ui/events/x/events

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This source file includes following definitions.
GetInstance
UpdateStateFromEvent
state
TouchEventIsGeneratedHack
GetEventFlagsFromXState
GetEventFlagsForButton
GetButtonMaskForX2Event
GetTouchEventType
GetTouchParamFromXEvent
UpdateDeviceList
EventTypeFromNative
EventFlagsFromNative
EventTimeFromNative
EventLocationFromNative
EventSystemLocationFromNative
EventButtonFromNative
KeyboardCodeFromNative
CodeFromNative
GetChangedMouseButtonFlagsFromNative
GetMouseWheelOffset
ClearTouchIdIfReleased
GetTouchId
GetTouchRadiusX
GetTouchRadiusY
GetTouchAngle
GetTouchForce
GetScrollOffsets
GetFlingData
GetGestureTimes
IsTouchpadEvent
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "ui/events/event_constants.h"

#include <cmath>
#include <string.h>
#include <X11/extensions/XInput.h>
#include <X11/extensions/XInput2.h>
#include <X11/Xlib.h>

#include "base/logging.h"
#include "base/memory/singleton.h"
#include "base/message_loop/message_pump_x11.h"
#include "ui/events/event_utils.h"
#include "ui/events/keycodes/keyboard_code_conversion_x.h"
#include "ui/events/x/device_data_manager.h"
#include "ui/events/x/device_list_cache_x.h"
#include "ui/events/x/touch_factory_x11.h"
#include "ui/gfx/display.h"
#include "ui/gfx/point.h"
#include "ui/gfx/rect.h"
#include "ui/gfx/screen.h"
#include "ui/gfx/x/x11_atom_cache.h"
#include "ui/gfx/x/x11_types.h"

namespace {

// Scroll amount for each wheelscroll event. 53 is also the value used for GTK+.
const int kWheelScrollAmount = 53;

const int kMinWheelButton = 4;
const int kMaxWheelButton = 7;

// A class to track current modifier state on master device. Only track ctrl,
// alt, shift and caps lock keys currently. The tracked state can then be used
// by floating device.
class XModifierStateWatcher{
 public:
  static XModifierStateWatcher* GetInstance() {
    return Singleton<XModifierStateWatcher>::get();
  }

  void UpdateStateFromEvent(const base::NativeEvent& native_event) {
    // Floating device can't access the modifer state from master device.
    // We need to track the states of modifier keys in a singleton for
    // floating devices such as touch screen. Issue 106426 is one example
    // of why we need the modifier states for floating device.
    state_ = native_event->xkey.state;
    // master_state is the state before key press. We need to track the
    // state after key press for floating device. Currently only ctrl,
    // shift, alt and caps lock keys are tracked.
    ui::KeyboardCode keyboard_code = ui::KeyboardCodeFromNative(native_event);
    unsigned int mask = 0;

    switch (keyboard_code) {
      case ui::VKEY_CONTROL: {
        mask = ControlMask;
        break;
      }
      case ui::VKEY_SHIFT: {
        mask = ShiftMask;
        break;
      }
      case ui::VKEY_MENU: {
        mask = Mod1Mask;
        break;
      }
      case ui::VKEY_CAPITAL: {
        mask = LockMask;
        break;
      }
      default:
        break;
    }

    if (native_event->type == KeyPress)
      state_ |= mask;
    else
      state_ &= ~mask;
  }

  // Returns the current modifer state in master device. It only contains the
  // state of ctrl, shift, alt and caps lock keys.
  unsigned int state() { return state_; }

 private:
  friend struct DefaultSingletonTraits<XModifierStateWatcher>;

  XModifierStateWatcher() : state_(0) { }

  unsigned int state_;

  DISALLOW_COPY_AND_ASSIGN(XModifierStateWatcher);
};

#if defined(USE_XI2_MT)
// Detects if a touch event is a driver-generated 'special event'.
// A 'special event' is a touch event with maximum radius and pressure at
// location (0, 0).
// This needs to be done in a cleaner way: http://crbug.com/169256
bool TouchEventIsGeneratedHack(const base::NativeEvent& native_event) {
  XIDeviceEvent* event =
      static_cast<XIDeviceEvent*>(native_event->xcookie.data);
  CHECK(event->evtype == XI_TouchBegin ||
        event->evtype == XI_TouchUpdate ||
        event->evtype == XI_TouchEnd);

