flutter 时间选择器 年月日季度周 （在第三方基础上修改的）

在第三方flutter_picker 基础上修改了时间选择器 年月日季度周 选择器

      

datePicker.dart

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';
import 'package:semf_flutter/generated/i18n.dart';
import 'dart:async';

const bool __printDebug = false;

/// Picker selected callback.
typedef PickerSelectedCallback = void Function(
    Picker picker, int index, List<int> selecteds);

/// Picker confirm callback.
typedef PickerConfirmCallback = void Function(
    Picker picker, List<int> selecteds);

/// Picker
class Picker {
  static const double DefaultTextSize = 20.0;

  /// Index of currently selected items
  List<int> selecteds;

  /// Picker adapter, Used to provide data and generate widgets
  final PickerAdapter adapter;

  /// insert separator before picker columns
  final List<PickerDelimiter> delimiter;

  final VoidCallback onCancel;
  final PickerSelectedCallback onSelect;
  final PickerConfirmCallback onConfirm;

  /// When the previous level selection changes, scroll the child to the first item.
  final changeToFirst;

  /// Specify flex for each column
  final List<int> columnFlex;

  final Widget title;
  final Widget cancel;
  final Widget confirm;
  final String cancelText;
  final String confirmText;

  final double height;

  /// Height of list item
  final double itemExtent;

  final TextStyle textStyle,
      cancelTextStyle,
      confirmTextStyle,
      selectedTextStyle;
  final TextAlign textAlign;

  /// Text scaling factor
  final double textScaleFactor;

  final EdgeInsetsGeometry columnPadding;
  final Color backgroundColor, headercolor, containerColor;

  /// Hide head
  final bool hideHeader;

  /// Show pickers in reversed order
  final bool reversedOrder;

  /// List item loop
  final bool looping;

  /// Delay generation for smoother animation, This is the number of milliseconds to wait. It is recommended to > = 200
  final int smooth;

  final Widget footer;

  final Decoration headerDecoration;

  final double magnification;
  final double diameterRatio;
  final double squeeze;

  Widget _widget;
  PickerWidgetState _state;

  Picker(
      {this.adapter,
      this.delimiter,
      this.selecteds,
      this.height = 150.0,
      this.itemExtent = 28.0,
      this.columnPadding,
      this.textStyle,
      this.cancelTextStyle,
      this.confirmTextStyle,
      this.selectedTextStyle,
      this.textAlign = TextAlign.start,
      this.textScaleFactor,
      this.title,
      this.cancel,
      this.confirm,
      this.cancelText,
      this.confirmText,
      this.backgroundColor = Colors.white,
      this.containerColor,
      this.headercolor,
      this.changeToFirst = false,
      this.hideHeader = false,
      this.looping = false,
      this.reversedOrder = false,
      this.headerDecoration,
      this.columnFlex,
      this.footer,
      this.smooth,
      this.magnification = 1.0,
      this.diameterRatio = 1.1,
      this.squeeze = 1.45,
      this.onCancel,
      this.onSelect,
      this.onConfirm})
      : assert(adapter != null);

  Widget get widget => _widget;

  PickerWidgetState get state => _state;
  int _maxLevel = 1;

  /// 生成picker控件
  /// Build picker control
  Widget makePicker([ThemeData themeData, bool isModal = false]) {
    _maxLevel = adapter.maxLevel;
    adapter.picker = this;
    adapter.initSelects();
    _widget =
        _PickerWidget(picker: this, themeData: themeData, isModal: isModal);
    return _widget;
  }

  /// show picker
  void show(ScaffoldState state, [ThemeData themeData]) {
    state.showBottomSheet((BuildContext context) {
      return makePicker(themeData);
    });
  }

  /// 获取当前选择的值
  /// Get the value of the current selection
  List getSelectedValues() {
    return adapter.getSelectedValues();
  }

  /// 取消
  void doCancel(BuildContext context) {
    if (onCancel != null) onCancel();
    Navigator.of(context).pop<List<int>>(null);
    _widget = null;
  }

  /// 确定
  void doConfirm(BuildContext context) {
    if (onConfirm != null) onConfirm(this, selecteds);
    Navigator.of(context).pop();
    _widget = null;
  }

