ui/events/gesture_event_details.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 #include "ui/events/gesture_event_details.h"
   6
   7 namespace ui {
   8
   9 GestureEventDetails::GestureEventDetails()
  10     : type_(ET_UNKNOWN), touch_points_(0), oldest_touch_id_(-1) {
  11 }
  12
  13 GestureEventDetails::GestureEventDetails(ui::EventType type)
  14     : type_(type), touch_points_(1), oldest_touch_id_(-1) {
  15   DCHECK_GE(type, ET_GESTURE_TYPE_START);
  16   DCHECK_LE(type, ET_GESTURE_TYPE_END);
  17 }
  18
  19 GestureEventDetails::GestureEventDetails(ui::EventType type,
  20                                          float delta_x,
  21                                          float delta_y)
  22     : type_(type), touch_points_(1), oldest_touch_id_(-1) {
  23   DCHECK_GE(type, ET_GESTURE_TYPE_START);
  24   DCHECK_LE(type, ET_GESTURE_TYPE_END);
  25   switch (type_) {
  26     case ui::ET_GESTURE_SCROLL_BEGIN:
  27       data_.scroll_begin.x_hint = delta_x;
  28       data_.scroll_begin.y_hint = delta_y;
  29       break;
  30
  31     case ui::ET_GESTURE_SCROLL_UPDATE:
  32       data_.scroll_update.x = delta_x;
  33       data_.scroll_update.y = delta_y;
  34       break;
  35
  36     case ui::ET_SCROLL_FLING_START:
  37       data_.fling_velocity.x = delta_x;
  38       data_.fling_velocity.y = delta_y;
  39       break;
  40
  41     case ui::ET_GESTURE_TWO_FINGER_TAP:
  42       data_.first_finger_enclosing_rectangle.width = delta_x;
  43       data_.first_finger_enclosing_rectangle.height = delta_y;
  44       break;
  45
  46     case ui::ET_GESTURE_SWIPE:
  47       data_.swipe.left = delta_x < 0;
  48       data_.swipe.right = delta_x > 0;
  49       data_.swipe.up = delta_y < 0;
  50       data_.swipe.down = delta_y > 0;
  51       break;
  52
  53     default:
  54       NOTREACHED() << "Invalid event type for constructor: " << type;
  55   }
  56 }
  57
  58 GestureEventDetails::GestureEventDetails(ui::EventType type,
  59                                          const GestureEventDetails& other)
  60     : type_(type),
  61       data_(other.data_),
  62       touch_points_(other.touch_points_),
  63       bounding_box_(other.bounding_box_),
  64       oldest_touch_id_(other.oldest_touch_id_) {
  65   DCHECK_GE(type, ET_GESTURE_TYPE_START);
  66   DCHECK_LE(type, ET_GESTURE_TYPE_END);
  67   switch (type) {
  68     case ui::ET_GESTURE_SCROLL_BEGIN:
  69       // Synthetic creation of SCROLL_BEGIN from PINCH_BEGIN is explicitly
  70       // allowed as an exception.
  71       if (other.type() == ui::ET_GESTURE_PINCH_BEGIN)
  72         break;
  73     case ui::ET_GESTURE_SCROLL_UPDATE:
  74     case ui::ET_SCROLL_FLING_START:
  75     case ui::ET_GESTURE_SWIPE:
  76     case ui::ET_GESTURE_PINCH_UPDATE:
  77       DCHECK_EQ(type, other.type()) << " - Invalid gesture conversion from "
  78                                     << other.type() << " to " << type;
  79       break;
  80     default:
  81       break;
  82   }
  83 }
  84
  85 GestureEventDetails::Details::Details() {
  86   memset(this, 0, sizeof(Details));
  87 }
  88
  89 }  // namespace ui