Serialize a subset of WebInputEvents to protobufs.

blimp/net/input_message_processor.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 "blimp/net/input_message_processor.h"
+
+#include "base/logging.h"
+#include "blimp/common/proto/input.pb.h"
+#include "third_party/WebKit/public/platform/WebGestureDevice.h"
+#include "third_party/WebKit/public/web/WebInputEvent.h"
+
+namespace blimp {
+namespace {
+
+scoped_ptr<blink::WebGestureEvent> BuildCommonWebGesture(
+    const InputMessage& proto,
+    blink::WebInputEvent::Type type) {
+  scoped_ptr<blink::WebGestureEvent> event(new blink::WebGestureEvent);
+  event->type = type;
+  event->timeStampSeconds = proto.timestamp_seconds();
+
+  const GestureCommon& common = proto.gesture_common();
+  event->x = common.x();
+  event->y = common.y();
+  event->globalX = common.global_x();
+  event->globalY = common.global_y();
+  event->sourceDevice = blink::WebGestureDevice::WebGestureDeviceTouchscreen;
+  return event;
+}
+
+scoped_ptr<blink::WebInputEvent> ProtoToGestureScrollBegin(
+    const InputMessage& proto) {
+  scoped_ptr<blink::WebGestureEvent> event(
+      BuildCommonWebGesture(proto,
+                            blink::WebInputEvent::Type::GestureScrollBegin));
+
+  const GestureScrollBegin& details = proto.gesture_scroll_begin();
+  event->data.scrollBegin.deltaXHint = details.delta_x_hint();
+  event->data.scrollBegin.deltaYHint = details.delta_y_hint();
+  event->data.scrollBegin.targetViewport = details.target_viewport();
+
+  return std::move(event);
+}
+
+scoped_ptr<blink::WebInputEvent> ProtoToGestureScrollEnd(
+    const InputMessage& proto) {
+  return BuildCommonWebGesture(proto,
+                               blink::WebInputEvent::Type::GestureScrollEnd);
+}
+
+scoped_ptr<blink::WebInputEvent> ProtoToGestureScrollUpdate(
+    const InputMessage& proto) {
+  scoped_ptr<blink::WebGestureEvent> event(
+        BuildCommonWebGesture(proto,
+                              blink::WebInputEvent::Type::GestureScrollUpdate));
+
+  const GestureScrollUpdate& details = proto.gesture_scroll_update();
+  event->data.scrollUpdate.deltaX = details.delta_x();
+  event->data.scrollUpdate.deltaY = details.delta_y();
+  event->data.scrollUpdate.velocityX = details.velocity_x();
+  event->data.scrollUpdate.velocityY = details.velocity_y();
+  event->data.scrollUpdate.previousUpdateInSequencePrevented =
+      details.previous_update_in_sequence_prevented();
+  event->data.scrollUpdate.preventPropagation = details.prevent_propagation();
+  event->data.scrollUpdate.inertial = details.inertial();
+
+  return std::move(event);
+}
+
+scoped_ptr<blink::WebInputEvent> ProtoToGestureFlingStart(
+    const InputMessage& proto) {
+  scoped_ptr<blink::WebGestureEvent> event(
+        BuildCommonWebGesture(proto,
+                              blink::WebInputEvent::Type::GestureFlingStart));
+
+  const GestureFlingStart& details = proto.gesture_fling_start();
+  event->data.flingStart.velocityX = details.velocity_x();
+  event->data.flingStart.velocityY = details.velocity_y();
+  event->data.flingStart.targetViewport = details.target_viewport();
+
+  return std::move(event);
+}
+
+scoped_ptr<blink::WebInputEvent> ProtoToGestureFlingCancel(
+    const InputMessage& proto) {
+  scoped_ptr<blink::WebGestureEvent> event(
+        BuildCommonWebGesture(proto,
+                              blink::WebInputEvent::Type::GestureFlingCancel));
+
+  const GestureFlingCancel& details = proto.gesture_fling_cancel();
+  event->data.flingCancel.preventBoosting = details.prevent_boosting();
+
+  return std::move(event);
+}
+
+scoped_ptr<blink::WebInputEvent> ProtoToGestureTap(
+    const InputMessage& proto) {
+  scoped_ptr<blink::WebGestureEvent> event(
+        BuildCommonWebGesture(proto,
+                              blink::WebInputEvent::Type::GestureTap));
+
+  const GestureTap& details = proto.gesture_tap();
+  event->data.tap.tapCount = details.tap_count();
+  event->data.tap.width = details.width();
+  event->data.tap.height = details.height();
+
+  return std::move(event);
+}
+
+scoped_ptr<blink::WebInputEvent> ProtoToGesturePinchBegin(
+    const InputMessage& proto) {
+  return BuildCommonWebGesture(proto,
+                               blink::WebInputEvent::Type::GesturePinchBegin);
+}
+
+scoped_ptr<blink::WebInputEvent> ProtoToGesturePinchEnd(
+    const InputMessage& proto) {
+  return BuildCommonWebGesture(proto,
+                               blink::WebInputEvent::Type::GesturePinchEnd);
+}
+
+scoped_ptr<blink::WebInputEvent> ProtoToGesturePinchUpdate(
+    const InputMessage& proto) {
+  scoped_ptr<blink::WebGestureEvent> event(
+        BuildCommonWebGesture(proto,
+                              blink::WebInputEvent::Type::GesturePinchUpdate));
+
+  const GesturePinchUpdate& details = proto.gesture_pinch_update();
+  event->data.pinchUpdate.zoomDisabled = details.zoom_disabled();
+  event->data.pinchUpdate.scale = details.scale();
+
+  return std::move(event);
+}
+
+}  // namespace
+
+InputMessageProcessor::InputMessageProcessor() {}
+
+InputMessageProcessor::~InputMessageProcessor() {}
+
+scoped_ptr<blink::WebInputEvent> InputMessageProcessor::ProcessMessage(
+    const InputMessage& message) {
+  scoped_ptr<blink::WebInputEvent> event;
+
+  switch (message.type()) {
+    case InputMessage::Type_GestureScrollBegin:
+      event = ProtoToGestureScrollBegin(message);
+      break;
+    case InputMessage::Type_GestureScrollEnd:
+      event = ProtoToGestureScrollEnd(message);
+      break;
+    case InputMessage::Type_GestureScrollUpdate:
+      event = ProtoToGestureScrollUpdate(message);
+      break;
+    case InputMessage::Type_GestureFlingStart:
+      event = ProtoToGestureFlingStart(message);
+      break;
+    case InputMessage::Type_GestureFlingCancel:
+      event = ProtoToGestureFlingCancel(message);
+      break;
+    case InputMessage::Type_GestureTap:
+      event = ProtoToGestureTap(message);
+      break;
+    case InputMessage::Type_GesturePinchBegin:
+      event = ProtoToGesturePinchBegin(message);
+      break;
+    case InputMessage::Type_GesturePinchEnd:
+      event = ProtoToGesturePinchEnd(message);
+      break;
+    case InputMessage::Type_GesturePinchUpdate:
+      event = ProtoToGesturePinchUpdate(message);
+      break;
+    case InputMessage::UNKNOWN:
+      DLOG(FATAL) << "Received an InputMessage with an unknown type.";
+      return nullptr;
+  }
+
+  return event;
+}
+
+}  // namespace blimp