show static method

void show(BuildContext context, { String? title, List<int>? defaultValue, String? cancelText, String? confirmText, Widget? titleWidget, Color? headerBackgroundColor, Color? backgroundColor, Color? cancelTextColor, Color? confirmTextColor, BorderRadiusGeometry? borderRadius, bool isDefaultShowToday = true, List<int>? minDate, List<int>? maxDate, List<BetterDatePickerColumnType>? columnTypes = const [BetterDatePickerColumnType.year, BetterDatePickerColumnType.month, BetterDatePickerColumnType.day], dynamic formatter(BetterDatePickerFormatterOption)?, dynamic filter(BetterDatePickerFilterOption)?, VoidCallback? onCancel, dynamic onConfirm(List<BetterPickerItem>)?, dynamic onChange(List<BetterPickerItem>)?, VoidCallback? onClose, double? diameterRatio, double? itemHeight, Widget? overlayWidget, })

Implementation

static void show(
  BuildContext context, {
  //标题
  String? title,

  List<int>? defaultValue,

  /// 取消按钮的文本
  String? cancelText,

  /// 确认按钮的文本
  String? confirmText,

  /// 选择器的标题组件
  Widget? titleWidget,

  /// 头部背景颜色
  Color? headerBackgroundColor,

  /// 选择器的背景颜色
  Color? backgroundColor,

  /// 取消按钮的文本颜色
  Color? cancelTextColor,

  /// 确认按钮的文本颜色
  Color? confirmTextColor,

  /// 选择器的圆角半径
  BorderRadiusGeometry? borderRadius,
  //是否默认显示当天时间
  bool isDefaultShowToday = true,
  List<int>? minDate,
  List<int>? maxDate,
  List<BetterDatePickerColumnType>? columnTypes = const [
    BetterDatePickerColumnType.year,
    BetterDatePickerColumnType.month,
    BetterDatePickerColumnType.day,
  ],

  /// 格式化选项
  Function(BetterDatePickerFormatterOption)? formatter,
  //过滤选项
  Function(BetterDatePickerFilterOption)? filter,

  /// 取消回调
  VoidCallback? onCancel,

  /// 确认回调
  Function(List<BetterPickerItem>)? onConfirm,

  /// 改变回调
  Function(List<BetterPickerItem>)? onChange,

  /// 关闭回调
  VoidCallback? onClose,

  /// 选择器的直径比例
  double? diameterRatio,

  /// 选择器的高度
  double? itemHeight,

  /// 选择器的覆盖组件
  Widget? overlayWidget,
}) {
  DateTime now = DateTime.now();
  //最小日期
  int minYear = now.year - 5;
  int minMonth = 1;
  int minDay = 1;
  int maxYear = now.year + 5;
  int maxMonth = 12;
  int maxDay = _getDaysInMonth(maxYear, maxMonth);

  if (minDate != null) {
    if (minDate.length < 3) {
      throw Exception("minDate length must be 3");
    }
    minYear = minDate[0];
    minMonth = minDate[1];
    //避免超过该月最大天数
    int d = _getDaysInMonth(minYear, minMonth);
    minDay = minDate[2] > d ? d : minDate[2];
  }
  if (maxDate != null) {
    if (maxDate.length < 3) {
      throw Exception("maxDate length must be 3");
    }
    maxYear = maxDate[0];
    maxMonth = maxDate[1];
    //避免超过该月最大天数
    int d = _getDaysInMonth(maxYear, maxMonth);
    maxDay = maxDate[2] > d ? d : maxDate[2];
  }

  // 存储当前选中的值
  int currentYear;
  int currentMonth;
  int currentDay;

  //获取年份的列在columns的下标
  int yearColumnIndex = columnTypes!.indexWhere(
    (element) => element == BetterDatePickerColumnType.year,
  );
  int monthColumnIndex = columnTypes.indexWhere(
    (element) => element == BetterDatePickerColumnType.month,
  );
  int dayColumnIndex = columnTypes.indexWhere(
    (element) => element == BetterDatePickerColumnType.day,
  );

  //如果不需要默认显示当天时间，则设置为最小年月日
  if (!isDefaultShowToday) {
    currentYear = minYear;
    currentMonth = 1;
    currentDay = 1;
  } else {
    currentYear = now.year;
    currentMonth = now.month;
    currentDay = now.day;
  }

  //有默认值
  if (defaultValue != null) {
    if (defaultValue.length < 3) {
      throw Exception("defaultValue length must be 3");
    }
    if (yearColumnIndex != -1) {
      currentYear = defaultValue[yearColumnIndex];
    }
    if (monthColumnIndex != -1) {
      currentMonth = defaultValue[monthColumnIndex];
    }
    if (dayColumnIndex != -1) {
      currentDay = defaultValue[dayColumnIndex];
    }
  }

  // 列数据
  List<List<BetterPickerItem>> columns = [];
  //年
  if (columnTypes.contains(BetterDatePickerColumnType.year)) {
    columns.add(
      _generateItems(
        minYear,
        maxYear,
        currentYear,
        BetterDatePickerColumnType.year,
        formatter,
        filter,
      ),
    );
  }
  //月份
  if (columnTypes.contains(BetterDatePickerColumnType.month)) {
    columns.add(
      _generateItems(
        1,
        12,
        currentMonth,
        BetterDatePickerColumnType.month,
        formatter,
        filter,
      ),
    );
  }

  if (columnTypes.contains(BetterDatePickerColumnType.day)) {
    columns.add(
      _generateDayItems(minDay, maxDay, currentDay, formatter, filter),
    );
  }

  BetterPicker.show(
    context,
    title: title,
    cancelText: cancelText,
    confirmText: confirmText,
    titleWidget: titleWidget,
    headerBackgroundColor: headerBackgroundColor,
    backgroundColor: backgroundColor,
    borderRadius: borderRadius,
    cancelTextColor: cancelTextColor,
    confirmTextColor: confirmTextColor,
    onCancel: onCancel,
    onConfirm: onConfirm,
    onClose: onClose,
    diameterRatio: diameterRatio,
    itemHeight: itemHeight,
    overlayWidget: overlayWidget,
    onChange:
        (
          List<BetterPickerItem> selectedValues,
          Function(dynamic columns) updateColumns,
        ) {
          //有显示天数的才需要判断更新
          if (columnTypes.contains(BetterDatePickerColumnType.day)) {
            // 检查年份或月份是否发生变化
            //获取年份的列在columns的下标
            int newYear = currentYear;
            if (yearColumnIndex != -1) {
              newYear = int.parse(selectedValues[yearColumnIndex].value);
            }
            int newMonth = currentMonth;
            if (monthColumnIndex != -1) {
              newMonth = int.parse(selectedValues[monthColumnIndex].value);
            }
            // 如果年份或月份发生变化，判断是否需要更新天数
            if (newYear != currentYear || newMonth != currentMonth) {
              currentYear = newYear;
              currentMonth = newMonth;
              int newMaxDay = _getDaysInMonth(currentYear, currentMonth);
              //天数最大值发生变化再改变
              if (newMaxDay != maxDay) {
                maxDay = newMaxDay;
                // 获取当前选中的天数
                int selectedDay = int.parse(
                  selectedValues[dayColumnIndex].value,
                );
                // 重新生成天数列表
                columns[dayColumnIndex] = _generateDayItems(
                  minDay,
                  maxDay,
                  selectedDay,
                  formatter,
                  filter,
                );

                // 更新当前天数
                currentDay = selectedDay > maxDay ? maxDay : selectedDay;
                updateColumns(columns);
              }
            }
          }
          onChange?.call(selectedValues);
        },
    columns: columns,
  );
}