  // Force is normalized to [0, 1].
  if (ui::GetTouchForce(native_event) < 1.0f)
    return false;

  if (ui::EventLocationFromNative(native_event) != gfx::Point())
    return false;

  // Radius is in pixels, and the valuator is the diameter in pixels.
  double radius = ui::GetTouchRadiusX(native_event), min, max;
  unsigned int deviceid =
      static_cast<XIDeviceEvent*>(native_event->xcookie.data)->sourceid;
  if (!ui::DeviceDataManager::GetInstance()->GetDataRange(
      deviceid, ui::DeviceDataManager::DT_TOUCH_MAJOR, &min, &max)) {
    return false;
  }

  return radius * 2 == max;
}
#endif

int GetEventFlagsFromXState(unsigned int state) {
  int flags = 0;
  if (state & ControlMask)
    flags |= ui::EF_CONTROL_DOWN;
  if (state & ShiftMask)
    flags |= ui::EF_SHIFT_DOWN;
  if (state & Mod1Mask)
    flags |= ui::EF_ALT_DOWN;
  if (state & LockMask)
    flags |= ui::EF_CAPS_LOCK_DOWN;
  if (state & Mod5Mask)
    flags |= ui::EF_ALTGR_DOWN;
  if (state & Button1Mask)
    flags |= ui::EF_LEFT_MOUSE_BUTTON;
  if (state & Button2Mask)
    flags |= ui::EF_MIDDLE_MOUSE_BUTTON;
  if (state & Button3Mask)
    flags |= ui::EF_RIGHT_MOUSE_BUTTON;
  return flags;
}

// Get the event flag for the button in XButtonEvent. During a ButtonPress
// event, |state| in XButtonEvent does not include the button that has just been
// pressed. Instead |state| contains flags for the buttons (if any) that had
// already been pressed before the current button, and |button| stores the most
// current pressed button. So, if you press down left mouse button, and while
// pressing it down, press down the right mouse button, then for the latter
// event, |state| would have Button1Mask set but not Button3Mask, and |button|
// would be 3.
int GetEventFlagsForButton(int button) {
  switch (button) {
    case 1:
      return ui::EF_LEFT_MOUSE_BUTTON;
    case 2:
      return ui::EF_MIDDLE_MOUSE_BUTTON;
    case 3:
      return ui::EF_RIGHT_MOUSE_BUTTON;
    default:
      return 0;
  }
}

int GetButtonMaskForX2Event(XIDeviceEvent* xievent) {
  int buttonflags = 0;
  for (int i = 0; i < 8 * xievent->buttons.mask_len; i++) {
    if (XIMaskIsSet(xievent->buttons.mask, i)) {
      int button = (xievent->sourceid == xievent->deviceid) ?
                   ui::DeviceDataManager::GetInstance()->GetMappedButton(i) : i;
      buttonflags |= GetEventFlagsForButton(button);
    }
  }
  return buttonflags;
}

ui::EventType GetTouchEventType(const base::NativeEvent& native_event) {
  XIDeviceEvent* event =
      static_cast<XIDeviceEvent*>(native_event->xcookie.data);
#if defined(USE_XI2_MT)
  switch(event->evtype) {
    case XI_TouchBegin:
      return TouchEventIsGeneratedHack(native_event) ? ui::ET_UNKNOWN :
                                                       ui::ET_TOUCH_PRESSED;
    case XI_TouchUpdate:
      return TouchEventIsGeneratedHack(native_event) ? ui::ET_UNKNOWN :
                                                       ui::ET_TOUCH_MOVED;
    case XI_TouchEnd:
      return TouchEventIsGeneratedHack(native_event) ? ui::ET_TOUCH_CANCELLED :
                                                       ui::ET_TOUCH_RELEASED;
  }
#endif  // defined(USE_XI2_MT)

  DCHECK(ui::TouchFactory::GetInstance()->IsTouchDevice(event->sourceid));
  switch (event->evtype) {
    case XI_ButtonPress:
      return ui::ET_TOUCH_PRESSED;
    case XI_ButtonRelease:
      return ui::ET_TOUCH_RELEASED;
    case XI_Motion:
      // Should not convert any emulated Motion event from touch device to
      // touch event.
      if (!(event->flags & XIPointerEmulated) &&
          GetButtonMaskForX2Event(event))
        return ui::ET_TOUCH_MOVED;
      return ui::ET_UNKNOWN;
    default:
      NOTREACHED();
  }
  return ui::ET_UNKNOWN;
}

double GetTouchParamFromXEvent(XEvent* xev,
                              ui::DeviceDataManager::DataType val,
                              double default_value) {
  ui::DeviceDataManager::GetInstance()->GetEventData(
      *xev, val, &default_value);
  return default_value;
}

