ui/events/x/events_x.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_constants.h"
   6
   7 #include <string.h>
   8 #include <X11/extensions/XInput.h>
   9 #include <X11/extensions/XInput2.h>
  10 #include <X11/XKBlib.h>
  11 #include <X11/Xlib.h>
  12 #include <X11/Xutil.h>
  13 #include <cmath>
  14
  15 #include "base/logging.h"
  16 #include "base/memory/singleton.h"
  17 #include "ui/events/devices/x11/device_data_manager_x11.h"
  18 #include "ui/events/devices/x11/device_list_cache_x11.h"
  19 #include "ui/events/devices/x11/touch_factory_x11.h"
  20 #include "ui/events/event.h"
  21 #include "ui/events/event_utils.h"
  22 #include "ui/events/keycodes/keyboard_code_conversion_x.h"
  23 #include "ui/gfx/display.h"
  24 #include "ui/gfx/geometry/point.h"
  25 #include "ui/gfx/geometry/rect.h"
  26 #include "ui/gfx/screen.h"
  27 #include "ui/gfx/x/x11_atom_cache.h"
  28 #include "ui/gfx/x/x11_types.h"
  29
  30 namespace {
  31
  32 // Scroll amount for each wheelscroll event. 53 is also the value used for GTK+.
  33 const int kWheelScrollAmount = 53;
  34
  35 const int kMinWheelButton = 4;
  36 const int kMaxWheelButton = 7;
  37
  38 // A class to track current modifier state on master device. Only track ctrl,
  39 // alt, shift and caps lock keys currently. The tracked state can then be used
  40 // by floating device.
  41 class XModifierStateWatcher{
  42  public:
  43   static XModifierStateWatcher* GetInstance() {
  44     return base::Singleton<XModifierStateWatcher>::get();
  45   }
  46
  47   int StateFromKeyboardCode(ui::KeyboardCode keyboard_code) {
  48     switch (keyboard_code) {
  49       case ui::VKEY_CONTROL:
  50         return ControlMask;
  51       case ui::VKEY_SHIFT:
  52         return ShiftMask;
  53       case ui::VKEY_MENU:
  54         return Mod1Mask;
  55       case ui::VKEY_CAPITAL:
  56         return LockMask;
  57       default:
  58         return 0;
  59     }
  60   }
  61
  62   void UpdateStateFromXEvent(const base::NativeEvent& native_event) {
  63     ui::KeyboardCode keyboard_code = ui::KeyboardCodeFromNative(native_event);
  64     unsigned int mask = StateFromKeyboardCode(keyboard_code);
  65     // Floating device can't access the modifer state from master device.
  66     // We need to track the states of modifier keys in a singleton for
  67     // floating devices such as touch screen. Issue 106426 is one example
  68     // of why we need the modifier states for floating device.
  69     switch (native_event->type) {
  70       case KeyPress:
  71         state_ = native_event->xkey.state | mask;
  72         break;
  73       case KeyRelease:
  74         state_ = native_event->xkey.state & ~mask;
  75         break;
  76       case GenericEvent: {
  77         XIDeviceEvent* xievent =
  78             static_cast<XIDeviceEvent*>(native_event->xcookie.data);
  79         switch (xievent->evtype) {
  80           case XI_KeyPress:
  81             state_ = xievent->mods.effective |= mask;
  82             break;
  83           case XI_KeyRelease:
  84             state_ = xievent->mods.effective &= ~mask;
  85             break;
  86           default:
  87             NOTREACHED();
  88             break;
  89         }
  90         break;
  91       }
  92       default:
  93         NOTREACHED();
  94         break;
  95     }
  96   }
  97
  98   // Returns the current modifer state in master device. It only contains the
  99   // state of ctrl, shift, alt and caps lock keys.
 100   unsigned int state() { return state_; }
 101
 102  private:
 103   friend struct base::DefaultSingletonTraits<XModifierStateWatcher>;
 104
 105   XModifierStateWatcher() : state_(0) { }
 106
 107   unsigned int state_;
 108
 109   DISALLOW_COPY_AND_ASSIGN(XModifierStateWatcher);
 110 };
 111
 112 // Detects if a touch event is a driver-generated 'special event'.
 113 // A 'special event' is a touch event with maximum radius and pressure at
 114 // location (0, 0).
 115 // This needs to be done in a cleaner way: http://crbug.com/169256
 116 bool TouchEventIsGeneratedHack(const base::NativeEvent& native_event) {
 117   XIDeviceEvent* event =
 118       static_cast<XIDeviceEvent*>(native_event->xcookie.data);
 119   CHECK(event->evtype == XI_TouchBegin ||
 120         event->evtype == XI_TouchUpdate ||
 121         event->evtype == XI_TouchEnd);
 122
 123   // Force is normalized to [0, 1].
 124   if (ui::GetTouchForce(native_event) < 1.0f)
 125     return false;
 126
 127   if (ui::EventLocationFromNative(native_event) != gfx::Point())
 128     return false;
 129
 130   // Radius is in pixels, and the valuator is the diameter in pixels.
