listview - 如何在 Flutter 中过滤 AlertDialog 中 ListView 中的数据？

Question

我在带有搜索(过滤器)的警报对话框中有 ListView。在正常屏幕中，列表搜索有效，但当我在 AlertDialog 中添加时，它不起作用。下面是我的代码，

return new AlertDialog(
    contentPadding: EdgeInsets.all(0.0),
    shape: RoundedRectangleBorder(
        borderRadius: BorderRadius.all(Radius.circular(5.0))),
    content: Container(
      width: screenSize.width * 0.9,
      height: screenSize.height * 0.5,
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.center,
        mainAxisAlignment: MainAxisAlignment.start,
        children: <Widget>[
          new Container(
            width: screenSize.width,
            height: 40,
            padding: EdgeInsets.only(left: 10, right: 10),
            color: const Color(colorPrimary),
            child: Align(
              child: Text("Scanned Serial Number",
                  style: TextStyle(
                      fontSize: 14.0,
                      fontWeight: FontWeight.w500,
                      fontFamily: 'helvetica',
                      color: Colors.white)),
              alignment: Alignment.centerLeft,
            ),
          ),
          Container(
            color: Color(colorAccent),
            padding: EdgeInsets.all(10),
            child: new Container(
              height: 40,
              decoration: BoxDecoration(
                  borderRadius: BorderRadius.all(Radius.circular(7)),
                  color: Colors.white),
              child: new Row(
                mainAxisSize: MainAxisSize.max,
                crossAxisAlignment: CrossAxisAlignment.center,
                children: [
                  Flexible(
                    child: Padding(
                      padding: EdgeInsets.only(left: 10),
                      child: new TextField(
                        controller:_search_controller,
                        decoration: new InputDecoration(
                          border: InputBorder.none,
                          hintStyle: TextStyle(color: Colors.grey),
                          hintText: "Search Label",
                          counterText: "",
                        ),
                        onChanged: (value) {
                          filterSearchResults(value);
                        },
                        maxLines: 1,
                        maxLength: 50,
                      ),
                    ),
                    flex: 1,
                  ),
                  Flexible(
                    child: IconButton(
                        onPressed: () {},
                        icon: Icon(
                          Icons.search,
                          color: const Color(colorPrimary),
                        )),
                    flex: 0,
                  )
                ],
              ),
            ),
          ),
          Expanded(
            child: widget.listStickerDisplay.length > 0
                ? new Container(
                    child: ListView.builder(
                      itemCount: widget.listStickerDisplay.length,
                      shrinkWrap: true,
                      itemBuilder: (BuildContext context, int index) {
                        return new Column(
                          children: <Widget>[
                            Container(
                              height: 35,
                              width: screenSize.width,
                              child: Align(
                                alignment: Alignment.center,
                                child: Text(
                                    "#" +
                                        listStickerDisplay[index]
                                            .intRowNo
                                            .toString() +
                                        "     " +
                                        listStickerDisplay[index]
                                            .varSticker,
                                    style: TextStyle(
                                      fontSize: 14.0,
                                      fontWeight: FontWeight.w400,
                                      fontFamily: 'helvetica',
                                    )),
                              ),
                            ),
                            Container(
                              width: screenSize.width,
                              color: Colors.black12,
                              height: 1,
                            ),
                          ],
                        );
                      },
                    ),
                  )
                : Container(
                    child: Column(
                      crossAxisAlignment: CrossAxisAlignment.center,
                      mainAxisAlignment: MainAxisAlignment.center,
                      children: <Widget>[
                        Image.asset(
                          "assets/nodata_icon.png",
                          height: 100,
                          width: 100,
                        ),
                        Padding(
                          padding: EdgeInsets.only(top: 10),
                          child: Text(
                            "No Data Found",
                            style: prifixTxtStyle,
                          ),
                        ),
                      ],
                    ),
                  ),
            flex: 1,
          ),
          Container(
            width: screenSize.width,
            height: 45,
            child: Row(
              children: <Widget>[
                Expanded(
                  child: ButtonDialogWidgets(
                    buttonName: 'Close',
                    buttonColor: const Color(colorPrimary),
                    textColor: Colors.white,
                    onTap: () {
                      Navigator.of(context).pop();
                    },
                  ),
                  flex: 1,
                ),
              ],
            ),
          ),
        ],
      ),
    )
);

下面是过滤函数:

void filterSearchResults(String query) {
  List<SalesSummarySKUStickerModel> dummySearchList =
      List<SalesSummarySKUStickerModel>();
  dummySearchList.addAll(widget.listSticker);
  if (query.isNotEmpty) {
    query = query.toLowerCase();
    List<SalesSummarySKUStickerModel> dummyListData =
        List<SalesSummarySKUStickerModel>();
    dummySearchList.forEach((item) {
      if (item.varSticker.toLowerCase().contains(query)) {
        dummyListData.add(item);
      }
    });
    if (mounted)
      setState(() {
        listStickerDisplay.clear();
        listStickerDisplay.addAll(dummyListData);
      });
  } else {
    if (mounted)
      setState(() {
        listStickerDisplay.clear();
        listStickerDisplay.addAll(widget.listSticker);
      });
  } 
}

Answer 1

为您的对话框创建另一个有状态的小部件。阅读this进一步了解。