}  // namespace

namespace ui {

void UpdateDeviceList() {
  XDisplay* display = gfx::GetXDisplay();
  DeviceListCacheX::GetInstance()->UpdateDeviceList(display);
  TouchFactory::GetInstance()->UpdateDeviceList(display);
  DeviceDataManager::GetInstance()->UpdateDeviceList(display);
}

EventType EventTypeFromNative(const base::NativeEvent& native_event) {
  switch (native_event->type) {
    case KeyPress:
      return ET_KEY_PRESSED;
    case KeyRelease:
      return ET_KEY_RELEASED;
    case ButtonPress:
      if (static_cast<int>(native_event->xbutton.button) >= kMinWheelButton &&
          static_cast<int>(native_event->xbutton.button) <= kMaxWheelButton)
        return ET_MOUSEWHEEL;
      return ET_MOUSE_PRESSED;
    case ButtonRelease:
      // Drop wheel events; we should've already scrolled on the press.
      if (static_cast<int>(native_event->xbutton.button) >= kMinWheelButton &&
          static_cast<int>(native_event->xbutton.button) <= kMaxWheelButton)
        return ET_UNKNOWN;
      return ET_MOUSE_RELEASED;
    case MotionNotify:
      if (native_event->xmotion.state &
          (Button1Mask | Button2Mask | Button3Mask))
        return ET_MOUSE_DRAGGED;
      return ET_MOUSE_MOVED;
    case EnterNotify:
      // The standard on Windows is to send a MouseMove event when the mouse
      // first enters a window instead of sending a special mouse enter event.
      // To be consistent we follow the same style.
      return ET_MOUSE_MOVED;
    case LeaveNotify:
      return ET_MOUSE_EXITED;
    case GenericEvent: {
      TouchFactory* factory = TouchFactory::GetInstance();
      if (!factory->ShouldProcessXI2Event(native_event))
        return ET_UNKNOWN;

      XIDeviceEvent* xievent =
          static_cast<XIDeviceEvent*>(native_event->xcookie.data);

      // This check works only for master and floating slave devices. That is
      // why it is necessary to check for the XI_Touch* events in the following
      // switch statement to account for attached-slave touchscreens.
      if (factory->IsTouchDevice(xievent->sourceid))
        return GetTouchEventType(native_event);

      switch (xievent->evtype) {
        case XI_TouchBegin:
          return ui::ET_TOUCH_PRESSED;
        case XI_TouchUpdate:
          return ui::ET_TOUCH_MOVED;
        case XI_TouchEnd:
          return ui::ET_TOUCH_RELEASED;
        case XI_ButtonPress: {
          int button = EventButtonFromNative(native_event);
          if (button >= kMinWheelButton && button <= kMaxWheelButton)
            return ET_MOUSEWHEEL;
          return ET_MOUSE_PRESSED;
        }
        case XI_ButtonRelease: {
          int button = EventButtonFromNative(native_event);
          // Drop wheel events; we should've already scrolled on the press.
          if (button >= kMinWheelButton && button <= kMaxWheelButton)
            return ET_UNKNOWN;
          return ET_MOUSE_RELEASED;
        }
        case XI_Motion: {
          bool is_cancel;
          if (GetFlingData(native_event, NULL, NULL, NULL, NULL, &is_cancel)) {
            return is_cancel ? ET_SCROLL_FLING_CANCEL : ET_SCROLL_FLING_START;
          } else if (DeviceDataManager::GetInstance()->IsScrollEvent(
              native_event)) {
            return IsTouchpadEvent(native_event) ? ET_SCROLL : ET_MOUSEWHEEL;
          } else if (DeviceDataManager::GetInstance()->IsCMTMetricsEvent(
              native_event)) {
            return ET_UMA_DATA;
          } else if (GetButtonMaskForX2Event(xievent)) {
            return ET_MOUSE_DRAGGED;
          } else {
            return ET_MOUSE_MOVED;
          }
        }
      }
    }
    default:
      break;
  }
  return ET_UNKNOWN;
}

