Question

我有一个Websocket应用程序，该应用程序使用StreamBuilder来构建GridView，数据每1秒流一次。现在，每隔1秒钟就会重新构建整个GridView，我认为这不是最佳的处理方式，因为我只想更新GridView中元素的内容。对于类似的情况，您会采取什么方法？

这是StreamBuilder

的代码


  Widget buildDataStream() {
    return StreamBuilder(
      stream: widget.channel.stream,
      builder: (context, snapshot) {
        return Container(
          child: snapshot.hasData ? buildRoomTiles(snapshot.data) : Container(),
        );
      },
    );
  }

这里是嵌套的组件

Widget buildRoomTiles(jsonString) {
    var nodeCount = 0;
    Map<String, Object> node = jsonDecode(jsonString);
    List<SensorNode> nodeList = [];

    node.forEach((key, value) {
      nodeCount++;
      var sensorNode = SensorNode.fromJson(node[key]);

      nodeList.add(sensorNode);
    });

    return GridView.count(
      crossAxisCount: 2,
      children: List.generate(
        nodeCount,
        (index) => buildSingleRoomCard(nodeList[index]),
      ),
    );
  }

  Widget buildSingleRoomCard(SensorNode node) {
    var smartSize = (MediaQuery.of(context).size.width - 40) / 2;
    return Padding(
      padding: const EdgeInsets.only(top: 15.0),
      child: Stack(
        alignment: Alignment.center,
        children: [
          Container(
            width: smartSize,
            height: smartSize,
            decoration: BoxDecoration(
              boxShadow: [
                BoxShadow(
                  color: Colors.black.withOpacity(0.25),
                  blurRadius: 7,
                  offset: Offset(0, 4),
                )
              ],
              borderRadius: BorderRadius.all(Radius.circular(10.0)),
              image: DecorationImage(
                image: AssetImage('assets/images/livingroom.jpg'),
                fit: BoxFit.cover,
                colorFilter: ColorFilter.mode(colorCommondorBlue.withOpacity(0.1), BlendMode.srcOver),
              ),
            ),
          ),
        ],
      ),
    );
  }

谢谢

流数据时如何避免重建整个GridView小部件

0 个答案: