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| 1 // Copyright (c) 2011 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 VIEWS_TOUCHUI_TOUCH_FACTORY_H_ | |
| 6 #define VIEWS_TOUCHUI_TOUCH_FACTORY_H_ | |
| 7 #pragma once | |
| 8 | |
| 9 #include <bitset> | |
| 10 #include <vector> | |
| 11 | |
| 12 #include "base/memory/singleton.h" | |
| 13 #include "base/timer.h" | |
| 14 #include "views/views_export.h" | |
| 15 | |
| 16 typedef unsigned long Cursor; | |
| 17 typedef unsigned long Window; | |
| 18 typedef struct _XDisplay Display; | |
| 19 typedef union _XEvent XEvent; | |
| 20 | |
| 21 namespace views { | |
| 22 | |
| 23 // Functions related to determining touch devices. | |
| 24 class VIEWS_EXPORT TouchFactory { | |
| 25 public: | |
| 26 // Define the touch params following the Multi-touch Protocol. | |
| 27 enum TouchParam { | |
| 28 TP_TOUCH_MAJOR = 0, // Length of the touch area. | |
| 29 TP_TOUCH_MINOR, // Width of the touch area. | |
| 30 TP_ORIENTATION, // Angle between the X-axis and the major axis of the | |
| 31 // touch area. | |
| 32 TP_PRESSURE, // Pressure of the touch contact. | |
| 33 | |
| 34 // NOTE: A touch event can have multiple touch points. So when we receive a | |
| 35 // touch event, we need to determine which point triggered the event. | |
| 36 // A touch point can have both a 'Slot ID' and a 'Tracking ID', and they can | |
| 37 // be (in fact, usually are) different. The 'Slot ID' ranges between 0 and | |
| 38 // (X - 1), where X is the maximum touch points supported by the device. The | |
| 39 // 'Tracking ID' can be any 16-bit value. With XInput 2.0, an XI_Motion | |
| 40 // event that comes from a currently-unused 'Slot ID' indicates the creation | |
| 41 // of a new touch point, and any event that comes with a 0 value for | |
| 42 // 'Tracking ID' marks the removal of a touch point. During the lifetime of | |
| 43 // a touchpoint, we use the 'Slot ID' as its identifier. The XI_ButtonPress | |
| 44 // and XI_ButtonRelease events are ignored. | |
| 45 TP_SLOT_ID, // ID of the finger that triggered a touch event | |
| 46 // (useful when tracking multiple simultaneous | |
| 47 // touches) | |
| 48 TP_TRACKING_ID, // ID of the touch point. | |
| 49 | |
| 50 TP_LAST_ENTRY | |
| 51 }; | |
| 52 | |
| 53 // Returns the TouchFactory singleton. | |
| 54 static TouchFactory* GetInstance(); | |
| 55 | |
| 56 // Updates the list of devices. | |
| 57 void UpdateDeviceList(Display* display); | |
| 58 | |
| 59 // Checks whether an XI2 event should be processed or not (i.e. if the event | |
| 60 // originated from a device we are interested in). | |
| 61 bool ShouldProcessXI2Event(XEvent* xevent); | |
| 62 | |
| 63 // Setup an X Window for XInput2 events. | |
| 64 void SetupXI2ForXWindow(::Window xid); | |
| 65 | |
| 66 // Keeps a list of touch devices so that it is possible to determine if a | |
| 67 // pointer event is a touch-event or a mouse-event. The list is reset each | |
| 68 // time this is called. | |
| 69 void SetTouchDeviceList(const std::vector<unsigned int>& devices); | |
| 70 | |
| 71 // Is the device a touch-device? | |
| 72 bool IsTouchDevice(unsigned int deviceid) const; | |
| 73 | |
| 74 // Is the slot ID currently used? | |
| 75 bool IsSlotUsed(int slot) const; | |
| 76 | |
| 77 // Marks a slot as being used/unused. | |
| 78 void SetSlotUsed(int slot, bool used); | |
| 79 | |
| 80 // Grabs the touch devices for the specified window on the specified display. | |
| 81 // Returns if grab was successful for all touch devices. | |
| 82 bool GrabTouchDevices(Display* display, ::Window window); | |
| 83 | |
| 84 // Ungrabs the touch devices. Returns if ungrab was successful for all touch | |
| 85 // devices. | |
| 86 bool UngrabTouchDevices(Display* display); | |
| 87 | |
| 88 // Updates the root window to show (or hide) the cursor. Also indicate whether | |
| 89 // the timer should be started to automatically hide the cursor after a | |
| 90 // certain duration of inactivity (i.e. it is ignored if |show| is false). | |
| 91 void SetCursorVisible(bool show, bool start_timer); | |
| 92 | |
| 93 // Whether the cursor is currently visible or not. | |
| 94 bool is_cursor_visible() const { | |
| 95 return is_cursor_visible_; | |
| 96 } | |
| 97 | |
| 98 // Extract the TouchParam from the XEvent. Return true and the value is set | |
| 99 // if the TouchParam is found, false and value unchanged if the TouchParam | |
| 100 // is not found. | |