  /// 弹制更新指定列的内容
  /// 当 onSelect 事件中，修改了当前列前面的列的内容时，可以调用此方法来更新显示
  void updateColumn(int index, [bool all = false]) {
    if (all) {
      _state.update();
      return;
    }
    adapter.setColumn(index - 1);
    _state._keys[index].currentState.update();
  }
}

/// 分隔符
class PickerDelimiter {
  final Widget child;
  final int column;

  PickerDelimiter({this.child, this.column = 1}) : assert(child != null);
}

/// picker data list item
class PickerItem<T> {
  /// 显示内容
  final Widget text;

  /// 数据值
  final T value;

  /// 子项
  final List<PickerItem<T>> children;

  PickerItem({this.text, this.value, this.children});
}

class _PickerWidget<T> extends StatefulWidget {
  final Picker picker;
  final ThemeData themeData;
  final bool isModal;

  _PickerWidget(
      {Key key, @required this.picker, @required this.themeData, this.isModal})
      : super(key: key);

  @override
  PickerWidgetState createState() =>
      PickerWidgetState<T>(picker: this.picker, themeData: this.themeData);
}

class PickerWidgetState<T> extends State<_PickerWidget> {
  final Picker picker;
  final ThemeData themeData;

  PickerWidgetState({Key key, @required this.picker, @required this.themeData});

  ThemeData theme;
  final List<FixedExtentScrollController> scrollController = [];
  final List<GlobalKey<_StateViewState>> _keys = [];

  @override
  void initState() {
    super.initState();
    theme = themeData;
    picker._state = this;
    picker.adapter.doShow();

    if (scrollController.length == 0) {
      for (int i = 0; i < picker._maxLevel; i++) {
        scrollController
            .add(FixedExtentScrollController(initialItem: picker.selecteds[i]));
        _keys.add(GlobalKey(debugLabel: i.toString()));
      }
    }
  }

  void update() {
    setState(() {});
  }

  // var ref = 0;
  @override
  Widget build(BuildContext context) {
    // print("picker build ${ref++}");
    ScreenUtil.instance = ScreenUtil( 750, height: 1334)..init(context);
    if (_wait && picker.smooth != null && picker.smooth > 0) {
      Future.delayed(Duration(milliseconds: picker.smooth), () {
        if (!_wait) return;
        setState(() {
          _wait = false;
        });
      });
    } else
      _wait = false;

    var _body = <Widget>[];
    if (!picker.hideHeader) {
      _body.add(DecoratedBox(
        child: Row(
          children: _buildHeaderViews(),
        ),
        decoration: picker.headerDecoration ??
            BoxDecoration(
              border: Border(
                top: BorderSide(color: theme.dividerColor,  0.5),
                bottom: BorderSide(color: theme.dividerColor,  0.5),
              ),
              color: picker.headercolor == null
                  ? theme.bottomAppBarColor
                  : picker.headercolor,
            ),
      ));
    }
    _body.add(_wait
        ? Row(
            mainAxisAlignment: MainAxisAlignment.spaceBetween,
            children: _buildViews(),
          )
        : AnimatedSwitcher(
            duration: Duration(milliseconds: 300),
            child: Row(
              mainAxisAlignment: MainAxisAlignment.spaceBetween,
              children: _buildViews(),
            ),
          ));

    if (picker.footer != null) _body.add(picker.footer);
    Widget v = Column(
      mainAxisSize: MainAxisSize.min,
      children: _body,
    );
    if (widget.isModal != null && widget.isModal) {
      v = GestureDetector(
        onTap: () {},
        child: v,
      );
    }
    return v;
  }

  List<Widget> _headerItems;

