the cursor if the ServerWindow under the last
@@ skipping 58 matching lines @@
   // Dispatches the event to the appropriate client and starts the ack timer.
   void DispatchInputEventToWindowImpl(ServerWindow* target,
                                       bool in_nonclient_area,
                                       mojom::EventPtr event);
 
   void UpdateNativeCursor(int32_t cursor_id);
 
   // DisplayManagerDelegate:
   ServerWindow* GetRootWindow() override;
   void OnEvent(const ui::Event& event) override;
+  void OnLostCapture() override;
   void OnDisplayClosed() override;
   void OnViewportMetricsChanged(
       const mojom::ViewportMetrics& old_metrics,
       const mojom::ViewportMetrics& new_metrics) override;
   void OnTopLevelSurfaceChanged(cc::SurfaceId surface_id) override;
   void OnCompositorFrameDrawn() override;
 
   // FocusControllerDelegate:
   bool CanHaveActiveChildren(ServerWindow* window) const override;
 
   // FocusControllerObserver:
   void OnActivationChanged(ServerWindow* old_active_window,
                            ServerWindow* new_active_window) override;
   void OnFocusChanged(FocusControllerChangeSource change_source,
                       ServerWindow* old_focused_window,
                       ServerWindow* new_focused_window) override;
 
   // EventDispatcherDelegate:
   void OnAccelerator(uint32_t accelerator_id, mojom::EventPtr event) override;
   void SetFocusedWindowFromEventDispatcher(ServerWindow* window) override;
   ServerWindow* GetFocusedWindowForEventDispatcher() override;
+  void OnLostCapture(ServerWindow* window) override;
   void DispatchInputEventToWindow(ServerWindow* target,
                                   bool in_nonclient_area,
                                   mojom::EventPtr event) override;
 
   // ServerWindowObserver:
   void OnWindowDestroyed(ServerWindow* window) override;
 
   const uint32_t id_;
   WindowTreeHostDelegate* delegate_;
   ConnectionManager* const connection_manager_;
@@ skipping 18 matching lines @@
 
   mojom::FrameDecorationValuesPtr frame_decoration_values_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowTreeHostImpl);
 };
 
 }  // namespace ws
 }  // namespace mus
 
 #endif  // COMPONENTS_MUS_WS_WINDOW_TREE_HOST_IMPL_H_