1 // Copyright 2013 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_OZONE_EVDEV_TOUCH_EVENT_CONVERTER_EVDEV_H_ 6 #define UI_EVENTS_OZONE_EVDEV_TOUCH_EVENT_CONVERTER_EVDEV_H_ 7 8 #include <bitset> 9 10 #include "base/compiler_specific.h" 11 #include "ui/events/event_constants.h" 12 #include "ui/events/events_export.h" 13 #include "ui/events/ozone/event_converter_ozone.h" 14 15 namespace ui { 16 17 class TouchEvent; 18 19 class EVENTS_EXPORT TouchEventConverterEvdev : public EventConverterOzone { 20 public: 21 enum { 22 MAX_FINGERS = 11 23 }; 24 TouchEventConverterEvdev(int fd, int id); 25 virtual ~TouchEventConverterEvdev(); 26 27 private: 28 friend class MockTouchEventConverterEvdev; 29 30 // Unsafe part of initialization. 31 void Init(); 32 33 // Overidden from base::MessagePumpLibevent::Watcher. 34 virtual void OnFileCanReadWithoutBlocking(int fd) OVERRIDE; 35 virtual void OnFileCanWriteWithoutBlocking(int fd) OVERRIDE; 36 37 // Pressure values. 38 int pressure_min_; 39 int pressure_max_; // Used to normalize pressure values. 40 41 // Touch scaling. 42 float x_scale_; 43 float y_scale_; 44 45 // Maximum coordinate-values allowed for the events. 46 int x_max_; 47 int y_max_; 48 49 // Touch point currently being updated from the /dev/input/event* stream. 50 int current_slot_; 51 52 // File descriptor for the /dev/input/event* instance. 53 int fd_; 54 55 // Number corresponding to * in the source evdev device: /dev/input/event* 56 int id_; 57 58 // Bit field tracking which in-progress touch points have been modified 59 // without a syn event. 60 std::bitset<MAX_FINGERS> altered_slots_; 61 62 struct InProgressEvents { 63 int x_; 64 int y_; 65 int id_; // Device reported "unique" touch point id; -1 means not active 66 int finger_; // "Finger" id starting from 0; -1 means not active 67 68 EventType type_; 69 int major_; 70 float pressure_; 71 }; 72 73 // In-progress touch points. 74 InProgressEvents events_[MAX_FINGERS]; 75 76 DISALLOW_COPY_AND_ASSIGN(TouchEventConverterEvdev); 77 }; 78 79 } // namespace ui 80 81 #endif // UI_EVENTS_OZONE_EVDEV_TOUCH_EVENT_CONVERTER_EVDEV_H_ 82 83
