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_EVENTS_X_DEVICE_LIST_CACHE_X_H_ 6#define UI_EVENTS_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/events/events_base_export.h" 15 16template <typename T> struct DefaultSingletonTraits; 17 18typedef struct _XDisplay Display; 19 20template <typename T> 21struct DeviceList { 22 DeviceList() : devices(NULL), count(0) { 23 } 24 T& operator[] (int x) { 25 return devices[x]; 26 } 27 const T& operator[](int x) const { return devices[x]; } 28 T* devices; 29 int count; 30}; 31 32typedef struct DeviceList<XDeviceInfo> XDeviceList; 33typedef struct DeviceList<XIDeviceInfo> XIDeviceList; 34 35namespace ui { 36 37// A class to cache the current XInput device list. This minimized the 38// round-trip time to the X server whenever such a device list is needed. The 39// update function will be called on each incoming XI_HierarchyChanged event. 40class EVENTS_BASE_EXPORT DeviceListCacheX { 41 public: 42 static DeviceListCacheX* GetInstance(); 43 44 void UpdateDeviceList(Display* display); 45 46 // Returns the list of devices associated with |display|. Uses the old X11 47 // protocol to get the list of the devices. 48 const XDeviceList& GetXDeviceList(Display* display); 49 50 // Returns the list of devices associated with |display|. Uses the newer 51 // XINPUT2 protocol to get the list of devices. Before making this call, make 52 // sure that XInput2 support is available (e.g. by calling 53 // IsXInput2Available()). 54 const XIDeviceList& GetXI2DeviceList(Display* display); 55 56 private: 57 friend struct DefaultSingletonTraits<DeviceListCacheX>; 58 59 DeviceListCacheX(); 60 ~DeviceListCacheX(); 61 62 std::map<Display*, XDeviceList> x_dev_list_map_; 63 std::map<Display*, XIDeviceList> xi_dev_list_map_; 64 65 DISALLOW_COPY_AND_ASSIGN(DeviceListCacheX); 66}; 67 68} // namespace ui 69 70#endif // UI_EVENTS_X_DEVICE_LIST_CACHE_X_H_ 71 72