 131   double radius = ui::GetTouchRadiusX(native_event), min, max;
 132   unsigned int deviceid =
 133       static_cast<XIDeviceEvent*>(native_event->xcookie.data)->sourceid;
 134   if (!ui::DeviceDataManagerX11::GetInstance()->GetDataRange(
 135       deviceid, ui::DeviceDataManagerX11::DT_TOUCH_MAJOR, &min, &max)) {
 136     return false;
 137   }
 138
 139   return radius * 2 == max;
 140 }
 141
 142 int GetEventFlagsFromXState(unsigned int state) {
 143   int flags = 0;
 144   if (state & ControlMask)
 145     flags |= ui::EF_CONTROL_DOWN;
 146   if (state & ShiftMask)
 147     flags |= ui::EF_SHIFT_DOWN;
 148   if (state & Mod1Mask)
 149     flags |= ui::EF_ALT_DOWN;
 150   if (state & LockMask)
 151     flags |= ui::EF_CAPS_LOCK_DOWN;
 152   if (state & Mod3Mask)
 153     flags |= ui::EF_MOD3_DOWN;
 154   if (state & Mod4Mask)
 155     flags |= ui::EF_COMMAND_DOWN;
 156   if (state & Mod5Mask)
 157     flags |= ui::EF_ALTGR_DOWN;
 158   if (state & Button1Mask)
 159     flags |= ui::EF_LEFT_MOUSE_BUTTON;
 160   if (state & Button2Mask)
 161     flags |= ui::EF_MIDDLE_MOUSE_BUTTON;
 162   if (state & Button3Mask)
 163     flags |= ui::EF_RIGHT_MOUSE_BUTTON;
 164   // There are no masks for EF_BACK_MOUSE_BUTTON and
 165   // EF_FORWARD_MOUSE_BUTTON.
 166   return flags;
 167 }
 168
 169 int GetEventFlagsFromXKeyEvent(XEvent* xevent) {
 170   DCHECK(xevent->type == KeyPress || xevent->type == KeyRelease);
 171
 172 #if defined(OS_CHROMEOS)
 173   const int ime_fabricated_flag = 0;
 174 #else
 175   // XIM fabricates key events for the character compositions by XK_Multi_key.
 176   // For example, when a user hits XK_Multi_key, XK_apostrophe, and XK_e in
 177   // order to input "é", then XIM generates a key event with keycode=0 and
 178   // state=0 for the composition, and the sequence of X11 key events will be
 179   // XK_Multi_key, XK_apostrophe, **NoSymbol**, and XK_e.  If the user used
 180   // shift key and/or caps lock key, state can be ShiftMask, LockMask or both.
 181   //
 182   // We have to send these fabricated key events to XIM so it can correctly
 183   // handle the character compositions.
 184   const unsigned int shift_lock_mask = ShiftMask | LockMask;
 185   const bool fabricated_by_xim =
 186       xevent->xkey.keycode == 0 &&
 187       (xevent->xkey.state & ~shift_lock_mask) == 0;
 188   const int ime_fabricated_flag =
 189       fabricated_by_xim ? ui::EF_IME_FABRICATED_KEY : 0;
 190 #endif
 191
 192   return GetEventFlagsFromXState(xevent->xkey.state) |
 193       (xevent->xkey.send_event ? ui::EF_FINAL : 0) |
 194       ime_fabricated_flag;
 195 }
 196
 197 int GetEventFlagsFromXGenericEvent(XEvent* xevent) {
 198   DCHECK(xevent->type == GenericEvent);
 199   XIDeviceEvent* xievent = static_cast<XIDeviceEvent*>(xevent->xcookie.data);
 200   DCHECK((xievent->evtype == XI_KeyPress) ||
 201          (xievent->evtype == XI_KeyRelease));
 202   return GetEventFlagsFromXState(xievent->mods.effective) |
 203          (xevent->xkey.send_event ? ui::EF_FINAL : 0);
 204 }
 205
 206 // Get the event flag for the button in XButtonEvent. During a ButtonPress
 207 // event, |state| in XButtonEvent does not include the button that has just been
 208 // pressed. Instead |state| contains flags for the buttons (if any) that had
 209 // already been pressed before the current button, and |button| stores the most
 210 // current pressed button. So, if you press down left mouse button, and while
 211 // pressing it down, press down the right mouse button, then for the latter
 212 // event, |state| would have Button1Mask set but not Button3Mask, and |button|
 213 // would be 3.
