用Firestore和Flutter填充数据表(使用StreamBuilder) [英] Filling a DataTable with Firestore and Flutter (using StreamBuilder)

问题描述

如何使用StreamBuilder填充数据表?

How to populate a DataTable using StreamBuilder?

下面是我的代码:

          new StreamBuilder(
            stream: widget._returnStreamWithActiveKeysOnly(),
            builder: (BuildContext context, AsyncSnapshot<QuerySnapshot> snapshot) {
              if (!snapshot.hasData) return new Text('Loading...');
              return new DataTable(
                columns: <DataColumn>[
                  new DataColumn(
                    label: Text('type'),
                    tooltip: 'Ordinary or service (1 day only, restricted time)',
                  ),
                  new DataColumn(label: Text('Key')),
                  new DataColumn(label: Text('Check-in')),
                  new DataColumn(label: Text('Check-out')),
                ],
                rows: _listOfRows(snapshot),

              );
            },
          )

我找不到一种方法(例如内置生成器)来指示文档索引传递给 _listOfRows 函数，或如何访问每个流的当前文档.

I couldn't find a way (like a built-in builder) to indicate the document index to pass to the _listOfRows function, or how to access the current document for each stream.

推荐答案

我不知道什么数据来自您的流，但是下面是有关如何做的想法:

I dont know what data comes from your stream, but here is on idea on how to do it:

 DataTable(
   rows: _createRows(snapshot.data),
 )

您希望您的构建器方法返回 List< DataRow>

You want your builder method to return List<DataRow>

  List<DataRow> _createRows(QuerySnapshot snapshot) {

    List<DataRow> newList = snapshot.documents.map((DocumentSnapshot documentSnapshot) {
      return new DataRow(cells: _createCellsForElement(documentSnapshot["someDataYouWantToProcessForCellData"]));
    }).toList();

    return newList;
  }

您可以将相同的逻辑应用于单元格的创建，也可以在第一个map函数中进行.

You can apply the same logic for cell creation, or you can do it inside the first map function as well.

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