麻辣翅尖

flutter之graphic图表自定义tooltip

renderer

graphic中tooltip的TooltipGuide类提供了renderer方法，接收三个参数Size类型，Offset类型，Map类型。可查到的文档是真的少，所以只能在源码中扒拉例子，做符合需求的修改。

官方github示例

官方示例

这个例子感觉像是tooltip和提供的那些属性的源码实现，然后改变了背景颜色等，但如果实现想echarts那样对每条线的数据前增加颜色块区分，还是要自己摸索。先看一下这个例子都做了什么吧

List<MarkElement> simpleTooltip(
    Size size,
    Offset anchor,
    Map<int, Tuple> selectedTuples,
  ) {
    // 返回的元素列表
    List<MarkElement> elements;

    // 生成tooltip内容
    String textContent = '';
    // 选中的数据 ({date: xxx, name: 线条1, points: xxx}, {date: xx, name: 线条2, points: xx}...)
    final selectedTupleList = selectedTuples.values;
    // 选中的数据的字段名列表
    // 单条线：[date, points]
    // 多条线：会通过name区分不同线的数值[date, name, points]
    final fields = selectedTupleList.first.keys.toList();

    // 如果只有一条线
    if (selectedTuples.length == 1) {
      // 取出选中的数据
      final original = selectedTupleList.single;
      // 取出第一个字段的值
      var field = fields.first;
      // 将第一个字段的值放入到tooltip的第一行
      /**
       * 此时的数据结构是：
       * date: 2023-11-24
      */
      textContent += '$field: ${original[field]}';
      // 遍历字段名列表
      for (var i = 1; i < fields.length; i++) {
        // 取出第i个字段
        field = fields[i];
        // 将第i个字段的值放入到tooltip的第二行
        /**
         * 遍历后的数据结构是：
         * date: 2023-11-24
         * points: 123
        */
        textContent += '\n$field: ${original[field]}';
      }
    } else {
      // 如果有多条线
      // 遍历选中的数据（几条线几条数据），将每个数据的第二个字段和第三个字段的值放入到tooltip的第二行和第三行
      for (var original in selectedTupleList) {
        // 取出第一个字段
        final domainField = fields.first;
        // 取出最后一个字段
        final measureField = fields.last;
        /**
         * 遍历结束后的数据结构是：
         * 2023-11-24：线条1
         * 2023-11-24：线条2
         * ....
        */
        textContent += '\n${original[domainField]}: ${original[measureField]}';
      }
    }

    // 提出一些变量
    const textStyle = TextStyle(fontSize: 12, color: Colors.white);
    const padding = EdgeInsets.all(5);
    const align = Alignment.topRight;
    const offset = Offset(5, -5);
    const elevation = 1.0;
    const backgroundColor = Colors.black;

    final painter = TextPainter(
      text: TextSpan(text: textContent, style: textStyle),
      textDirection: TextDirection.ltr,
    );
    painter.layout();

    // 计算tooltip的宽高
    final width = padding.left + painter.width + padding.right;
    final height = padding.top + painter.height + padding.bottom;

    // 调整tooltip弹框（包含内容）的位置
    final paintPoint = getBlockPaintPoint(
      anchor + offset,
      width,
      height,
      align,
    );

    // 调整tooltip弹框（不包含内容）的位置
    final window = Rect.fromLTWH(
      paintPoint.dx,
      paintPoint.dy,
      width,
      height,
    );

    // 计算tooltip文本的位置
    var textPaintPoint = paintPoint + padding.topLeft;
    
    elements = <MarkElement>[
      RectElement(
          rect: window,
          style: PaintStyle(fillColor: backgroundColor, elevation: elevation)),
      LabelElement(
          text: textContent,
          anchor: textPaintPoint,
          style:
              LabelStyle(textStyle: textStyle, align: Alignment.bottomRight)),
    ];

    return elements;
  }

效果

根据需求调整

改动后代码

List<MarkElement> simpleTooltip(
    Size size,
    Offset anchor,
    Map<int, Tuple> selectedTuples,
  ) {
    // 返回的元素列表
    List<MarkElement> elements;
    // 标识元素列表
    List<MarkElement> tagElements = [];

