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@@ -0,0 +1,496 @@
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+import 'package:chicken_farm/components/vb_select.dart';
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+import 'package:chicken_farm/core/utils/logger.dart';
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+import 'package:flutter/material.dart';
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+
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+/// 搜索API函数签名
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+/// T 为数据类型
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+typedef SearchApiFunction<T> =
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+ Future<Map<String, dynamic>> Function({
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+ required Map<String, dynamic> queryParams,
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+ });
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+
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+/// 选项转换器,将数据类型T转换为SelectOption
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+typedef SelectOptionConverter<T> = SelectOption Function(T data);
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+
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+/// 搜索选择组件
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+class VberSearchSelect<T> extends StatefulWidget {
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+ /// 搜索API函数
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+ final SearchApiFunction<T> searchApi;
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+
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+ /// 数据转换方法,将原始数据转换为SelectOption
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+ final SelectOptionConverter<T> converter;
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+
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+ /// 根据value获取对应label的函数
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+ final Future<String?> Function(String?)? getValueLabel;
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+
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+ /// 当前选中的值
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+ final String? value;
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+
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+ /// 值改变回调
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+ final ValueChanged<String?>? onChanged;
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+
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+ /// 提示文字
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+ final String? hint;
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+
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+ /// 是否启用
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+ final bool enabled;
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+
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+ /// 每页数据条数
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+ final int pageSize;
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+
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+ /// 额外参数,用于传递给搜索API
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+ final Map<String, dynamic>? extraParams;
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+
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+ const VberSearchSelect({
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+ super.key,
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+ required this.searchApi,
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+ required this.converter,
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+ this.getValueLabel,
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+ this.value,
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+ this.onChanged,
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+ this.hint,
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+ this.enabled = true,
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+ this.pageSize = 3,
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+ this.extraParams,
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+ });
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+
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+ @override
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+ State<VberSearchSelect<T>> createState() => _VberSearchSelectState<T>();
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+}
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+
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+class _VberSearchSelectState<T> extends State<VberSearchSelect<T>>
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+ with SingleTickerProviderStateMixin {
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+ final TextEditingController _textController = TextEditingController();
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+ final TextEditingController _searchController = TextEditingController();
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+ final FocusNode _focusNode = FocusNode();
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+ final FocusNode _searchFocusNode = FocusNode(); // 添加搜索框的FocusNode
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+ final LayerLink _layerLink = LayerLink();
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+ OverlayEntry? _overlayEntry;
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+ List<T> _items = [];
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+ bool _isLoading = false;
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+ bool _isOverlayVisible = false;
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+ String? _selectedValue;
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+ SelectOption? _selectedOption; // 新增:用来存储选中的选项
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+ int _currentPage = 1;
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+ bool _hasMore = true;
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+ String _lastSearchText = '';
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+
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+ @override
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+ void initState() {
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+ super.initState();
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+ _selectedValue = widget.value;
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+ _initTextController();
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+ _focusNode.addListener(_onFocusChange);
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+ }
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+
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+ /// 初始化文本控制器
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+ void _initTextController() async {
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+ if (widget.value != null && widget.getValueLabel != null) {
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+ try {
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+ final label = await widget.getValueLabel!(widget.value);
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+ if (mounted) {
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+ setState(() {
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+ _textController.text = label ?? widget.value ?? '';
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+ });
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+ }
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+ } catch (e) {
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+ logger.e('Failed to get label for value: ${widget.value}', e);
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+ }
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+ }
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+ }
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+
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+ @override
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+ void didUpdateWidget(covariant VberSearchSelect<T> oldWidget) {
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+ super.didUpdateWidget(oldWidget);
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+ // 当外部传入的value发生变化时,同步更新内部状态
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+ if (oldWidget.value != widget.value) {
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+ _syncValueAndText(widget.value);
