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cascade picker
cascade_picker #
级联选择器
Usage #
1. Depend
Add this to you package's pubspec.yaml file:
dependencies:
cascade_picker: ^0.0.7
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or
cascade_picker:
git:
url: git://github.com/xionghaoo/cascade_picker.git
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2. Install
Run command:
$ flutter packages get
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3. Import
Import in Dart code:
import 'package:cascade_picker/cascade_picker.dart';
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4. Show
选择项前面的图标位置:images/ic_select_mark.png
/// CascadePicker的page是ListView,没有约束的情况下它的高度是无限的,
/// 因此需要约束高度。
///
/// final _cascadeController = CascadeController();
///
/// initialPageData: 第一页的数据
/// nextPageData: 下一页的数据,点击当前页的选择项后调用该方法加载下一页
/// - pageCallback: 用于传递下一页的数据给CascadePicker
/// - currentPage: 当前是第几页
/// - selectIndex: 当前选中第几项
/// controller: 控制器,用于获取已选择的数据
/// maxPageNum: 最大页数
/// selectedIcon(可选): 已选中选项前面的图标,flutter package不能放本地资源文件,因此需要从外部传入,
/// 图标在images文件夹下面
///
/// Expand(
/// child: CascadePicker(
/// initialPageData: ['a', 'b', 'c', 'd'],
/// nextPageData: (pageCallback, currentPage, selectIndex) async {
/// pageCallback(['one', 'two', 'three'])
/// },
/// controller: _cascadeController,
/// maxPageNum: 4,
/// selectedIcon: Image.asset("images/ic_select_mark.png", width: 10, height: 10, color: Colors.redAccent,),
/// )
///
/// InkBox(
/// child: Container(...)
/// onTap: () {
/// /// 判断是否完成选择
/// if (_cascadeController.isCompleted()) {
/// List<String> selectedTitles = _cascadeController.selectedTitles;
/// List<int> selectedIndexes = _cascadeController.selectedIndexes;
/// }
/// }
/// )
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Demo代码 #
可以直接用test_page.dart进行测试
demo使用了以下树形结构数据:
class Item {
String? name;
String? code;
String? fatherCode;
String? remark;
List<Item>? children;
}
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需要自己提取数据中要显示的标题。页数从1开始,选中项从0开始。
nextPageData: (pageCallback, currentPage, selectIndex) async {
if (currentPage == 1) {
// 在第一页选中,返回第二页列表数据
List<String>? nextPageData = items[selectIndex]
.children?.map((e) => e.name!).toList();
if (nextPageData != null) pageCallback(nextPageData);
} else if (currentPage == 2) {
// 在第二页选中,返回第三页列表数据
// 先获取已选中的序号
List<int> selectedIndexes = _cascadeController.selectedIndexes;
// 根据已选中的序号在items中获取下一级页面的列表数据
List<String>? nextPageData = items[selectedIndexes[0]]
.children?[selectIndex]
.children?.map((e) => e.name!).toList();
if (nextPageData != null) pageCallback(nextPageData);
}
},
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效果 #
1
2
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