    // 生成tooltip内容
    String textContent = '';
    // 选中的数据 ({date: xxx, name: 线条1, points: xxx}, {date: xx, name: 线条2, points: xx}...)
    final selectedTupleList = selectedTuples.values;
    // 选中的数据的字段名列表 [date, name, points]
    final fields = selectedTupleList.first.keys.toList();

    // 选中的数据的第一个数据的第一个字段的值，放入到tooltip的第一行
    /**
     * 目前的数据结构是：
     * 2023-11-24
     */
    textContent = '${selectedTupleList.first[fields.first]}';
    // 遍历选中的数据（几条线几条数据），将每个数据的第二个字段和第三个字段的值放入到tooltip的第二行和第三行
    for (var original in selectedTupleList) {
      final domainField = fields[1];
      final measureField = fields.last;
      /**
       * 遍历结束后的数据结构是：
       * 2023-11-24
       * 线条1: 123
       * 线条2: 456
       * ....
       */
      textContent += '\n  ${original[domainField]}: ${original[measureField]}';
    }

    // 提出一些变量
    const textStyle = TextStyle(fontSize: 12, color: Colors.black, height: 2);
    const padding = EdgeInsets.all(5);
    const align = Alignment.topRight;
    const offset = Offset(5, -5);
    const elevation = 1.0;
    const backgroundColor = Colors.white;

    final painter = TextPainter(
      text: TextSpan(text: textContent, style: textStyle),
      textDirection: ui.TextDirection.ltr,
    );
    painter.layout();

    // tooltip的宽高
    final width = padding.left + painter.width + padding.right;
    final height = padding.top + painter.height + padding.bottom;
    // tooltip的位置
    // 大概根据中间的数据判断算了下位置,避免一直在左或右,边界超出屏幕
    final move = anchor < const Offset(250, 90)
        ? anchor + offset - const Offset(-10, -40)
        : anchor + Offset(-width - 20, 40);

    final paintPoint = getBlockPaintPoint(
      move,
      width,
      height,
      align,
    );

    final window = Rect.fromLTWH(
      paintPoint.dx - 10, //横向位置
      paintPoint.dy,
      width + 20,
      height,
    );

    var textPaintPoint = paintPoint + padding.topLeft;

    // 生成tooltip线条前的标识元素
    for (int i = 0; i < selectedTupleList.length; i++) {
      tagElements.add(
        LabelElement(
            text: '●',
            anchor: textPaintPoint + padding.topLeft + Offset(-15, 26 + i * 23),
            style: LabelStyle(
                textStyle: TextStyle(
                    color: Defaults.colors10[i],
                    fontWeight: FontWeight.w900,
                    fontSize: 12),
                align: Alignment.bottomRight)),
      );
    }

    elements = <MarkElement>[
      RectElement(
          rect: window,
          style: PaintStyle(fillColor: backgroundColor, elevation: elevation)),
      ...tagElements,
      LabelElement(
          text: textContent,
          anchor: textPaintPoint,
          style:
              LabelStyle(textStyle: textStyle, align: Alignment.bottomRight)),
    ];

    return elements;
  }

效果

整体代码

// linePage.dart
import 'package:flutter/gestures.dart';
import 'package:flutter/material.dart';
import 'package:graphic/graphic.dart';
import 'dart:ui' as ui;
import './components/static/data.dart';

class linePage extends StatelessWidget {
  linePage({super.key});

  final GlobalKey<ScaffoldState> _scaffoldKey = GlobalKey<ScaffoldState>();

  List<MarkElement> simpleTooltip(
    Size size,
    Offset anchor,
    Map<int, Tuple> selectedTuples,
  ) {
    // 返回的元素列表
    List<MarkElement> elements;
    // 标识元素列表
    List<MarkElement> tagElements = [];

