huixiang_app/lib/view_widget/store_title_tab.dart

import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';
import 'package:huixiang/view_widget/icon_text.dart';

class StoreTitleTab extends StatefulWidget {
  final ScrollController scrollController;
  final List<String> brandText;

  final GlobalKey chiliGlobalKey;
  final GlobalKey milkTeaGlobalKey;
  final GlobalKey breadGlobalKey;

  final bool isScroll;

  StoreTitleTab(this.brandText,
      {this.scrollController,
      this.chiliGlobalKey,
      this.milkTeaGlobalKey,
      this.breadGlobalKey, this.isScroll = false});

  @override
  State<StatefulWidget> createState() {
    return _StoreTitleTab();
  }
}

class _StoreTitleTab extends State<StoreTitleTab> {
  int selectedIndex = -1;
  int selectedIndex1 = -1;
  bool isVisible = false;

  List<String> images = [
    "assets/image/icon_chili.webp",
    "assets/image/icon_milk_tea.webp",
    "assets/image/icon_bread.webp",
  ];

  @override
  void initState() {
    super.initState();

    if (widget.scrollController != null) {
      widget.scrollController?.addListener(() {
        RenderBox chiliRenderBox = widget.chiliGlobalKey.currentContext.findRenderObject();
        RenderBox milkTeaRenderBox = widget.milkTeaGlobalKey.currentContext.findRenderObject();
        RenderBox breadRenderBox = widget.breadGlobalKey.currentContext.findRenderObject();

        Offset chiliOffset = chiliRenderBox?.localToGlobal(Offset.zero);
        Offset milkTeaOffset = milkTeaRenderBox?.localToGlobal(Offset.zero);
        Offset breadOffset = breadRenderBox?.localToGlobal(Offset.zero);

        var top = 96.h;
        if (chiliOffset.dy <= top) {
          if (!isVisible) {
            isVisible = true;
            setState(() {});
          }
        } else {
          var b = isVisible;
          isVisible = false;
          if (b) setState(() {});
          selectedIndex = -1;
        }
        if (chiliOffset.dy <= top && breadOffset.dy > top) {
          selectedIndex = 0;
          if (selectedIndex1 != selectedIndex) {
            setState(() {
              print("object：$selectedIndex");
            });
            selectedIndex1 = selectedIndex;
          }
        } else if (breadOffset.dy <= top && milkTeaOffset.dy > top) {
          selectedIndex = 1;
          if (selectedIndex1 != selectedIndex) {
            setState(() {
              print("object：$selectedIndex");
            });
            selectedIndex1 = selectedIndex;
          }
        } else if (milkTeaOffset.dy <= top) {
          selectedIndex = 2;
          if (selectedIndex1 != selectedIndex) {
            setState(() {
              print("object：$selectedIndex");
            });
            selectedIndex1 = selectedIndex;
          }
        }
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    return Visibility(
      visible: (!widget.isScroll) ? true : isVisible,
      child: Container(
        width: MediaQuery.of(context).size.width,
        child: Container(
          height: 52.h,
          color: Colors.white,
          padding: EdgeInsets.all(6),
          alignment: Alignment.center,
          child: Row(
            mainAxisAlignment: MainAxisAlignment.spaceAround,
            crossAxisAlignment: CrossAxisAlignment.center,
            children: (widget.brandText == null || widget.brandText.isEmpty)
                ? []
                : (widget.brandText.map((e) {
                    return item(e, selectedIndex == widget.brandText.indexOf(e),
                        widget.brandText.indexOf(e));
                  }).toList()),
          ),
        ),
      ),
    );
  }

  Widget item(text, isSelected, index) {
    print("selectedIndex: $selectedIndex");
    return GestureDetector(
      onTap: () {
        FlexParentData parendData;
        if (index == 0) {
          parendData = widget.chiliGlobalKey.currentContext
              .findRenderObject()
              .parentData;
        } else if (index == 2) {
          parendData = widget.milkTeaGlobalKey.currentContext
              .findRenderObject()
              .parentData;
        } else if (index == 1) {
          parendData = widget.breadGlobalKey.currentContext
              .findRenderObject()
              .parentData;
        }
        double offset = parendData.offset.dy - 52.h + 20.h;
        widget.scrollController.animateTo(offset,
            duration: Duration(seconds: 1), curve: Curves.ease);
      },
      child: tabItem(text, isSelected, index),
    );
  }

  Widget tabItem(text, isSelected, index) {
    if (isSelected) {
      return IconText(
        text,
        isMax: false,
        rightImage: images[index],
        iconSize: 16,
        iconColor: Colors.red,
        textStyle: TextStyle(
            fontWeight: FontWeight.bold,
            fontSize: 16,
            color: Color(0xFF353535)),
      );
    } else {
      return IconText(
        text,
        isMax: false,
        textStyle: TextStyle(
            fontWeight: FontWeight.bold,
            fontSize: 16,
            color: Color(0xFF353535)),
      );
    }
  }
}