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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));
     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:
     67 base::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 
    111 int RegisterCustomEventType() {
    112   return ++g_custom_event_types;
    113 }
    114 
    115 base::TimeDelta EventTimeForNow() {
    116   return base::TimeDelta::FromInternalValue(
    117       base::TimeTicks::Now().ToInternalValue());
    118 }
    119 
    120 bool ShouldDefaultToNaturalScroll() {
    121   return GetInternalDisplayTouchSupport() ==
    122       gfx::Display::TOUCH_SUPPORT_AVAILABLE;
    123 }
    124 
    125 gfx::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