| 101 bool ExtractTouchParam(const XEvent& xev, TouchParam tp, float* value); | |
| 102 | |
| 103 // Normalize the TouchParam with value on deviceid to fall into [0, 1]. | |
| 104 // *value = (*value - min_value_of_tp) / (max_value_of_tp - min_value_of_tp) | |
| 105 // Returns true and sets the normalized value in|value| if normalization is | |
| 106 // successful. Returns false and |value| is unchanged otherwise. | |
| 107 bool NormalizeTouchParam(unsigned int deviceid, TouchParam tp, float* value); | |
| 108 | |
| 109 // Extract the range of the TouchParam. Return true if the range is available | |
| 110 // and written into min & max, false if the range is not available. | |
| 111 bool GetTouchParamRange(unsigned int deviceid, | |
| 112 TouchParam tp, | |
| 113 float* min, | |
| 114 float* max); | |
| 115 | |
| 116 void set_keep_mouse_cursor(bool keep) { keep_mouse_cursor_ = keep; } | |
| 117 bool keep_mouse_cursor() const { return keep_mouse_cursor_; } | |
| 118 | |
| 119 private: | |
| 120 TouchFactory(); | |
| 121 | |
| 122 ~TouchFactory(); | |
| 123 | |
| 124 void HideCursorForInactivity() { | |
| 125 SetCursorVisible(false, false); | |
| 126 } | |
| 127 | |
| 128 // Setup the internal bookkeeping of the touch params valuator information for | |
| 129 // touch devices | |
| 130 void SetupValuator(); | |
| 131 | |
| 132 // Requirement for Signleton | |
| 133 friend struct DefaultSingletonTraits<TouchFactory>; | |
| 134 | |
| 135 // The default cursor is hidden after startup, and when the mouse pointer is | |
| 136 // idle for a while. Once there is some event from a mouse device, the cursor | |
| 137 // is immediately displayed. | |
| 138 bool is_cursor_visible_; | |
| 139 | |
| 140 // Whether to turn off automatic hiding of mouse cursor. This is useful for | |
| 141 // debugging touch build on the desktop. | |
| 142 bool keep_mouse_cursor_; | |
| 143 | |
| 144 // The cursor is hidden if it is idle for a certain amount time. This timer | |
| 145 // is used to keep track of the idleness. | |
| 146 base::OneShotTimer<TouchFactory> cursor_timer_; | |
| 147 | |
| 148 // The default cursor. | |
| 149 Cursor arrow_cursor_; | |
| 150 | |
| 151 // The invisible cursor. | |
| 152 Cursor invisible_cursor_; | |
| 153 | |
| 154 // NOTE: To keep track of touch devices, we currently maintain a lookup table | |
| 155 // to quickly decide if a device is a touch device or not. We also maintain a | |
| 156 // list of the touch devices. Ideally, there will be only one touch device, | |
| 157 // and instead of having the lookup table and the list, there will be a single | |
| 158 // identifier for the touch device. This can be completed after enough testing | |
| 159 // on real touch devices. | |
| 160 | |
| 161 static const int kMaxDeviceNum = 128; | |
| 162 | |
| 163 // A quick lookup table for determining if events from the pointer device | |
| 164 // should be processed. | |
| 165 std::bitset<kMaxDeviceNum> pointer_device_lookup_; | |
| 166 | |
| 167 // A quick lookup table for determining if a device is a touch device. | |
| 168 std::bitset<kMaxDeviceNum> touch_device_lookup_; | |
| 169 | |
| 170 // The list of touch devices. | |
| 171 std::vector<int> touch_device_list_; | |
| 172 | |
| 173 // Index table to find the valuator for the TouchParam on the specific device | |
| 174 // by valuator_lookup_[device_id][touch_params]. Use 2-D array to get fast | |
| 175 // index at the expense of space. If the kMaxDeviceNum grows larger that the | |
| 176 // space waste becomes a concern, the 2D lookup table can be replaced by a | |
| 177 // hash map. | |
| 178 signed char valuator_lookup_[kMaxDeviceNum][TP_LAST_ENTRY]; | |
| 179 | |
| 180 // Index table to find the min & max value of the TouchParam on a specific | |
| 181 // device. | |
| 182 int touch_param_min_[kMaxDeviceNum][TP_LAST_ENTRY]; | |
| 183 int touch_param_max_[kMaxDeviceNum][TP_LAST_ENTRY]; | |
| 184 | |
| 185 // Maximum simultaneous touch points. | |
| 186 static const int kMaxTouchPoints = 32; | |
| 187 | |
| 188 // A lookup table for slots in use for a touch event. | |
| 189 std::bitset<kMaxTouchPoints> slots_used_; | |
| 190 | |
| 191 DISALLOW_COPY_AND_ASSIGN(TouchFactory); | |
| 192 }; | |
| 193 | |
| 194 } // namespace views | |
| 195 | |
| 196 #endif // VIEWS_TOUCHUI_TOUCH_FACTORY_H_ | |
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Chromium Code Reviews
Issue 7942004:
Consolidate/cleanup event cracking code; single out GdkEvents. (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/src