SyntheticGestureTarget implementation for injecting synthetic input events

content/browser/renderer_host/input/synthetic_gesture_target_base.cc

+// Copyright 2013 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/browser/renderer_host/input/synthetic_gesture_target_base.h"
+
+#include "content/browser/renderer_host/render_widget_host_impl.h"
+#include "content/browser/renderer_host/ui_events_helper.h"
+#include "content/common/input/input_event.h"
+#include "content/public/browser/render_widget_host_view.h"
+#include "ui/events/event.h"
+#include "ui/events/latency_info.h"
+
+using WebKit::WebInputEvent;
+using WebKit::WebTouchEvent;
+using WebKit::WebMouseEvent;
+using WebKit::WebMouseWheelEvent;
+
+namespace content {
+
+namespace {
+
+// How many milliseconds apart synthetic scroll messages should be sent.
+const int kSyntheticGestureMessageIntervalMs = 16;
+
+}  // namespace
+
+SyntheticGestureTargetBase::SyntheticGestureTargetBase(
+    RenderWidgetHostView* render_view)
+    : render_view_(render_view) {
+}
+
+void SyntheticGestureTargetBase::QueueInputEventToPlatform(
+    const InputEvent& event) {
+  const WebInputEvent* web_event = event.web_event.get();
+  if (WebInputEvent::isTouchEventType(web_event->type)) {
+    DCHECK(SupportsSyntheticGestureSourceType(
+            SyntheticGestureParams::TOUCH_INPUT));
+
+    const WebTouchEvent* web_touch =
+        static_cast<const WebTouchEvent*>(web_event);
+    QueueWebTouchEventToPlatform(*web_touch, event.latency_info);
+  } else if (web_event->type == WebInputEvent::MouseWheel) {
+    DCHECK(SupportsSyntheticGestureSourceType(
+            SyntheticGestureParams::MOUSE_INPUT));
+
+    const WebMouseWheelEvent* web_wheel =
+        static_cast<const WebMouseWheelEvent*>(web_event);
+    QueueWebMouseWheelEventToPlatform(*web_wheel, event.latency_info);
+  } else if (WebInputEvent::isMouseEventType(web_event->type)) {
+    DCHECK(SupportsSyntheticGestureSourceType(
+            SyntheticGestureParams::MOUSE_INPUT));
+
+    const WebMouseEvent* web_mouse =
+        static_cast<const WebMouseEvent*>(web_event);
+    QueueWebMouseEventToPlatform(*web_mouse, event.latency_info);
+  } else
+    NOTREACHED();
+}
+
+void SyntheticGestureTargetBase::QueueWebTouchEventToPlatform(

[aelias_OOO_until_Jul13, 2013/10/31 01:47:48]

Are these default implementations ever going to be used in practice?  Can we
make these abstract methods and then have NOTREACHED in the Android
implementations of the mouse events instead?

[kouhei (in TOK), 2013/10/31 04:26:36]

These will be used on non-Android/aura platforms as a fallback implementation.

+      const WebKit::WebTouchEvent& web_touch,
+      const ui::LatencyInfo& latency_info) {
+  RenderWidgetHostImpl* host = RenderWidgetHostImpl::From(
+      render_view_->GetRenderWidgetHost());
+  host->ForwardTouchEventWithLatencyInfo(web_touch, latency_info);
+}
+
+void SyntheticGestureTargetBase::QueueWebMouseWheelEventToPlatform(
+      const WebKit::WebMouseWheelEvent& web_wheel,
+      const ui::LatencyInfo& latency_info) {
+  RenderWidgetHostImpl* host = RenderWidgetHostImpl::From(
+      render_view_->GetRenderWidgetHost());
+  host->ForwardWheelEventWithLatencyInfo(
+      MouseWheelEventWithLatencyInfo(web_wheel, latency_info));
+}
+
+void SyntheticGestureTargetBase::QueueWebMouseEventToPlatform(
+      const WebKit::WebMouseEvent& web_mouse,
+      const ui::LatencyInfo& latency_info) {
+  RenderWidgetHostImpl* host = RenderWidgetHostImpl::From(
+      render_view_->GetRenderWidgetHost());
+  host->ForwardMouseEventWithLatencyInfo(
+      MouseEventWithLatencyInfo(web_mouse, latency_info));
+}
+
+void SyntheticGestureTargetBase::OnSyntheticGestureCompleted(
+    SyntheticGestureNew::Result result) {

[jdduke (slow), 2013/10/30 19:02:43]

Did we need to do something here? Send an ack to the renderer? Or maybe that
comes later when it's all wired up?

[Dominik Grewe, 2013/10/30 19:11:59]

Yes, we don't have the message types yet. We'll add it once it's all being wired
up.

+}
+
+base::TimeDelta
+SyntheticGestureTargetBase::GetSyntheticGestureUpdateRate() const {
+  return base::TimeDelta::FromMilliseconds(kSyntheticGestureMessageIntervalMs);
+}
+
+SyntheticGestureParams::GestureSourceType
+SyntheticGestureTargetBase::GetDefaultSyntheticGestureSourceType() const {
+  return SyntheticGestureParams::MOUSE_INPUT;
+}
+
+bool SyntheticGestureTargetBase::SupportsSyntheticGestureSourceType(
+    SyntheticGestureParams::GestureSourceType gesture_source_type) const {
+  return gesture_source_type == SyntheticGestureParams::MOUSE_INPUT ||
+      gesture_source_type == SyntheticGestureParams::TOUCH_INPUT;
+}
+
+}  // namespace content