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Kovid Goyal
2026-01-09 14:44:40 +05:30
parent 8fd0909e4a
commit dd9c61e5f6
2 changed files with 6 additions and 6 deletions
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10
glfw/momentum-scroll.c vendored
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@@ -20,7 +20,7 @@ typedef struct ScrollSample {
typedef enum ScrollerState { NONE, PHYSICAL_EVENT_IN_PROGRESS, MOMENTUM_IN_PROGRESS } ScrollerState;
typedef struct MomentumScroller {
double friction, // Deceleration factor (0-1, lower = longer coast)
double friction, // Deceleration inverse factor (0-1, higher = longer coast)
min_velocity, // Minimum velocity before stopping
max_velocity, // Maximum velocity to prevent runaway scrolling
velocity_scale; // Scale factor for initial velocity
@@ -39,7 +39,7 @@ typedef struct MomentumScroller {
} MomentumScroller;
static const MomentumScroller defaults = {
.friction = 0.04,
.friction = 0.96,
.min_velocity = 0.5,
.max_velocity = 100,
.timer_interval = 10,
@@ -49,8 +49,9 @@ static MomentumScroller s = defaults;
GLFWAPI void
glfwConfigureMomentumScroller(double friction, double min_velocity, double max_velocity, unsigned timer_interval_ms) {
s.timer_interval = timer_interval_ms ? ms_to_monotonic_t(timer_interval_ms) : defaults.timer_interval;
s.friction = friction < 0 ? defaults.friction : MAX(0, MIN(friction, 1));
#define S(w) s.w = w >= 0 ? w : defaults.w
S(friction); S(min_velocity); S(max_velocity);
S(min_velocity); S(max_velocity);
#undef S
}
@@ -140,8 +141,7 @@ send_momentum_event(bool is_start) {
cancel_existing_scroll(true);
return;
}
double friction = 1.0 - MAX(0, MIN(s.friction, 1.));
s.velocity.x *= friction; s.velocity.y *= friction;
s.velocity.x *= s.friction; s.velocity.y *= s.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;