  List<Widget> _buildHeaderViews() {
    if (_headerItems != null) return _headerItems;
    if (theme == null) theme = Theme.of(context);
    List<Widget> items = [];

    if (picker.cancel != null) {
      items.add(DefaultTextStyle(
          style: picker.cancelTextStyle ??
              TextStyle(
                  color: theme.accentColor, fontSize: Picker.DefaultTextSize),
          child: picker.cancel));
    } else {
      String _cancelText = picker.cancelText ?? S.of(context).datePicker_Cancel;
      if (_cancelText != null || _cancelText != "") {
        items.add(FlatButton(
            onPressed: () {
              picker.doCancel(context);
            },
            child: Text(_cancelText,
                overflow: TextOverflow.ellipsis,
                style: picker.cancelTextStyle ??
                    TextStyle(
                        color: theme.accentColor,
                        fontSize: Picker.DefaultTextSize))));
      }
    }

    items.add(Expanded(
        child: Center(
      //alignment: Alignment.center,
      child: picker.title == null
          ? picker.title
          : DefaultTextStyle(
              style: TextStyle(
                  fontSize: Picker.DefaultTextSize,
                  color: theme.textTheme.title.color),
              child: picker.title),
    )));

    if (picker.confirm != null) {
      items.add(DefaultTextStyle(
          style: picker.confirmTextStyle ??
              TextStyle(
                  color: theme.accentColor, fontSize: Picker.DefaultTextSize),
          child: picker.confirm));
    } else {
      String _confirmText =
          picker.confirmText ?? S.of(context).datePicker_Confirm;
      if (_confirmText != null || _confirmText != "") {
        items.add(FlatButton(
            onPressed: () {
              picker.doConfirm(context);
            },
            child: Text(_confirmText,
                overflow: TextOverflow.ellipsis,
                style: picker.confirmTextStyle ??
                    TextStyle(
                        color: theme.accentColor,
                        fontSize: Picker.DefaultTextSize))));
      }
    }

    _headerItems = items;
    return items;
  }

  bool _changeing = false;
  bool _wait = true;
  final Map<int, int> lastData = {};

  List<Widget> _buildViews() {
    if (__printDebug) print("_buildViews");
    if (theme == null) theme = Theme.of(context);

    List<Widget> items = [];

    PickerAdapter adapter = picker.adapter;
    if (adapter != null) adapter.setColumn(-1);

    if (adapter != null && adapter.length > 0) {
      var _decoration = BoxDecoration(
        color: picker.containerColor == null
            ? theme.dialogBackgroundColor
            : picker.containerColor,
      );

      for (int i = 0; i < picker._maxLevel; i++) {
        Widget view = Expanded(
          flex: adapter.getColumnFlex(i),
          child: Container(
            padding: picker.columnPadding,
            height: picker.height,
            decoration: _decoration,
            child: _wait
                ? null
                : _StateView(
                    key: _keys[i],
                    builder: (context) {
                      adapter.setColumn(i - 1);
                      var _length = adapter.length;
                      var _view = CupertinoPicker.builder(
                        backgroundColor: picker.backgroundColor,
                        scrollController: scrollController[i],
                        itemExtent: picker.itemExtent,
                        // looping: picker.looping,
                        magnification: picker.magnification,
                        diameterRatio: picker.diameterRatio,
                        squeeze: picker.squeeze,
                        onSelectedItemChanged: (int _index) {
                          if (__printDebug) print("onSelectedItemChanged");
                          var index = _index % _length;
                          picker.selecteds[i] = index;
                          updateScrollController(i);
                          adapter.doSelect(i, index);
                          if (picker.changeToFirst) {
                            for (int j = i + 1;
                                j < picker.selecteds.length;
                                j++) {
                              picker.selecteds[j] = 0;
                              scrollController[j].jumpTo(0.0);
                            }
                          }
                          if (picker.onSelect != null)
                            picker.onSelect(picker, i, picker.selecteds);

                          _keys[i].currentState.update();
                          if (adapter.isLinkage) {
                            for (int j = i + 1;
                                j < picker.selecteds.length;
                                j++) {
                              adapter.setColumn(j - 1);
                              _keys[j].currentState.update();
                            }
                          }
                        },
                        itemBuilder: (context, index) {
                          adapter.setColumn(i - 1);
                          return adapter.buildItem(context, index % _length);
                        },
                        childCount: picker.looping ? null : _length,
                      );