 214 int GetEventFlagsForButton(int button) {
 215   switch (button) {
 216     case 1:
 217       return ui::EF_LEFT_MOUSE_BUTTON;
 218     case 2:
 219       return ui::EF_MIDDLE_MOUSE_BUTTON;
 220     case 3:
 221       return ui::EF_RIGHT_MOUSE_BUTTON;
 222     case 8:
 223       return ui::EF_BACK_MOUSE_BUTTON;
 224     case 9:
 225       return ui::EF_FORWARD_MOUSE_BUTTON;
 226     default:
 227       return 0;
 228   }
 229 }
 230
 231 int GetButtonMaskForX2Event(XIDeviceEvent* xievent) {
 232   int buttonflags = 0;
 233   for (int i = 0; i < 8 * xievent->buttons.mask_len; i++) {
 234     if (XIMaskIsSet(xievent->buttons.mask, i)) {
 235       int button = (xievent->sourceid == xievent->deviceid) ?
 236           ui::DeviceDataManagerX11::GetInstance()->GetMappedButton(i) : i;
 237       buttonflags |= GetEventFlagsForButton(button);
 238     }
 239   }
 240   return buttonflags;
 241 }
 242
 243 ui::EventType GetTouchEventType(const base::NativeEvent& native_event) {
 244   XIDeviceEvent* event =
 245       static_cast<XIDeviceEvent*>(native_event->xcookie.data);
 246   switch(event->evtype) {
 247     case XI_TouchBegin:
 248       return TouchEventIsGeneratedHack(native_event) ? ui::ET_UNKNOWN :
 249                                                        ui::ET_TOUCH_PRESSED;
 250     case XI_TouchUpdate:
 251       return TouchEventIsGeneratedHack(native_event) ? ui::ET_UNKNOWN :
 252                                                        ui::ET_TOUCH_MOVED;
 253     case XI_TouchEnd:
 254       return TouchEventIsGeneratedHack(native_event) ? ui::ET_TOUCH_CANCELLED :
 255                                                        ui::ET_TOUCH_RELEASED;
 256   }
 257
 258   DCHECK(ui::TouchFactory::GetInstance()->IsTouchDevice(event->sourceid));
 259   switch (event->evtype) {
 260     case XI_ButtonPress:
 261       return ui::ET_TOUCH_PRESSED;
 262     case XI_ButtonRelease:
 263       return ui::ET_TOUCH_RELEASED;
 264     case XI_Motion:
 265       // Should not convert any emulated Motion event from touch device to
 266       // touch event.
 267       if (!(event->flags & XIPointerEmulated) &&
 268           GetButtonMaskForX2Event(event))
 269         return ui::ET_TOUCH_MOVED;
 270       return ui::ET_UNKNOWN;
 271     default:
 272       NOTREACHED();
 273   }
 274   return ui::ET_UNKNOWN;
 275 }
 276
 277 double GetTouchParamFromXEvent(XEvent* xev,
 278                               ui::DeviceDataManagerX11::DataType val,
 279                               double default_value) {
 280   ui::DeviceDataManagerX11::GetInstance()->GetEventData(
 281       *xev, val, &default_value);
 282   return default_value;
 283 }
 284
 285 void ScaleTouchRadius(XEvent* xev, double* radius) {
 286   DCHECK_EQ(GenericEvent, xev->type);
 287   XIDeviceEvent* xiev = static_cast<XIDeviceEvent*>(xev->xcookie.data);
 288   ui::DeviceDataManagerX11::GetInstance()->ApplyTouchRadiusScale(
 289       xiev->sourceid, radius);
 290 }
 291
 292 unsigned int UpdateX11EventFlags(int ui_flags, unsigned int old_x_flags) {
 293   static struct {
 294     int ui;
 295     int x;
 296   } flags[] = {
 297     {ui::EF_CONTROL_DOWN, ControlMask},
 298     {ui::EF_SHIFT_DOWN, ShiftMask},
 299     {ui::EF_ALT_DOWN, Mod1Mask},
 300     {ui::EF_CAPS_LOCK_DOWN, LockMask},
 301     {ui::EF_ALTGR_DOWN, Mod5Mask},
 302     {ui::EF_COMMAND_DOWN, Mod4Mask},
 303     {ui::EF_MOD3_DOWN, Mod3Mask},
 304     {ui::EF_LEFT_MOUSE_BUTTON, Button1Mask},
 305     {ui::EF_MIDDLE_MOUSE_BUTTON, Button2Mask},
 306     {ui::EF_RIGHT_MOUSE_BUTTON, Button3Mask},
 307   };
 308   unsigned int new_x_flags = old_x_flags;
 309   for (size_t i = 0; i < arraysize(flags); ++i) {
 310     if (ui_flags & flags[i].ui)
 311       new_x_flags |= flags[i].x;
 312     else
 313       new_x_flags &= ~flags[i].x;
 314   }
 315   return new_x_flags;
 316 }
 317
 318 unsigned int UpdateX11EventButton(int ui_flag, unsigned int old_x_button) {
 319   switch (ui_flag) {
 320     case ui::EF_LEFT_MOUSE_BUTTON:
 321       return Button1;
 322     case ui::EF_MIDDLE_MOUSE_BUTTON:
 323       return Button2;
 324     case ui::EF_RIGHT_MOUSE_BUTTON:
 325       return Button3;
 326     default:
 327       return old_x_button;
 328   }
 329   NOTREACHED();
 330 }
 331
 332 bool GetGestureTimes(const base::NativeEvent& native_event,
 333                      double* start_time,
 334                      double* end_time) {
 335   if (!ui::DeviceDataManagerX11::GetInstance()->HasGestureTimes(native_event))
 336     return false;
 337
 338   double start_time_, end_time_;
 339   if (!start_time)
 340     start_time = &start_time_;
 341   if (!end_time)
 342     end_time = &end_time_;
 343
 344   ui::DeviceDataManagerX11::GetInstance()->GetGestureTimes(
 345       native_event, start_time, end_time);
 346   return true;
 347 }
 348
 349 }  // namespace
 350
 351 namespace ui {
 352
 353 void UpdateDeviceList() {
 354   XDisplay* display = gfx::GetXDisplay();
 355   DeviceListCacheX11::GetInstance()->UpdateDeviceList(display);
 356   TouchFactory::GetInstance()->UpdateDeviceList(display);
 357   DeviceDataManagerX11::GetInstance()->UpdateDeviceList(display);
 358 }
 359
 360 EventType EventTypeFromNative(const base::NativeEvent& native_event) {
 361   // Allow the DeviceDataManager to block the event. If blocked return
 362   // ET_UNKNOWN as the type so this event will not be further processed.
