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      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, false));
     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
     95