ui/events/event_utils.cc

   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
  13 namespace ui {
  14
  15 namespace {
  16 int g_custom_event_types = ET_LAST;
  17 }  // namespace
  18
  19 scoped_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 #if defined(OS_LINUX)
  67 // From third_party/WebKit/Source/web/gtk/WebInputEventFactory.cpp:
  68 uint16 GetControlCharacterForKeycode(int windows_key_code, bool shift) {
  69   if (windows_key_code >= ui::VKEY_A &&
  70     windows_key_code <= ui::VKEY_Z) {
  71     // ctrl-A ~ ctrl-Z map to \x01 ~ \x1A
  72     return windows_key_code - ui::VKEY_A + 1;
  73   }
  74   if (shift) {
  75     // following graphics chars require shift key to input.
  76     switch (windows_key_code) {
  77       // ctrl-@ maps to \x00 (Null byte)
  78       case ui::VKEY_2:
  79         return 0;
  80       // ctrl-^ maps to \x1E (Record separator, Information separator two)
  81       case ui::VKEY_6:
  82         return 0x1E;
  83       // ctrl-_ maps to \x1F (Unit separator, Information separator one)
  84       case ui::VKEY_OEM_MINUS:
  85         return 0x1F;
  86       // Returns 0 for all other keys to avoid inputting unexpected chars.
  87       default:
  88         break;
  89     }
  90   } else {
  91     switch (windows_key_code) {
  92       // ctrl-[ maps to \x1B (Escape)
  93       case ui::VKEY_OEM_4:
  94         return 0x1B;
  95       // ctrl-\ maps to \x1C (File separator, Information separator four)
  96       case ui::VKEY_OEM_5:
  97         return 0x1C;
  98       // ctrl-] maps to \x1D (Group separator, Information separator three)
  99       case ui::VKEY_OEM_6:
 100         return 0x1D;
 101       // ctrl-Enter maps to \x0A (Line feed)
 102       case ui::VKEY_RETURN:
 103         return 0x0A;
 104       // Returns 0 for all other keys to avoid inputting unexpected chars.
 105       default:
 106         break;
 107     }
 108   }
 109   return 0;
 110 }
 111 #endif
 112
 113 int RegisterCustomEventType() {
 114   return ++g_custom_event_types;
 115 }
 116
 117 base::TimeDelta EventTimeForNow() {
 118   return base::TimeDelta::FromInternalValue(
 119       base::TimeTicks::Now().ToInternalValue());
 120 }
 121
 122 bool ShouldDefaultToNaturalScroll() {
 123   return GetInternalDisplayTouchSupport() ==
 124       gfx::Display::TOUCH_SUPPORT_AVAILABLE;
 125 }
 126
 127 gfx::Display::TouchSupport GetInternalDisplayTouchSupport() {
 128   gfx::Screen* screen = gfx::Screen::GetScreenByType(gfx::SCREEN_TYPE_NATIVE);
 129   // No screen in some unit tests.
 130   if (!screen)
 131     return gfx::Display::TOUCH_SUPPORT_UNKNOWN;
 132   const std::vector<gfx::Display>& displays = screen->GetAllDisplays();
 133   for (std::vector<gfx::Display>::const_iterator it = displays.begin();
 134        it != displays.end(); ++it) {
 135     if (it->IsInternal())
 136       return it->touch_support();
 137   }
 138   return gfx::Display::TOUCH_SUPPORT_UNAVAILABLE;
 139 }
 140
 141 }  // namespace ui