ui/events/devices/x11/touch_factory_x11.h

   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_DEVICES_X11_TOUCH_FACTORY_X11_H_
   6 #define UI_EVENTS_DEVICES_X11_TOUCH_FACTORY_X11_H_
   7
   8 #include <bitset>
   9 #include <map>
  10 #include <set>
  11 #include <utility>
  12 #include <vector>
  13
  14 #include "ui/events/devices/events_devices_export.h"
  15 #include "ui/gfx/sequential_id_generator.h"
  16
  17 namespace base {
  18
  19 template <typename T> struct DefaultSingletonTraits;
  20 }
  21
  22 typedef unsigned long Cursor;
  23 typedef unsigned long Window;
  24 typedef struct _XDisplay Display;
  25 typedef union _XEvent XEvent;
  26
  27 namespace ui {
  28
  29 // Functions related to determining touch devices.
  30 class EVENTS_DEVICES_EXPORT TouchFactory {
  31  private:
  32   TouchFactory();
  33   ~TouchFactory();
  34
  35  public:
  36   // Returns the TouchFactory singleton.
  37   static TouchFactory* GetInstance();
  38
  39   // Sets the touch devices from the command line.
  40   static void SetTouchDeviceListFromCommandLine();
  41
  42   // Updates the list of devices.
  43   void UpdateDeviceList(Display* display);
  44
  45   // Checks whether an XI2 event should be processed or not (i.e. if the event
  46   // originated from a device we are interested in).
  47   bool ShouldProcessXI2Event(XEvent* xevent);
  48
  49   // Setup an X Window for XInput2 events.
  50   void SetupXI2ForXWindow(::Window xid);
  51
  52   // Keeps a list of touch devices so that it is possible to determine if a
  53   // pointer event is a touch-event or a mouse-event. The list is reset each
  54   // time this is called.
  55   void SetTouchDeviceList(const std::vector<int>& devices);
  56
  57   // Is the device ID valid?
  58   bool IsValidDevice(int deviceid) const;
  59
  60   // Is the device a touch-device?
  61   bool IsTouchDevice(int deviceid) const;
  62
  63   // Is the device a real multi-touch-device? (see doc. for |touch_device_list_|
  64   // below for more explanation.)
  65   bool IsMultiTouchDevice(int deviceid) const;
  66
  67   // Tries to find an existing slot ID mapping to tracking ID. Returns true
  68   // if the slot is found and it is saved in |slot|, false if no such slot
  69   // can be found.
  70   bool QuerySlotForTrackingID(uint32 tracking_id, int* slot);
  71
  72   // Tries to find an existing slot ID mapping to tracking ID. If there
  73   // isn't one already, allocates a new slot ID and sets up the mapping.
  74   int GetSlotForTrackingID(uint32 tracking_id);
  75
  76   // Releases the slot ID mapping to tracking ID.
  77   void ReleaseSlotForTrackingID(uint32 tracking_id);
  78
  79   // Whether any touch device is currently present and enabled.
  80   bool IsTouchDevicePresent();
  81
  82   // Pairs of <vendor id, product id> of external touch screens.
  83   const std::set<std::pair<int, int> >& GetTouchscreenIds() const {
  84     return touchscreen_ids_;
  85   }
  86
  87   // Resets the TouchFactory singleton.
  88   void ResetForTest();
  89
  90   // Sets up the device id in the list |devices| as multi-touch capable
  91   // devices and enables touch events processing. This function is only
  92   // for test purpose, and it does not query from X server.
  93   void SetTouchDeviceForTest(const std::vector<int>& devices);
  94
  95   // Sets up the device id in the list |devices| as pointer devices.
  96   // This function is only for test purpose, and it does not query from
  97   // X server.
  98   void SetPointerDeviceForTest(const std::vector<int>& devices);
  99
 100  private:
 101   // Requirement for Singleton
 102   friend struct base::DefaultSingletonTraits<TouchFactory>;
 103
 104   void CacheTouchscreenIds(int id);
 105
 106   // NOTE: To keep track of touch devices, we currently maintain a lookup table
 107   // to quickly decide if a device is a touch device or not. We also maintain a
 108   // list of the touch devices. Ideally, there will be only one touch device,
 109   // and instead of having the lookup table and the list, there will be a single
 110   // identifier for the touch device. This can be completed after enough testing
 111   // on real touch devices.
 112
 113   static const int kMaxDeviceNum = 128;
 114
 115   // A quick lookup table for determining if events from the pointer device
 116   // should be processed.
 117   std::bitset<kMaxDeviceNum> pointer_device_lookup_;
 118
 119   // A quick lookup table for determining if a device is a touch device.
 120   std::bitset<kMaxDeviceNum> touch_device_lookup_;
 121
 122   // Indicates whether touch events are explicitly disabled.
 123   bool touch_events_disabled_;
 124
 125   // The list of touch devices. For testing/debugging purposes, a single-pointer
 126   // device (mouse or touch screen without sufficient X/driver support for MT)
 127   // can sometimes be treated as a touch device. The key in the map represents
 128   // the device id, and the value represents if the device is multi-touch
 129   // capable.
 130   std::map<int, bool> touch_device_list_;
 131
 132   // Touch screen <vid, pid>s.
 133   std::set<std::pair<int, int> > touchscreen_ids_;
 134
 135   // Device ID of the virtual core keyboard.
 136   int virtual_core_keyboard_device_;
 137
 138   SequentialIDGenerator id_generator_;
 139
 140   // Associate each device ID with its master device ID.
 141   std::map<int, int> device_master_id_list_;
 142
 143   DISALLOW_COPY_AND_ASSIGN(TouchFactory);
 144 };
 145
 146 }  // namespace ui
 147
 148 #endif  // UI_EVENTS_DEVICES_X11_TOUCH_FACTORY_X11_H_