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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 #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 
     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 EVENTS_BASE_EXPORT DeviceListCacheX {
     40  public:
     41   static DeviceListCacheX* GetInstance();
     42 
     43   void UpdateDeviceList(Display* display);
     44 
     45   // Returns the list of devices associated with |display|. Uses the old X11
     46   // protocol to get the list of the devices.
     47   const XDeviceList& GetXDeviceList(Display* display);
     48 
     49   // Returns the list of devices associated with |display|. Uses the newer
     50   // XINPUT2 protocol to get the list of devices. Before making this call, make
     51   // sure that XInput2 support is available (e.g. by calling
     52   // IsXInput2Available()).
     53   const XIDeviceList& GetXI2DeviceList(Display* display);
     54 
     55  private:
     56   friend struct DefaultSingletonTraits<DeviceListCacheX>;
     57 
     58   DeviceListCacheX();
     59   ~DeviceListCacheX();
     60 
     61   std::map<Display*, XDeviceList> x_dev_list_map_;
     62   std::map<Display*, XIDeviceList> xi_dev_list_map_;
     63 
     64   DISALLOW_COPY_AND_ASSIGN(DeviceListCacheX);
     65 };
     66 
     67 }  // namespace ui
     68 
     69 #endif  // UI_EVENTS_X_DEVICE_LIST_CACHE_X_H_
     70 
     71