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      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/x/device_list_cache_x.h"
      6 
      7 #include <algorithm>
      8 
      9 #include "base/memory/singleton.h"
     10 #include "base/message_loop/message_loop.h"
     11 #include "ui/events/x/device_data_manager.h"
     12 
     13 namespace {
     14 
     15 bool IsXI2Available() {
     16 #if defined(USE_AURA)
     17   return ui::DeviceDataManager::GetInstance()->IsXInput2Available();
     18 #else
     19   return false;
     20 #endif
     21 }
     22 
     23 }
     24 
     25 namespace ui {
     26 
     27 DeviceListCacheX::DeviceListCacheX() {
     28 }
     29 
     30 DeviceListCacheX::~DeviceListCacheX() {
     31   std::map<Display*, XDeviceList>::iterator xp;
     32   for (xp = x_dev_list_map_.begin(); xp != x_dev_list_map_.end(); xp++) {
     33     if (xp->second.devices)
     34       XFreeDeviceList(xp->second.devices);
     35   }
     36   std::map<Display*, XIDeviceList>::iterator xip;
     37   for (xip = xi_dev_list_map_.begin(); xip != xi_dev_list_map_.end(); xip++) {
     38     if (xip->second.devices)
     39       XIFreeDeviceInfo(xip->second.devices);
     40   }
     41 }
     42 
     43 DeviceListCacheX* DeviceListCacheX::GetInstance() {
     44   return Singleton<DeviceListCacheX>::get();
     45 }
     46 
     47 void DeviceListCacheX::UpdateDeviceList(Display* display) {
     48   XDeviceList& new_x_dev_list = x_dev_list_map_[display];
     49   if (new_x_dev_list.devices)
     50     XFreeDeviceList(new_x_dev_list.devices);
     51   new_x_dev_list.devices = XListInputDevices(display, &new_x_dev_list.count);
     52 
     53   XIDeviceList& new_xi_dev_list = xi_dev_list_map_[display];
     54   if (new_xi_dev_list.devices)
     55     XIFreeDeviceInfo(new_xi_dev_list.devices);
     56   new_xi_dev_list.devices = IsXI2Available() ?
     57       XIQueryDevice(display, XIAllDevices, &new_xi_dev_list.count) : NULL;
     58 }
     59 
     60 const XDeviceList& DeviceListCacheX::GetXDeviceList(Display* display) {
     61   XDeviceList& x_dev_list = x_dev_list_map_[display];
     62   // Note that the function can be called before any update has taken place.
     63   if (!x_dev_list.devices && !x_dev_list.count)
     64     x_dev_list.devices = XListInputDevices(display, &x_dev_list.count);
     65   return x_dev_list;
     66 }
     67 
     68 const XIDeviceList& DeviceListCacheX::GetXI2DeviceList(Display* display) {
     69   XIDeviceList& xi_dev_list = xi_dev_list_map_[display];
     70   if (!xi_dev_list.devices && !xi_dev_list.count) {
     71     xi_dev_list.devices = XIQueryDevice(display, XIAllDevices,
     72                                        &xi_dev_list.count);
     73   }
     74   return xi_dev_list;
     75 }
     76 
     77 }  // namespace ui
     78 
     79