int EventFlagsFromNative(const base::NativeEvent& native_event) {
  switch (native_event->type) {
    case KeyPress:
    case KeyRelease: {
      XModifierStateWatcher::GetInstance()->UpdateStateFromEvent(native_event);
      return GetEventFlagsFromXState(native_event->xkey.state);
    }
    case ButtonPress:
    case ButtonRelease: {
      int flags = GetEventFlagsFromXState(native_event->xbutton.state);
      const EventType type = EventTypeFromNative(native_event);
      if (type == ET_MOUSE_PRESSED || type == ET_MOUSE_RELEASED)
        flags |= GetEventFlagsForButton(native_event->xbutton.button);
      return flags;
    }
    case EnterNotify:
    case LeaveNotify:
      return GetEventFlagsFromXState(native_event->xcrossing.state);
    case MotionNotify:
      return GetEventFlagsFromXState(native_event->xmotion.state);
    case GenericEvent: {
      XIDeviceEvent* xievent =
          static_cast<XIDeviceEvent*>(native_event->xcookie.data);

      switch (xievent->evtype) {
#if defined(USE_XI2_MT)
        case XI_TouchBegin:
        case XI_TouchUpdate:
        case XI_TouchEnd:
          return GetButtonMaskForX2Event(xievent) |
                 GetEventFlagsFromXState(xievent->mods.effective) |
                 GetEventFlagsFromXState(
                     XModifierStateWatcher::GetInstance()->state());
          break;
#endif
        case XI_ButtonPress:
        case XI_ButtonRelease: {
          const bool touch =
              TouchFactory::GetInstance()->IsTouchDevice(xievent->sourceid);
          int flags = GetButtonMaskForX2Event(xievent) |
              GetEventFlagsFromXState(xievent->mods.effective);
          if (touch) {
            flags |= GetEventFlagsFromXState(
                XModifierStateWatcher::GetInstance()->state());
          }

          const EventType type = EventTypeFromNative(native_event);
          int button = EventButtonFromNative(native_event);
          if ((type == ET_MOUSE_PRESSED || type == ET_MOUSE_RELEASED) && !touch)
            flags |= GetEventFlagsForButton(button);
          return flags;
        }
        case XI_Motion:
           return GetButtonMaskForX2Event(xievent) |
                  GetEventFlagsFromXState(xievent->mods.effective);
      }
    }
  }
  return 0;
}

base::TimeDelta EventTimeFromNative(const base::NativeEvent& native_event) {
  switch(native_event->type) {
    case KeyPress:
    case KeyRelease:
      return base::TimeDelta::FromMilliseconds(native_event->xkey.time);
    case ButtonPress:
    case ButtonRelease:
      return base::TimeDelta::FromMilliseconds(native_event->xbutton.time);
      break;
    case MotionNotify:
      return base::TimeDelta::FromMilliseconds(native_event->xmotion.time);
      break;
    case EnterNotify:
    case LeaveNotify:
      return base::TimeDelta::FromMilliseconds(native_event->xcrossing.time);
      break;
    case GenericEvent: {
      double start, end;
      double touch_timestamp;
      if (GetGestureTimes(native_event, &start, &end)) {
        // If the driver supports gesture times, use them.
        return base::TimeDelta::FromMicroseconds(end * 1000000);
      } else if (DeviceDataManager::GetInstance()->GetEventData(*native_event,
                 DeviceDataManager::DT_TOUCH_RAW_TIMESTAMP, &touch_timestamp)) {
        return base::TimeDelta::FromMicroseconds(touch_timestamp * 1000000);
      } else {
        XIDeviceEvent* xide =
            static_cast<XIDeviceEvent*>(native_event->xcookie.data);
        return base::TimeDelta::FromMilliseconds(xide->time);
      }
      break;
    }
  }
  NOTREACHED();
  return base::TimeDelta();
}

gfx::Point EventLocationFromNative(const base::NativeEvent& native_event) {
  switch (native_event->type) {
    case EnterNotify:
    case LeaveNotify:
      return gfx::Point(native_event->xcrossing.x, native_event->xcrossing.y);
    case ButtonPress:
    case ButtonRelease:
      return gfx::Point(native_event->xbutton.x, native_event->xbutton.y);
    case MotionNotify:
      return gfx::Point(native_event->xmotion.x, native_event->xmotion.y);
    case GenericEvent: {
      XIDeviceEvent* xievent =
          static_cast<XIDeviceEvent*>(native_event->xcookie.data);
      return gfx::Point(static_cast<int>(xievent->event_x),
                        static_cast<int>(xievent->event_y));
    }
  }
  return gfx::Point();
}

