1+ #ifndef USER_INPUT_H_
2+ #define USER_INPUT_H_
3+
4+ #include <xkbcommon/xkbcommon.h>
5+ #include <flutter_embedder.h>
6+
7+ #define LOG_USER_INPUT_ERROR (...) fprintf(stderr, "[user input] " __VA_ARGS__)
8+ #define MAX_COLLECTED_FLUTTER_POINTER_EVENTS 64
9+
10+ #define FLUTTER_POINTER_EVENT (_phase , _timestamp , _x , _y , _device , _signal_kind , _scroll_delta_x , _scroll_delta_y , _device_kind , _buttons ) \
11+ (FlutterPointerEvent) { \
12+ .struct_size = sizeof(FlutterPointerEvent), \
13+ .phase = (_phase), \
14+ .timestamp = (_timestamp), \
15+ .x = (_x), .y = (_y), \
16+ .device = (_device), \
17+ .signal_kind = (_signal_kind), \
18+ .scroll_delta_x = (_scroll_delta_x), \
19+ .scroll_delta_y = (_scroll_delta_y), \
20+ .device_kind = (_device_kind), \
21+ .buttons = (_buttons) \
22+ }
23+
24+ #define FLUTTER_POINTER_TOUCH_ADD_EVENT (_timestamp , _x , _y , _device_id ) \
25+ FLUTTER_POINTER_EVENT(kAdd, _timestamp, _x, _y, _device_id, kFlutterPointerSignalKindNone, 0.0, 0.0, kFlutterPointerDeviceKindTouch, 0)
26+
27+ #define FLUTTER_POINTER_TOUCH_REMOVE_EVENT (_timestamp , _x , _y , _device_id ) \
28+ FLUTTER_POINTER_EVENT(kRemove, _timestamp, _x, _y, _device_id, kFlutterPointerSignalKindNone, 0.0, 0.0, kFlutterPointerDeviceKindTouch, 0)
29+
30+ #define FLUTTER_POINTER_TOUCH_MOVE_EVENT (_timestamp , _x , _y , _device_id ) \
31+ FLUTTER_POINTER_EVENT(kMove, _timestamp, _x, _y, _device_id, kFlutterPointerSignalKindNone, 0.0, 0.0, kFlutterPointerDeviceKindTouch, 0)
32+
33+ #define FLUTTER_POINTER_TOUCH_DOWN_EVENT (_timestamp , _x , _y , _device_id ) \
34+ FLUTTER_POINTER_EVENT(kDown, _timestamp, _x, _y, _device_id, kFlutterPointerSignalKindNone, 0.0, 0.0, kFlutterPointerDeviceKindTouch, 0)
35+
36+ #define FLUTTER_POINTER_TOUCH_UP_EVENT (_timestamp , _x , _y , _device_id ) \
37+ FLUTTER_POINTER_EVENT(kUp, _timestamp, _x, _y, _device_id, kFlutterPointerSignalKindNone, 0.0, 0.0, kFlutterPointerDeviceKindTouch, 0)
38+
39+ #define FLUTTER_POINTER_MOUSE_BUTTON_EVENT (_phase , _timestamp , _x , _y , _device_id , _buttons ) \
40+ FLUTTER_POINTER_EVENT(_phase, _timestamp, _x, _y, _device_id, kFlutterPointerSignalKindNone, 0.0, 0.0, kFlutterPointerDeviceKindMouse, _buttons)
41+
42+ #define FLUTTER_POINTER_MOUSE_ADD_EVENT (_timestamp , _x , _y , _device_id , _buttons ) \
43+ FLUTTER_POINTER_EVENT(kAdd, _timestamp, _x, _y, _device_id, kFlutterPointerSignalKindNone, 0.0, 0.0, kFlutterPointerDeviceKindMouse, _buttons)
44+
45+ #define FLUTTER_POINTER_MOUSE_REMOVE_EVENT (_timestamp , _x , _y , _device_id , _buttons ) \
46+ FLUTTER_POINTER_EVENT(kRemove, _timestamp, _x, _y, _device_id, kFlutterPointerSignalKindNone, 0.0, 0.0, kFlutterPointerDeviceKindMouse, _buttons)
47+
48+ #define FLUTTER_POINTER_REMOVE_EVENT (_timestamp , _x , _y , _device , _buttons ) \
49+ FLUTTER_POINTER_EVENT(kRemove, _timestamp, _x, _y, _device_id, kFlutterPointerSignalKindNone, 0.0, 0.0, kFlutterPointerDeviceKindMouse, _buttons)
50+
51+ #define FLUTTER_POINTER_MOUSE_MOVE_EVENT (_timestamp , _x , _y , _device_id , _buttons ) \
52+ FLUTTER_POINTER_EVENT( \
53+ (_buttons) & kFlutterPointerButtonMousePrimary ? kMove : kHover, \
54+ _timestamp, \
55+ _x, _y, \
56+ _device_id, \
57+ kFlutterPointerSignalKindNone, \
58+ 0.0, 0.0, \
59+ kFlutterPointerDeviceKindMouse, \
