ui/events/devices/x11/device_list_cache_x11.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/devices/x11/device_list_cache_x11.h"
   6
   7 #include <algorithm>
   8
   9 #include "base/memory/singleton.h"
  10 #include "base/message_loop/message_loop.h"
  11 #include "ui/events/devices/x11/device_data_manager_x11.h"
  12
  13 namespace {
  14
  15 bool IsXI2Available() {
  16 #if defined(USE_AURA)
  17   return ui::DeviceDataManagerX11::GetInstance()->IsXInput2Available();
  18 #else
  19   return false;
  20 #endif
  21 }
  22
  23 }
  24
  25 namespace ui {
  26
  27 DeviceListCacheX11::DeviceListCacheX11() {
  28 }
  29
  30 DeviceListCacheX11::~DeviceListCacheX11() {
  31 }
  32
  33 DeviceListCacheX11* DeviceListCacheX11::GetInstance() {
  34   return base::Singleton<DeviceListCacheX11>::get();
  35 }
  36
  37 void DeviceListCacheX11::UpdateDeviceList(Display* display) {
  38   XDeviceList& new_x_dev_list = x_dev_list_;
  39   new_x_dev_list.devices.reset(
  40       XListInputDevices(display, &new_x_dev_list.count));
  41
  42   XIDeviceList& new_xi_dev_list = xi_dev_list_;
  43   new_xi_dev_list.devices.reset(
  44       IsXI2Available()
  45           ? XIQueryDevice(display, XIAllDevices, &new_xi_dev_list.count)
  46           : nullptr);
  47 }
  48
  49 const XDeviceList& DeviceListCacheX11::GetXDeviceList(Display* display) {
  50   XDeviceList& x_dev_list = x_dev_list_;
  51   // Note that the function can be called before any update has taken place.
  52   if (!x_dev_list.devices && !x_dev_list.count)
  53     x_dev_list.devices.reset(XListInputDevices(display, &x_dev_list.count));
  54   return x_dev_list;
  55 }
  56
  57 const XIDeviceList& DeviceListCacheX11::GetXI2DeviceList(Display* display) {
  58   XIDeviceList& xi_dev_list = xi_dev_list_;
  59   if (!xi_dev_list.devices && !xi_dev_list.count) {
  60     xi_dev_list.devices.reset(
  61         XIQueryDevice(display, XIAllDevices, &xi_dev_list.count));
  62   }
  63   return xi_dev_list;
  64 }
  65
  66 }  // namespace ui
  67