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 CommandLine& command_line = *CommandLine::ForCurrentProcess();
  16   const std::string touch_enabled_switch =
  17       command_line.HasSwitch(switches::kTouchEvents) ?
  18       command_line.GetSwitchValueASCII(switches::kTouchEvents) :
  19       switches::kTouchEventsAuto;
  20
  21   if (touch_enabled_switch.empty() ||
  22       touch_enabled_switch == switches::kTouchEventsEnabled)
  23     return true;
  24   if (touch_enabled_switch == switches::kTouchEventsAuto)
  25     return IsTouchDevicePresent();
  26   if (touch_enabled_switch != switches::kTouchEventsDisabled)
  27     LOG(ERROR) << "Invalid --touch-events option: " << touch_enabled_switch;
  28   return false;
  29 }
  30
  31 }  // namespace ui