sway/common/gesture.c

333 lines
8.8 KiB
C
Raw Permalink Normal View History

#include "gesture.h"
#include <math.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "list.h"
#include "log.h"
#include "stringop.h"
const uint8_t GESTURE_FINGERS_ANY = 0;
char *gesture_parse(const char *input, struct gesture *output) {
// Clear output in case of failure
output->type = GESTURE_TYPE_NONE;
output->fingers = GESTURE_FINGERS_ANY;
output->directions = GESTURE_DIRECTION_NONE;
// Split input type, fingers and directions
list_t *split = split_string(input, ":");
if (split->length < 1 || split->length > 3) {
return format_str(
"expected <gesture>[:<fingers>][:direction], got %s",
input);
}
// Parse gesture type
if (strcmp(split->items[0], "hold") == 0) {
output->type = GESTURE_TYPE_HOLD;
} else if (strcmp(split->items[0], "pinch") == 0) {
output->type = GESTURE_TYPE_PINCH;
} else if (strcmp(split->items[0], "swipe") == 0) {
output->type = GESTURE_TYPE_SWIPE;
} else {
return format_str("expected hold|pinch|swipe, got %s",
(const char *)split->items[0]);
}
// Parse optional arguments
if (split->length > 1) {
char *next = split->items[1];
// Try to parse as finger count (1-9)
if (strlen(next) == 1 && '1' <= next[0] && next[0] <= '9') {
output->fingers = atoi(next);
// Move to next if available
next = split->length == 3 ? split->items[2] : NULL;
} else if (split->length == 3) {
// Fail here if argument can only be finger count
return format_str("expected 1-9, got %s", next);
}
// If there is an argument left, try to parse as direction
if (next) {
list_t *directions = split_string(next, "+");
for (int i = 0; i < directions->length; ++i) {
const char *item = directions->items[i];
if (strcmp(item, "any") == 0) {
continue;
} else if (strcmp(item, "up") == 0) {
output->directions |= GESTURE_DIRECTION_UP;
} else if (strcmp(item, "down") == 0) {
output->directions |= GESTURE_DIRECTION_DOWN;
} else if (strcmp(item, "left") == 0) {
output->directions |= GESTURE_DIRECTION_LEFT;
} else if (strcmp(item, "right") == 0) {
output->directions |= GESTURE_DIRECTION_RIGHT;
} else if (strcmp(item, "inward") == 0) {
output->directions |= GESTURE_DIRECTION_INWARD;
} else if (strcmp(item, "outward") == 0) {
output->directions |= GESTURE_DIRECTION_OUTWARD;
} else if (strcmp(item, "clockwise") == 0) {
output->directions |= GESTURE_DIRECTION_CLOCKWISE;
} else if (strcmp(item, "counterclockwise") == 0) {
output->directions |= GESTURE_DIRECTION_COUNTERCLOCKWISE;
} else {
return format_str("expected direction, got %s", item);
}
}
list_free_items_and_destroy(directions);
}
} // if optional args
list_free_items_and_destroy(split);
return NULL;
}
const char *gesture_type_string(enum gesture_type type) {
switch (type) {
case GESTURE_TYPE_NONE:
return "none";
case GESTURE_TYPE_HOLD:
return "hold";
case GESTURE_TYPE_PINCH:
return "pinch";
case GESTURE_TYPE_SWIPE:
return "swipe";
}
return NULL;
}
const char *gesture_direction_string(enum gesture_direction direction) {
switch (direction) {
case GESTURE_DIRECTION_NONE:
return "none";
case GESTURE_DIRECTION_UP:
return "up";
case GESTURE_DIRECTION_DOWN:
return "down";
case GESTURE_DIRECTION_LEFT:
return "left";
case GESTURE_DIRECTION_RIGHT:
return "right";
case GESTURE_DIRECTION_INWARD:
return "inward";
case GESTURE_DIRECTION_OUTWARD:
return "outward";
case GESTURE_DIRECTION_CLOCKWISE:
return "clockwise";
case GESTURE_DIRECTION_COUNTERCLOCKWISE:
return "counterclockwise";
}
return NULL;
}
// Helper to turn combination of directions flags into string representation.
static char *gesture_directions_to_string(uint32_t directions) {
char *result = NULL;
for (uint8_t bit = 0; bit < 32; bit++) {
uint32_t masked = directions & (1 << bit);
if (masked) {
const char *name = gesture_direction_string(masked);
if (!name) {
name = "unknown";
}
if (!result) {
result = strdup(name);
} else {
char *new = format_str("%s+%s", result, name);
free(result);
result = new;
}
}
}
if(!result) {
return strdup("any");
}
return result;
}
char *gesture_to_string(struct gesture *gesture) {
char *directions = gesture_directions_to_string(gesture->directions);
char *result = format_str("%s:%u:%s",
gesture_type_string(gesture->type),
gesture->fingers, directions);
free(directions);
return result;
}
bool gesture_check(struct gesture *target, enum gesture_type type, uint8_t fingers) {
// Check that gesture type matches
if (target->type != type) {
return false;
}
// Check that finger count matches
if (target->fingers != GESTURE_FINGERS_ANY && target->fingers != fingers) {
return false;
}
return true;
}
bool gesture_match(struct gesture *target, struct gesture *to_match, bool exact) {
// Check type and fingers
if (!gesture_check(target, to_match->type, to_match->fingers)) {
return false;
}
// Enforce exact matches ...
