app-starlock/lib/tools/pickers/style/picker_style.dart

import 'package:flutter/material.dart';

/// 基础样式
/// [showTitleBar] 是否显示头部（选择器以上的控件） 默认：true
/// [menu] 头部和选择器之间的菜单widget,默认null 不显示
/// [title] 头部 中间的标题  默认SizedBox() 不显示
/// [pickerHeight] 选择器下面 picker 的整体高度  固定高度：220.0
/// [pickerTitleHeight]  选择器上面 title 确认、取消的整体高度  固定高度：44.0
/// [pickerItemHeight]  选择器每个被选中item的高度：40.0
/// [menuHeight]  头部和选择器之间的菜单高度  固定高度：36.0
/// [cancelButton]  头部的取消按钮
/// [commitButton]  头部的确认按钮
/// [textColor]  选择器的文字颜色 默认黑色
/// [textSize]  选择器的文字大小
/// [backgroundColor]  选择器的背景颜色 默认白色
/// [headDecoration] 头部Container 的Decoration   默认：BoxDecoration(color: Colors.white)
///
class PickerStyle {
  BuildContext? _context;

  bool? _showTitleBar;
  Widget? _menu;
  double? _pickerHeight;
  double? _pickerTitleHeight;
  double? _pickerItemHeight;
  double? _menuHeight;

  Widget? _cancelButton;
  Widget? _commitButton;
  Widget? _title;
  Decoration? _headDecoration;
  Color? _backgroundColor;
  Color? _textColor;
  double? _textSize;
  Widget? _itemOverlay;

  PickerStyle({
    BuildContext? context,
    bool? showTitleBar,
    Widget? menu,
    double? pickerHeight,
    double? pickerTitleHeight,
    double? pickerItemHeight,
    double? menuHeight,
    Widget? cancelButton,
    Widget? commitButton,
    Widget? title,
    Decoration? headDecoration,
    Color? backgroundColor,
    Color? textColor,
    double? textSize,
    Widget? itemOverlay,
  }) {
    this._context = context;
    this._showTitleBar = showTitleBar;
    this._menu = menu;

    this._pickerHeight = pickerHeight;
    this._pickerTitleHeight = pickerTitleHeight;
    this._pickerItemHeight = pickerItemHeight;
    this._menuHeight = menuHeight;

    this._cancelButton = cancelButton;
    this._commitButton = commitButton;
    this._title = title;
    this._headDecoration = headDecoration;
    this._backgroundColor = backgroundColor;
    this._textColor = textColor;
    this._textSize = textSize;
    this._itemOverlay = itemOverlay;
  }

  set context(BuildContext? value) {
    _context = value;
  }

  set menuHeight(double value) {
    _menuHeight = value;
  }

  set menu(Widget? value) {
    _menu = value;
  }

  set pickerHeight(double value) {
    _pickerHeight = value;
  }

  set pickerTitleHeight(double value) {
    _pickerTitleHeight = value;
  }

  set pickerItemHeight(double value) {
    _pickerItemHeight = value;
  }

  set cancelButton(Widget value) {
    _cancelButton = value;
  }

  set commitButton(Widget value) {
    _commitButton = value;
  }

  set itemOverlay(Widget? value) {
    _itemOverlay = value;
  }

  set title(Widget value) {
    _title = value;
  }

  set headDecoration(Decoration value) {
    _headDecoration = value;
  }

  set backgroundColor(Color value) {
    _backgroundColor = value;
  }

  set textColor(Color value) {
    _textColor = value;
  }

  set textSize(double? value) {
    _textSize = value;
  }

  set showTitleBar(bool value) {
    _showTitleBar = value;
  }

  BuildContext? get context => this._context;

  /// 选择器背景色 默认白色
  Color get backgroundColor => this._backgroundColor ?? Colors.white;

  Decoration get headDecoration =>
      this._headDecoration ?? BoxDecoration(color: Colors.white);

  Widget? get menu => this._menu;

  double get menuHeight => this._menuHeight ?? 36.0;

  double get pickerHeight => this._pickerHeight ?? 220.0;

  double get pickerItemHeight => this._pickerItemHeight ?? 40.0;

  double get pickerTitleHeight => this._pickerTitleHeight ?? 44.0;

  bool get showTitleBar => this._showTitleBar ?? true;

  Color get textColor => this._textColor ?? Colors.black87;

  double? get textSize => this._textSize;

  Widget get title => this._title ?? SizedBox();

  Widget get commitButton => getCommitButton();

  Widget get cancelButton => getCancelButton();

  Widget? get itemOverlay => this._itemOverlay;

  Widget getCommitButton() {
    return this._commitButton ??
        Container(
          alignment: Alignment.center,
          padding: const EdgeInsets.only(left: 12, right: 22),
          child: const Text('确定',
              style: TextStyle(color: Colors.blue, fontSize: 16.0)),
        );
  }

  Widget getCancelButton() {
    return this._cancelButton ??
        Container(
          alignment: Alignment.center,
          padding: const EdgeInsets.only(left: 22, right: 12),
          child: Text('取消',
              style: TextStyle(
                  color: Theme.of(context!).unselectedWidgetColor,
                  fontSize: 16.0)),
        );
  }
}