 363   // NOTE: During some events unittests there is no device data manager.
 364   if (DeviceDataManager::HasInstance() &&
 365       static_cast<DeviceDataManagerX11*>(DeviceDataManager::GetInstance())->
 366           IsEventBlocked(native_event)) {
 367     return ET_UNKNOWN;
 368   }
 369
 370   switch (native_event->type) {
 371     case KeyPress:
 372       return ET_KEY_PRESSED;
 373     case KeyRelease:
 374       return ET_KEY_RELEASED;
 375     case ButtonPress:
 376       if (static_cast<int>(native_event->xbutton.button) >= kMinWheelButton &&
 377           static_cast<int>(native_event->xbutton.button) <= kMaxWheelButton)
 378         return ET_MOUSEWHEEL;
 379       return ET_MOUSE_PRESSED;
 380     case ButtonRelease:
 381       // Drop wheel events; we should've already scrolled on the press.
 382       if (static_cast<int>(native_event->xbutton.button) >= kMinWheelButton &&
 383           static_cast<int>(native_event->xbutton.button) <= kMaxWheelButton)
 384         return ET_UNKNOWN;
 385       return ET_MOUSE_RELEASED;
 386     case MotionNotify:
 387       if (native_event->xmotion.state &
 388           (Button1Mask | Button2Mask | Button3Mask))
 389         return ET_MOUSE_DRAGGED;
 390       return ET_MOUSE_MOVED;
 391     case EnterNotify:
 392       // The standard on Windows is to send a MouseMove event when the mouse
 393       // first enters a window instead of sending a special mouse enter event.
 394       // To be consistent we follow the same style.
 395       return ET_MOUSE_MOVED;
 396     case LeaveNotify:
 397       return ET_MOUSE_EXITED;
 398     case GenericEvent: {
 399       TouchFactory* factory = TouchFactory::GetInstance();
 400       if (!factory->ShouldProcessXI2Event(native_event))
 401         return ET_UNKNOWN;
 402
 403       XIDeviceEvent* xievent =
 404           static_cast<XIDeviceEvent*>(native_event->xcookie.data);
 405
 406       // This check works only for master and floating slave devices. That is
 407       // why it is necessary to check for the XI_Touch* events in the following
 408       // switch statement to account for attached-slave touchscreens.
 409       if (factory->IsTouchDevice(xievent->sourceid))
 410         return GetTouchEventType(native_event);
 411
 412       switch (xievent->evtype) {
 413         case XI_TouchBegin:
 414           return ui::ET_TOUCH_PRESSED;
 415         case XI_TouchUpdate:
 416           return ui::ET_TOUCH_MOVED;
 417         case XI_TouchEnd:
 418           return ui::ET_TOUCH_RELEASED;
 419         case XI_ButtonPress: {
 420           int button = EventButtonFromNative(native_event);
 421           if (button >= kMinWheelButton && button <= kMaxWheelButton)
 422             return ET_MOUSEWHEEL;
 423           return ET_MOUSE_PRESSED;
 424         }
 425         case XI_ButtonRelease: {
 426           int button = EventButtonFromNative(native_event);
 427           // Drop wheel events; we should've already scrolled on the press.
