mustash: Implement basic input event routing in renderer

content/renderer/compositor_mus_connection.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 "content/renderer/compositor_mus_connection.h"
+
+#include "base/single_thread_task_runner.h"
+#include "content/common/input/web_input_event_traits.h"
+#include "content/renderer/input/input_handler_manager.h"
+#include "content/renderer/render_widget_mus_connection.h"
+#include "mojo/converters/blink/blink_input_events_type_converters.h"
+#include "ui/events/latency_info.h"
+
+namespace content {
+
+CompositorMusConnection::CompositorMusConnection(
+    int routing_id,
+    const scoped_refptr<base::SingleThreadTaskRunner>& main_task_runner,
+    const scoped_refptr<base::SingleThreadTaskRunner>& compositor_task_runner,
+    mojo::InterfaceRequest<mus::mojom::WindowTreeClient> request,
+    InputHandlerManager* input_handler_manager)
+    : routing_id_(routing_id),
+      root_(nullptr),
+      main_task_runner_(main_task_runner),
+      compositor_task_runner_(compositor_task_runner),
+      input_handler_manager_(input_handler_manager) {
+  DCHECK(main_task_runner_->BelongsToCurrentThread());
+  compositor_task_runner_->PostTask(
+      FROM_HERE, base::Bind(&CompositorMusConnection::
+                                CreateWindowTreeConnectionOnCompositorThread,
+                            this, base::Passed(std::move(request))));
+}
+
+void CompositorMusConnection::AttachSurfaceOnMainThread(
+    scoped_ptr<mus::WindowSurfaceBinding> surface_binding) {
+  DCHECK(main_task_runner_->BelongsToCurrentThread());
+  compositor_task_runner_->PostTask(
+      FROM_HERE,
+      base::Bind(&CompositorMusConnection::AttachSurfaceOnCompositorThread,
+                 this, base::Passed(std::move(surface_binding))));
+}
+
+CompositorMusConnection::~CompositorMusConnection() {}
+
+void CompositorMusConnection::AttachSurfaceOnCompositorThread(
+    scoped_ptr<mus::WindowSurfaceBinding> surface_binding) {
+  DCHECK(compositor_task_runner_->BelongsToCurrentThread());
+  window_surface_binding_ = std::move(surface_binding);
+  if (root_) {
+    root_->AttachSurface(mus::mojom::SURFACE_TYPE_DEFAULT,
+                         std::move(window_surface_binding_));
+  }
+}
+
+void CompositorMusConnection::CreateWindowTreeConnectionOnCompositorThread(
+    mojo::InterfaceRequest<mus::mojom::WindowTreeClient> request) {
+  DCHECK(compositor_task_runner_->BelongsToCurrentThread());
+  mus::WindowTreeConnection::Create(
+      this, std::move(request),
+      mus::WindowTreeConnection::CreateType::DONT_WAIT_FOR_EMBED);
+}
+
+void CompositorMusConnection::OnConnectionLostOnMainThread() {
+  DCHECK(main_task_runner_->BelongsToCurrentThread());
+  RenderWidgetMusConnection* connection =
+      RenderWidgetMusConnection::Get(routing_id_);
+  if (!connection)
+    return;
+  connection->OnConnectionLost();
+}
+
+void CompositorMusConnection::OnWindowInputEventOnMainThread(
+    scoped_ptr<blink::WebInputEvent> web_event,
+    const base::Closure& ack) {
+  DCHECK(main_task_runner_->BelongsToCurrentThread());
+  RenderWidgetMusConnection* connection =
+      RenderWidgetMusConnection::Get(routing_id_);
+  if (!connection) {
+    ack.Run();
+    return;
+  }
+  connection->OnWindowInputEvent(std::move(web_event), ack);
+}
+
+void CompositorMusConnection::OnWindowInputEventAckOnMainThread(
+    const base::Closure& ack) {
+  DCHECK(main_task_runner_->BelongsToCurrentThread());
+  compositor_task_runner_->PostTask(FROM_HERE, ack);
+}
+
+void CompositorMusConnection::OnConnectionLost(
+    mus::WindowTreeConnection* connection) {
+  DCHECK(compositor_task_runner_->BelongsToCurrentThread());
+  main_task_runner_->PostTask(
+      FROM_HERE,
+      base::Bind(&CompositorMusConnection::OnConnectionLostOnMainThread, this));
+}
+
+void CompositorMusConnection::OnEmbed(mus::Window* root) {
+  DCHECK(compositor_task_runner_->BelongsToCurrentThread());
+  root_ = root;
+  root_->AddObserver(this);
+  if (window_surface_binding_) {
+    root->AttachSurface(mus::mojom::SURFACE_TYPE_DEFAULT,
+                        std::move(window_surface_binding_));
+  }
+}
+
+void CompositorMusConnection::OnWindowInputEvent(
+    mus::Window* window,
+    const mus::mojom::EventPtr& event) {
+  DCHECK(compositor_task_runner_->BelongsToCurrentThread());
+  scoped_ptr<blink::WebInputEvent> web_event =
+      event.To<scoped_ptr<blink::WebInputEvent>>();
+  // TODO(sad): We probably need to plumb LatencyInfo through Mus.
+  ui::LatencyInfo info;
+  InputEventAckState ack_state = input_handler_manager_->HandleInputEvent(
+      routing_id_, web_event.get(), &info);
+  if (ack_state != INPUT_EVENT_ACK_STATE_NOT_CONSUMED)
+    return;
+  // TODO(sad): Do something more useful once we can do async acks.
+  base::Closure ack = base::Bind(&base::DoNothing);
+  const bool send_ack =
+      WebInputEventTraits::WillReceiveAckFromRenderer(*web_event);
+  if (send_ack) {
+    // Ultimately, this ACK needs to go back to the Mus client lib which is not
+    // thread-safe and lives on the compositor thread. For ACKs that are passed
+    // to the main thread we pass them back to the compositor thread via
+    // OnWindowInputEventAckOnMainThread.
+    ack = base::Bind(
+        &CompositorMusConnection::OnWindowInputEventAckOnMainThread, this, ack);
+  }
+  main_task_runner_->PostTask(
+      FROM_HERE,
+      base::Bind(&CompositorMusConnection::OnWindowInputEventOnMainThread, this,
+                 base::Passed(std::move(web_event)), ack));
+}
+
+}  // namespace content