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https://github.com/NickHu/sway
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104 lines
2.8 KiB
C
104 lines
2.8 KiB
C
#ifndef _SWAY_GESTURE_H
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#define _SWAY_GESTURE_H
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#include <stdbool.h>
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#include <stdint.h>
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/**
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* A gesture type used in binding.
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*/
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enum gesture_type {
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GESTURE_TYPE_NONE = 0,
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GESTURE_TYPE_HOLD,
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GESTURE_TYPE_PINCH,
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GESTURE_TYPE_SWIPE,
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};
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// Turns single type enum value to constant string representation.
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const char *gesture_type_string(enum gesture_type direction);
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// Value to use to accept any finger count
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extern const uint8_t GESTURE_FINGERS_ANY;
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/**
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* A gesture direction used in binding.
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*/
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enum gesture_direction {
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GESTURE_DIRECTION_NONE = 0,
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// Directions based on delta x and y
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GESTURE_DIRECTION_UP = 1 << 0,
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GESTURE_DIRECTION_DOWN = 1 << 1,
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GESTURE_DIRECTION_LEFT = 1 << 2,
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GESTURE_DIRECTION_RIGHT = 1 << 3,
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// Directions based on scale
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GESTURE_DIRECTION_INWARD = 1 << 4,
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GESTURE_DIRECTION_OUTWARD = 1 << 5,
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// Directions based on rotation
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GESTURE_DIRECTION_CLOCKWISE = 1 << 6,
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GESTURE_DIRECTION_COUNTERCLOCKWISE = 1 << 7,
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};
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// Turns single direction enum value to constant string representation.
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const char *gesture_direction_string(enum gesture_direction direction);
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/**
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* Struct representing a pointer gesture
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*/
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struct gesture {
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enum gesture_type type;
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uint8_t fingers;
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uint32_t directions;
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};
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/**
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* Parses gesture from <gesture>[:<fingers>][:<directions>] string.
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*
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* Return NULL on success, otherwise error message string
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*/
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char *gesture_parse(const char *input, struct gesture *output);
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// Turns gesture into string representation
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char *gesture_to_string(struct gesture *gesture);
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// Check if gesture is of certain type and finger count.
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bool gesture_check(struct gesture *target,
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enum gesture_type type, uint8_t fingers);
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// Check if a gesture target/binding is match by other gesture/input
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bool gesture_match(struct gesture *target,
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struct gesture *to_match, bool exact);
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// Returns true if gesture are exactly the same
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bool gesture_equal(struct gesture *a, struct gesture *b);
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// Compare distance between two matched target gestures.
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int8_t gesture_compare(struct gesture *a, struct gesture *b);
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// Small helper struct to track gestures over time
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struct gesture_tracker {
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enum gesture_type type;
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uint8_t fingers;
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double dx, dy;
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double scale;
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double rotation;
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};
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// Begin gesture tracking
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void gesture_tracker_begin(struct gesture_tracker *tracker,
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enum gesture_type type, uint8_t fingers);
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// Check if the provides type is currently being tracked
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bool gesture_tracker_check(struct gesture_tracker *tracker,
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enum gesture_type type);
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// Update gesture track with new data point
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void gesture_tracker_update(struct gesture_tracker *tracker, double dx,
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double dy, double scale, double rotation);
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// Reset tracker
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void gesture_tracker_cancel(struct gesture_tracker *tracker);
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// Reset tracker and return gesture tracked
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struct gesture *gesture_tracker_end(struct gesture_tracker *tracker);
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#endif
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