1// Copyright (c) 2012 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/event_utils.h"
6
7#include <vector>
8
9#include "ui/events/event.h"
10#include "ui/gfx/display.h"
11#include "ui/gfx/screen.h"
12
13namespace ui {
14
15namespace {
16int g_custom_event_types = ET_LAST;
17}  // namespace
18
19scoped_ptr<Event> EventFromNative(const base::NativeEvent& native_event) {
20  scoped_ptr<Event> event;
21  EventType type = EventTypeFromNative(native_event);
22  switch(type) {
23    case ET_KEY_PRESSED:
24    case ET_KEY_RELEASED:
25      event.reset(new KeyEvent(native_event));
26      break;
27
28    case ET_TRANSLATED_KEY_PRESS:
29    case ET_TRANSLATED_KEY_RELEASE:
30      // These should not be generated by native events.
31      NOTREACHED();
32      break;
33
34    case ET_MOUSE_PRESSED:
35    case ET_MOUSE_DRAGGED:
36    case ET_MOUSE_RELEASED:
37    case ET_MOUSE_MOVED:
38    case ET_MOUSE_ENTERED:
39    case ET_MOUSE_EXITED:
40      event.reset(new MouseEvent(native_event));
41      break;
42
43    case ET_MOUSEWHEEL:
44      event.reset(new MouseWheelEvent(native_event));
45      break;
46
47    case ET_SCROLL_FLING_START:
48    case ET_SCROLL_FLING_CANCEL:
49    case ET_SCROLL:
50      event.reset(new ScrollEvent(native_event));
51      break;
52
53    case ET_TOUCH_RELEASED:
54    case ET_TOUCH_PRESSED:
55    case ET_TOUCH_MOVED:
56    case ET_TOUCH_CANCELLED:
57      event.reset(new TouchEvent(native_event));
58      break;
59
60    default:
61      break;
62  }
63  return event.Pass();
64}
65
66// From third_party/WebKit/Source/web/gtk/WebInputEventFactory.cpp:
67base::char16 GetControlCharacterForKeycode(int windows_key_code, bool shift) {
68  if (windows_key_code >= ui::VKEY_A &&
69    windows_key_code <= ui::VKEY_Z) {
70    // ctrl-A ~ ctrl-Z map to \x01 ~ \x1A
71    return windows_key_code - ui::VKEY_A + 1;
72  }
73  if (shift) {
74    // following graphics chars require shift key to input.
75    switch (windows_key_code) {
76      // ctrl-@ maps to \x00 (Null byte)
77      case ui::VKEY_2:
78        return 0;
79      // ctrl-^ maps to \x1E (Record separator, Information separator two)
80      case ui::VKEY_6:
81        return 0x1E;
82      // ctrl-_ maps to \x1F (Unit separator, Information separator one)
83      case ui::VKEY_OEM_MINUS:
84        return 0x1F;
85      // Returns 0 for all other keys to avoid inputting unexpected chars.
86      default:
87        break;
88    }
89  } else {
90    switch (windows_key_code) {
91      // ctrl-[ maps to \x1B (Escape)
92      case ui::VKEY_OEM_4:
93        return 0x1B;
94      // ctrl-\ maps to \x1C (File separator, Information separator four)
95      case ui::VKEY_OEM_5:
96        return 0x1C;
97      // ctrl-] maps to \x1D (Group separator, Information separator three)
98      case ui::VKEY_OEM_6:
99        return 0x1D;
100      // ctrl-Enter maps to \x0A (Line feed)
101      case ui::VKEY_RETURN:
102        return 0x0A;
103      // Returns 0 for all other keys to avoid inputting unexpected chars.
104      default:
105        break;
106    }
107  }
108  return 0;
109}
110
111int RegisterCustomEventType() {
112  return ++g_custom_event_types;
113}
114
115base::TimeDelta EventTimeForNow() {
116  return base::TimeDelta::FromInternalValue(
117      base::TimeTicks::Now().ToInternalValue());
118}
119
120bool ShouldDefaultToNaturalScroll() {
121  return GetInternalDisplayTouchSupport() ==
122      gfx::Display::TOUCH_SUPPORT_AVAILABLE;
123}
124
125gfx::Display::TouchSupport GetInternalDisplayTouchSupport() {
126  gfx::Screen* screen = gfx::Screen::GetScreenByType(gfx::SCREEN_TYPE_NATIVE);
127  // No screen in some unit tests.
128  if (!screen)
129    return gfx::Display::TOUCH_SUPPORT_UNKNOWN;
130  const std::vector<gfx::Display>& displays = screen->GetAllDisplays();
131  for (std::vector<gfx::Display>::const_iterator it = displays.begin();
132       it != displays.end(); ++it) {
133    if (it->IsInternal())
134      return it->touch_support();
135  }
136  return gfx::Display::TOUCH_SUPPORT_UNAVAILABLE;
137}
138
139}  // namespace ui
140