app-zj/lib/ext/value_notifier_ext.dart

import 'package:flutter/material.dart';

/// 万物皆可Notifier
extension ObjectNotifierExt on Object? {
  ValueNotifier<T> notifier<T>() => ValueNotifier(this as T);
}

/// 拓展ValueNotifier
/// 快捷调用builder来编写组件
extension NotifierObjectExt<T> on ValueNotifier<T> {
  /// 创建Builder
  ValueListenableBuilder<T> builder(Widget Function(T v) build) {
    return ValueListenableBuilder<T>(
      valueListenable: this,
      builder: (context, v, child) => build.call(v),
    );
  }

  /// ==
  bool equals(T other) => value == other;

  /// 刷新数据
  update(T other) => value = other;
}

/// num相关拓展
extension NotifierNumExt on ValueNotifier<num> {
  ValueListenableBuilder<num> builder(Widget Function(num v) build) {
    return ValueListenableBuilder(
      valueListenable: this,
      builder: (context, v, child) => build.call(v),
    );
  }

  num operator +(num other) => value += other;

  num operator -(num other) => value -= other;

  num operator *(num other) => value *= other;

  double operator /(num other) => value = value / other;

  int operator ~/(num other) => value = value ~/ other;

  num operator -() => -value;

  /// 取模
  num operator %(num other) => value % other;

  /// 取余
  num remainder(num other) => value.remainder(other);

  /// 是否相等
  bool equals(num other) => value == other;

  bool operator <(num other) => value < other;

  bool operator <=(num other) => value <= other;

  bool operator >(num other) => value > other;

  bool operator >=(num other) => value >= other;

  /// 赋值 通知更新
  update(num other) => value = other;
}