Mozart: Implement basic input event dispatch with hit testing.

services/ui/input_manager/input_dispatcher_impl.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 SERVICES_UI_INPUT_MANAGER_INPUT_DISPATCHER_IMPL_H_
+#define SERVICES_UI_INPUT_MANAGER_INPUT_DISPATCHER_IMPL_H_
+
+#include <queue>
+
+#include "base/macros.h"
+#include "base/memory/weak_ptr.h"
+#include "mojo/public/cpp/bindings/binding.h"
+#include "mojo/public/cpp/bindings/interface_request.h"
+#include "mojo/services/geometry/interfaces/geometry.mojom.h"
+#include "mojo/services/ui/input/interfaces/input_dispatcher.mojom.h"
+#include "mojo/services/ui/views/interfaces/view_trees.mojom.h"
+#include "mojo/ui/associates/view_tree_hit_tester_client.h"
+
+namespace input_manager {
+
+class InputAssociate;
+
+// InputDispatcher implementation.
+// Binds incoming requests to the relevant view token.
+class InputDispatcherImpl : public mojo::ui::InputDispatcher {
+ public:
+  InputDispatcherImpl(
+      InputAssociate* associate,
+      mojo::ui::ViewTreeTokenPtr view_tree_token,
+      mojo::InterfaceRequest<mojo::ui::InputDispatcher> request);
+  ~InputDispatcherImpl() override;
+
+  const mojo::ui::ViewTreeToken* view_tree_token() const {
+    return view_tree_token_.get();
+  }
+
+  // |mojo::ui::InputDispatcher|
+  void DispatchEvent(mojo::EventPtr event) override;
+
+ private:
+  void ProcessNextEvent();
+  void DeliverEvent(mojo::EventPtr event);
+  void OnHitTestResult(scoped_ptr<mojo::ui::ResolvedHits> resolved_hits);
+
+  InputAssociate* const associate_;
+  mojo::ui::ViewTreeTokenPtr view_tree_token_;
+  scoped_refptr<mojo::ui::ViewTreeHitTesterClient> hit_tester_;
+
+  // TODO(jeffbrown): Replace this with a proper pipeline.
+  std::queue<mojo::EventPtr> pending_events_;
+
+  // TODO(jeffbrown): This hack is just for scaffolding.  Redesign later.
+  mojo::ui::ViewTokenPtr focused_view_token_;
+  mojo::TransformPtr focused_view_transform_;
+
+  mojo::Binding<mojo::ui::InputDispatcher> binding_;
+
+  base::WeakPtrFactory<InputDispatcherImpl> weak_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(InputDispatcherImpl);
+};
+
+}  // namespace input_manager
+
+#endif  // SERVICES_UI_INPUT_MANAGER_INPUT_DISPATCHER_IMPL_H_