                      if (!picker.changeToFirst &&
                          picker.selecteds[i] >= _length) {
                        Timer(Duration(milliseconds: 100), () {
                          if (__printDebug) print("timer last");
                          adapter.setColumn(i - 1);
                          var _len = adapter.length;
                          scrollController[i].jumpToItem(
                              (_len < _length ? _len : _length) - 1);
                        });
                      }

                      return _view;
                    },
                  ),
          ),
        );
        items.add(view);
      }
    }

    if (picker.delimiter != null && !_wait) {
      for (int i = 0; i < picker.delimiter.length; i++) {
        var o = picker.delimiter[i];
        if (o.child == null) continue;
        var item = Container(child: o.child, height: picker.height);
        if (o.column < 0)
          items.insert(0, item);
        else if (o.column >= items.length)
          items.add(item);
        else
          items.insert(o.column, item);
      }
    }

    if (picker.reversedOrder) return items.reversed.toList();

    return items;
  }

  void updateScrollController(int i) {
    if (_changeing || !picker.adapter.isLinkage) return;
    _changeing = true;
    for (int j = 0; j < picker.selecteds.length; j++) {
      if (j != i) {
        if (scrollController[j].position.maxScrollExtent == null) continue;
        scrollController[j].position.notifyListeners();
      }
    }
    _changeing = false;
  }
}

/// 选择器数据适配器
abstract class PickerAdapter<T> {
  Picker picker;

  int getLength();

  int getMaxLevel();

  void setColumn(int index);

  void initSelects();

  Widget buildItem(BuildContext context, int index);

  Widget makeText(Widget child, String text, bool isSel) {
    return new Center(
        //alignment: Alignment.center,
        child: DefaultTextStyle(
            overflow: TextOverflow.ellipsis,
            maxLines: 1,
            textAlign: picker.textAlign,
            style: picker.textStyle ??
                TextStyle(
                    color: Colors.black87, fontSize: Picker.DefaultTextSize),
            child: child != null
                ? child
                : Text(text,
                    textScaleFactor: picker.textScaleFactor,
                    style: (isSel ? picker.selectedTextStyle : null))));
  }

  Widget makeTextEx(
      Widget child, String text, Widget postfix, Widget suffix, bool isSel) {
    List<Widget> items = [];
    if (postfix != null) items.add(postfix);
    items.add(
        child ?? Text(text, style: (isSel ? picker.selectedTextStyle : null)));
    if (suffix != null) items.add(suffix);

    var _txtColor = Colors.black87;
    var _txtSize = Picker.DefaultTextSize;
    if (isSel && picker.selectedTextStyle != null) {
      if (picker.selectedTextStyle.color != null)
        _txtColor = picker.selectedTextStyle.color;
      if (picker.selectedTextStyle.fontSize != null)
        _txtSize = picker.selectedTextStyle.fontSize;
    }

    return new Center(
        //alignment: Alignment.center,
        child: DefaultTextStyle(
            overflow: TextOverflow.ellipsis,
            maxLines: 1,
            textAlign: picker.textAlign,
            style: picker.textStyle ??
                TextStyle(color: _txtColor, fontSize: _txtSize),
            child: Wrap(
              children: items,
            )));
  }

  String getText() {
    return getSelectedValues().toString();
  }

  List<T> getSelectedValues() {
    return [];
  }

  void doShow() {}

  void doSelect(int column, int index) {}

  int getColumnFlex(int column) {
    if (picker.columnFlex != null && column < picker.columnFlex.length)
      return picker.columnFlex[column];
    return 1;
  }

  int get maxLevel => getMaxLevel();

  /// Content length of current column
  int get length => getLength();

  String get text => getText();

  // 是否联动，即后面的列受前面列数据影响
  bool get isLinkage => getIsLinkage();

  @override
  String toString() {
    return getText();
  }

  bool getIsLinkage() {
    return true;
  }

  /// 通知适配器数据改变
  void notifyDataChanged() {
    if (picker != null && picker.state != null) {
      picker.adapter.doShow();
      picker.adapter.initSelects();
      for (int j = 0; j < picker.selecteds.length; j++)
        picker.state.scrollController[j].jumpToItem(picker.selecteds[j]);
    }
  }
}

