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Adjust the SpringForce tolerance, used by Drawer and Dismissable.

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They settle much faster after you fling them now.
This commit is contained in:
Matt Perry
2015-08-06 15:40:15 -04:00
parent 9d2325ead1
commit 6e97dc02ba
1 changed files with 9 additions and 6 deletions
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sky/packages/sky/lib/animation/forces.dart
+9 -6
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@@ -13,22 +13,25 @@ abstract class Force {
class SpringForce extends Force {
SpringForce(this.spring, {this.left: 0.0, this.right: 1.0});
// We overshoot the target by this distance, but stop the simulation when
// the spring gets within this distance (regardless of how fast it's moving).
// This causes the spring to settle a bit faster than it otherwise would.
static final Tolerance tolerance =
new Tolerance(velocity: double.INFINITY, distance: 0.01);
final SpringDescription spring;
// Where to put the spring's resting point when releasing left or right,
// respectively.
final double left, right;
Simulation release(double position, double velocity, Direction direction) {
// Target just past the endpoint, because the animation will stop once the
// Spring gets within the epsilon, and we want to stop at the endpoint.
double target = direction == Direction.reverse ?
this.left - _kEpsilon : this.right + _kEpsilon;
return new SpringSimulation(spring, position, target, velocity);
this.left - tolerance.distance : this.right + tolerance.distance;
return new SpringSimulation(spring, position, target, velocity)
..tolerance = tolerance;
}
}
final SpringDescription _kDefaultSpringDesc =
new SpringDescription.withDampingRatio(mass: 1.0, springConstant: 500.0, ratio: 1.0);
final SpringForce kDefaultSpringForce = new SpringForce(_kDefaultSpringDesc);
const double _kEpsilon = 0.001;