 428           if (button >= kMinWheelButton && button <= kMaxWheelButton)
 429             return ET_UNKNOWN;
 430           return ET_MOUSE_RELEASED;
 431         }
 432         case XI_Motion: {
 433           bool is_cancel;
 434           DeviceDataManagerX11* devices = DeviceDataManagerX11::GetInstance();
 435           if (GetFlingData(native_event, NULL, NULL, NULL, NULL, &is_cancel))
 436             return is_cancel ? ET_SCROLL_FLING_CANCEL : ET_SCROLL_FLING_START;
 437           if (devices->IsScrollEvent(native_event)) {
 438             return devices->IsTouchpadXInputEvent(native_event) ? ET_SCROLL
 439                                                                 : ET_MOUSEWHEEL;
 440           }
 441           if (devices->IsCMTMetricsEvent(native_event))
 442             return ET_UMA_DATA;
 443           if (GetButtonMaskForX2Event(xievent))
 444             return ET_MOUSE_DRAGGED;
 445           if (DeviceDataManagerX11::GetInstance()->HasEventData(
 446                   xievent, DeviceDataManagerX11::DT_CMT_SCROLL_X) ||
 447               DeviceDataManagerX11::GetInstance()->HasEventData(
 448                   xievent, DeviceDataManagerX11::DT_CMT_SCROLL_Y)) {
 449             // Don't produce mouse move events for mousewheel scrolls.
 450             return ET_UNKNOWN;
 451           }
 452
 453           return ET_MOUSE_MOVED;
 454         }
 455         case XI_KeyPress:
 456           return ET_KEY_PRESSED;
 457         case XI_KeyRelease:
 458           return ET_KEY_RELEASED;
 459       }
 460     }
 461     default:
 462       break;
 463   }
 464   return ET_UNKNOWN;
 465 }
 466
 467 int EventFlagsFromNative(const base::NativeEvent& native_event) {
 468   switch (native_event->type) {
 469     case KeyPress:
 470     case KeyRelease: {
 471       XModifierStateWatcher::GetInstance()->UpdateStateFromXEvent(native_event);
 472       return GetEventFlagsFromXKeyEvent(native_event);
 473     }
 474     case ButtonPress:
 475     case ButtonRelease: {
 476       int flags = GetEventFlagsFromXState(native_event->xbutton.state);
 477       const EventType type = EventTypeFromNative(native_event);
 478       if (type == ET_MOUSE_PRESSED || type == ET_MOUSE_RELEASED)
 479         flags |= GetEventFlagsForButton(native_event->xbutton.button);
 480       return flags;
 481     }
 482     case EnterNotify:
 483     case LeaveNotify:
 484       return GetEventFlagsFromXState(native_event->xcrossing.state);
 485     case MotionNotify:
 486       return GetEventFlagsFromXState(native_event->xmotion.state);
 487     case GenericEvent: {
 488       XIDeviceEvent* xievent =
 489           static_cast<XIDeviceEvent*>(native_event->xcookie.data);
 490
 491       switch (xievent->evtype) {
 492         case XI_TouchBegin:
 493         case XI_TouchUpdate:
 494         case XI_TouchEnd:
 495           return GetButtonMaskForX2Event(xievent) |
 496                  GetEventFlagsFromXState(xievent->mods.effective) |
 497                  GetEventFlagsFromXState(
 498                      XModifierStateWatcher::GetInstance()->state());
 499           break;
 500         case XI_ButtonPress:
 501         case XI_ButtonRelease: {
 502           const bool touch =
 503               TouchFactory::GetInstance()->IsTouchDevice(xievent->sourceid);
 504           int flags = GetButtonMaskForX2Event(xievent) |
 505                       GetEventFlagsFromXState(xievent->mods.effective);
 506           if (touch) {
 507             flags |= GetEventFlagsFromXState(
 508                 XModifierStateWatcher::GetInstance()->state());
 509           }
 510
 511           const EventType type = EventTypeFromNative(native_event);
 512           int button = EventButtonFromNative(native_event);
 513           if ((type == ET_MOUSE_PRESSED || type == ET_MOUSE_RELEASED) && !touch)
 514             flags |= GetEventFlagsForButton(button);
 515           return flags;
 516         }
 517         case XI_Motion:
 518           return GetButtonMaskForX2Event(xievent) |
 519                  GetEventFlagsFromXState(xievent->mods.effective);
 520         case XI_KeyPress:
 521         case XI_KeyRelease: {
 522           XModifierStateWatcher::GetInstance()->UpdateStateFromXEvent(
 523               native_event);
 524           return GetEventFlagsFromXGenericEvent(native_event);
 525         }
 526       }
 527     }
 528   }
 529   return 0;
 530 }
 531
 532 base::TimeDelta EventTimeFromNative(const base::NativeEvent& native_event) {
 533   switch(native_event->type) {
 534     case KeyPress:
 535     case KeyRelease:
 536       return base::TimeDelta::FromMilliseconds(native_event->xkey.time);
 537     case ButtonPress:
 538     case ButtonRelease:
 539       return base::TimeDelta::FromMilliseconds(native_event->xbutton.time);
 540       break;
 541     case MotionNotify:
 542       return base::TimeDelta::FromMilliseconds(native_event->xmotion.time);
 543       break;
 544     case EnterNotify:
 545     case LeaveNotify:
 546       return base::TimeDelta::FromMilliseconds(native_event->xcrossing.time);
 547       break;
 548     case GenericEvent: {
 549       double start, end;
 550       double touch_timestamp;
 551       if (GetGestureTimes(native_event, &start, &end)) {
 552         // If the driver supports gesture times, use them.
