WindowManagerApp should recognize gestures

ui/events/gestures/motion_event_aura.cc

-// Copyright 2014 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.
-
-// MSVC++ requires this to be set before any other includes to get M_PI.
-#define _USE_MATH_DEFINES
-
-#include "ui/events/gestures/motion_event_aura.h"
-
-#include <cmath>
-
-#include "base/logging.h"
-#include "ui/events/gestures/gesture_configuration.h"
-
-namespace ui {
-
-MotionEventAura::MotionEventAura()
-    : pointer_count_(0), cached_action_index_(-1) {
-}
-
-MotionEventAura::MotionEventAura(
-    size_t pointer_count,
-    const base::TimeTicks& last_touch_time,
-    Action cached_action,
-    int cached_action_index,
-    int flags,
-    const PointData (&active_touches)[MotionEvent::MAX_TOUCH_POINT_COUNT])
-    : pointer_count_(pointer_count),
-      last_touch_time_(last_touch_time),
-      cached_action_(cached_action),
-      cached_action_index_(cached_action_index),
-      flags_(flags) {
-  DCHECK(pointer_count_);
-  for (size_t i = 0; i < pointer_count; ++i)
-    active_touches_[i] = active_touches[i];
-}
-
-MotionEventAura::~MotionEventAura() {}
-
-MotionEventAura::PointData MotionEventAura::GetPointDataFromTouchEvent(
-    const TouchEvent& touch) {
-  PointData point_data;
-  point_data.x = touch.x();
-  point_data.y = touch.y();
-  point_data.raw_x = touch.root_location_f().x();
-  point_data.raw_y = touch.root_location_f().y();
-  point_data.touch_id = touch.touch_id();
-  point_data.pressure = touch.force();
-  point_data.source_device_id = touch.source_device_id();
-
-  float radius_x = touch.radius_x();
-  float radius_y = touch.radius_y();
-  float rotation_angle_rad = touch.rotation_angle() * M_PI / 180.f;
-  DCHECK_GE(radius_x, 0) << "Unexpected x-radius < 0";
-  DCHECK_GE(radius_y, 0) << "Unexpected y-radius < 0";
-  DCHECK(0 <= rotation_angle_rad && rotation_angle_rad <= M_PI_2)
-      << "Unexpected touch rotation angle";
-
-  if (radius_x > radius_y) {
-    // The case radius_x == radius_y is omitted from here on purpose: for
-    // circles, we want to pass the angle (which could be any value in such
-    // cases but always seem to be set to zero) unchanged.
-    point_data.touch_major = 2.f * radius_x;
-    point_data.touch_minor = 2.f * radius_y;
-    point_data.orientation = rotation_angle_rad - M_PI_2;
-  } else {
-    point_data.touch_major = 2.f * radius_y;
-    point_data.touch_minor = 2.f * radius_x;
-    point_data.orientation = rotation_angle_rad;
-  }
-
-  if (!point_data.touch_major) {
-    point_data.touch_major = 2.f * GestureConfiguration::default_radius();
-    point_data.touch_minor = 2.f * GestureConfiguration::default_radius();
-    point_data.orientation = 0;
-  }
-
-  return point_data;
-}
-
-void MotionEventAura::OnTouch(const TouchEvent& touch) {
-  switch (touch.type()) {
-    case ET_TOUCH_PRESSED:
-      AddTouch(touch);
-      break;
-    case ET_TOUCH_RELEASED:
-    case ET_TOUCH_CANCELLED:
-      // Removing these touch points needs to be postponed until after the
-      // MotionEvent has been dispatched. This cleanup occurs in
-      // CleanupRemovedTouchPoints.
-      UpdateTouch(touch);
-      break;
-    case ET_TOUCH_MOVED:
-      UpdateTouch(touch);
-      break;
-    default:
-      NOTREACHED();
-      break;
-  }
-
-  UpdateCachedAction(touch);
-  flags_ = touch.flags();
-  last_touch_time_ = touch.time_stamp() + base::TimeTicks();
-}
-
-int MotionEventAura::GetId() const {
-  return GetPointerId(0);
-}
-
-MotionEvent::Action MotionEventAura::GetAction() const {
-  return cached_action_;
-}
-
-int MotionEventAura::GetActionIndex() const {
-  DCHECK(cached_action_ == ACTION_POINTER_DOWN ||
-         cached_action_ == ACTION_POINTER_UP);
-  DCHECK_GE(cached_action_index_, 0);
-  DCHECK_LT(cached_action_index_, static_cast<int>(pointer_count_));
-  return cached_action_index_;
-}
-
-size_t MotionEventAura::GetPointerCount() const { return pointer_count_; }
-
-int MotionEventAura::GetPointerId(size_t pointer_index) const {
-  DCHECK_LT(pointer_index, pointer_count_);
-  return active_touches_[pointer_index].touch_id;
-}
-
-float MotionEventAura::GetX(size_t pointer_index) const {
-  DCHECK_LT(pointer_index, pointer_count_);
-  return active_touches_[pointer_index].x;
-}
-
-float MotionEventAura::GetY(size_t pointer_index) const {
-  DCHECK_LT(pointer_index, pointer_count_);
-  return active_touches_[pointer_index].y;
-}
-
-float MotionEventAura::GetRawX(size_t pointer_index) const {
-  DCHECK_LT(pointer_index, pointer_count_);
-  return active_touches_[pointer_index].raw_x;
-}
-
-float MotionEventAura::GetRawY(size_t pointer_index) const {
-  DCHECK_LT(pointer_index, pointer_count_);
-  return active_touches_[pointer_index].raw_y;
-}
-
-float MotionEventAura::GetTouchMajor(size_t pointer_index) const {
-  DCHECK_LT(pointer_index, pointer_count_);
-  return active_touches_[pointer_index].touch_major;
-}
-
-float MotionEventAura::GetTouchMinor(size_t pointer_index) const {
-  DCHECK_LE(pointer_index, pointer_count_);
-  return active_touches_[pointer_index].touch_minor;
-}
-
-float MotionEventAura::GetOrientation(size_t pointer_index) const {
-  DCHECK_LE(pointer_index, pointer_count_);
-  return active_touches_[pointer_index].orientation;
-}
-
-float MotionEventAura::GetPressure(size_t pointer_index) const {
-  DCHECK_LT(pointer_index, pointer_count_);
-  return active_touches_[pointer_index].pressure;
-}
-
-MotionEvent::ToolType MotionEventAura::GetToolType(size_t pointer_index) const {
-  // TODO(jdduke): Plumb tool type from the platform, crbug.com/404128.
