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sjk
390
client/lib/shared/widgets/loading_widget.dart
Normal file
390
client/lib/shared/widgets/loading_widget.dart
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import 'package:flutter/material.dart';
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/// 加载组件
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class LoadingWidget extends StatelessWidget {
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final String? message;
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final double? size;
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final Color? color;
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final EdgeInsetsGeometry? padding;
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final bool showMessage;
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const LoadingWidget({
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super.key,
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this.message,
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this.size,
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this.color,
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this.padding,
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this.showMessage = true,
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});
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@override
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Widget build(BuildContext context) {
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final theme = Theme.of(context);
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return Padding(
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padding: padding ?? const EdgeInsets.all(16),
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child: Column(
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mainAxisAlignment: MainAxisAlignment.center,
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mainAxisSize: MainAxisSize.min,
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children: [
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SizedBox(
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width: size ?? 32,
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height: size ?? 32,
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child: CircularProgressIndicator(
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strokeWidth: 3,
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valueColor: AlwaysStoppedAnimation<Color>(
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color ?? theme.colorScheme.primary,
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),
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),
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),
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if (showMessage && message != null) ...[
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const SizedBox(height: 16),
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Text(
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message!,
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style: theme.textTheme.bodyMedium?.copyWith(
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color: theme.colorScheme.onSurface.withOpacity(0.7),
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),
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textAlign: TextAlign.center,
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),
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],
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],
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),
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);
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}
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}
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/// 页面加载组件
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class PageLoadingWidget extends StatelessWidget {
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final String? message;
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final bool showAppBar;
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final String? title;
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const PageLoadingWidget({
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super.key,
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this.message,
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this.showAppBar = false,
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this.title,
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});
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@override
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Widget build(BuildContext context) {
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return Scaffold(
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appBar: showAppBar
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? AppBar(
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title: title != null ? Text(title!) : null,
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backgroundColor: Theme.of(context).colorScheme.surface,
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elevation: 0,
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)
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: null,
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body: Center(
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child: LoadingWidget(
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message: message ?? '加载中...',
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size: 48,
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),
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),
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);
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}
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}
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/// 列表加载组件
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class ListLoadingWidget extends StatelessWidget {
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final int itemCount;
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final double itemHeight;
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final EdgeInsetsGeometry? padding;
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final EdgeInsetsGeometry? margin;
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const ListLoadingWidget({
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super.key,
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this.itemCount = 5,
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this.itemHeight = 80,
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this.padding,
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this.margin,
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});
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@override
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Widget build(BuildContext context) {
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return ListView.builder(
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padding: padding,
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itemCount: itemCount,
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itemBuilder: (context, index) => Container(
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height: itemHeight,
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margin: margin ?? const EdgeInsets.symmetric(
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horizontal: 16,
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vertical: 8,
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),
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child: const ShimmerWidget(),
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),
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);
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}
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}
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/// 骨架屏组件
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class ShimmerWidget extends StatefulWidget {
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final double? width;
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final double? height;
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final BorderRadius? borderRadius;
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final Color? baseColor;
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final Color? highlightColor;
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const ShimmerWidget({
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super.key,
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this.width,
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this.height,
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this.borderRadius,
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this.baseColor,
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this.highlightColor,
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});
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@override
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State<ShimmerWidget> createState() => _ShimmerWidgetState();
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}
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class _ShimmerWidgetState extends State<ShimmerWidget>
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with SingleTickerProviderStateMixin {
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late AnimationController _animationController;
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late Animation<double> _animation;
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@override
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void initState() {
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super.initState();
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_animationController = AnimationController(
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duration: const Duration(milliseconds: 1500),
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vsync: this,
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);
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_animation = Tween<double>(
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begin: -1.0,
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end: 2.0,
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).animate(CurvedAnimation(
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parent: _animationController,
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curve: Curves.easeInOut,
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));
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_animationController.repeat();
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}
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@override
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void dispose() {
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_animationController.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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final theme = Theme.of(context);
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final baseColor = widget.baseColor ?? theme.colorScheme.surfaceVariant;
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final highlightColor = widget.highlightColor ??