 553         return base::TimeDelta::FromMicroseconds(end * 1000000);
 554       } else if (DeviceDataManagerX11::GetInstance()->GetEventData(
 555           *native_event,
 556           DeviceDataManagerX11::DT_TOUCH_RAW_TIMESTAMP,
 557           &touch_timestamp)) {
 558         return base::TimeDelta::FromMicroseconds(touch_timestamp * 1000000);
 559       } else {
 560         XIDeviceEvent* xide =
 561             static_cast<XIDeviceEvent*>(native_event->xcookie.data);
 562         return base::TimeDelta::FromMilliseconds(xide->time);
 563       }
 564       break;
 565     }
 566   }
 567   NOTREACHED();
 568   return base::TimeDelta();
 569 }
 570
 571 gfx::Point EventLocationFromNative(const base::NativeEvent& native_event) {
 572   switch (native_event->type) {
 573     case EnterNotify:
 574     case LeaveNotify:
 575       return gfx::Point(native_event->xcrossing.x, native_event->xcrossing.y);
 576     case ButtonPress:
 577     case ButtonRelease:
 578       return gfx::Point(native_event->xbutton.x, native_event->xbutton.y);
 579     case MotionNotify:
 580       return gfx::Point(native_event->xmotion.x, native_event->xmotion.y);
 581     case GenericEvent: {
 582       XIDeviceEvent* xievent =
 583           static_cast<XIDeviceEvent*>(native_event->xcookie.data);
 584       float x = xievent->event_x;
 585       float y = xievent->event_y;
 586 #if defined(OS_CHROMEOS)
 587       switch (xievent->evtype) {
 588         case XI_TouchBegin:
 589         case XI_TouchUpdate:
 590         case XI_TouchEnd:
 591           ui::DeviceDataManagerX11::GetInstance()->ApplyTouchTransformer(
 592               xievent->deviceid, &x, &y);
 593           break;
 594         default:
 595           break;
 596       }
 597 #endif  // defined(OS_CHROMEOS)
 598       return gfx::Point(static_cast<int>(x), static_cast<int>(y));
 599     }
 600   }
 601   return gfx::Point();
 602 }
 603
 604 gfx::Point EventSystemLocationFromNative(
 605     const base::NativeEvent& native_event) {
 606   switch (native_event->type) {
 607     case EnterNotify:
 608     case LeaveNotify: {
 609       return gfx::Point(native_event->xcrossing.x_root,
 610                         native_event->xcrossing.y_root);
 611     }
 612     case ButtonPress:
 613     case ButtonRelease: {
 614       return gfx::Point(native_event->xbutton.x_root,
 615                         native_event->xbutton.y_root);
 616     }
 617     case MotionNotify: {
 618       return gfx::Point(native_event->xmotion.x_root,
 619                         native_event->xmotion.y_root);
 620     }
 621     case GenericEvent: {
 622       XIDeviceEvent* xievent =
 623           static_cast<XIDeviceEvent*>(native_event->xcookie.data);
 624       return gfx::Point(xievent->root_x, xievent->root_y);
 625     }
 626   }
 627
 628   return gfx::Point();
 629 }
 630
 631 int EventButtonFromNative(const base::NativeEvent& native_event) {
 632   CHECK_EQ(GenericEvent, native_event->type);
 633   XIDeviceEvent* xievent =
 634       static_cast<XIDeviceEvent*>(native_event->xcookie.data);
 635   int button = xievent->detail;
 636
 637   return (xievent->sourceid == xievent->deviceid) ?
 638          DeviceDataManagerX11::GetInstance()->GetMappedButton(button) : button;
 639 }
 640
 641 KeyboardCode KeyboardCodeFromNative(const base::NativeEvent& native_event) {
 642   return KeyboardCodeFromXKeyEvent(native_event);
 643 }
 644
 645 DomCode CodeFromNative(const base::NativeEvent& native_event) {
 646   return CodeFromXEvent(native_event);
 647 }
 648
 649 uint32 PlatformKeycodeFromNative(const base::NativeEvent& native_event) {
 650   XKeyEvent* xkey = NULL;
 651   XEvent xkey_from_xi2;
 652   switch (native_event->type) {
 653     case KeyPress:
 654     case KeyRelease:
 655       xkey = &native_event->xkey;
 656       break;
 657     case GenericEvent: {
 658       XIDeviceEvent* xievent =
 659           static_cast<XIDeviceEvent*>(native_event->xcookie.data);
 660       switch (xievent->evtype) {
 661         case XI_KeyPress:
 662         case XI_KeyRelease:
 663           // Build an XKeyEvent corresponding to the XI2 event,
 664           // so that we can call XLookupString on it.
