src/mojo/services/html_viewer/blink_input_events_type_converters.cc

   1 // Copyright 2014 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 "mojo/services/html_viewer/blink_input_events_type_converters.h"
   6
   7 #include "base/logging.h"
   8 #include "base/time/time.h"
   9 #include "mojo/services/public/interfaces/input_events/input_event_constants.mojom.h"
  10 #include "third_party/WebKit/public/web/WebInputEvent.h"
  11
  12 namespace mojo {
  13 namespace {
  14
  15 // Used for scrolling. This matches Firefox behavior.
  16 const int kPixelsPerTick = 53;
  17
  18 int EventFlagsToWebEventModifiers(int flags) {
  19   int modifiers = 0;
  20
  21   if (flags & mojo::EVENT_FLAGS_SHIFT_DOWN)
  22     modifiers |= blink::WebInputEvent::ShiftKey;
  23   if (flags & mojo::EVENT_FLAGS_CONTROL_DOWN)
  24     modifiers |= blink::WebInputEvent::ControlKey;
  25   if (flags & mojo::EVENT_FLAGS_ALT_DOWN)
  26     modifiers |= blink::WebInputEvent::AltKey;
  27   // TODO(beng): MetaKey/META_MASK
  28   if (flags & mojo::EVENT_FLAGS_LEFT_MOUSE_BUTTON)
  29     modifiers |= blink::WebInputEvent::LeftButtonDown;
  30   if (flags & mojo::EVENT_FLAGS_MIDDLE_MOUSE_BUTTON)
  31     modifiers |= blink::WebInputEvent::MiddleButtonDown;
  32   if (flags & mojo::EVENT_FLAGS_RIGHT_MOUSE_BUTTON)
  33     modifiers |= blink::WebInputEvent::RightButtonDown;
  34   if (flags & mojo::EVENT_FLAGS_CAPS_LOCK_DOWN)
  35     modifiers |= blink::WebInputEvent::CapsLockOn;
  36   return modifiers;
  37 }
  38
  39 int EventFlagsToWebInputEventModifiers(int flags) {
  40   return
  41       (flags & mojo::EVENT_FLAGS_SHIFT_DOWN ?
  42        blink::WebInputEvent::ShiftKey : 0) |
  43       (flags & mojo::EVENT_FLAGS_CONTROL_DOWN ?
  44        blink::WebInputEvent::ControlKey : 0) |
  45       (flags & mojo::EVENT_FLAGS_CAPS_LOCK_DOWN ?
  46        blink::WebInputEvent::CapsLockOn : 0) |
  47       (flags & mojo::EVENT_FLAGS_ALT_DOWN ?
  48        blink::WebInputEvent::AltKey : 0);
  49 }
  50
  51 int GetClickCount(int flags) {
  52   if (flags & mojo::MOUSE_EVENT_FLAGS_IS_TRIPLE_CLICK)
  53     return 3;
  54   else if (flags & mojo::MOUSE_EVENT_FLAGS_IS_DOUBLE_CLICK)
  55     return 2;
  56
  57   return 1;
  58 }
  59
  60 scoped_ptr<blink::WebInputEvent> BuildWebMouseEventFrom(const EventPtr& event) {
  61   scoped_ptr<blink::WebMouseEvent> web_event(new blink::WebMouseEvent);
  62   web_event->x = event->location_data->in_view_location->x;
  63   web_event->y = event->location_data->in_view_location->y;
  64
  65   // TODO(erg): Remove this if check once we can rely on screen_location
  66   // actually being passed to us. As written today, getting the screen
  67   // location from ui::Event objects can only be done by querying the
  68   // underlying native events, so all synthesized events don't have screen
  69   // locations.
