ui/base/touch/touch_enabled.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/base/touch/touch_enabled.h"
   6 #include "base/command_line.h"
   7 #include "base/logging.h"
   8 #include "ui/base/touch/touch_device.h"
   9 #include "ui/base/ui_base_switches.h"
  10 #include "ui/events/event_switches.h"
  11
  12 namespace ui {
  13
  14 bool AreTouchEventsEnabled() {
  15   const base::CommandLine& command_line =
  16       *base::CommandLine::ForCurrentProcess();
  17   const std::string touch_enabled_switch =
  18       command_line.HasSwitch(switches::kTouchEvents) ?
  19       command_line.GetSwitchValueASCII(switches::kTouchEvents) :
  20       switches::kTouchEventsAuto;
  21
  22   if (touch_enabled_switch.empty() ||
  23       touch_enabled_switch == switches::kTouchEventsEnabled)
  24     return true;
  25   if (touch_enabled_switch == switches::kTouchEventsAuto)
  26     return IsTouchDevicePresent();
  27   if (touch_enabled_switch != switches::kTouchEventsDisabled)
  28     LOG(ERROR) << "Invalid --touch-events option: " << touch_enabled_switch;
  29   return false;
  30 }
  31
  32 }  // namespace ui