/// Picker DateTime Adapter Type
class PickerDateTimeType {
  static const int kMDY = 0; // m, d, y
  static const int kHM = 1; // hh, mm
  static const int kHMS = 2; // hh, mm, ss
  static const int kHM_AP = 3; // hh, mm, ap(AM/PM)
  static const int kMDYHM = 4; // m, d, y, hh, mm
  static const int kMDYHM_AP = 5; // m, d, y, hh, mm, AM/PM
  static const int kMDYHMS = 6; // m, d, y, hh, mm, ss

  static const int kYMD = 7; // y, m, d
  static const int kYMDHM = 8; // y, m, d, hh, mm
  static const int kYMDHMS = 9; // y, m, d, hh, mm, ss
  static const int kYMD_AP_HM = 10; // y, m, d, ap, hh, mm

  static const int kYM = 11; // y, m
  static const int kDMY = 12; // d, m, y
  static const int kY = 13; // y
  static const int kYQ = 14; //y,Q
  static const int kYMWD = 15; //y,m,w,d
}

class DateTimePickerAdapter extends PickerAdapter<DateTime> {
  /// display type, ref: columnType
  final int type;

  /// Whether to display the month in numerical form.If true, months is not used.
  final bool isNumberMonth;

  /// custom months strings
  final List<String> months;

  /// Custom AM, PM strings
  final List<String> strAMPM;

  /// year begin...end.
  final int yearBegin, yearEnd;

  /// minimum datetime
  final DateTime minValue, maxValue;

  /// jump minutes, user could select time in intervals of 30min, 5mins, etc....
  final int minuteInterval;

  /// Year, month, day suffix
  final String yearSuffix, monthSuffix, daySuffix, quarterSuffix, weekSuffix;

  /// use two-digit year, 2019, displayed as 19
  final bool twoDigitYear;

  /// year 0, month 1, day 2, hour 3, minute 4, sec 5, am/pm 6, hour-ap: 7
  final List<int> customColumnType;

  static const List<String> MonthsList_EN = const [
    "Jan",
    "Feb",
    "Mar",
    "Apr",
    "May",
    "Jun",
    "Jul",
    "Aug",
    "Sep",
    "Oct",
    "Nov",
    "Dec"
  ];

  static const List<String> MonthsList_EN_L = const [
    "January",
    "February",
    "March",
    "April",
    "May",
    "June",
    "July",
    "August",
    "September",
    "October",
    "November",
    "December"
  ];

  DateTimePickerAdapter({
    Picker picker,
    this.type = 0,
    this.isNumberMonth = false,
    this.months = MonthsList_EN,
    this.strAMPM,
    this.yearBegin = 1900,
    this.yearEnd = 2100,
    this.value,
    this.minValue,
    this.maxValue,
    this.yearSuffix,
    this.monthSuffix,
    this.daySuffix,
    this.quarterSuffix,
    this.weekSuffix,
    this.minuteInterval,
    this.customColumnType,
    this.twoDigitYear = false,
  }) : assert(minuteInterval == null ||
            (minuteInterval >= 1 &&
                minuteInterval <= 30 &&
                (60 % minuteInterval == 0))) {
    super.picker = picker;
    _yearBegin = yearBegin;
    if (minValue != null && minValue.year > _yearBegin) {
      _yearBegin = minValue.year;
    }
  }

  int _col = 0;
  int _colAP = -1;
  int _yearBegin = 0;

  /// Currently selected value
  DateTime value;

  // but it can improve the performance, so keep it.
  static const List<List<int>> lengths = const [
    [12, 31, 0],
    [24, 60],
    [24, 60, 60],
    [12, 60, 2],
    [12, 31, 0, 24, 60],
    [12, 31, 0, 12, 60, 2],
    [12, 31, 0, 24, 60, 60],
    [0, 12, 31],
    [0, 12, 31, 24, 60],
    [0, 12, 31, 24, 60, 60],
    [0, 12, 31, 2, 12, 60],
    [0, 12],
    [31, 12, 0],
    [0],
    [0, 4],
    [0, 12, 52, 31],
  ];

  static const Map<int, int> columnTypeLength = {
    0: 0,
    1: 12,
    2: 31,
    3: 24,
    4: 60,
    5: 60,
    6: 2,
    7: 12,
    8: 4,
    9: 52,
  };