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theme.colorScheme.surface.withOpacity(0.8);
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return AnimatedBuilder(
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animation: _animation,
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builder: (context, child) {
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return Container(
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width: widget.width,
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height: widget.height,
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decoration: BoxDecoration(
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borderRadius: widget.borderRadius ?? BorderRadius.circular(8),
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gradient: LinearGradient(
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begin: Alignment.centerLeft,
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end: Alignment.centerRight,
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colors: [
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baseColor,
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highlightColor,
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baseColor,
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],
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stops: [
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_animation.value - 0.3,
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_animation.value,
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_animation.value + 0.3,
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],
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),
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),
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);
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},
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);
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}
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}
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/// 卡片骨架屏
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class CardShimmerWidget extends StatelessWidget {
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final EdgeInsetsGeometry? margin;
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final double? height;
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const CardShimmerWidget({
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super.key,
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this.margin,
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this.height,
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});
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@override
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Widget build(BuildContext context) {
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return Container(
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margin: margin ?? const EdgeInsets.symmetric(
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horizontal: 16,
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vertical: 8,
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),
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padding: const EdgeInsets.all(16),
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decoration: BoxDecoration(
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color: Theme.of(context).colorScheme.surface,
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borderRadius: BorderRadius.circular(12),
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border: Border.all(
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color: Theme.of(context).colorScheme.outline.withOpacity(0.2),
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),
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),
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child: Column(
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crossAxisAlignment: CrossAxisAlignment.start,
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children: [
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Row(
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children: [
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const ShimmerWidget(
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width: 40,
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height: 40,
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borderRadius: BorderRadius.all(Radius.circular(20)),
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),
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const SizedBox(width: 12),
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Expanded(
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child: Column(
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crossAxisAlignment: CrossAxisAlignment.start,
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children: [
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ShimmerWidget(
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width: double.infinity,
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height: 16,
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borderRadius: BorderRadius.circular(4),
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),
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const SizedBox(height: 8),
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ShimmerWidget(
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width: 120,
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height: 12,
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borderRadius: BorderRadius.circular(4),
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),
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],
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),
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),
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],
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),
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if (height != null && height! > 100) ...[
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const SizedBox(height: 16),
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ShimmerWidget(
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width: double.infinity,
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height: 12,
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borderRadius: BorderRadius.circular(4),
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),
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const SizedBox(height: 8),
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ShimmerWidget(
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width: double.infinity,
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height: 12,
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borderRadius: BorderRadius.circular(4),
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),
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const SizedBox(height: 8),
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ShimmerWidget(
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width: 200,
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height: 12,
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borderRadius: BorderRadius.circular(4),
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),
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],
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],
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),
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);
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}
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}
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/// 按钮加载状态
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class LoadingButton extends StatelessWidget {
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final String text;
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final VoidCallback? onPressed;
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final bool isLoading;
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final IconData? icon;
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final Color? backgroundColor;
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final Color? foregroundColor;
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final EdgeInsetsGeometry? padding;
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final double? width;
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final double? height;
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final BorderRadius? borderRadius;
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const LoadingButton({
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super.key,
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required this.text,
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this.onPressed,
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this.isLoading = false,
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this.icon,
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this.backgroundColor,
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this.foregroundColor,
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this.padding,
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this.width,
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this.height,
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this.borderRadius,
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});
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@override
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Widget build(BuildContext context) {
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final theme = Theme.of(context);
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return SizedBox(
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width: width,
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height: height ?? 48,
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child: ElevatedButton(
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onPressed: isLoading ? null : onPressed,
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style: ElevatedButton.styleFrom(
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backgroundColor: backgroundColor ?? theme.colorScheme.primary,
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foregroundColor: foregroundColor ?? theme.colorScheme.onPrimary,
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padding: padding ?? const EdgeInsets.symmetric(
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horizontal: 24,
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vertical: 12,
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),
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shape: RoundedRectangleBorder(
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borderRadius: borderRadius ?? BorderRadius.circular(8),
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),
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elevation: 0,
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),
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child: isLoading
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? SizedBox(
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width: 20,
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height: 20,
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child: CircularProgressIndicator(
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strokeWidth: 2,
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valueColor: AlwaysStoppedAnimation<Color>(
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foregroundColor ?? theme.colorScheme.onPrimary,
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),
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),
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)
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: Row(
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mainAxisSize: MainAxisSize.min,
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children: [
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if (icon != null) ...[
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Icon(icon, size: 18),
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const SizedBox(width: 8),
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],
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Text(
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text,
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style: theme.textTheme.titleSmall?.copyWith(
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fontWeight: FontWeight.w600,
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),
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),
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],
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),
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),
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);
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}
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}
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/// 刷新指示器
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class RefreshIndicatorWidget extends StatelessWidget {
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final Widget child;
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final Future<void> Function() onRefresh;
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final String? refreshText;
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const RefreshIndicatorWidget({
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super.key,
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required this.child,
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required this.onRefresh,
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this.refreshText,
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});
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@override
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Widget build(BuildContext context) {
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return RefreshIndicator(
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onRefresh: onRefresh,
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color: Theme.of(context).colorScheme.primary,
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backgroundColor: Theme.of(context).colorScheme.surface,
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child: child,
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);
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}
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}
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