新增笔记功能 图标更新
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import 'package:flutter/material.dart';
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import '../../models/note.dart';
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/// 目录选择面板
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///
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/// 从底部弹出，展示「全部 / 未分类 / 目录树」三层结构。
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/// 选中后 pop 出对应的 [NoteLocation]；直接关掉则返回 null。
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class FolderPickerSheet extends StatefulWidget {
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const FolderPickerSheet({
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super.key,
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required this.tree,
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required this.current,
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this.title = '选择目录',
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this.showAll = true,
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});
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final FolderTree tree;
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final NoteLocation current;
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final String title;
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/// 是否显示「全部」这一项。
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/// 给笔记选目标目录时要关掉 —— 「全部」不是一个能存放笔记的位置。
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final bool showAll;
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/// 弹出面板的便捷方法
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static Future<NoteLocation?> show(
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BuildContext context, {
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required FolderTree tree,
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required NoteLocation current,
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String title = '选择目录',
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bool showAll = true,
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}) {
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return showModalBottomSheet<NoteLocation>(
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context: context,
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backgroundColor: Colors.white,
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isScrollControlled: true,
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shape: const RoundedRectangleBorder(
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borderRadius: BorderRadius.vertical(top: Radius.circular(20)),
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),
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builder: (_) => FolderPickerSheet(
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tree: tree,
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current: current,
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title: title,
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showAll: showAll,
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),
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);
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}
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@override
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State<FolderPickerSheet> createState() => _FolderPickerSheetState();
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}
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class _FolderPickerSheetState extends State<FolderPickerSheet> {
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final Set<int> _expanded = {};
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@override
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void initState() {
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super.initState();
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// 默认展开当前所在目录的所有上级，用户一眼能看到自己在哪
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if (widget.current.scope == NoteScope.folder && widget.current.folderId != null) {
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final path = widget.tree.findPath(widget.current.folderId!);
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if (path != null) {
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for (final node in path) {
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_expanded.add(node.id);
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}
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}
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}
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}
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bool _isCurrent(NoteScope scope, int? folderId) {
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if (widget.current.scope != scope) return false;
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if (scope != NoteScope.folder) return true;
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return widget.current.folderId == folderId;
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}
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@override
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Widget build(BuildContext context) {
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return SafeArea(
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child: ConstrainedBox(
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constraints: BoxConstraints(
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maxHeight: MediaQuery.of(context).size.height * 0.75,
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),
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child: Column(
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mainAxisSize: MainAxisSize.min,
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children: [
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const SizedBox(height: 10),
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Container(
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width: 40,
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height: 4,
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decoration: BoxDecoration(
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color: const Color(0xFFE0D6CC),
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borderRadius: BorderRadius.circular(2),
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),
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),
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Padding(
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padding: const EdgeInsets.fromLTRB(20, 14, 20, 6),
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child: Align(
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alignment: Alignment.centerLeft,
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child: Text(
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widget.title,
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style: const TextStyle(
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fontSize: 16,
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fontWeight: FontWeight.w600,
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color: Color(0xFF5D4037),
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),
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),
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),
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),
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Flexible(
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child: ListView(
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shrinkWrap: true,
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padding: const EdgeInsets.fromLTRB(12, 4, 12, 20),
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children: [
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if (widget.showAll)
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_row(
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icon: '📚',
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name: '全部',
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count: widget.tree.totalCount,
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depth: 0,
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selected: _isCurrent(NoteScope.all, null),
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onTap: () => Navigator.pop(context, NoteLocation.all),
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),
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_row(
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icon: '📥',
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name: '未分类',
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count: widget.tree.uncategorizedCount,
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depth: 0,
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selected: _isCurrent(NoteScope.uncategorized, null),
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onTap: () => Navigator.pop(context, NoteLocation.uncategorized),
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),
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if (widget.tree.folders.isNotEmpty)
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const Padding(
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padding: EdgeInsets.fromLTRB(8, 12, 8, 4),
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child: Divider(height: 1, color: Color(0xFFF0E6D8)),
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),
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...widget.tree.folders.map((n) => _buildNode(n, 0)),
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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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/// 递归渲染目录节点
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Widget _buildNode(FolderNode node, int depth) {
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final hasChildren = node.children.isNotEmpty;
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final open = _expanded.contains(node.id);
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return Column(
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mainAxisSize: MainAxisSize.min,
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children: [
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_row(
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icon: (open && hasChildren) ? '📂' : '📁',
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name: node.name,
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count: node.noteCount,
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depth: depth,
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selected: _isCurrent(NoteScope.folder, node.id),
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trailing: hasChildren
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? GestureDetector(
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behavior: HitTestBehavior.opaque,
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onTap: () {
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setState(() {
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if (open) {
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_expanded.remove(node.id);
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} else {
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_expanded.add(node.id);
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}
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});
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},
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child: Padding(
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padding: const EdgeInsets.symmetric(horizontal: 6, vertical: 8),
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child: AnimatedRotation(
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turns: open ? 0.25 : 0,
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duration: const Duration(milliseconds: 150),
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child: const Icon(
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Icons.chevron_right,
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size: 18,
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color: Color(0xFFBCAAA4),
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),
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),
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),
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)
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: null,
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onTap: () => Navigator.pop(
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context,
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NoteLocation(
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scope: NoteScope.folder,
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folderId: node.id,
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folderName: node.name,
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),
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),
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),
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if (open && hasChildren)
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...node.children.map((c) => _buildNode(c, depth + 1)),
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],
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);
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}
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Widget _row({
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required String icon,
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required String name,
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required int count,
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required int depth,
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required bool selected,
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required VoidCallback onTap,
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Widget? trailing,
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}) {
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return Padding(
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padding: EdgeInsets.only(left: depth * 18.0),
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child: InkWell(
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onTap: onTap,
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borderRadius: BorderRadius.circular(10),
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child: Container(
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padding: const EdgeInsets.symmetric(horizontal: 10, vertical: 10),
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decoration: BoxDecoration(
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color: selected ? const Color(0xFFFFF3E6) : null,
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borderRadius: BorderRadius.circular(10),
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),
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child: Row(
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children: [
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Text(icon, style: const TextStyle(fontSize: 15)),
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const SizedBox(width: 10),
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Expanded(
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child: Text(
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name,
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maxLines: 1,
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overflow: TextOverflow.ellipsis,
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style: TextStyle(
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fontSize: 14.5,
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fontWeight: selected ? FontWeight.w600 : FontWeight.normal,
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color: selected ? const Color(0xFFC8956E) : const Color(0xFF5D4037),
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),
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),
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),
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Text(
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'$count',
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style: const TextStyle(fontSize: 12, color: Color(0xFFBCAAA4)),
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),
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?trailing,
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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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