65 lines
1.7 KiB
Dart
65 lines
1.7 KiB
Dart
import 'package:flutter/material.dart';
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/// Animação de entrada (fade + leve deslize para cima) para dar vida a
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/// cards e listas quando aparecem em ecrã. Suporta [delay] para permitir
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/// efeito "staggered" (itens surgindo em sequência) em listas/grades.
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class FadeSlideIn extends StatefulWidget {
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const FadeSlideIn({
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super.key,
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required this.child,
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this.delay = Duration.zero,
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this.duration = const Duration(milliseconds: 420),
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this.offset = const Offset(0, 0.08),
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});
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final Widget child;
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final Duration delay;
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final Duration duration;
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final Offset offset;
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@override
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State<FadeSlideIn> createState() => _FadeSlideInState();
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}
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class _FadeSlideInState extends State<FadeSlideIn>
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with SingleTickerProviderStateMixin {
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late final AnimationController _controller = AnimationController(
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vsync: this,
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duration: widget.duration,
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);
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late final Animation<double> _fade = CurvedAnimation(
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parent: _controller,
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curve: Curves.easeOut,
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);
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late final Animation<Offset> _slide = Tween<Offset>(
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begin: widget.offset,
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end: Offset.zero,
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).animate(CurvedAnimation(parent: _controller, curve: Curves.easeOutCubic));
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@override
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void initState() {
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super.initState();
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if (widget.delay == Duration.zero) {
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_controller.forward();
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} else {
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Future.delayed(widget.delay, () {
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if (mounted) _controller.forward();
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});
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}
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}
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@override
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void dispose() {
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_controller.dispose();
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super.dispose();
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}
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@override
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Widget build(BuildContext context) {
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return FadeTransition(
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opacity: _fade,
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child: SlideTransition(position: _slide, child: widget.child),
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);
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}
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}
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