import 'package:flutter/widgets.dart';

/// 表格列配置
class TableColumn<T> {
  TableColumn({
    this.headerText,
    this.headerRender,
    this.textFormatter,
    this.render,
    this.textAlign = TextAlign.center,
    this.flex = 1,
    this.width,
    this.minWidth,
    this.maxWidth,
    this.textFontSize = 15,
  })  : assert(() {
          if (headerText == null && headerRender == null) {
            throw FlutterError(
                "`titleText` and `headerRender` cannot both be null.");
          }
          return true;
        }()),
        assert(() {
          if (textFormatter == null && render == null) {
            throw FlutterError(
                "`textFormatter` and `render` cannot both be null.");
          }
          return true;
        }());

  /// 列头文本
  final String? headerText;

  /// 列头自定义渲染
  final Widget Function()? headerRender;

  /// 内容文本格式器
  final String Function(T rowData, int rowIndex)? textFormatter;

  /// 内容自定义渲染
  final Widget Function(T rowData, int rowIndex)? render;

  /// 内容文本对齐方式
  final TextAlign textAlign;

  /// 列宽自适应权重
  final int flex;

  /// 固定栏宽 -尚未启用
  final double? width;

  /// 最小列宽 -尚未启用
  final double? minWidth;

  /// 最大列宽 -尚未启用
  final double? maxWidth;

  /// 在内容文本格式器的时候改变文字大小
  final double? textFontSize;

  int get actualFlex => width != null || maxWidth != null ? 0 : flex;

  bool get hasWidthLimit =>
      width != null || maxWidth != null || minWidth != null;
}