fis_lib_vid/lib/image_fetcher/base.dart

import 'package:fis_common/logger/logger.dart';
import 'package:flutter/foundation.dart';
import 'package:vid/us/vid_us_image.dart';

/// Vid图像获取
abstract class VidImageFetcherBase {
  late final String _url;

  /// 图像缓存（未释放时保持）
  @protected
  VidUsImage? cache;

  VidImageFetcherBase(String url) {
    _url = url;
  }

  /// vid链接
  String get url => _url;

  /// 获取图像
  Future<VidUsImage?> fetch() async {
    try {
      cache ??= await innerFetch();
      return cache!;
    } catch (e) {
      logger.e('VidImageFetcherBase - fetch vid image fail', e);
    }
    return null;
  }

  @protected
  Future<VidUsImage?> innerFetch();

  /// 释放资源
  void dispose();
}