Add EventForwarder for routing touch events

ui/android/event_handler.cc

+// Copyright 2017 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 "ui/android/event_handler.h"
+
+#include "base/android/jni_android.h"
+#include "jni/EventHandler_jni.h"
+#include "ui/android/view_android.h"
+#include "ui/android/view_client.h"
+#include "ui/events/android/motion_event_android.h"
+
+namespace ui {
+
+using base::android::JavaParamRef;
+using base::android::ScopedJavaLocalRef;
+
+EventHandler* EventHandler::Create(ViewAndroid* view) {
+  return new EventHandler(view);
+}
+
+EventHandler::EventHandler(ViewAndroid* view) : view_(view) {}
+
+ScopedJavaLocalRef<jobject> EventHandler::CreateJavaObject() {

[boliu, 2017/03/02 20:58:14]

should create only one java side for each native side, and as discussed before,
it's ok to hold a strong ref here because java side doesn't reference anything
else

[Jinsuk Kim, 2017/03/03 06:29:21]

Done.

+  return Java_EventHandler_create(base::android::AttachCurrentThread(),
+                                  reinterpret_cast<intptr_t>(this));
+}
+
+jboolean EventHandler::OnTouchEvent(JNIEnv* env,
+                                    const JavaParamRef<jobject>& obj,
+                                    const JavaParamRef<jobject>& motion_event,
+                                    jlong time_ms,
+                                    jint android_action,
+                                    jint pointer_count,
+                                    jint history_size,
+                                    jint action_index,
+                                    jfloat pos_x_0,
+                                    jfloat pos_y_0,
+                                    jfloat pos_x_1,
+                                    jfloat pos_y_1,
+                                    jint pointer_id_0,
+                                    jint pointer_id_1,
+                                    jfloat touch_major_0,
+                                    jfloat touch_major_1,
+                                    jfloat touch_minor_0,
+                                    jfloat touch_minor_1,
+                                    jfloat orientation_0,
+                                    jfloat orientation_1,
+                                    jfloat tilt_0,
+                                    jfloat tilt_1,
+                                    jfloat raw_pos_x,
+                                    jfloat raw_pos_y,
+                                    jint android_tool_type_0,
+                                    jint android_tool_type_1,
+                                    jint android_button_state,
+                                    jint android_meta_state,
+                                    jboolean is_touch_handle_event) {
+  return view_->OnTouchEvent(MotionEventData::ForTouch(
+      view_->GetDipScale(), motion_event.obj(), time_ms, android_action,
+      pointer_count, history_size, action_index, pos_x_0, pos_y_0, pos_x_1,
+      pos_y_1, pointer_id_0, pointer_id_1, touch_major_0, touch_major_1,
+      touch_minor_0, touch_minor_1, orientation_0, orientation_1, tilt_0,
+      tilt_1, raw_pos_x, raw_pos_y, android_tool_type_0, android_tool_type_1,
+      android_button_state, android_meta_state, is_touch_handle_event));
+}
+
+void EventHandler::OnMouseEvent(JNIEnv* env,
+                                const JavaParamRef<jobject>& obj,
+                                jlong time_ms,
+                                jint android_action,
+                                jfloat x,
+                                jfloat y,
+                                jint pointer_id,
+                                jfloat orientation,
+                                jfloat pressure,
+                                jfloat tilt,
+                                jint android_action_button,
+                                jint android_button_state,
+                                jint android_meta_state,
+                                jint android_tool_type) {
+  view_->OnMouseEvent(MotionEventData::ForMouse(
+      view_->GetDipScale(), time_ms, android_action, x, y, pointer_id,
+      orientation, pressure, tilt, android_action_button, android_button_state,
+      android_meta_state, android_tool_type));
+}
+
+bool RegisterEventHandler(JNIEnv* env) {
+  return RegisterNativesImpl(env);
+}
+
+}  // namespace ui