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Create one listener that merges the leading and trailing glow controllers and use it in each paint (#11311)

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If a new listener is created for each paint, then the leading and trailing
controllers will accumulate and invoke a list of all those listeners
This commit is contained in:
Jason Simmons 2017-07-19 17:32:39 -07:00 committed by GitHub
parent 741598d848
commit 6dbf2269f0
1 changed files with 5 additions and 1 deletions
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6
packages/flutter/lib/src/widgets/overscroll_indicator.dart
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@ -117,12 +117,14 @@ class GlowingOverscrollIndicator extends StatefulWidget {
class _GlowingOverscrollIndicatorState extends State<GlowingOverscrollIndicator> with TickerProviderStateMixin {
_GlowController _leadingController;
_GlowController _trailingController;
Listenable _leadingAndTrailingListener;
@override
void initState() {
super.initState();
_leadingController = new _GlowController(vsync: this, color: widget.color, axis: widget.axis);
_trailingController = new _GlowController(vsync: this, color: widget.color, axis: widget.axis);
_leadingAndTrailingListener = new Listenable.merge(<Listenable>[_leadingController, _trailingController]);
}
@override
@ -210,6 +212,7 @@ class _GlowingOverscrollIndicatorState extends State<GlowingOverscrollIndicator>
leadingController: widget.showLeading ? _leadingController : null,
trailingController: widget.showTrailing ? _trailingController : null,
axisDirection: widget.axisDirection,
repaint: _leadingAndTrailingListener,
),
child: new RepaintBoundary(
child: widget.child,
@ -444,8 +447,9 @@ class _GlowingOverscrollIndicatorPainter extends CustomPainter {
this.leadingController,
this.trailingController,
this.axisDirection,
Listenable repaint,
}) : super(
repaint: new Listenable.merge(<Listenable>[leadingController, trailingController])
repaint: repaint,
);
/// The controller for the overscroll glow on the side with negative scroll offsets.