mus: Introduce AcceleratorRegistrar and AcceleratorHandler.

mash/wm/accelerator_registrar_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 MASH_WM_ACCELERATOR_REGISTRAR_IMPL_H_
+#define MASH_WM_ACCELERATOR_REGISTRAR_IMPL_H_
+
+#include <set>
+
+#include "base/callback.h"
+#include "base/macros.h"
+#include "components/mus/public/interfaces/accelerator_registrar.mojom.h"
+#include "mojo/common/weak_binding_set.h"
+#include "mojo/public/cpp/bindings/strong_binding.h"
+
+namespace mus {
+namespace mojom {
+class WindowTreeHost;
+}
+}
+
+namespace mash {
+namespace wm {
+
+class WindowManagerApplication;
+
+// Manages AcceleratorHandlers from a particular AcceleratorRegistrar
+// connection. This manages its own lifetime, and destroys itself when the
+// AcceleratorRegistrar and all its AcceleratorHandlers are disconnected. Upon
+// destruction, it calls the DestroyCallback.
+class AcceleratorRegistrarImpl : public mus::mojom::AcceleratorRegistrar {
+ public:
+  using DestroyCallback = base::Callback<void(AcceleratorRegistrarImpl*)>;
+  AcceleratorRegistrarImpl(mus::mojom::WindowTreeHost* host,
+                           uint32_t accelerator_namespace,
+                           mojo::InterfaceRequest<AcceleratorRegistrar> request,
+                           const DestroyCallback& destroy_callback);
+
+  bool OwnsAccelerator(uint32_t accelerator_id) const;
+  void ProcessAccelerator(uint32_t accelerator_id, mus::mojom::EventPtr event);
+
+ private:
+  ~AcceleratorRegistrarImpl() override;
+
+  uint32_t ComputeAcceleratorId(uint32_t accelerator_id) const;
+  void OnBindingGone();
+  void OnHandlerGone();
+
+  // mus::mojom::AcceleratorRegistrar:
+  void SetHandler(mus::mojom::AcceleratorHandlerPtr handler) override;
+  void AddAccelerator(uint32_t accelerator_id,
+                      mus::mojom::EventMatcherPtr matcher,
+                      const AddAcceleratorCallback& callback) override;
+  void RemoveAccelerator(uint32_t accelerator_id) override;
+
+  mus::mojom::WindowTreeHost* host_;
+  mus::mojom::AcceleratorHandlerPtr accelerator_handler_;
+  mojo::Binding<AcceleratorRegistrar> binding_;
+  uint32_t accelerator_namespace_;
+  std::set<uint32_t> accelerator_ids_;
+  DestroyCallback destroy_callback_;
+
+  DISALLOW_COPY_AND_ASSIGN(AcceleratorRegistrarImpl);
+};
+
+}  // namespace wm
+}  // namespace mash
+
+#endif  // MASH_WM_ACCELERATOR_REGISTRAR_IMPL_H_