58 lines
1.6 KiB
Dart
58 lines
1.6 KiB
Dart
import 'package:flutter/material.dart';
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class AppBarAni extends StatelessWidget implements PreferredSizeWidget {
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const AppBarAni({
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required this.child,
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required this.controller,
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required this.visible,
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this.position,
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Key? key,
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}) : super(key: key);
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final PreferredSizeWidget child;
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final AnimationController controller;
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final bool visible;
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final String? position;
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@override
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Size get preferredSize => child.preferredSize;
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@override
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Widget build(BuildContext context) {
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visible ? controller.reverse() : controller.forward();
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return SlideTransition(
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position: Tween<Offset>(
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begin: Offset.zero,
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end: Offset(0, position! == 'top' ? -1 : 1),
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).animate(CurvedAnimation(
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parent: controller,
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curve: Curves.linear,
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)),
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child: Container(
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decoration: BoxDecoration(
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gradient: position! == 'top'
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? const LinearGradient(
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begin: Alignment.bottomCenter,
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end: Alignment.topCenter,
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colors: <Color>[
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Colors.transparent,
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Colors.black54,
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],
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tileMode: TileMode.mirror,
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)
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: const LinearGradient(
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begin: Alignment.topCenter,
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end: Alignment.bottomCenter,
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colors: <Color>[
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Colors.transparent,
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Colors.black54,
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],
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tileMode: TileMode.mirror,
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),
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),
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child: child,
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),
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);
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}
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}
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