 665           InitXKeyEventFromXIDeviceEvent(*native_event, &xkey_from_xi2);
 666           xkey = &xkey_from_xi2.xkey;
 667           break;
 668         default:
 669           NOTREACHED();
 670           break;
 671       }
 672       break;
 673     }
 674     default:
 675       NOTREACHED();
 676       break;
 677   }
 678   KeySym keysym = XK_VoidSymbol;
 679   if (xkey)
 680     XLookupString(xkey, NULL, 0, &keysym, NULL);
 681   return keysym;
 682 }
 683
 684 bool IsCharFromNative(const base::NativeEvent& native_event) {
 685   return false;
 686 }
 687
 688 int GetChangedMouseButtonFlagsFromNative(
 689     const base::NativeEvent& native_event) {
 690   switch (native_event->type) {
 691     case ButtonPress:
 692     case ButtonRelease:
 693       return GetEventFlagsForButton(native_event->xbutton.button);
 694     case GenericEvent: {
 695       XIDeviceEvent* xievent =
 696           static_cast<XIDeviceEvent*>(native_event->xcookie.data);
 697       switch (xievent->evtype) {
 698         case XI_ButtonPress:
 699         case XI_ButtonRelease:
 700           return GetEventFlagsForButton(EventButtonFromNative(native_event));
 701         default:
 702           break;
 703       }
 704     }
 705     default:
 706       break;
 707   }
 708   return 0;
 709 }
 710
 711 gfx::Vector2d GetMouseWheelOffset(const base::NativeEvent& native_event) {
 712   float x_offset, y_offset;
 713   if (GetScrollOffsets(
 714       native_event, &x_offset, &y_offset, NULL, NULL, NULL)) {
 715     return gfx::Vector2d(static_cast<int>(x_offset),
 716                          static_cast<int>(y_offset));
 717   }
 718
 719   int button = native_event->type == GenericEvent ?
 720       EventButtonFromNative(native_event) : native_event->xbutton.button;
 721
 722   switch (button) {
 723     case 4:
 724       return gfx::Vector2d(0, kWheelScrollAmount);
 725     case 5:
 726       return gfx::Vector2d(0, -kWheelScrollAmount);
 727     case 6:
 728       return gfx::Vector2d(kWheelScrollAmount, 0);
 729     case 7:
 730       return gfx::Vector2d(-kWheelScrollAmount, 0);
 731     default:
 732       return gfx::Vector2d();
 733   }
 734 }
 735
 736 base::NativeEvent CopyNativeEvent(const base::NativeEvent& event) {
 737   if (!event || event->type == GenericEvent)
 738     return NULL;
 739   XEvent* copy = new XEvent;
 740   *copy = *event;
 741   return copy;
 742 }
 743
 744 void ReleaseCopiedNativeEvent(const base::NativeEvent& event) {
 745   delete event;
 746 }
 747
 748 void ClearTouchIdIfReleased(const base::NativeEvent& xev) {
 749   ui::EventType type = ui::EventTypeFromNative(xev);
 750   if (type == ui::ET_TOUCH_CANCELLED ||
 751       type == ui::ET_TOUCH_RELEASED) {
 752     ui::TouchFactory* factory = ui::TouchFactory::GetInstance();
 753     ui::DeviceDataManagerX11* manager = ui::DeviceDataManagerX11::GetInstance();
 754     double tracking_id;
 755     if (manager->GetEventData(
 756         *xev, ui::DeviceDataManagerX11::DT_TOUCH_TRACKING_ID, &tracking_id)) {
 757       factory->ReleaseSlotForTrackingID(tracking_id);
 758     }
 759   }
 760 }
 761
 762 int GetTouchId(const base::NativeEvent& xev) {
 763   double slot = 0;
 764   ui::DeviceDataManagerX11* manager = ui::DeviceDataManagerX11::GetInstance();
 765   double tracking_id;
 766   if (!manager->GetEventData(
 767       *xev, ui::DeviceDataManagerX11::DT_TOUCH_TRACKING_ID, &tracking_id)) {
 768     LOG(ERROR) << "Could not get the tracking ID for the event. Using 0.";
 769   } else {
 770     ui::TouchFactory* factory = ui::TouchFactory::GetInstance();
 771     slot = factory->GetSlotForTrackingID(tracking_id);
 772   }
 773   return slot;
 774 }
 775
 776 float GetTouchRadiusX(const base::NativeEvent& native_event) {
 777   double radius = GetTouchParamFromXEvent(native_event,
 778       ui::DeviceDataManagerX11::DT_TOUCH_MAJOR, 0.0) / 2.0;
 779   ScaleTouchRadius(native_event, &radius);
 780   return radius;
 781 }
 782
 783 float GetTouchRadiusY(const base::NativeEvent& native_event) {
 784   double radius = GetTouchParamFromXEvent(native_event,
 785       ui::DeviceDataManagerX11::DT_TOUCH_MINOR, 0.0) / 2.0;
 786   ScaleTouchRadius(native_event, &radius);
 787   return radius;
 788 }
 789
 790 float GetTouchAngle(const base::NativeEvent& native_event) {
 791   return GetTouchParamFromXEvent(native_event,
 792       ui::DeviceDataManagerX11::DT_TOUCH_ORIENTATION, 0.0) / 2.0;
 793 }
 794
 795 float GetTouchForce(const base::NativeEvent& native_event) {
 796   double force = 0.0;
 797   force = GetTouchParamFromXEvent(native_event,
 798       ui::DeviceDataManagerX11::DT_TOUCH_PRESSURE, 0.0);
 799   unsigned int deviceid =
 800       static_cast<XIDeviceEvent*>(native_event->xcookie.data)->sourceid;
 801   // Force is normalized to fall into [0, 1]
 802   if (!ui::DeviceDataManagerX11::GetInstance()->NormalizeData(
 803       deviceid, ui::DeviceDataManagerX11::DT_TOUCH_PRESSURE, &force))
 804     force = 0.0;
 805   return force;
 806 }
 807
 808 bool GetScrollOffsets(const base::NativeEvent& native_event,
 809                       float* x_offset,
 810                       float* y_offset,
 811                       float* x_offset_ordinal,
 812                       float* y_offset_ordinal,
 813                       int* finger_count) {
 814   if (!DeviceDataManagerX11::GetInstance()->IsScrollEvent(native_event))
 815     return false;
 816
 817   // Temp values to prevent passing NULLs to DeviceDataManager.