gfx::Point EventSystemLocationFromNative(
    const base::NativeEvent& native_event) {
  switch (native_event->type) {
    case EnterNotify:
    case LeaveNotify: {
      return gfx::Point(native_event->xcrossing.x_root,
                        native_event->xcrossing.y_root);
    }
    case ButtonPress:
    case ButtonRelease: {
      return gfx::Point(native_event->xbutton.x_root,
                        native_event->xbutton.y_root);
    }
    case MotionNotify: {
      return gfx::Point(native_event->xmotion.x_root,
                        native_event->xmotion.y_root);
    }
    case GenericEvent: {
      XIDeviceEvent* xievent =
          static_cast<XIDeviceEvent*>(native_event->xcookie.data);
      return gfx::Point(xievent->root_x, xievent->root_y);
    }
  }

  return gfx::Point();
}

int EventButtonFromNative(const base::NativeEvent& native_event) {
  CHECK_EQ(GenericEvent, native_event->type);
  XIDeviceEvent* xievent =
      static_cast<XIDeviceEvent*>(native_event->xcookie.data);
  int button = xievent->detail;

  return (xievent->sourceid == xievent->deviceid) ?
         DeviceDataManager::GetInstance()->GetMappedButton(button) : button;
}

KeyboardCode KeyboardCodeFromNative(const base::NativeEvent& native_event) {
  return KeyboardCodeFromXKeyEvent(native_event);
}

const char* CodeFromNative(const base::NativeEvent& native_event) {
  return CodeFromXEvent(native_event);
}

int GetChangedMouseButtonFlagsFromNative(
    const base::NativeEvent& native_event) {
  switch (native_event->type) {
    case ButtonPress:
    case ButtonRelease:
      return GetEventFlagsFromXState(native_event->xbutton.state);
    case GenericEvent: {
      XIDeviceEvent* xievent =
          static_cast<XIDeviceEvent*>(native_event->xcookie.data);
      switch (xievent->evtype) {
        case XI_ButtonPress:
        case XI_ButtonRelease:
          return GetEventFlagsForButton(EventButtonFromNative(native_event));
        default:
          break;
      }
    }
    default:
      break;
  }
  return 0;
}

gfx::Vector2d GetMouseWheelOffset(const base::NativeEvent& native_event) {
  float x_offset, y_offset;
  if (GetScrollOffsets(
      native_event, &x_offset, &y_offset, NULL, NULL, NULL)) {
    return gfx::Vector2d(static_cast<int>(x_offset),
                         static_cast<int>(y_offset));
  }

  int button = native_event->type == GenericEvent ?
      EventButtonFromNative(native_event) : native_event->xbutton.button;

  switch (button) {
    case 4:
      return gfx::Vector2d(0, kWheelScrollAmount);
    case 5:
      return gfx::Vector2d(0, -kWheelScrollAmount);
    case 6:
      return gfx::Vector2d(kWheelScrollAmount, 0);
    case 7:
      return gfx::Vector2d(-kWheelScrollAmount, 0);
    default:
      return gfx::Vector2d();
  }
}

void ClearTouchIdIfReleased(const base::NativeEvent& xev) {
  ui::EventType type = ui::EventTypeFromNative(xev);
  if (type == ui::ET_TOUCH_CANCELLED ||
      type == ui::ET_TOUCH_RELEASED) {
    ui::TouchFactory* factory = ui::TouchFactory::GetInstance();
    ui::DeviceDataManager* manager = ui::DeviceDataManager::GetInstance();
    double tracking_id;
    if (manager->GetEventData(
        *xev, ui::DeviceDataManager::DT_TOUCH_TRACKING_ID, &tracking_id)) {
      factory->ReleaseSlotForTrackingID(tracking_id);
    }
  }
}

int GetTouchId(const base::NativeEvent& xev) {
  double slot = 0;
  ui::DeviceDataManager* manager = ui::DeviceDataManager::GetInstance();
  double tracking_id;
  if (!manager->GetEventData(
      *xev, ui::DeviceDataManager::DT_TOUCH_TRACKING_ID, &tracking_id)) {
    LOG(ERROR) << "Could not get the tracking ID for the event. Using 0.";
  } else {
    ui::TouchFactory* factory = ui::TouchFactory::GetInstance();
    slot = factory->GetSlotForTrackingID(tracking_id);
  }
  return slot;
}