    // 生成tooltip内容
    String textContent = '';
    // 选中的数据 ({date: xxx, name: 线条1, points: xxx}, {date: xx, name: 线条2, points: xx}...)
    final selectedTupleList = selectedTuples.values;
    // 选中的数据的字段名列表 [date, name, points]
    final fields = selectedTupleList.first.keys.toList();

    // 选中的数据的第一个数据的第一个字段的值，放入到tooltip的第一行
    /**
     * 目前的数据结构是：
     * 2023-11-24
     */
    textContent = '${selectedTupleList.first[fields.first]}';

    // 遍历选中的数据（几条线几条数据），将每个数据的第二个字段和第三个字段的值放入到tooltip的第二行和第三行
    for (var original in selectedTupleList) {
      final domainField = fields[1];
      final measureField = fields.last;
      /**
       * 遍历结束后的数据结构是：
       * 2023-11-24
       * 线条1: 123
       * 线条2: 456
       * ....
       */
      textContent += '\n  ${original[domainField]}: ${original[measureField]}';
    }

    // 提出一些变量
    const textStyle = TextStyle(fontSize: 12, color: Colors.black, height: 2);
    const padding = EdgeInsets.all(5);
    const align = Alignment.topRight;
    const offset = Offset(5, -5);
    const elevation = 1.0;
    const backgroundColor = Colors.white;

    final painter = TextPainter(
      text: TextSpan(text: textContent, style: textStyle),
      textDirection: ui.TextDirection.ltr,
    );
    painter.layout();

    // tooltip的宽高
    final width = padding.left + painter.width + padding.right;
    final height = padding.top + painter.height + padding.bottom;
    // tooltip的位置
    // 大概根据中间的数据判断算了下位置,避免一直在左或右,边界超出屏幕
    final move = anchor < const Offset(250, 90)
        ? anchor + offset - const Offset(-10, -40)
        : anchor + Offset(-width - 20, 40);

    final paintPoint = getBlockPaintPoint(
      move,
      width,
      height,
      align,
    );

    final window = Rect.fromLTWH(
      paintPoint.dx - 10, //横向位置
      paintPoint.dy,
      width + 20,
      height,
    );

    var textPaintPoint = paintPoint + padding.topLeft;

    // 生成tooltip线条前的标识元素
    for (int i = 0; i < selectedTupleList.length; i++) {
      tagElements.add(
        LabelElement(
            text: '●',
            anchor: textPaintPoint + padding.topLeft + Offset(-15, 26 + i * 23),
            style: LabelStyle(
                textStyle: TextStyle(
                    color: Defaults.colors10[i],
                    fontWeight: FontWeight.w900,
                    fontSize: 12),
                align: Alignment.bottomRight)),
      );
    }

    elements = <MarkElement>[
      RectElement(
          rect: window,
          style: PaintStyle(fillColor: backgroundColor, elevation: elevation)),
      ...tagElements,
      LabelElement(
          text: textContent,
          anchor: textPaintPoint,
          style:
              LabelStyle(textStyle: textStyle, align: Alignment.bottomRight)),
    ];

    return elements;
  }

  @override
  Widget build(BuildContext context) {
    return SingleChildScrollView(
      child: Center(
        child: Column(
          children: <Widget>[
            Container(
              padding: const EdgeInsets.fromLTRB(20, 40, 20, 5),
              child: const Text(
                'Smooth Line and Area chart',
                style: TextStyle(fontSize: 20),
              ),
            ),
            Container(
              margin: const EdgeInsets.only(top: 10),
              width: 350,
              height: 300,
              child: Chart(
                // 数据源
                data: invalidData,
                // 变量配置
                variables: {
                  'date': Variable(
                    accessor: (Map map) => map['date'] as String,
                    scale: OrdinalScale(
                      tickCount: 5, // x轴刻度数量
                    ),
                  ),
                  'name': Variable(
                    accessor: (Map map) => map['name'] as String,
                  ),
                  'points': Variable(
                    accessor: (Map map) => (map['points'] ?? double.nan) as num,
                  ),
                },

