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 int RegisterCustomEventType() {
  67   return ++g_custom_event_types;
  68 }
  69
  70 base::TimeDelta EventTimeForNow() {
  71   return base::TimeDelta::FromInternalValue(
  72       base::TimeTicks::Now().ToInternalValue());
  73 }
  74
  75 bool ShouldDefaultToNaturalScroll() {
  76   return GetInternalDisplayTouchSupport() ==
  77       gfx::Display::TOUCH_SUPPORT_AVAILABLE;
  78 }
  79
  80 gfx::Display::TouchSupport GetInternalDisplayTouchSupport() {
  81   gfx::Screen* screen = gfx::Screen::GetScreenByType(gfx::SCREEN_TYPE_NATIVE);
  82   // No screen in some unit tests.
  83   if (!screen)
  84     return gfx::Display::TOUCH_SUPPORT_UNKNOWN;
  85   const std::vector<gfx::Display>& displays = screen->GetAllDisplays();
  86   for (std::vector<gfx::Display>::const_iterator it = displays.begin();
  87        it != displays.end(); ++it) {
  88     if (it->IsInternal())
  89       return it->touch_support();
  90   }
  91   return gfx::Display::TOUCH_SUPPORT_UNAVAILABLE;
  92 }
  93
  94 }  // namespace ui