scroll_builder

Description:

scroll builder

ScrollBuilder #
A very simple Flutter widget that makes it easier to implement effects based on a scroll offset. For example, widgets in a SliverAppBar.
Example #
SliverAppBar(
collapsedHeight: collapsedHeight,
expandedHeight: expandedHeight,
titleSpacing: 0,
pinned: true,
flexibleSpace: FlexibleSpaceBar(
expandedTitleScale: 1.0,
title: ScrollBuilder(
scrollController: controller,
threshold: scrollAmountUntilCollapsed,
builder: (context, fraction, child) {
return Transform.translate(
offset: Offset(
0,
-24 * Curves.easeOutCubic.transform(1 - fraction),
),
child: Transform.rotate(
angle: pi * 4 * Curves.easeInOut.transform(fraction),
child: ImageFiltered(
imageFilter: ImageFilter.blur(
sigmaX: fraction != 0 && fraction != 1 ? 0.5 : 0,
sigmaY: fraction != 0 && fraction != 1 ? 0.5 : 0,
),
child: Text(
'News',
style: TextStyle(
fontSize: Tween<double>(
begin: 18,
end: 56,
).transform(1 - fraction),
fontWeight: FontWeight.lerp(
FontWeight.w200,
FontWeight.w500,
fraction,
),
),
),
),
),
);
},
),
),
),
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Result #