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+ }
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+ }
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+
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+ /// 同步外部value和内部_selectedValue以及_textController.text
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+ void _syncValueAndText(String? newValue) async {
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+ setState(() {
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+ _selectedValue = newValue;
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+ });
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+
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+ // 优先使用存储的选项
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+ String? label;
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+ if (_selectedOption != null && _selectedOption!.value == newValue) {
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+ label = _selectedOption!.label;
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+ }
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+
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+ // 尝试在现有选项中查找匹配的标签
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+ if (label == null && newValue != null) {
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+ for (var item in _items) {
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+ final option = widget.converter(item);
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+ if (option.value == newValue) {
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+ label = option.label;
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+ break;
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+ }
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+ }
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+ }
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+
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+ // 如果在现有选项中没找到,且提供了getValueLabel函数,则尝试通过它获取
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+ if (label == null && newValue != null && widget.getValueLabel != null) {
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+ try {
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+ label = await widget.getValueLabel!(newValue);
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+ } catch (e) {
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+ logger.e('Failed to get label for value: $newValue', e);
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+ }
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+ }
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+
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+ // 更新文本显示控件
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+ if (mounted) {
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+ setState(() {
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+ // 优先级: 找到的label > value本身 > 空字符串
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+ _textController.text = label ?? newValue ?? '';
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+ });
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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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+ _textController.dispose();
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+ _searchController.dispose();
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+ _focusNode.removeListener(_onFocusChange);
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+ _focusNode.dispose();
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+ _searchFocusNode.dispose(); // 释放搜索框的FocusNode
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+ _overlayEntry?.remove();
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+ super.dispose();
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+ }
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+
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+ void _onFocusChange() {
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+ // 只有当_focusNode获得焦点且组件启用时才显示弹出层
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+ if (_focusNode.hasFocus && widget.enabled) {
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+ // 添加一个微小的延迟,避免焦点竞争
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+ Future.microtask(() {
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+ if (_focusNode.hasFocus && mounted) {
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+ _showOverlay();
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+ }
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+ });
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+ }
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+ }
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+
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+ void _showOverlay() {
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+ if (_isOverlayVisible) return;
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+
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+ _overlayEntry = _createOverlayEntry();
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+ Overlay.of(context).insert(_overlayEntry!);
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+ _isOverlayVisible = true;
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+
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+ // 清空搜索框
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+ _searchController.clear();
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+ _items.clear();
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+ _currentPage = 1;
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+ _hasMore = true;
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+ _lastSearchText = '';
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+
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+ _performSearch('', (callback) => setState(() => callback()));
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+
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+ WidgetsBinding.instance.addPostFrameCallback((_) {
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+ if (_searchFocusNode.canRequestFocus && mounted) {
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+ _searchFocusNode.requestFocus();
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+ }
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+ });
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+ }
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+
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+ void _hideOverlay() {
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+ _overlayEntry?.remove();
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+ _overlayEntry = null;
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+ _isOverlayVisible = false;
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+ _searchFocusNode.unfocus();
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+ _lastSearchText = '';
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+ _items.clear();
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+ }
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+
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+ OverlayEntry _createOverlayEntry() {
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+ // 获取选择框的大小和位置
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+ final renderBox = context.findRenderObject() as RenderBox;
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+ final size = renderBox.size;
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+ final offset = renderBox.localToGlobal(Offset.zero);
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+
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+ return OverlayEntry(
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+ builder: (context) => Positioned(
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+ left: offset.dx,
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+ top: offset.dy + size.height + 5,
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+ width: size.width,
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+ child: Material(
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+ elevation: 4,
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+ borderRadius: BorderRadius.circular(4),
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+ child: Container(
