本文用于记录分析Imge图片加载流程源码分析学习笔记

切入点是Image.network，加载网络图片

构造方法会创建NetworkImage，加载图片的实现类，父类是ImageProvider

加载本地图片等等都是类似

下面进入_ImageState类

void resolveStreamForKey(ImageConfiguration configuration, ImageStream stream, T key, ImageErrorListener handleError) {
  // This is an unusual edge case where someone has told us that they found
  // the image we want before getting to this method. We should avoid calling
  // load again, but still update the image cache with LRU information.
//图片正在加载就直接返回，等待图片加载完成之后刷新页面
  if (stream.completer != null) {
    final Imag