dart - 如何使用 Pageable 惰性列表

Question

我想创建一个很长的小部件列表，用户可能想要滚动浏览，比如一本书。我注意到 PageableLazyList 类，但不太明白我应该如何使用它。

class NotePage extends PageableLazyList {

  NotePage({Key key, this.note}) : super(key: key,itemBuilder: itembuilder); 
  final Note note;

  static List<NoteContainer> itembuilder (BuildContext context, num start, num count ){
    List<NoteContainer> result = <NoteContainer>[];
    for(num i = start; i < start+count; i++){
      result.add(new NoteContainer(new Note(title: "Note " + i.toString(), description:  "Description " + i.toString())));
    }
    return result;
  }


}

没用！我在这里需要一个构建方法，但不明白我应该做什么。

Answer 1

这实际上有效：

class NotePageList extends PageableLazyList {

  NotePageList({Key key}) : super(key: key,
      scrollDirection: Axis.horizontal,
      itemCount : 10000,
      itemBuilder: itembuilder){
  }

  static List<NoteContainer> itembuilder (BuildContext context, num start, num count ){
    List<NoteContainer> result = <NoteContainer>[];
    for(num i = start; i < start+count; i++){
      result.add(new NoteContainer(new Note(title: "Note " + i.toString(), description:  "Description " + i.toString())));
    }
    return result;
  }


}