mus: Introduce AcceleratorRegistrar and AcceleratorHandler.

mash/wm/window_manager_application.cc

 // 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.
 
 #include "mash/wm/window_manager_application.h"
 
 #include "base/bind.h"
 #include "components/mus/common/util.h"
 #include "components/mus/public/cpp/event_matcher.h"
 #include "components/mus/public/cpp/window.h"
 #include "components/mus/public/cpp/window_tree_connection.h"
 #include "components/mus/public/cpp/window_tree_host_factory.h"
+#include "mash/wm/accelerator_registrar_impl.h"
 #include "mash/wm/background_layout.h"
 #include "mash/wm/shelf_layout.h"
 #include "mash/wm/window_layout.h"
 #include "mash/wm/window_manager_impl.h"
 #include "mojo/application/public/cpp/application_connection.h"
 #include "mojo/services/tracing/public/cpp/tracing_impl.h"
 #include "ui/mojo/init/ui_init.h"
 #include "ui/views/mus/aura_init.h"
 #include "ui/views/mus/display_converter.h"
 
@@ skipping 33 matching lines @@
 }
 
 void WindowManagerApplication::AddAccelerators() {
   window_tree_host_->AddAccelerator(
       kWindowSwitchCmd,
       mus::CreateKeyMatcher(mus::mojom::KEYBOARD_CODE_TAB,
                             mus::mojom::EVENT_FLAGS_CONTROL_DOWN),
       base::Bind(&AssertTrue));
 }
 
+void WindowManagerApplication::OnAcceleratorRegistrarDestroyed(
+    AcceleratorRegistrarImpl* registrar) {
+  accelerator_registrars_.erase(registrar);
+}
+
 void WindowManagerApplication::Initialize(mojo::ApplicationImpl* app) {
   app_ = app;
   tracing_.Initialize(app);
   window_manager_.reset(new WindowManagerImpl());
   // Don't bind to the WindowManager immediately. Wait for OnEmbed() first.
   mus::mojom::WindowManagerPtr window_manager;
   requests_.push_back(new mojo::InterfaceRequest<mus::mojom::WindowManager>(
       mojo::GetProxy(&window_manager)));
   mus::mojom::WindowTreeHostClientPtr host_client;
   host_client_binding_.Bind(GetProxy(&host_client));
   mus::CreateSingleWindowTreeHost(app, host_client.Pass(), this,
                                   &window_tree_host_, window_manager.Pass(),
                                   window_manager_.get());
 }
 
 bool WindowManagerApplication::ConfigureIncomingConnection(
     mojo::ApplicationConnection* connection) {
-  connection->AddService(this);
+  connection->AddService<mus::mojom::AcceleratorRegistrar>(this);
+  connection->AddService<mus::mojom::WindowManager>(this);
   return true;
 }
 
 void WindowManagerApplication::OnAccelerator(uint32_t id,
                                              mus::mojom::EventPtr event) {
   switch (id) {
     case kWindowSwitchCmd:
       window_tree_host_->ActivateNextWindow();
       break;
     default:
-      NOTREACHED() << "Unknown accelerator command: " << id;
+      for (auto* registrar : accelerator_registrars_) {
+        if (registrar->OwnsAccelerator(id)) {
+          registrar->ProcessAccelerator(id, event.Pass());
+          break;
+        }
+      }
   }
 }
 
 void WindowManagerApplication::OnEmbed(mus::Window* root) {
   root_ = root;
   root_->AddObserver(this);
   CreateContainers();
   background_layout_.reset(new BackgroundLayout(
       GetWindowForContainer(mojom::CONTAINER_USER_BACKGROUND)));
   shelf_layout_.reset(
@@ skipping 16 matching lines @@
 }
 
 void WindowManagerApplication::OnConnectionLost(
     mus::WindowTreeConnection* connection) {
   // TODO(sky): shutdown.
   NOTIMPLEMENTED();
 }
 
 void WindowManagerApplication::Create(
     mojo::ApplicationConnection* connection,
+    mojo::InterfaceRequest<mus::mojom::AcceleratorRegistrar> request) {
+  static int accelerator_registrar_count = 0;
+  if (accelerator_registrar_count == std::numeric_limits<int>::max()) {
+    // Restart from zero if we have reached the limit. It is technically
+    // possible to end up with multiple active registrars with the same
+    // namespace, but it is highly unlikely. In the event that multiple
+    // registrars have the same namespace, this new registrar will be unable to
+    // install accelerators.
+    accelerator_registrar_count = 0;
+  }
+  accelerator_registrars_.insert(new AcceleratorRegistrarImpl(
+      window_tree_host_.get(), ++accelerator_registrar_count, request.Pass(),
+      base::Bind(&WindowManagerApplication::OnAcceleratorRegistrarDestroyed,
+                 base::Unretained(this))));
+}
+
+void WindowManagerApplication::Create(
+    mojo::ApplicationConnection* connection,
     mojo::InterfaceRequest<mus::mojom::WindowManager> request) {
   if (root_) {
     window_manager_binding_.AddBinding(window_manager_.get(), request.Pass());
   } else {
     requests_.push_back(
         new mojo::InterfaceRequest<mus::mojom::WindowManager>(request.Pass()));
   }
 }
 
 void WindowManagerApplication::OnWindowDestroyed(mus::Window* window) {
@@ skipping 13 matching lines @@
     DCHECK_EQ(mus::LoWord(window->id()), container)
         << "Containers must be created before other windows!";
     window->SetBounds(root_->bounds());
     window->SetVisible(true);
     root_->AddChild(window);
   }
 }
 
 }  // namespace wm
 }  // namespace mash