no route to host Chromium网页输入事件捕捉和手势检测过程分析(4)

参数nativeContentViewCoreImpl描写叙述的是C++层的一个ContentViewCoreImpl对象。函数Java_com_android_org_chromium_content_browser_ContentViewCore_nativeOnTouchEvent调用这个ContentViewCoreImpl对象的成员函数OnTouchEvent处理其他参数所描写叙述的Touch事件。

ContentViewCoreImpl类的成员函数OnTouchEvent的实现例如以下所看到的：

jboolean ContentViewCoreImpl::OnTouchEvent(JNIEnv* env,
                                           jobject obj,
                                           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 raw_pos_x,
                                           jfloat raw_pos_y,
                                           jint android_tool_type_0,
                                           jint android_tool_type_1,
                                           jint android_button_state) {
  RenderWidgetHostViewAndroid* rwhv = GetRenderWidgetHostViewAndroid();
  ......

  MotionEventAndroid event(1.f / dpi_scale(),
                           env,
                           motion_event,
                           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,
                           raw_pos_x,
                           raw_pos_y,
                           android_tool_type_0,
                           android_tool_type_1,
                           android_button_state);

  return rwhv->OnTouchEvent(event);
}

这个函数定义在文件external/chromium_org/content/browser/android/content_view_core_impl.cc中。

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