ui/events/gestures/motion_event_aura.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 // MSVC++ requires this to be set before any other includes to get M_PI.
   6 #define _USE_MATH_DEFINES
   7
   8 #include "ui/events/gestures/motion_event_aura.h"
   9
  10 #include <cmath>
  11
  12 #include "base/logging.h"
  13 #include "ui/events/gesture_detection/gesture_configuration.h"
  14
  15 namespace ui {
  16 namespace {
  17
  18 PointerProperties GetPointerPropertiesFromTouchEvent(const TouchEvent& touch) {
  19   PointerProperties pointer_properties;
  20   pointer_properties.x = touch.x();
  21   pointer_properties.y = touch.y();
  22   pointer_properties.raw_x = touch.root_location_f().x();
  23   pointer_properties.raw_y = touch.root_location_f().y();
  24   pointer_properties.id = touch.touch_id();
  25   pointer_properties.pressure = touch.force();
  26   pointer_properties.source_device_id = touch.source_device_id();
  27
  28   float radius_x = touch.radius_x();
  29   float radius_y = touch.radius_y();
  30   float rotation_angle_rad = touch.rotation_angle() * M_PI / 180.f;
  31   DCHECK_GE(radius_x, 0) << "Unexpected x-radius < 0";
  32   DCHECK_GE(radius_y, 0) << "Unexpected y-radius < 0";
  33   DCHECK(0 <= rotation_angle_rad && rotation_angle_rad <= M_PI_2)
  34       << "Unexpected touch rotation angle";
  35
  36   if (radius_x > radius_y) {
  37     // The case radius_x == radius_y is omitted from here on purpose: for
  38     // circles, we want to pass the angle (which could be any value in such
  39     // cases but always seem to be set to zero) unchanged.
  40     pointer_properties.touch_major = 2.f * radius_x;
  41     pointer_properties.touch_minor = 2.f * radius_y;
  42     pointer_properties.orientation = rotation_angle_rad - M_PI_2;
  43   } else {
  44     pointer_properties.touch_major = 2.f * radius_y;
  45     pointer_properties.touch_minor = 2.f * radius_x;
  46     pointer_properties.orientation = rotation_angle_rad;
  47   }
  48
  49   if (!pointer_properties.touch_major) {
  50     pointer_properties.touch_major =
  51         2.f * GestureConfiguration::GetInstance()->default_radius();
  52     pointer_properties.touch_minor =
  53         2.f * GestureConfiguration::GetInstance()->default_radius();
  54     pointer_properties.orientation = 0;
  55   }
  56
  57   // TODO(jdduke): Plumb tool type from the platform, crbug.com/404128.
  58   pointer_properties.tool_type = MotionEvent::TOOL_TYPE_UNKNOWN;
  59
  60   return pointer_properties;
  61 }
  62
  63 }  // namespace
  64
  65 MotionEventAura::MotionEventAura() {
  66   set_action_index(-1);
  67 }
  68
  69 MotionEventAura::~MotionEventAura() {
  70 }
  71
  72 void MotionEventAura::OnTouch(const TouchEvent& touch) {
  73   switch (touch.type()) {
  74     case ET_TOUCH_PRESSED:
  75       AddTouch(touch);
  76       break;
  77     case ET_TOUCH_RELEASED:
  78     case ET_TOUCH_CANCELLED:
  79       // Removing these touch points needs to be postponed until after the
  80       // MotionEvent has been dispatched. This cleanup occurs in
  81       // CleanupRemovedTouchPoints.
  82       UpdateTouch(touch);
  83       break;
  84     case ET_TOUCH_MOVED:
  85       UpdateTouch(touch);
  86       break;
  87     default:
  88       NOTREACHED();
  89       break;
  90   }
  91
  92   UpdateCachedAction(touch);
  93   set_flags(touch.flags());
  94   set_event_time(touch.time_stamp() + base::TimeTicks());
  95 }
  96
  97 int MotionEventAura::GetId() const {
  98   return GetPointerId(0);
  99 }
 100
 101 void MotionEventAura::CleanupRemovedTouchPoints(const TouchEvent& event) {
 102   if (event.type() != ET_TOUCH_RELEASED &&
 103       event.type() != ET_TOUCH_CANCELLED) {
 104     return;
 105   }
 106
 107   DCHECK(GetPointerCount());
 108   int index_to_delete = GetIndexFromId(event.touch_id());
 109   set_action_index(0);
 110   pointer(index_to_delete) = pointer(GetPointerCount() - 1);
 111   PopPointer();
 112 }
 113
 114 int MotionEventAura::GetSourceDeviceId(size_t pointer_index) const {
 115   DCHECK_LT(pointer_index, GetPointerCount());
 116   return pointer(pointer_index).source_device_id;
 117 }
 118
 119 void MotionEventAura::AddTouch(const TouchEvent& touch) {
 120   if (GetPointerCount() == MotionEvent::MAX_TOUCH_POINT_COUNT)
 121     return;
 122
 123   PushPointer(GetPointerPropertiesFromTouchEvent(touch));
 124 }
 125
 126 void MotionEventAura::UpdateTouch(const TouchEvent& touch) {
 127   pointer(GetIndexFromId(touch.touch_id())) =
 128       GetPointerPropertiesFromTouchEvent(touch);
 129 }
 130
 131 void MotionEventAura::UpdateCachedAction(const TouchEvent& touch) {
 132   DCHECK(GetPointerCount());
 133   switch (touch.type()) {
 134     case ET_TOUCH_PRESSED:
 135       if (GetPointerCount() == 1) {
 136         set_action(ACTION_DOWN);
 137       } else {
 138         set_action(ACTION_POINTER_DOWN);
 139         set_action_index(GetIndexFromId(touch.touch_id()));
 140       }
 141       break;
 142     case ET_TOUCH_RELEASED:
 143       if (GetPointerCount() == 1) {
 144         set_action(ACTION_UP);
 145       } else {
 146         set_action(ACTION_POINTER_UP);
 147         set_action_index(GetIndexFromId(touch.touch_id()));
 148       }
 149       break;
 150     case ET_TOUCH_CANCELLED:
 151       set_action(ACTION_CANCEL);
 152       break;
 153     case ET_TOUCH_MOVED:
 154       set_action(ACTION_MOVE);
 155       break;
 156     default:
 157       NOTREACHED();
 158       break;
 159   }
 160 }
 161
 162 int MotionEventAura::GetIndexFromId(int id) const {
 163   int index = FindPointerIndexOfId(id);
 164   DCHECK_GE(index, 0);
 165   DCHECK_LT(index, static_cast<int>(GetPointerCount()));
 166   return index;
 167 }
 168
 169 }  // namespace ui