-  DCHECK_LT(pointer_index, pointer_count_);
-  return MotionEvent::TOOL_TYPE_UNKNOWN;
-}
-
-int MotionEventAura::GetButtonState() const {
-  NOTIMPLEMENTED();
-  return 0;
-}
-
-int MotionEventAura::GetFlags() const {
-  return flags_;
-}
-
-base::TimeTicks MotionEventAura::GetEventTime() const {
-  return last_touch_time_;
-}
-
-scoped_ptr<MotionEvent> MotionEventAura::Clone() const {
-  return scoped_ptr<MotionEvent>(new MotionEventAura(pointer_count_,
-                                                     last_touch_time_,
-                                                     cached_action_,
-                                                     cached_action_index_,
-                                                     flags_,
-                                                     active_touches_));
-}
-scoped_ptr<MotionEvent> MotionEventAura::Cancel() const {
-  return scoped_ptr<MotionEvent>(new MotionEventAura(
-      pointer_count_, last_touch_time_, ACTION_CANCEL, -1, 0, active_touches_));
-}
-
-void MotionEventAura::CleanupRemovedTouchPoints(const TouchEvent& event) {
-  if (event.type() != ET_TOUCH_RELEASED &&
-      event.type() != ET_TOUCH_CANCELLED) {
-    return;
-  }
-
-  int index_to_delete = static_cast<int>(GetIndexFromId(event.touch_id()));
-  pointer_count_--;
-  active_touches_[index_to_delete] = active_touches_[pointer_count_];
-}
-
-MotionEventAura::PointData::PointData()
-    : x(0),
-      y(0),
-      raw_x(0),
-      raw_y(0),
-      touch_id(0),
-      pressure(0),
-      source_device_id(0),
-      touch_major(0),
-      touch_minor(0),
-      orientation(0) {
-}
-
-int MotionEventAura::GetSourceDeviceId(size_t pointer_index) const {
-  DCHECK_LT(pointer_index, pointer_count_);
-  return active_touches_[pointer_index].source_device_id;
-}
-
-void MotionEventAura::AddTouch(const TouchEvent& touch) {
-  if (pointer_count_ == MotionEvent::MAX_TOUCH_POINT_COUNT)
-    return;
-
-  active_touches_[pointer_count_] = GetPointDataFromTouchEvent(touch);
-  pointer_count_++;
-}
-
-
-void MotionEventAura::UpdateTouch(const TouchEvent& touch) {
-  active_touches_[GetIndexFromId(touch.touch_id())] =
-      GetPointDataFromTouchEvent(touch);
-}
-
-void MotionEventAura::UpdateCachedAction(const TouchEvent& touch) {
-  DCHECK(pointer_count_);
-  switch (touch.type()) {
-    case ET_TOUCH_PRESSED:
-      if (pointer_count_ == 1) {
-        cached_action_ = ACTION_DOWN;
-      } else {
-        cached_action_ = ACTION_POINTER_DOWN;
-        cached_action_index_ =
-            static_cast<int>(GetIndexFromId(touch.touch_id()));
-      }
-      break;
-    case ET_TOUCH_RELEASED:
-      if (pointer_count_ == 1) {
-        cached_action_ = ACTION_UP;
-      } else {
-        cached_action_ = ACTION_POINTER_UP;
-        cached_action_index_ =
-            static_cast<int>(GetIndexFromId(touch.touch_id()));
-        DCHECK_LT(cached_action_index_, static_cast<int>(pointer_count_));
-      }
-      break;
-    case ET_TOUCH_CANCELLED:
-      cached_action_ = ACTION_CANCEL;
-      break;
-    case ET_TOUCH_MOVED:
-      cached_action_ = ACTION_MOVE;
-      break;
-    default:
-      NOTREACHED();
-      break;
-  }
-}
-
-size_t MotionEventAura::GetIndexFromId(int id) const {
-  for (size_t i = 0; i < pointer_count_; ++i) {
-    if (active_touches_[i].touch_id == id)
-      return i;
-  }
-  NOTREACHED();
-  return 0;
-}
-
-}  // namespace ui