VitalApp/lib/components/floating_window/index.dart

import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:vitalapp/pages/home/controller.dart';
import 'package:vitalapp/store/store.dart';

/// 悬浮组件
class HoveringPatientCard extends StatefulWidget {
  const HoveringPatientCard({
    Key? key,
    required this.child,
    required this.bgChild,
    this.alignment = AlignmentDirectional.topStart,
    this.textDirection,
    this.fit = StackFit.loose,
    this.clipBehavior = Clip.hardEdge,
    this.padding = EdgeInsets.zero,
    this.childSize = const Size(80, 80),
  }) : super(key: key);

  final AlignmentGeometry alignment;

  final TextDirection? textDirection;

  final StackFit fit;

  final Clip clipBehavior;

  /// 底部组件
  final Widget bgChild;

  /// 悬浮组件
  final Widget child;

  /// 悬浮组件宽高
  final Size childSize;

  /// 距离四周边界
  final EdgeInsets padding;

  @override
  _HoveringPatientCardState createState() => _HoveringPatientCardState();
}

class _HoveringPatientCardState extends State<HoveringPatientCard> {
  late ValueNotifier _topVN = ValueNotifier(0.0);
  late ValueNotifier _leftVN = ValueNotifier(0.0);
  late final ValueNotifier<bool> _panStart = ValueNotifier(false);
  @override
  Widget build(BuildContext context) {
    return Material(
      child: LayoutBuilder(builder: (context, constraints) {
        _topVN = ValueNotifier(186.0);
        _leftVN = ValueNotifier(constraints.maxWidth - widget.childSize.width);
        return Stack(
          alignment: widget.alignment,
          textDirection: widget.textDirection,
          fit: widget.fit,
          clipBehavior: widget.clipBehavior,
          children: [
            widget.bgChild,
            buildSuspension(
              child: widget.child,
              maxWidth: constraints.maxWidth,
              maxHeight: constraints.maxHeight,
            ),
          ],
        );
      }),
    );
  }

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

  buildSuspension({
    required Widget child,
    required double maxWidth,
    required double maxHeight,
  }) {
    return AnimatedBuilder(
      animation: Listenable.merge([
        _topVN,
        _leftVN,
      ]),
      child: child,
      builder: (context, child) {
        return Positioned(
          top: _topVN.value,
          left: _leftVN.value,
          child: GestureDetector(
            onTap: () {
              // _onChangePatint();
            },
            onPanStart: (details) {
              _panStart.value = true;
            },
            onPanEnd: (details) {
              _panStart.value = false;
              _leftVN.value = maxWidth - widget.childSize.width;
            },
            onPanUpdate: (DragUpdateDetails detail) => _onPanUpdate(
              detail,
              maxHeight,
              maxWidth,
            ),
            child: AnimatedBuilder(
              animation: _panStart,
              child: child,
              builder: (BuildContext context, Widget? child) {
                if (_panStart.value) {
                  return _buildHonver(child!);
                }
                return Container(
                  child: child,
                );
              },
            ),
          ),
        );
      },
    );
  }

  Widget _buildHonver(Widget child) {
    return Stack(
      children: [
        SizedBox(
          height: 80,
          child: Row(
            children: [
              Column(
                mainAxisAlignment: MainAxisAlignment.spaceBetween,
                children: const [
                  Icon(
                    Icons.keyboard_arrow_up_rounded,
                    size: 30,
                  ),
                  Icon(
                    Icons.keyboard_arrow_down_rounded,
                    size: 30,
                  ),
                ],
              ),
              SizedBox(
                height: 70,
                width: 70,
                child: child,
              ),
            ],
          ),
        ),
      ],
    );
  }

  Future<void> _onChangePatint() async {
    try {
      final homeController = Get.find<HomeController>();
      homeController.switchNavByName('/patient/list');
    } catch (e) {
      print(e);
    }
    Store.user.isShowUserCard = true;
  }

  _onPanUpdate(DragUpdateDetails detail, double maxHeight, double maxWidth) {
    //用户手指滑动时，更新偏移，重新构建
    //顶部
    if (_topVN.value < widget.padding.top && detail.delta.dy < 0) {
      return;
    }
    // 左边
    if (_leftVN.value < widget.padding.left && detail.delta.dx < 0) {
      return;
    }
    // 右边
    if (_topVN.value >
            (maxHeight - widget.childSize.height - widget.padding.bottom) &&
        detail.delta.dy > 0) {
      return;
    }
    // 下边
    if (_leftVN.value >
            (maxWidth - widget.childSize.width - widget.padding.right) &&
        detail.delta.dx > 0) {
      return;
    }
    _topVN.value += detail.delta.dy;
    print('update');

    /// 这边可以后面改成全局移动
    _leftVN.value += detail.delta.dx;
    // _leftVN.value = maxWidth - widget.childSize.width;
    // debugPrint("y:${_topVN.value}");
  }
}