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                                          float delta_x,
  15                                          float delta_y)
  16     : type_(type), touch_points_(1), oldest_touch_id_(0) {
  17   DCHECK_GE(type, ET_GESTURE_TYPE_START);
  18   DCHECK_LE(type, ET_GESTURE_TYPE_END);
  19   switch (type_) {
  20     case ui::ET_GESTURE_SCROLL_BEGIN:
  21       data.scroll_begin.x_hint = delta_x;
  22       data.scroll_begin.y_hint = delta_y;
  23       break;
  24
  25     case ui::ET_GESTURE_SCROLL_UPDATE:
  26       data.scroll_update.x = delta_x;
  27       data.scroll_update.y = delta_y;
  28       break;
  29
  30     case ui::ET_SCROLL_FLING_START:
  31       data.fling_velocity.x = delta_x;
  32       data.fling_velocity.y = delta_y;
  33       break;
  34
  35     case ui::ET_GESTURE_TWO_FINGER_TAP:
  36       data.first_finger_enclosing_rectangle.width = delta_x;
  37       data.first_finger_enclosing_rectangle.height = delta_y;
  38       break;
  39
  40     case ui::ET_GESTURE_PINCH_UPDATE:
  41       data.scale = delta_x;
  42       CHECK_EQ(0.f, delta_y) << "Unknown data in delta_y for pinch";
  43       break;
  44
  45     case ui::ET_GESTURE_SWIPE:
  46       data.swipe.left = delta_x < 0;
  47       data.swipe.right = delta_x > 0;
  48       data.swipe.up = delta_y < 0;
  49       data.swipe.down = delta_y > 0;
  50       break;
  51
  52     case ui::ET_GESTURE_TAP:
  53     case ui::ET_GESTURE_DOUBLE_TAP:
  54     case ui::ET_GESTURE_TAP_UNCONFIRMED:
  55       data.tap_count = static_cast<int>(delta_x);
  56       CHECK_EQ(0.f, delta_y) << "Unknown data in delta_y for tap.";
  57       break;
  58
  59     default:
  60       if (delta_x != 0.f || delta_y != 0.f) {
  61         DLOG(WARNING) << "A gesture event (" << type << ") had unknown data: ("
  62                       << delta_x << "," << delta_y;
  63       }
  64       break;
  65   }
  66 }
  67
  68 GestureEventDetails::Details::Details() {
  69   memset(this, 0, sizeof(Details));
  70 }
  71
  72 }  // namespace ui