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+ constraints: BoxConstraints(
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+ maxHeight: MediaQuery.of(context).size.height * 0.4,
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+ ),
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+ child: StatefulBuilder(
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+ builder: (context, setState) {
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+ return Column(
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+ mainAxisSize: MainAxisSize.min,
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+ children: [
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+ Padding(
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+ padding: const EdgeInsets.all(16.0),
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+ child: TextField(
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+ key: ValueKey('search_text_field_${widget.hint ?? ''}_${UniqueKey().toString()}'),
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+ controller: _searchController,
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+ focusNode: _searchFocusNode,
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+ autofocus: false,
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+ decoration: InputDecoration(
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+ hintText: '请输入${widget.hint}搜索关键词',
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+ contentPadding: EdgeInsets.symmetric(
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+ horizontal: 12,
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+ vertical: 8,
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+ ),
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+ border: OutlineInputBorder(
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+ borderRadius: BorderRadius.circular(4),
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+ ),
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+ isDense: true,
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+ ),
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+ onChanged: (value) {
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+ Future.delayed(const Duration(milliseconds: 300), () {
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+ if (_lastSearchText != _searchController.text) {
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+ _lastSearchText = _searchController.text;
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+ _items.clear();
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+ _currentPage = 1;
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+ _hasMore = true;
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+ _performSearch(_searchController.text, setState);
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+ } else {}
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+ });
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+ },
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+ ),
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+ ),
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+ if (_isLoading && _items.isEmpty)
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+ Padding(
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+ padding: const EdgeInsets.all(16.0),
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+ child: Center(child: CircularProgressIndicator()),
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+ )
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+ else if (!_isLoading && _items.isEmpty)
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+ Padding(
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+ padding: const EdgeInsets.all(16.0),
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+ child: Center(
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+ child: Text(
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+ '没有查询到结果',
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+ style: TextStyle(color: Colors.grey, fontSize: 14),
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+ ),
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+ ),
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+ )
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+ else
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+ Flexible(
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+ child: NotificationListener<ScrollNotification>(
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+ onNotification: (notification) {
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+ if (notification.metrics.pixels ==
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+ notification.metrics.maxScrollExtent &&
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+ _hasMore &&
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+ !_isLoading) {
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+ _loadMore(setState);
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+ return true;
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+ }
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+ return false;
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+ },
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+ child: Builder(
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+ builder: (BuildContext context) {
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+ return ListView.builder(
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+ padding: EdgeInsets.zero,
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+ shrinkWrap: true,
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+ itemCount: _items.length + (_hasMore ? 1 : 0),
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+ itemBuilder: (context, index) {
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+ if (index == _items.length) {
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+ // 显示加载更多指示器
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+ return Padding(
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+ padding: const EdgeInsets.all(12.0),
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+ child: Center(
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+ child: _isLoading
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+ ? CircularProgressIndicator()
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+ : Text('上拉加载更多'),
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+ ),
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+ );
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+ }
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+ final item = _items[index];
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+ final option = widget.converter(item);
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+ return ListTile(
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+ title: Text(option.label),
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+ onTap: () => _selectItem(option, item),
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+ dense: true,
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+ contentPadding: EdgeInsets.symmetric(
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+ horizontal: 16,
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+ vertical: 4,
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+ ),
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+ visualDensity: VisualDensity.compact,
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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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+ ),
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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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+ void _loadMore(StateSetter overlaySetState) async {
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+ if (!_hasMore || _isLoading) return;
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+
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+ overlaySetState(() {
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+ _isLoading = true;
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+ });
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+
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+ try {
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+ _currentPage++;
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+