  70   if (!event->location_data->screen_location.is_null()) {
  71     web_event->globalX = event->location_data->screen_location->x;
  72     web_event->globalY = event->location_data->screen_location->y;
  73   }
  74
  75   web_event->modifiers = EventFlagsToWebEventModifiers(event->flags);
  76   web_event->timeStampSeconds =
  77       base::TimeDelta::FromInternalValue(event->time_stamp).InSecondsF();
  78
  79   web_event->button = blink::WebMouseEvent::ButtonNone;
  80   if (event->flags & mojo::EVENT_FLAGS_LEFT_MOUSE_BUTTON)
  81     web_event->button = blink::WebMouseEvent::ButtonLeft;
  82   if (event->flags & mojo::EVENT_FLAGS_MIDDLE_MOUSE_BUTTON)
  83     web_event->button = blink::WebMouseEvent::ButtonMiddle;
  84   if (event->flags & mojo::EVENT_FLAGS_RIGHT_MOUSE_BUTTON)
  85     web_event->button = blink::WebMouseEvent::ButtonRight;
  86
  87   switch (event->action) {
  88     case EVENT_TYPE_MOUSE_PRESSED:
  89       web_event->type = blink::WebInputEvent::MouseDown;
  90       break;
  91     case EVENT_TYPE_MOUSE_RELEASED:
  92       web_event->type = blink::WebInputEvent::MouseUp;
  93       break;
  94     case EVENT_TYPE_MOUSE_ENTERED:
  95       web_event->type = blink::WebInputEvent::MouseLeave;
  96       web_event->button = blink::WebMouseEvent::ButtonNone;
  97       break;
  98     case EVENT_TYPE_MOUSE_EXITED:
  99     case EVENT_TYPE_MOUSE_MOVED:
 100     case EVENT_TYPE_MOUSE_DRAGGED:
 101       web_event->type = blink::WebInputEvent::MouseMove;
 102       break;
 103     default:
 104       NOTIMPLEMENTED() << "Received unexpected event: " << event->action;
 105       break;
 106   }
 107
 108   web_event->clickCount = GetClickCount(event->flags);
 109
 110   return web_event.Pass();
 111 }
 112
 113 scoped_ptr<blink::WebInputEvent> BuildWebKeyboardEvent(
 114     const EventPtr& event) {
 115   scoped_ptr<blink::WebKeyboardEvent> web_event(new blink::WebKeyboardEvent);
 116
 117   web_event->modifiers = EventFlagsToWebInputEventModifiers(event->flags);
 118   web_event->timeStampSeconds =
 119       base::TimeDelta::FromInternalValue(event->time_stamp).InSecondsF();
 120
 121   switch (event->action) {
 122     case EVENT_TYPE_KEY_PRESSED:
 123       web_event->type = event->key_data->is_char ? blink::WebInputEvent::Char :
 124           blink::WebInputEvent::RawKeyDown;
 125       break;
 126     case EVENT_TYPE_KEY_RELEASED:
 127       web_event->type = blink::WebInputEvent::KeyUp;
 128       break;
 129     default:
 130       NOTREACHED();
 131   }
 132
 133   if (web_event->modifiers & blink::WebInputEvent::AltKey)
 134     web_event->isSystemKey = true;
 135
 136   web_event->windowsKeyCode = event->key_data->windows_key_code;
 137   web_event->nativeKeyCode = event->key_data->native_key_code;
 138   web_event->text[0] = event->key_data->text;
 139   web_event->unmodifiedText[0] = event->key_data->unmodified_text;
 140
 141   web_event->setKeyIdentifierFromWindowsKeyCode();
 142   return web_event.Pass();
 143 }
 144
 145 scoped_ptr<blink::WebInputEvent> BuildWebMouseWheelEventFrom(
 146     const EventPtr& event) {
 147   scoped_ptr<blink::WebMouseWheelEvent> web_event(
 148       new blink::WebMouseWheelEvent);
 149   web_event->type = blink::WebInputEvent::MouseWheel;
 150   web_event->button = blink::WebMouseEvent::ButtonNone;
 151   web_event->modifiers = EventFlagsToWebEventModifiers(event->flags);
 152   web_event->timeStampSeconds =
 153       base::TimeDelta::FromInternalValue(event->time_stamp).InSecondsF();
 154
 155   web_event->x = event->location_data->in_view_location->x;
 156   web_event->y = event->location_data->in_view_location->y;
 157
 158   // TODO(erg): Remove this null check as parallel to above.
 159   if (!event->location_data->screen_location.is_null()) {
 160     web_event->globalX = event->location_data->screen_location->x;
 161     web_event->globalY = event->location_data->screen_location->y;
 162   }
 163
 164   if ((event->flags & mojo::EVENT_FLAGS_SHIFT_DOWN) != 0 &&
 165       event->wheel_data->x_offset == 0) {
 166     web_event->deltaX = event->wheel_data->y_offset;
 167     web_event->deltaY = 0;
 168   } else {
 169     web_event->deltaX = event->wheel_data->x_offset;
 170     web_event->deltaY = event->wheel_data->y_offset;
 171   }
 172
 173   web_event->wheelTicksX = web_event->deltaX / kPixelsPerTick;
 174   web_event->wheelTicksY = web_event->deltaY / kPixelsPerTick;
 175
 176   return web_event.Pass();
 177 }
 178
 179 }  // namespace
 180
 181 // static
 182 scoped_ptr<blink::WebInputEvent>
 183 TypeConverter<scoped_ptr<blink::WebInputEvent>, EventPtr>::Convert(
 184     const EventPtr& event) {
 185   if (event->action == EVENT_TYPE_MOUSE_PRESSED ||
 186       event->action == EVENT_TYPE_MOUSE_RELEASED ||
 187       event->action == EVENT_TYPE_MOUSE_ENTERED ||
 188       event->action == EVENT_TYPE_MOUSE_EXITED ||
 189       event->action == EVENT_TYPE_MOUSE_MOVED ||
 190       event->action == EVENT_TYPE_MOUSE_DRAGGED) {
 191     return BuildWebMouseEventFrom(event);
 192   } else if ((event->action == EVENT_TYPE_KEY_PRESSED ||
 193               event->action == EVENT_TYPE_KEY_RELEASED) &&
 194              event->key_data) {
 195     return BuildWebKeyboardEvent(event);
 196   } else if (event->action == EVENT_TYPE_MOUSEWHEEL) {
 197     return BuildWebMouseWheelEventFrom(event);
 198   }
 199
 200   return scoped_ptr<blink::WebInputEvent>();
 201 }
 202
 203 }  // namespace mojo