  /// year 0, month 1, day 2, hour 3, minute 4, sec 5, am/pm 6, hour-ap: 7
  static const List<List<int>> columnType = const [
    [1, 2, 0],
    [3, 4],
    [3, 4, 5],
    [7, 4, 6],
    [1, 2, 0, 3, 4],
    [1, 2, 0, 7, 4, 6],
    [1, 2, 0, 3, 4, 5],
    [0, 1, 2],
    [0, 1, 2, 3, 4],
    [0, 1, 2, 3, 4, 5],
    [0, 1, 2, 6, 7, 4],
    [0, 1],
    [2, 1, 0],
    [0],
    [0, 8],
    [0, 1, 9, 2],
  ];

  // static const List<int> leapYearMonths = const <int>[1, 3, 5, 7, 8, 10, 12];

  // 获取当前列的类型
  int getColumnType(int index) {
    if (customColumnType != null) return customColumnType[index];
    List<int> items = columnType[type];
    if (index >= items.length) return -1;
    return items[index];
  }

  @override
  int getLength() {
    int v = customColumnType == null
        ? lengths[type][_col]
        : columnTypeLength[customColumnType[_col]];
    if (v == 0) {
      //年
      int ye = yearEnd;
      if (maxValue != null) ye = maxValue.year;
      return ye - _yearBegin + 1;
    }
    //日
    if (v == 31) return _calcDateCount(value.year, value.month);

    if (minuteInterval != null && minuteInterval > 1) {
      int _type = getColumnType(_col);
      if (_type == 4) {
        return v ~/ minuteInterval;
      }
    }
    //周,如果当年的12月31是周四，则当年有53周 （国际规定是周四为一周的第一天）
    if (v == 52) {
      DateTime date = DateTime.utc(value.year, 12, 31);
      if (date.weekday == DateTime.thursday) {
        return 53;
      }
    }

    return v;
  }

  @override
  int getMaxLevel() {
    return customColumnType == null
        ? lengths[type].length
        : customColumnType.length;
  }

  @override
  void setColumn(int index) {
    //print("setColumn index: $index");
    _col = index + 1;
    if (_col < 0) _col = 0;
  }

  @override
  void initSelects() {
    if (value == null) value = DateTime.now();
    _colAP = _getAPColIndex();
    int _maxLevel = getMaxLevel();
    if (picker.selecteds == null || picker.selecteds.length == 0) {
      if (picker.selecteds == null) picker.selecteds = List<int>();
      for (int i = 0; i < _maxLevel; i++) picker.selecteds.add(0);
    }
  }

  @override
  Widget buildItem(BuildContext context, int index) {
    String _text = "";
    int colType = getColumnType(_col);
    switch (colType) {
      case 0:
        if (twoDigitYear != null && twoDigitYear) {
          _text = "${_yearBegin + index}";
          var _l = _text.length;
          _text =
              "${_text.substring(_l - (_l - 2), _l)}${_checkStr(yearSuffix)}";
        } else
          _text = "${_yearBegin + index}${_checkStr(yearSuffix)}";
        break;
      case 1:
        if (isNumberMonth) {
          _text = "${intToStr(index + 1)}${_checkStr(monthSuffix)}";
        } else {
          if (months != null)
            _text = "${intToStr(int.parse(months[index]))}";
          else {
//            List _months =
//                PickerLocalizations
//                    .of(context)
//                    .months ?? MonthsList_EN;
            List _months = MonthsList_EN;
            _text = "${intToStr(_months[index])}";
          }
        }
        break;
      case 2:
        _text = "${intToStr(index + 1)}${_checkStr(daySuffix)}";
        break;
      case 3:
      case 5:
        _text = "${intToStr(index)}";
        break;
      case 4:
        if (minuteInterval == null || minuteInterval < 2)
          _text = "${intToStr(index)}";
        else
          _text = "${intToStr(index * minuteInterval)}";
        break;
      case 6:
//        List _ampm = strAMPM ?? PickerLocalizations
//            .of(context)
//            .ampm;
        List _ampm = strAMPM;
        if (_ampm == null) _ampm = const ['AM', 'PM'];
        _text = "${_ampm[index]}";
        break;
      case 7:
        _text = "${intToStr(index + 1)}";
        break;
      case 8:
        _text = "${_checkStr(quarterSuffix)}${index + 1}";
        break;
      case 9:
        _text = "${index + 1}${_checkStr(weekSuffix)}";
        break;
    }

