SyntheticGestureTarget implementation for injecting synthetic input events

content/browser/renderer_host/synthetic_touch_event_android.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/synthetic_touch_event_android.h"
+
+#include "content/browser/android/content_view_core_impl.h"
+#include "jni/SyntheticTouchEvent_jni.h"
+#include "third_party/WebKit/public/web/WebInputEvent.h"
+
+namespace {
+bool g_jni_initialized = false;
+
+void RegisterNativesIfNeeded(JNIEnv* env) {
+  if (!g_jni_initialized) {
+    content::RegisterNativesImpl(env);
+    g_jni_initialized = true;
+  }
+}
+}  // namespace
+
+namespace content {
+
+SyntheticTouchEventAndroid::SyntheticTouchEventAndroid(
+    ContentViewCoreImpl* content_view_core)
+    : env_(base::android::AttachCurrentThread()),
+      java_touch_event_(content_view_core->CreateSyntheticTouchEvent()),
+      saved_down_time_(0) {
+  CHECK(! java_touch_event_.is_null());
+  RegisterNativesIfNeeded(env_);
+}
+
+SyntheticTouchEventAndroid::~SyntheticTouchEventAndroid() {
+}
+
+void SyntheticTouchEventAndroid::reset() {
+  Java_SyntheticTouchEvent_reset(env_, java_touch_event_.obj());
+}
+
+long SyntheticTouchEventAndroid::GetCurrentTime() {
+  return Java_SyntheticTouchEvent_getCurrentTime(env_);
+}
+
+void SyntheticTouchEventAndroid::SetDownTime(long downTime) {
+  Java_SyntheticTouchEvent_setDownTime(env_, java_touch_event_.obj(),
+                                       downTime);
+}
+
+void SyntheticTouchEventAndroid::AddPointer(int x, int y, int id) {
+  Java_SyntheticTouchEvent_addPointer(env_, java_touch_event_.obj(), x, y, id);
+}
+
+void SyntheticTouchEventAndroid::Inject(Action action) {
+  Java_SyntheticTouchEvent_inject(env_, java_touch_event_.obj(),
+                                  static_cast<int>(action));
+}
+
+void SyntheticTouchEventAndroid::InjectWebTouchEvent(
+    const WebKit::WebTouchEvent* web_touch) {
+  reset();
+
+  SyntheticTouchEventAndroid::Action action =
+      SyntheticTouchEventAndroid::ActionInvalid;
+  switch (web_touch->type) {
+    case WebKit::WebInputEvent::TouchStart:
+      action = SyntheticTouchEventAndroid::ActionStart;
+      saved_down_time_ = GetCurrentTime();
+      break;
+    case WebKit::WebInputEvent::TouchMove:
+      action = SyntheticTouchEventAndroid::ActionMove;
+      break;
+    case WebKit::WebInputEvent::TouchCancel:
+      action = SyntheticTouchEventAndroid::ActionCancel;
+      break;
+    case WebKit::WebInputEvent::TouchEnd:
+      action = SyntheticTouchEventAndroid::ActionEnd;
+      break;
+    default:
+      NOTREACHED();
+  }
+  DCHECK(saved_down_time_ > 0);
+  SetDownTime(saved_down_time_);
+
+  const unsigned num_touches = web_touch->touchesLength;
+  for (unsigned i = 0; i < num_touches; ++ i) {
+    const WebKit::WebTouchPoint* point = &web_touch->touches[i];
+    AddPointer(point->position.x, point->position.y, point->id);
+  }
+
+  Inject(action);
+
+  if (web_touch->type == WebKit::WebInputEvent::TouchCancel ||
+      web_touch->type == WebKit::WebInputEvent::TouchEnd)
+    saved_down_time_ = 0;
+}
+
+}  // namespace content