float GetTouchRadiusX(const base::NativeEvent& native_event) {
  return GetTouchParamFromXEvent(native_event,
      ui::DeviceDataManager::DT_TOUCH_MAJOR, 0.0) / 2.0;
}

float GetTouchRadiusY(const base::NativeEvent& native_event) {
  return GetTouchParamFromXEvent(native_event,
      ui::DeviceDataManager::DT_TOUCH_MINOR, 0.0) / 2.0;
}

float GetTouchAngle(const base::NativeEvent& native_event) {
  return GetTouchParamFromXEvent(native_event,
      ui::DeviceDataManager::DT_TOUCH_ORIENTATION, 0.0) / 2.0;
}

float GetTouchForce(const base::NativeEvent& native_event) {
  double force = 0.0;
  force = GetTouchParamFromXEvent(native_event,
      ui::DeviceDataManager::DT_TOUCH_PRESSURE, 0.0);
  unsigned int deviceid =
      static_cast<XIDeviceEvent*>(native_event->xcookie.data)->sourceid;
  // Force is normalized to fall into [0, 1]
  if (!ui::DeviceDataManager::GetInstance()->NormalizeData(
      deviceid, ui::DeviceDataManager::DT_TOUCH_PRESSURE, &force))
    force = 0.0;
  return force;
}

bool GetScrollOffsets(const base::NativeEvent& native_event,
                      float* x_offset,
                      float* y_offset,
                      float* x_offset_ordinal,
                      float* y_offset_ordinal,
                      int* finger_count) {
  if (!DeviceDataManager::GetInstance()->IsScrollEvent(native_event))
    return false;

  // Temp values to prevent passing NULLs to DeviceDataManager.
  float x_offset_, y_offset_;
  float x_offset_ordinal_, y_offset_ordinal_;
  int finger_count_;
  if (!x_offset)
    x_offset = &x_offset_;
  if (!y_offset)
    y_offset = &y_offset_;
  if (!x_offset_ordinal)
    x_offset_ordinal = &x_offset_ordinal_;
  if (!y_offset_ordinal)
    y_offset_ordinal = &y_offset_ordinal_;
  if (!finger_count)
    finger_count = &finger_count_;

  DeviceDataManager::GetInstance()->GetScrollOffsets(
      native_event,
      x_offset, y_offset,
      x_offset_ordinal, y_offset_ordinal,
      finger_count);
  return true;
}

bool GetFlingData(const base::NativeEvent& native_event,
                  float* vx,
                  float* vy,
                  float* vx_ordinal,
                  float* vy_ordinal,
                  bool* is_cancel) {
  if (!DeviceDataManager::GetInstance()->IsFlingEvent(native_event))
    return false;

  float vx_, vy_;
  float vx_ordinal_, vy_ordinal_;
  bool is_cancel_;
  if (!vx)
    vx = &vx_;
  if (!vy)
    vy = &vy_;
  if (!vx_ordinal)
    vx_ordinal = &vx_ordinal_;
  if (!vy_ordinal)
    vy_ordinal = &vy_ordinal_;
  if (!is_cancel)
    is_cancel = &is_cancel_;

  DeviceDataManager::GetInstance()->GetFlingData(
      native_event, vx, vy, vx_ordinal, vy_ordinal, is_cancel);
  return true;
}

bool GetGestureTimes(const base::NativeEvent& native_event,
                     double* start_time,
                     double* end_time) {
  if (!DeviceDataManager::GetInstance()->HasGestureTimes(native_event))
    return false;

  double start_time_, end_time_;
  if (!start_time)
    start_time = &start_time_;
  if (!end_time)
    end_time = &end_time_;

  DeviceDataManager::GetInstance()->GetGestureTimes(
      native_event, start_time, end_time);
  return true;
}

bool IsTouchpadEvent(const base::NativeEvent& event) {
  return DeviceDataManager::GetInstance()->IsTouchpadXInputEvent(event);
}

}  // namespace ui
/* [<][>][^][v][top][bottom][index][help] */
root/ui/events/x/events_x.cc

DEFINITIONS