    return makeText(null, _text, picker.selecteds[_col] == index);
  }

  @override
  String getText() {
    return value.toString();
  }

  @override
  int getColumnFlex(int column) {
    if (picker.columnFlex != null && column < picker.columnFlex.length)
      return picker.columnFlex[column];
    if (getColumnType(column) == 0) return 3;
    return 2;
  }

  @override
  void doShow() {
    if (_yearBegin == 0) getLength();
    var _maxLevel = getMaxLevel();
    for (int i = 0; i < _maxLevel; i++) {
      int colType = getColumnType(i);
      switch (colType) {
        case 0:
          picker.selecteds[i] = value.year - _yearBegin;
          break;
        case 1:
          picker.selecteds[i] = value.month - 1;
          break;
        case 2:
          picker.selecteds[i] = value.day - 1;
          break;
        case 3:
          picker.selecteds[i] = value.hour;
          break;
        case 4:
          picker.selecteds[i] = minuteInterval == null || minuteInterval < 2
              ? value.minute
              : value.minute ~/ minuteInterval;
          break;
        case 5:
          picker.selecteds[i] = value.second;
          break;
        case 6:
          picker.selecteds[i] = (value.hour > 12 || value.hour == 0) ? 1 : 0;
          break;
        case 7:
          picker.selecteds[i] = value.hour == 0
              ? 11
              : (value.hour > 12) ? value.hour - 12 - 1 : value.hour - 1;
          break;
        case 8:
          int quarter = getQuarter();
          picker.selecteds[i] = quarter - 1;
          break;
        case 9:
          int week = getWeek();
          picker.selecteds[i] = week - 1;
          break;
      }
    }
  }

  ///国际规定是周四为一周的第一天
  static const int EPOCH_WEEK_DAY = DateTime.thursday;
  static const int EPOCH_JULIAN_DAY = 0;

  int getWeek() {
    ///当前选中时间 周几
    var currentWeekDay = value.weekday;

    ///周四
    int EPOCH_WEEK_DAY = DateTime.thursday;

    DateTime epoch = DateTime.utc(value.year);

    int offset = EPOCH_WEEK_DAY - currentWeekDay;

    int delta = EPOCH_JULIAN_DAY - offset;

    int week = (value.difference(epoch).inDays - delta) ~/ 7 + 1;
    return week;
  }

  ///获取季度
  int getQuarter() {
    if (value.month >= 1 && value.month <= 3) {
      return 1;
    } else if (value.month >= 4 && value.month <= 6) {
      return 2;
    } else if (value.month >= 7 && value.month <= 9) {
      return 3;
    } else if (value.month >= 10 && value.month <= 12) {
      return 4;
    } else {
      return 0;
    }
  }

  @override
  void doSelect(int column, int index) {
    int year, month, day, h, m, s, q, w;
    year = value.year;
    month = value.month;
    day = value.day;
    h = value.hour;
    m = value.minute;
    s = value.second;
    q = getQuarter();
    w = getWeek();
    if (type != 2 && type != 6) s = 0;
    int colType = getColumnType(column);
    switch (colType) {
      case 0:
        year = _yearBegin + index;
        break;
      case 1:
        month = index + 1;
        break;
      case 2:
        day = index + 1;
        break;
      case 3:
        h = index;
        break;
      case 4:
        m = (minuteInterval == null || minuteInterval < 2)
            ? index
            : index * minuteInterval;
        break;
      case 5:
        s = index;
        break;
      case 6:
        if (picker.selecteds[_colAP] == 0) {
          if (h == 0) h = 12;
          if (h > 12) h = h - 12;
        } else {
          if (h < 12) h = h + 12;
          if (h == 12) h = 0;
        }
        break;
      case 7:
        h = index + 1;
        if (_colAP >= 0 && picker.selecteds[_colAP] == 1) h = h + 12;
        if (h > 23) h = 0;
        break;
      case 8:
        q = index + 1;
        if (q == 1) {
          month = 1;
        } else if (q == 2) {
          month = 4;
        } else if (q == 3) {
          month = 7;
        } else if (q == 4) {
          month = 10;
        }
        break;
      case 9:
        w = index + 1;
        break;
    }
    int __day = _calcDateCount(year, month);
    if (day > __day) day = __day;
    value = DateTime(year, month, day, h, m, s);

