马良AI写作初始化仓库
This commit is contained in:
邓滨杰
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import 'package:flutter/material.dart';
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import 'package:ainoval/blocs/editor/editor_bloc.dart' as editor_bloc;
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import 'package:ainoval/utils/logger.dart';
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/// 卷轴导航按钮组件
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/// 显示上一卷/下一卷/添加新卷按钮
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class VolumeNavigationButtons extends StatelessWidget {
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// 位置控制
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final bool isTop;
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// 卷状态控制
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final bool isFirstAct;
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final bool isLastAct;
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final String? previousActTitle;
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final String? nextActTitle;
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// 滚动状态
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final bool hasReachedStart;
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final bool hasReachedEnd;
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// 加载状态
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final bool isLoadingMore;
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// 回调
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final VoidCallback? onPreviousAct;
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final VoidCallback? onNextAct;
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final VoidCallback? onAddNewAct;
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const VolumeNavigationButtons({
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Key? key,
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required this.isTop,
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required this.isFirstAct,
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required this.isLastAct,
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this.previousActTitle,
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this.nextActTitle,
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required this.hasReachedStart,
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required this.hasReachedEnd,
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this.isLoadingMore = false,
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this.onPreviousAct,
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this.onNextAct,
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this.onAddNewAct,
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}) : super(key: key);
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@override
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Widget build(BuildContext context) {
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// 始终记录底部按钮显示条件，方便调试
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if (!isTop) {
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AppLogger.i('VolumeNavigationButtons', '底部按钮条件: isLastAct=$isLastAct, hasReachedEnd=$hasReachedEnd');
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}
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// 上方按钮显示条件：
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// 1. 是顶部按钮位置 (isTop)
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// 2. 不能是第一卷 (isFirstAct == false)
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final bool shouldShowTopButton = isTop && !isFirstAct;
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// 下方按钮显示条件：
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// 1. 是底部按钮位置
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final bool shouldShowBottomButton = !isTop;
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// 确定按钮类型
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// 顶部按钮永远是"上一卷"
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// 底部按钮在最后一卷时是"添加新卷"，否则是"下一卷"
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return AnimatedSwitcher(
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duration: const Duration(milliseconds: 300),
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transitionBuilder: (Widget child, Animation<double> animation) {
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return FadeTransition(
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opacity: animation,
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child: SlideTransition(
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position: Tween<Offset>(
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begin: Offset(0, isTop ? -0.5 : 0.5),
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end: Offset.zero,
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).animate(animation),
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child: child,
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),
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);
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},
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child: (shouldShowTopButton || shouldShowBottomButton)
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? _buildButton(
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context,
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isTop: isTop,
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)
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: const SizedBox.shrink(),
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);
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}
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Widget _buildButton(
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BuildContext context, {
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required bool isTop,
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}) {
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final themeData = Theme.of(context);
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// 安全地获取前一个和下一个卷的信息
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final String? prevVolumeName = isFirstAct ? null : previousActTitle;
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final String? nextVolumeName = this.isLastAct ? null : this.nextActTitle;
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// 按钮文本
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late final String buttonText;
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late final IconData buttonIcon;
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late final VoidCallback? onPressed;
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if (isTop) {
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// 顶部按钮：上一卷
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if (prevVolumeName == null) {
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buttonText = '返回首卷';
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} else {
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String displayName = prevVolumeName;
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if (displayName.length > 10) {
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displayName = displayName.substring(0, 10) + '...';
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}
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buttonText = '上一卷：$displayName';
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}
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buttonIcon = Icons.arrow_upward_rounded;
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onPressed = onPreviousAct;
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} else {
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if (this.isLastAct) {
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// 底部按钮：如果是最后一卷，则为"添加新卷"
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buttonText = '添加新卷';
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buttonIcon = Icons.add_rounded;
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onPressed = onAddNewAct;
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} else {
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// 底部按钮：如果不是最后一卷，则为"下一卷"
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if (nextVolumeName == null) {
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buttonText = '下一卷';
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} else {
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String displayName = nextVolumeName;
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if (displayName.length > 10) {
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displayName = displayName.substring(0, 10) + '...';
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}
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buttonText = '下一卷：$displayName';
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}
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buttonIcon = Icons.arrow_downward_rounded;
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onPressed = onNextAct;
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}
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}
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// 构建按钮
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return Padding(
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padding: EdgeInsets.only(
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top: isTop ? 16.0 : 0.0,
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bottom: isTop ? 0.0 : 16.0,
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),
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child: Container(
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height: 60,
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padding: const EdgeInsets.symmetric(horizontal: 8.0),
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decoration: BoxDecoration(
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color: themeData.cardColor,
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borderRadius: BorderRadius.circular(30),
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boxShadow: [
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BoxShadow(
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color: Colors.black.withOpacity(0.1),
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blurRadius: 8,
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offset: const Offset(0, 2),
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),
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],
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),
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child: Material(
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color: Colors.transparent,
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child: InkWell(
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borderRadius: BorderRadius.circular(30),
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onTap: isLoadingMore ? null : onPressed,
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child: Padding(
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padding: const EdgeInsets.symmetric(horizontal: 16.0, vertical: 8.0),
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child: Row(
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mainAxisSize: MainAxisSize.min,
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children: [
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isLoadingMore
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? const SizedBox(
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width: 24,
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height: 24,
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child: CircularProgressIndicator(
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strokeWidth: 2,
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),
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)
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: Icon(
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buttonIcon,
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color: themeData.colorScheme.primary,
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),
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const SizedBox(width: 8),
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Text(
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isLoadingMore ? '加载中...' : buttonText,
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style: TextStyle(
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fontSize: 16,
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fontWeight: FontWeight.w500,
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color: themeData.colorScheme.onSurface,
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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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);
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}
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// 构建加载指示器
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Widget _buildLoadingIndicator(ThemeData theme, String loadingText) {
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return Row(
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mainAxisSize: MainAxisSize.min,
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children: [
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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: 3,
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valueColor: AlwaysStoppedAnimation<Color>(theme.colorScheme.primary),
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),
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),
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const SizedBox(width: 12),
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Text(
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loadingText,
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style: TextStyle(
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color: theme.colorScheme.primary,
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fontWeight: FontWeight.w500,
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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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