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Fix render problem on Slider (#15039)

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Fixes a small rendering problem when dragging the slider, as well as a couple of small bugs (de-duping of value changes, and actually using a parameter passed to _unlerp).
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Greg Spencer 2018-03-01 16:25:21 -08:00 committed by GitHub
parent b90659cd30
commit a1d2443e7b
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 10 additions and 6 deletions
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16
packages/flutter/lib/src/material/slider.dart
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@ -239,8 +239,10 @@ class _SliderState extends State<Slider> with TickerProviderStateMixin {
void _handleChanged(double value) {
assert(widget.onChanged != null);
final double transformedValue = _lerp(value);
widget.onChanged(transformedValue);
final double lerpValue = _lerp(value);
if (lerpValue != widget.value) {
widget.onChanged(lerpValue);
}
}
// Returns a number between min and max, proportional to value, which must
@ -255,7 +257,7 @@ class _SliderState extends State<Slider> with TickerProviderStateMixin {
double _unlerp(double value) {
assert(value <= widget.max);
assert(value >= widget.min);
return widget.max > widget.min ? (widget.value - widget.min) / (widget.max - widget.min) : 0.0;
return widget.max > widget.min ? (value - widget.min) / (widget.max - widget.min) : 0.0;
}
@override
@ -380,12 +382,13 @@ class _RenderSlider extends RenderBox {
..team = team
..onStart = _handleDragStart
..onUpdate = _handleDragUpdate
..onEnd = _handleDragEnd;
..onEnd = _handleDragEnd
..onCancel = _endInteraction;
_tap = new TapGestureRecognizer()
..team = team
..onTapCancel = _endInteraction
..onTapDown = _handleTapDown
..onTapUp = _handleTapUp;
..onTapUp = _handleTapUp
..onTapCancel = _endInteraction;
_reaction = new CurvedAnimation(parent: state.reactionController, curve: Curves.fastOutSlowIn)
..addListener(markNeedsPaint);
state.enableController.value = isInteractive ? 1.0 : 0.0;
@ -586,6 +589,7 @@ class _RenderSlider extends RenderBox {
break;
}
onChanged(_discretize(_currentDragValue));
markNeedsPaint();
}
}