ui/events/event_switches.cc

   1 // Copyright 2013 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_switches.h"
   6
   7 namespace switches {
   8
   9 // Enable scroll prediction for scroll update events.
  10 const char kEnableScrollPrediction[] = "enable-scroll-prediction";
  11
  12 // Enable support for touch events.
  13 const char kTouchEvents[] = "touch-events";
  14
  15 // The values the kTouchEvents switch may have, as in --touch-events=disabled.
  16 //   auto: enabled at startup when an attached touchscreen is present.
  17 const char kTouchEventsAuto[] = "auto";
  18 //   enabled: touch events always enabled.
  19 const char kTouchEventsEnabled[] = "enabled";
  20 //   disabled: touch events are disabled.
  21 const char kTouchEventsDisabled[] = "disabled";
  22
  23 // Enable compensation for unstable pinch zoom. Some touch screens display
  24 // significant amount of wobble when moving a finger in a straight line. This
  25 // makes two finger scroll trigger an oscillating pinch zoom. See
  26 // crbug.com/394380 for details.
  27 const char kCompensateForUnstablePinchZoom[] =
  28     "compensate-for-unstable-pinch-zoom";
  29
  30 #if defined(OS_LINUX)
  31 // Tells chrome to interpret events from these devices as touch events. Only
  32 // available with XInput 2 (i.e. X server 1.8 or above). The id's of the
  33 // devices can be retrieved from 'xinput list'.
  34 const char kTouchDevices[] = "touch-devices";
  35 #endif
  36
  37 #if defined(USE_X11) || defined(USE_OZONE)
  38 // Tells Chrome to do additional touch noise filtering. Should only be used if
  39 // the driver level filtering is insufficient.
  40 const char kExtraTouchNoiseFiltering[] = "touch-noise-filtering";
  41
  42 // The calibration factors given as "<left>,<right>,<top>,<bottom>".
  43 const char kTouchCalibration[] = "touch-calibration";
  44 #endif
  45
  46 }  // namespace switches