Class
MaplibreNativeFfiMomentumDecay
Description [src]
final class MaplibreNativeFfi.MomentumDecay : GObject.Object
{
/* No available fields */
}How one part of a gesture’s momentum slows from its release speed.
Speeds and distances are in the part’s unit: logical pixels for pan, zoom
levels for zoom, and degrees for bearing and pitch. A setting whose bit isn’t
set takes the part’s default, which MaplibreNativeFfiGestureMomentum lists.
min_speed is finite and not negative, and every other number is finite and
positive. A friction decay can serve every release, as a preset that matches
a platform’s scrolling. An eased glide takes its direction from the part’s
velocity, and its distance and duration from the caller’s plan.
A member that a has_ method reports on is unset until its property or
setter sets it.
See mln_momentum_decay in the
C API reference.
Constructors
maplibre_native_ffi_momentum_decay_new
Creates a MaplibreNativeFfiMomentumDecay whose members are zero, empty, or unset.
Instance methods
maplibre_native_ffi_momentum_decay_get_half_life_ms
Gets MaplibreNativeFfiMomentumDecay:half-life-ms.
maplibre_native_ffi_momentum_decay_get_max_distance
Gets MaplibreNativeFfiMomentumDecay:max-distance.
maplibre_native_ffi_momentum_decay_has_distance
Whether MaplibreNativeFfiMomentumDecay:distance is set.
maplibre_native_ffi_momentum_decay_has_duration_ms
Whether MaplibreNativeFfiMomentumDecay:duration-ms is set.
maplibre_native_ffi_momentum_decay_has_half_life_ms
Whether MaplibreNativeFfiMomentumDecay:half-life-ms is set.
maplibre_native_ffi_momentum_decay_has_max_distance
Whether MaplibreNativeFfiMomentumDecay:max-distance is set.
maplibre_native_ffi_momentum_decay_has_max_speed
Whether MaplibreNativeFfiMomentumDecay:max-speed is set.
maplibre_native_ffi_momentum_decay_has_min_speed
Whether MaplibreNativeFfiMomentumDecay:min-speed is set.
maplibre_native_ffi_momentum_decay_has_stop_speed
Whether MaplibreNativeFfiMomentumDecay:stop-speed is set.
maplibre_native_ffi_momentum_decay_set_half_life_ms
Sets MaplibreNativeFfiMomentumDecay:half-life-ms.
maplibre_native_ffi_momentum_decay_set_max_distance
Sets MaplibreNativeFfiMomentumDecay:max-distance.
Properties
MaplibreNativeFfi.MomentumDecay:distance
Required for MAPLIBRE_NATIVE_FFI_MOMENTUM_DECAY_MODEL_EASE.
MaplibreNativeFfi.MomentumDecay:duration-ms
Required for MAPLIBRE_NATIVE_FFI_MOMENTUM_DECAY_MODEL_EASE.
MaplibreNativeFfi.MomentumDecay:easing
For MAPLIBRE_NATIVE_FFI_MOMENTUM_DECAY_MODEL_EASE, the share of distance
covered over the share of duration_ms. Its control points are between 0 and
1, so the glide never passes its distance. Defaults to (0, 0, 0.25, 1), the
curve that camera animations ease along by default. Android’s scroll fling
follows (0.175, 0.5, 0.35, 1).
MaplibreNativeFfi.MomentumDecay:half-life-ms
For MAPLIBRE_NATIVE_FFI_MOMENTUM_DECAY_MODEL_FRICTION, how long the speed
takes to halve.
MaplibreNativeFfi.MomentumDecay:max-distance
The farthest the part moves. A friction release that would move farther starts slower, so it ends sooner, and a planned glide moves at most this far over its duration.
MaplibreNativeFfi.MomentumDecay:max-speed
For MAPLIBRE_NATIVE_FFI_MOMENTUM_DECAY_MODEL_FRICTION, a faster release
counts as this.
MaplibreNativeFfi.MomentumDecay:stop-speed
For MAPLIBRE_NATIVE_FFI_MOMENTUM_DECAY_MODEL_FRICTION, the speed at which
it ends.
Signals
Signals inherited from GObject (1)
GObject::notify
The notify signal is emitted on an object when one of its properties has its value set through g_object_set_property(), g_object_set(), et al.