60+ _buttons\
61+ )
62+
63+ typedef void (* flutter_pointer_event_callback_t )(void * userdata , const FlutterPointerEvent * events , size_t n_events );
64+
65+ typedef void (* utf8_character_callback_t )(void * userdata , uint8_t * character );
66+
67+ typedef void (* xkb_keysym_callback_t )(void * userdata , xkb_keysym_t keysym );
68+
69+ typedef void (* gtk_keyevent_callback_t )(
70+ void * userdata ,
71+ uint32_t unicode_scalar_values ,
72+ uint32_t key_code ,
73+ uint32_t scan_code ,
74+ uint32_t modifiers ,
75+ bool is_down
76+ );
77+
78+ typedef void (* set_cursor_enabled_callback_t )(void * userdata , bool enabled );
79+
80+ typedef void (* move_cursor_callback_t )(void * userdata , unsigned int x , unsigned int y );
81+
82+ struct user_input_interface {
83+ flutter_pointer_event_callback_t on_flutter_pointer_event ;
84+ utf8_character_callback_t on_utf8_character ;
85+ xkb_keysym_callback_t on_xkb_keysym ;
86+ gtk_keyevent_callback_t on_gtk_keyevent ;
87+ set_cursor_enabled_callback_t on_set_cursor_enabled ;
88+ move_cursor_callback_t on_move_cursor ;
89+ };
90+
91+ struct user_input ;
92+
93+ /**
94+ * @brief Create a new user input instance. Will try to load the default keyboard config from /etc/default/keyboard
95+ * and create a udev-backed libinput instance.
96+ */
97+ struct user_input * user_input_new (
98+ const struct user_input_interface * interface ,
99+ void * userdata ,
100+ const FlutterTransformation * display_to_view_transform ,
101+ const FlutterTransformation * view_to_display_transform ,
102+ unsigned int display_width ,
103+ unsigned int display_height
104+ );
105+
106+ /**
107+ * @brief Destroy this user input instance and free all allocated memory. This will not remove any input devices
108+ * added to flutter and won't invoke any callbacks in the user input interface at all.
109+ */
110+ void user_input_destroy (struct user_input * input );
111+
112+ /**
113+ * @brief Set a 3x3 matrix and display width / height so user_input can transform any device coordinates into
114+ * proper flutter view coordinates. (For example to account for a rotated display)
115+ * Will also transform absolute & relative mouse movements.
116+ *
117+ * @param display_to_view_transform will be copied internally.
118+ */
119+ void user_input_set_transform (
120+ struct user_input * input ,
121+ const FlutterTransformation * display_to_view_transform ,
122+ const FlutterTransformation * view_to_display_transform ,
123+ unsigned int display_width ,
124+ unsigned int display_height
125+ );
126+
127+ /**
128+ * @brief Returns a filedescriptor used for input event notification. The returned
129+ * filedescriptor should be listened to with EPOLLIN | EPOLLRDHUP | EPOLLPRI or equivalent.
130+ * When the fd becomes ready, @ref user_input_on_fd_ready should be called not long after it
131+ * became ready. (libinput somehow relies on that)
132+ */
133+ int user_input_get_fd (struct user_input * input );
134+
135+ /**
136+ * @brief Should be called when the fd returned by @ref user_input_get_fd becomes ready.
137+ * The user_input_interface callbacks will be called inside this function.
138+ */
139+ int user_input_on_fd_ready (struct user_input * input );
140+
141+ #endif
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