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() : type_(ET_UNKNOWN) {}
  10
  11 GestureEventDetails::GestureEventDetails(ui::EventType type,
  12                                          float delta_x,
  13                                          float delta_y)
  14     : type_(type),
  15       touch_points_(1) {
  16   DCHECK_GE(type, ET_GESTURE_TYPE_START);
  17   DCHECK_LE(type, ET_GESTURE_TYPE_END);
  18   switch (type_) {
  19     case ui::ET_GESTURE_SCROLL_BEGIN:
  20       data.scroll_begin.x_hint = delta_x;
  21       data.scroll_begin.y_hint = delta_y;
  22       break;
  23
  24     case ui::ET_GESTURE_SCROLL_UPDATE:
  25       data.scroll_update.x = delta_x;
  26       data.scroll_update.y = delta_y;
  27       break;
  28
  29     case ui::ET_SCROLL_FLING_START:
  30       data.fling_velocity.x = delta_x;
  31       data.fling_velocity.y = delta_y;
  32       break;
  33
  34     case ui::ET_GESTURE_TWO_FINGER_TAP:
  35       data.first_finger_enclosing_rectangle.width = delta_x;
  36       data.first_finger_enclosing_rectangle.height = delta_y;
  37       break;
  38
  39     case ui::ET_GESTURE_PINCH_UPDATE:
  40       data.scale = delta_x;
  41       CHECK_EQ(0.f, delta_y) << "Unknown data in delta_y for pinch";
  42       break;
  43
  44     case ui::ET_GESTURE_SWIPE:
  45       data.swipe.left = delta_x < 0;
  46       data.swipe.right = delta_x > 0;
  47       data.swipe.up = delta_y < 0;
  48       data.swipe.down = delta_y > 0;
  49       break;
  50
  51     case ui::ET_GESTURE_TAP:
  52     case ui::ET_GESTURE_DOUBLE_TAP:
  53     case ui::ET_GESTURE_TAP_UNCONFIRMED:
  54       data.tap_count = static_cast<int>(delta_x);
  55       CHECK_EQ(0.f, delta_y) << "Unknown data in delta_y for tap.";
  56       break;
  57
  58     default:
  59       if (delta_x != 0.f || delta_y != 0.f) {
  60         DLOG(WARNING) << "A gesture event (" << type << ") had unknown data: ("
  61                       << delta_x << "," << delta_y;
  62       }
  63       break;
  64   }
  65 }
  66
  67 GestureEventDetails::Details::Details() {
  68   memset(this, 0, sizeof(Details));
  69 }
  70
  71 }  // namespace ui