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Kovid Goyal 2026-01-09 13:23:14 +05:30
parent c0add3198b
commit 1f43a75a07
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1 changed files with 8 additions and 6 deletions
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14
glfw/momentum-scroll.c vendored
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@ -94,6 +94,7 @@ trim_old_samples(monotonic_t now) {
static void
add_velocity(double x, double y) {
x *= s.velocity_scale; y *= s.velocity_scale;
if (x == 0 || x * s.velocity.x >= 0) s.velocity.x += x;
else s.velocity.x = x;
if (y == 0 || y * s.velocity.y >= 0) s.velocity.y += y;
@ -112,7 +113,7 @@ set_velocity_from_samples(monotonic_t now) {
return;
case 1:
deque_pop_front(&s.samples, &ss);
add_velocity(s.velocity_scale * ss.dx, s.velocity_scale * ss.dy);
add_velocity(ss.dx, ss.dy);
return;
}
@ -130,21 +131,22 @@ set_velocity_from_samples(monotonic_t now) {
deque_clear(&s.samples);
if (total_weight <= 0) return;
double dy = total_dy / total_weight, dx = total_dx / total_weight;
add_velocity(dx * s.velocity_scale, dy * s.velocity_scale);
add_velocity(dx, dy);
if (false) timed_debug_print("momentum scroll: event velocity: %.1f final velocity: %.1f\n", dy, s.velocity.y);
}
static void
send_momentum_event(bool is_start) {
double friction = 1.0 - MAX(0, MIN(s.friction, 1.));
s.velocity.x *= friction; s.velocity.y *= friction;
if (fabs(s.velocity.x) < s.min_velocity) s.velocity.x = 0;
if (fabs(s.velocity.y) < s.min_velocity) s.velocity.y = 0;
_GLFWwindow *w = _glfwWindowForId(s.window_id);
if (!w || w != _glfwFocusedWindow()) {
cancel_existing_scroll(true);
return;
}
double friction = 1.0 - MAX(0, MIN(s.friction, 1.));
s.velocity.x *= friction; s.velocity.y *= friction;
if (fabs(s.velocity.x) < s.min_velocity) s.velocity.x = 0;
if (fabs(s.velocity.y) < s.min_velocity) s.velocity.y = 0;
GLFWMomentumType m = is_start ? GLFW_MOMENTUM_PHASE_BEGAN : GLFW_MOMENTUM_PHASE_ACTIVE;
if (s.velocity.x == 0 && s.velocity.y == 0 && !is_start) {
m = GLFW_MOMENTUM_PHASE_ENDED;