if (exact && target->directions != to_match->directions) {
return false;
}
// ... or ensure all target directions are matched
return (target->directions & to_match->directions) == target->directions;
}
bool gesture_equal(struct gesture *a, struct gesture *b) {
return a->type == b->type
&& a->fingers == b->fingers
&& a->directions == b->directions;
}
// Return count of set bits in directions bit field.
static uint8_t gesture_directions_count(uint32_t directions) {
uint8_t count = 0;
for (; directions; directions >>= 1) {
count += directions & 1;
}
return count;
}
// Compare direction bit count of two direction.
static int8_t gesture_directions_compare(uint32_t a, uint32_t b) {
return gesture_directions_count(a) - gesture_directions_count(b);
}
// Compare two direction based on their direction bit count
int8_t gesture_compare(struct gesture *a, struct gesture *b) {
return gesture_directions_compare(a->directions, b->directions);
}
void gesture_tracker_begin(struct gesture_tracker *tracker,
enum gesture_type type, uint8_t fingers) {
tracker->type = type;
tracker->fingers = fingers;
tracker->dx = 0.0;
tracker->dy = 0.0;
tracker->scale = 1.0;
tracker->rotation = 0.0;
sway_log(SWAY_DEBUG, "begin tracking %s:%u:? gesture",
gesture_type_string(type), fingers);
}
bool gesture_tracker_check(struct gesture_tracker *tracker, enum gesture_type type) {
return tracker->type == type;
}
void gesture_tracker_update(struct gesture_tracker *tracker,
double dx, double dy, double scale, double rotation) {
if (tracker->type == GESTURE_TYPE_HOLD) {
sway_assert(false, "hold does not update.");
return;
}
tracker->dx += dx;
tracker->dy += dy;
if (tracker->type == GESTURE_TYPE_PINCH) {
tracker->scale = scale;
tracker->rotation += rotation;
}
sway_log(SWAY_DEBUG, "update tracking %s:%u:? gesture: %f %f %f %f",
gesture_type_string(tracker->type),
tracker->fingers,
tracker->dx, tracker->dy,
tracker->scale, tracker->rotation);
}
void gesture_tracker_cancel(struct gesture_tracker *tracker) {
sway_log(SWAY_DEBUG, "cancel tracking %s:%u:? gesture",
gesture_type_string(tracker->type), tracker->fingers);
tracker->type = GESTURE_TYPE_NONE;
}
struct gesture *gesture_tracker_end(struct gesture_tracker *tracker) {
struct gesture *result = calloc(1, sizeof(struct gesture));
// Ignore gesture under some threshold
// TODO: Make configurable
const double min_rotation = 5;
const double min_scale_delta = 0.1;
// Determine direction
switch(tracker->type) {
// Gestures with scale and rotation
case GESTURE_TYPE_PINCH:
if (tracker->rotation > min_rotation) {
result->directions |= GESTURE_DIRECTION_CLOCKWISE;
}
if (tracker->rotation < -min_rotation) {
result->directions |= GESTURE_DIRECTION_COUNTERCLOCKWISE;
}
if (tracker->scale > (1.0 + min_scale_delta)) {
result->directions |= GESTURE_DIRECTION_OUTWARD;
}
if (tracker->scale < (1.0 - min_scale_delta)) {
result->directions |= GESTURE_DIRECTION_INWARD;
}
__attribute__ ((fallthrough));
// Gestures with dx and dy
case GESTURE_TYPE_SWIPE:
if (fabs(tracker->dx) > fabs(tracker->dy)) {
if (tracker->dx > 0) {
result->directions |= GESTURE_DIRECTION_RIGHT;
} else {
result->directions |= GESTURE_DIRECTION_LEFT;
}
} else {
if (tracker->dy > 0) {
result->directions |= GESTURE_DIRECTION_DOWN;
} else {
result->directions |= GESTURE_DIRECTION_UP;
}
}
// Gesture without any direction
case GESTURE_TYPE_HOLD:
break;
// Not tracking any gesture
case GESTURE_TYPE_NONE:
sway_assert(false, "Not tracking any gesture.");
return result;
}
result->type = tracker->type;
result->fingers = tracker->fingers;
char *description = gesture_to_string(result);
sway_log(SWAY_DEBUG, "end tracking gesture: %s", description);
free(description);
tracker->type = GESTURE_TYPE_NONE;
return result;
}