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+ final result = await _fetchData(_currentPage);
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+
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+ final List<dynamic> rows = result['rows'] is List ? result['rows'] : [];
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+ final int total = result['total'] is int ? result['total'] : 0;
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+ final newItems = rows.cast<T>().toList();
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+
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+ if (mounted) {
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+ overlaySetState(() {
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+ _items.addAll(newItems);
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+ _hasMore = _items.length < total;
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+ _isLoading = false;
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+ });
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+ }
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+ } catch (e) {
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+ logger.e('加载更多失败:$e');
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+ if (mounted) {
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+ overlaySetState(() {
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+ _currentPage--; // 回退页码
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+ _isLoading = false;
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+ });
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+ }
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+ }
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+ }
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+
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+ void _performSearch(String keyword, StateSetter overlaySetState) async {
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+ overlaySetState(() {
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+ _isLoading = true;
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+ });
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+
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+ try {
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+ _currentPage = 1;
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+ _hasMore = true;
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+
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+ final result = await _fetchData(_currentPage, keyword: keyword);
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+
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+ final List<dynamic> rows = result['rows'] is List ? result['rows'] : [];
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+ final int total = result['total'] is int ? result['total'] : 0;
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+ final newItems = rows.cast<T>().toList();
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+
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+ if (mounted) {
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+ overlaySetState(() {
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+ _items = newItems;
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+ _hasMore = _items.length < total;
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+ _isLoading = false;
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+ });
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+ }
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+ } catch (e) {
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+ logger.e('搜索失败:$e');
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+ if (mounted) {
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+ overlaySetState(() {
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+ _items = [];
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+ _hasMore = false;
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+ _isLoading = false;
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+ });
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+ }
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+ }
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+ }
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+
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+ Future<Map<String, dynamic>> _fetchData(
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+ int pageNum, {
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+ String? keyword,
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+ }) async {
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+ final Map<String, dynamic> queryParams = {
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+ 'pageSize': widget.pageSize,
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+ 'pageNum': pageNum,
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+ };
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+
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+ if (keyword != null) {
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+ queryParams['keyword'] = keyword;
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+ } else if (keyword == null && _searchController.text.isNotEmpty) {
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+ // 如果keyword参数为null但_searchController中有内容,则使用该内容
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+ queryParams['keyword'] = _searchController.text;
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+ }
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+
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+ if (widget.extraParams != null) {
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+ queryParams.addAll(widget.extraParams!);
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+ }
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+
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+ final r = await widget.searchApi(queryParams: queryParams);
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+ return r;
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+ }
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+
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+ void _selectItem(SelectOption option, T item) {
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+ setState(() {
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+ _textController.text = option.label;
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+ _selectedValue = option.value;
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+ _selectedOption = option; // 保存选中的选项
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+
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+ // 检查当前选中的项是否已经在列表中,如果不在则添加到列表开头
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+ // 这样可以在后续通过value同步label时找到对应的项
|
|
|
+ bool itemExists = _items.any((element) {
|
|
|
+ final elementOption = widget.converter(element);
|
|
|
+ return elementOption.value == option.value;
|
|
|
+ });
|
|
|
+
|
|
|
+ if (!itemExists) {
|
|
|
+ // 将选中项插入到列表开头,方便快速查找
|
|
|
+ _items.insert(0, item);
|
|
|
+ }
|
|
|
+ });
|
|
|
+
|
|
|
+ widget.onChanged?.call(option.value);
|
|
|
+ _hideOverlay();
|
|
|
+ // 不需要在下一帧失去焦点,立即失去焦点可能会导致一些问题
|
|
|
+ // 使用post frame callback确保overlay完全隐藏后再失去焦点
|
|
|
+ WidgetsBinding.instance.addPostFrameCallback((_) {
|
|
|
+ if (mounted) {
|
|
|
+ _focusNode.unfocus();
|
|
|
+ }
|
|
|
+ });
|
|
|
+ }
|
|
|
+
|
|
|
+ void _clearSelection() {
|
|
|
+ setState(() {
|
|
|
+ _textController.clear();
|
|
|
+ _selectedValue = null;
|
|
|
+ _selectedOption = null; // 清除保存的选项
|
|
|
+ });
|
|
|
+
|
|
|
+ widget.onChanged?.call(null);
|
|
|
+ }
|
|
|
+
|
|
|
+ @override
|
|
|
+ Widget build(BuildContext context) {
|
|
|
+ return GestureDetector(
|
|
|
+ onTap: () {
|
|
|
+ // 点击时请求焦点
|
|
|
+ if (widget.enabled) {
|
|
|
+ _focusNode.requestFocus();
|
|
|
+ }
|
|
|
+ },
|
|
|
+ child: CompositedTransformTarget(
|
|
|
+ link: _layerLink,
|
|
|
+ child: TextField(
|
|
|
+ controller: _textController,
|
|
|
+ focusNode: _focusNode,
|
|
|
+ readOnly: true,
|
|
|
+ enabled: widget.enabled,
|
|
|
+ decoration: InputDecoration(
|
|
|
+ hintText: '请选择${widget.hint ?? ""}...',
|
|
|
+ suffixIcon: _selectedValue != null
|
|
|
+ ? IconButton(
|
|
|
+ icon: Icon(Icons.clear, size: 20),
|
|
|
+ onPressed: _clearSelection,
|
|
|
+ )
|
|
|
+ : Icon(Icons.arrow_drop_down),
|
|
|
+ ),
|
|
|
+ ),
|
|
|
+ ),
|
|
|
+ );
|
|
|
+ }
|
|
|
+}
|