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_MOUSE_PRESSED:
  29     case ET_MOUSE_DRAGGED:
  30     case ET_MOUSE_RELEASED:
  31     case ET_MOUSE_MOVED:
  32     case ET_MOUSE_ENTERED:
  33     case ET_MOUSE_EXITED:
  34       event.reset(new MouseEvent(native_event));
  35       break;
  36
  37     case ET_MOUSEWHEEL:
  38       event.reset(new MouseWheelEvent(native_event));
  39       break;
  40
  41     case ET_SCROLL_FLING_START:
  42     case ET_SCROLL_FLING_CANCEL:
  43     case ET_SCROLL:
  44       event.reset(new ScrollEvent(native_event));
  45       break;
  46
  47     case ET_TOUCH_RELEASED:
  48     case ET_TOUCH_PRESSED:
  49     case ET_TOUCH_MOVED:
  50     case ET_TOUCH_CANCELLED:
  51       event.reset(new TouchEvent(native_event));
  52       break;
  53
  54     default:
  55       break;
  56   }
  57   return event.Pass();
  58 }
  59
  60 int RegisterCustomEventType() {
  61   return ++g_custom_event_types;
  62 }
  63
  64 base::TimeDelta EventTimeForNow() {
  65   return base::TimeDelta::FromInternalValue(
  66       base::TimeTicks::Now().ToInternalValue());
  67 }
  68
  69 bool ShouldDefaultToNaturalScroll() {
  70   return GetInternalDisplayTouchSupport() ==
  71       gfx::Display::TOUCH_SUPPORT_AVAILABLE;
  72 }
  73
  74 gfx::Display::TouchSupport GetInternalDisplayTouchSupport() {
  75   gfx::Screen* screen = gfx::Screen::GetScreenByType(gfx::SCREEN_TYPE_NATIVE);
  76   // No screen in some unit tests.
  77   if (!screen)
  78     return gfx::Display::TOUCH_SUPPORT_UNKNOWN;
  79   const std::vector<gfx::Display>& displays = screen->GetAllDisplays();
  80   for (std::vector<gfx::Display>::const_iterator it = displays.begin();
  81        it != displays.end(); ++it) {
  82     if (it->IsInternal())
  83       return it->touch_support();
  84   }
  85   return gfx::Display::TOUCH_SUPPORT_UNAVAILABLE;
  86 }
  87
  88 }  // namespace ui