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 #ifndef UI_BASE_X_DEVICE_LIST_CACHE_X_H_ 6 #define UI_BASE_X_DEVICE_LIST_CACHE_X_H_ 7 8 #include <X11/extensions/XInput.h> 9 #include <X11/extensions/XInput2.h> 10 11 #include <map> 12 13 #include "base/basictypes.h" 14 #include "ui/base/ui_export.h" 15 16 template <typename T> struct DefaultSingletonTraits; 17 18 typedef struct _XDisplay Display; 19 20 template <typename T> 21 struct DeviceList { 22 DeviceList() : devices(NULL), count(0) { 23 } 24 T& operator[] (int x) { 25 return devices[x]; 26 } 27 T* devices; 28 int count; 29 }; 30 31 typedef struct DeviceList<XDeviceInfo> XDeviceList; 32 typedef struct DeviceList<XIDeviceInfo> XIDeviceList; 33 34 namespace ui { 35 36 // A class to cache the current XInput device list. This minimized the 37 // round-trip time to the X server whenever such a device list is needed. The 38 // update function will be called on each incoming XI_HierarchyChanged event. 39 class UI_EXPORT DeviceListCacheX { 40 public: 41 static DeviceListCacheX* GetInstance(); 42 43 void UpdateDeviceList(Display* display); 44 45 const XDeviceList& GetXDeviceList(Display* display); 46 const XIDeviceList& GetXI2DeviceList(Display* display); 47 48 private: 49 friend struct DefaultSingletonTraits<DeviceListCacheX>; 50 51 DeviceListCacheX(); 52 ~DeviceListCacheX(); 53 54 std::map<Display*, XDeviceList> x_dev_list_map_; 55 std::map<Display*, XIDeviceList> xi_dev_list_map_; 56 57 DISALLOW_COPY_AND_ASSIGN(DeviceListCacheX); 58 }; 59 60 } // namespace ui 61 62 #endif // UI_BASE_X_DEVICE_LIST_CACHE_X_H_ 63 64
