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.
5 #ifndef UI_EVENTS_X_TOUCH_FACTORY_X11_H_
6 #define UI_EVENTS_X_TOUCH_FACTORY_X11_H_
12 #include "base/timer/timer.h"
13 #include "ui/events/events_export.h"
14 #include "ui/gfx/sequential_id_generator.h"
16 template <typename T> struct DefaultSingletonTraits;
18 typedef unsigned long Cursor;
19 typedef unsigned long Window;
20 typedef struct _XDisplay Display;
21 typedef union _XEvent XEvent;
25 // Functions related to determining touch devices.
26 class EVENTS_EXPORT TouchFactory {
32 // Returns the TouchFactory singleton.
33 static TouchFactory* GetInstance();
35 // Sets the touch devices from the command line.
36 static void SetTouchDeviceListFromCommandLine();
38 // Updates the list of devices.
39 void UpdateDeviceList(Display* display);
41 // Checks whether an XI2 event should be processed or not (i.e. if the event
42 // originated from a device we are interested in).
43 bool ShouldProcessXI2Event(XEvent* xevent);
45 // Setup an X Window for XInput2 events.
46 void SetupXI2ForXWindow(::Window xid);
48 // Keeps a list of touch devices so that it is possible to determine if a
49 // pointer event is a touch-event or a mouse-event. The list is reset each
50 // time this is called.
51 void SetTouchDeviceList(const std::vector<unsigned int>& devices);
53 // Is the device a touch-device?
54 bool IsTouchDevice(unsigned int deviceid) const;
56 // Is the device a real multi-touch-device? (see doc. for |touch_device_list_|
57 // below for more explanation.)
58 bool IsMultiTouchDevice(unsigned int deviceid) const;
60 #if defined(USE_XI2_MT)
61 // Tries to find an existing slot ID mapping to tracking ID. Returns true
62 // if the slot is found and it is saved in |slot|, false if no such slot
64 bool QuerySlotForTrackingID(uint32 tracking_id, int* slot);
66 // Tries to find an existing slot ID mapping to tracking ID. If there
67 // isn't one already, allocates a new slot ID and sets up the mapping.
68 int GetSlotForTrackingID(uint32 tracking_id);
70 // Releases the slot ID mapping to tracking ID.
71 void ReleaseSlotForTrackingID(uint32 tracking_id);
74 // Is the slot ID currently used?
75 bool IsSlotUsed(int slot) const;
77 // Marks a slot as being used/unused.
78 void SetSlotUsed(int slot, bool used);
80 // Whether any touch device is currently present and enabled.
81 bool IsTouchDevicePresent();
83 // Sets up the device id in the list |devices| as multi-touch capable
84 // devices and enables touch events processing. This function is only
85 // for test purpose, and it does not query from X server.
86 void SetTouchDeviceForTest(const std::vector<unsigned int>& devices);
89 // Requirement for Singleton
90 friend struct DefaultSingletonTraits<TouchFactory>;
92 // NOTE: To keep track of touch devices, we currently maintain a lookup table
93 // to quickly decide if a device is a touch device or not. We also maintain a
94 // list of the touch devices. Ideally, there will be only one touch device,
95 // and instead of having the lookup table and the list, there will be a single
96 // identifier for the touch device. This can be completed after enough testing
97 // on real touch devices.
99 static const int kMaxDeviceNum = 128;
101 // A quick lookup table for determining if events from the pointer device
102 // should be processed.
103 std::bitset<kMaxDeviceNum> pointer_device_lookup_;
105 // A quick lookup table for determining if a device is a touch device.
106 std::bitset<kMaxDeviceNum> touch_device_lookup_;
108 // Indicates whether a touch device is currently available or not.
109 bool touch_device_available_;
111 // Indicates whether touch events are explicitly disabled.
112 bool touch_events_disabled_;
114 // The list of touch devices. For testing/debugging purposes, a single-pointer
115 // device (mouse or touch screen without sufficient X/driver support for MT)
116 // can sometimes be treated as a touch device. The key in the map represents
117 // the device id, and the value represents if the device is multi-touch
119 std::map<int, bool> touch_device_list_;
121 // Maximum simultaneous touch points.
122 static const int kMaxTouchPoints = 32;
124 #if defined(USE_XI2_MT)
125 SequentialIDGenerator id_generator_;
128 // A lookup table for slots in use for a touch event.
129 std::bitset<kMaxTouchPoints> slots_used_;
131 DISALLOW_COPY_AND_ASSIGN(TouchFactory);
136 #endif // UI_EVENTS_X_TOUCH_FACTORY_X11_H_