 818   float x_offset_, y_offset_;
 819   float x_offset_ordinal_, y_offset_ordinal_;
 820   int finger_count_;
 821   if (!x_offset)
 822     x_offset = &x_offset_;
 823   if (!y_offset)
 824     y_offset = &y_offset_;
 825   if (!x_offset_ordinal)
 826     x_offset_ordinal = &x_offset_ordinal_;
 827   if (!y_offset_ordinal)
 828     y_offset_ordinal = &y_offset_ordinal_;
 829   if (!finger_count)
 830     finger_count = &finger_count_;
 831
 832   DeviceDataManagerX11::GetInstance()->GetScrollOffsets(
 833       native_event,
 834       x_offset, y_offset,
 835       x_offset_ordinal, y_offset_ordinal,
 836       finger_count);
 837   return true;
 838 }
 839
 840 bool GetFlingData(const base::NativeEvent& native_event,
 841                   float* vx,
 842                   float* vy,
 843                   float* vx_ordinal,
 844                   float* vy_ordinal,
 845                   bool* is_cancel) {
 846   if (!DeviceDataManagerX11::GetInstance()->IsFlingEvent(native_event))
 847     return false;
 848
 849   float vx_, vy_;
 850   float vx_ordinal_, vy_ordinal_;
 851   bool is_cancel_;
 852   if (!vx)
 853     vx = &vx_;
 854   if (!vy)
 855     vy = &vy_;
 856   if (!vx_ordinal)
 857     vx_ordinal = &vx_ordinal_;
 858   if (!vy_ordinal)
 859     vy_ordinal = &vy_ordinal_;
 860   if (!is_cancel)
 861     is_cancel = &is_cancel_;
 862
 863   DeviceDataManagerX11::GetInstance()->GetFlingData(
 864       native_event, vx, vy, vx_ordinal, vy_ordinal, is_cancel);
 865   return true;
 866 }
 867
 868 void UpdateX11EventForFlags(Event* event) {
 869   XEvent* xev = event->native_event();
 870   if (!xev)
 871     return;
 872   switch (xev->type) {
 873     case KeyPress:
 874     case KeyRelease:
 875       xev->xkey.state = UpdateX11EventFlags(event->flags(), xev->xkey.state);
 876       break;
 877     case ButtonPress:
 878     case ButtonRelease:
 879       xev->xbutton.state =
 880           UpdateX11EventFlags(event->flags(), xev->xbutton.state);
 881       break;
 882     case GenericEvent: {
 883       XIDeviceEvent* xievent = static_cast<XIDeviceEvent*>(xev->xcookie.data);
 884       DCHECK(xievent);
 885       xievent->mods.effective =
 886           UpdateX11EventFlags(event->flags(), xievent->mods.effective);
 887       break;
 888     }
 889     default:
 890       break;
 891   }
 892 }
 893
 894 void UpdateX11EventForChangedButtonFlags(MouseEvent* event) {
 895   XEvent* xev = event->native_event();
 896   if (!xev)
 897     return;
 898   switch (xev->type) {
 899     case ButtonPress:
 900     case ButtonRelease:
 901       xev->xbutton.button = UpdateX11EventButton(event->changed_button_flags(),
 902                                                  xev->xbutton.button);
 903       break;
 904     case GenericEvent: {
 905       XIDeviceEvent* xievent = static_cast<XIDeviceEvent*>(xev->xcookie.data);
 906       CHECK(xievent && (xievent->evtype == XI_ButtonPress ||
 907                         xievent->evtype == XI_ButtonRelease));
 908       xievent->detail =
 909           UpdateX11EventButton(event->changed_button_flags(), xievent->detail);
 910       break;
 911     }
 912     default:
 913       break;
 914   }
 915 }
 916
 917 }  // namespace ui