    if (minValue != null &&
        (value.millisecondsSinceEpoch < minValue.millisecondsSinceEpoch)) {
      value = minValue;
      notifyDataChanged();
    } else if (maxValue != null &&
        value.millisecondsSinceEpoch > maxValue.millisecondsSinceEpoch) {
      value = maxValue;
      notifyDataChanged();
    }

    ///年月周日类型，年或月或日改变的时候改动日期所在周也随之改变
    if (type == 15) {
      int selectWeek = getWeek();
      w = selectWeek - 1;
      notifyDataChanged();
    }
  }

  int _getAPColIndex() {
    List<int> items = customColumnType ?? columnType[type];
    for (int i = 0; i < items.length; i++) {
      if (items[i] == 6) return i;
    }
    return -1;
  }

  int _calcDateCount(int year, int month) {
    switch (month) {
      case 1:
      case 3:
      case 5:
      case 7:
      case 8:
      case 10:
      case 12:
        return 31;
      case 2:
        {
          if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0) {
            return 29;
          }
          return 28;
        }
    }
    return 30;
  }

  String intToStr(int v) {
    return (v < 10) ? "0$v" : "$v";
  }

  String _checkStr(String v) {
    return v == null ? "" : v;
  }
}

class _StateView extends StatefulWidget {
  final WidgetBuilder builder;

  const _StateView({Key key, this.builder}) : super(key: key);

  @override
  State<StatefulWidget> createState() => _StateViewState();
}

class _StateViewState extends State<_StateView> {
  @override
  Widget build(BuildContext context) {
    return widget.builder(context);
  }

  update() {
    setState(() {});
  }
}

使用方法：

DateTime showPickerDate = DateTime.now();
 int type;
  　　switch (timeFormat) {
        case 'yyyyMMdd':
          showPickerDate = DateTime.parse(dateParam);
          type = PickerDateTimeType.kYMD;
          break;
        case 'yyyyMM':
          type = PickerDateTimeType.kYM;
          showPickerDate = DateTime.parse(dateParam + '01');
          break;
        case 'yyyy':
          type = PickerDateTimeType.kY;
          showPickerDate = DateTime.parse(dateParam + '0101');
          break;
        case 'yyyyQM':
          type = PickerDateTimeType.kYQ;
          //季度转时间月份DateTime
          List quDateList = dateParam.split('Q');
          showPickerDate = DateTime.parse(
              quDateList[0] + getMonthWithQuarter(quDateList[1]) + '01');
          break;
        case 'yyyyWEEK':
          type = PickerDateTimeType.kYMWD;
          showPickerDate = DateTime.now();
          break;
      }

    new Picker(
        height: 250,
        adapter: new DateTimePickerAdapter(
          type: type,
          isNumberMonth: true,
          yearSuffix: "年",
          monthSuffix: "月",
          daySuffix: "日",
          quarterSuffix: "Q",
          weekSuffix: '周',
          value: showPickerDate,
        ),
        title: new Text(S.of(context).datePicker_Title),
        onConfirm: (Picker picker, List value) {
          print(picker.adapter.text);
        },
        onSelect: (Picker picker, int index, List<int> selecteds) {
          this.setState(() {
            stateText = picker.adapter.toString();
            print(stateText);
          });
        }).show(Scaffold.of(context));

//根据季度获取时间月份

String getMonthWithQuarter(String quarterString) {
  if (quarterString == '1') {
    return '01';
  } else if (quarterString == '2') {
    return '04';
  } else if (quarterString == '3') {
    return '07';
  } else if (quarterString == '4') {
    return '10';
  } else {
    return "";
  }
}