                marks: [
                  // 线条
                  LineMark(
                  	// 如果单线条加name则必须有position属性配置，否则是一条直线
                    position:
                        Varset('date') * Varset('points') / Varset('name'),
                    shape: ShapeEncode(
                      value: BasicLineShape(smooth: true),
                    ),
                    // 粗细
                    size: SizeEncode(value: 1.5),
                  ),
                  // 线条与X轴之间区域填充
                  AreaMark(
                  	// 如果单线条加name则必须有position属性配置，否则不显示
                    position:
                        Varset('date') * Varset('points') / Varset('name'),
                    shape: ShapeEncode(
                      value:
                          BasicAreaShape(smooth: true), // smooth: true 使线条变得平滑
                    ),
                    color: ColorEncode(
                      value: Colors.pink.withAlpha(80),
                    ),
                  ),
                ],
                // 坐标轴配置
                axes: [
                  Defaults.horizontalAxis,
                  Defaults.verticalAxis,
                ],
                selections: {
                  'touchMove': PointSelection(
                    on: {
                      GestureType.scaleUpdate,
                      GestureType.tapDown,
                      GestureType.hover,
                      GestureType.longPressMoveUpdate
                    },
                    dim: Dim.x,
                  )
                },
                // 触摸弹框提示
                tooltip: TooltipGuide(
                  // 跟随鼠标位置
                  // followPointer: [false, true],
                  // align: Alignment.topLeft, // 弹框对于点击位置的对齐方式
                  // offset: const Offset(-20, -20), // 偏移量
                  // 使用自定义需要注释上面的一些配置
                  renderer: simpleTooltip,
                ),
                // 十字准线
                crosshair: CrosshairGuide(followPointer: [false, true]),
              ),
            ),
            Container(
              padding: const EdgeInsets.fromLTRB(20, 40, 20, 5),
              child: const Text(
                'Group interactions',
                style: TextStyle(fontSize: 20),
              ),
            ),
            Container(
              margin: const EdgeInsets.only(top: 10),
              width: 350,
              height: 300,
              child: Chart(
                data: invalidData1,
                variables: {
                  'date': Variable(
                    accessor: (Map map) => map['date'] as String,
                    scale: OrdinalScale(tickCount: 5, inflate: true),
                  ),
                  'name': Variable(
                    accessor: (Map map) => map['name'] as String,
                  ),
                  'points': Variable(
                    accessor: (Map map) => (map['points'] ?? double.nan) as num,
                  ),
                },
                coord: RectCoord(horizontalRange: [0.1, 0.99]),
                marks: [
                  LineMark(
                    position:
                        Varset('date') * Varset('points') / Varset('name'),
                    shape: ShapeEncode(value: BasicLineShape(smooth: true)),
                    size: SizeEncode(value: 1.5),
                    color: ColorEncode(
                      variable: 'name',
                      values: Defaults.colors10,
                      // updaters: {
                      //   'groupMouse': {false: (color) => color.withAlpha(100)},
                      //   // 'groupTouch': {false: (color) => color.withAlpha(100)},
                      // },
                    ),
                  ),
                  // PointMark(
                  //   color: ColorEncode(
                  //     variable: 'name',
                  //     values: Defaults.colors10,
                  //     updaters: {
                  //       'groupMouse': {false: (color) => color.withAlpha(100)},
                  //       'groupTouch': {false: (color) => color.withAlpha(100)},
                  //     },
                  //   ),
                  // ),
                ],
                axes: [
                  Defaults.horizontalAxis,
                  Defaults.verticalAxis,
                ],
                // // 提示框选项配置
                selections: {
                  '666': PointSelection(
                    on: {GestureType.hover, GestureType.tap},
                    // 设备
                    devices: {PointerDeviceKind.mouse},
                    variable: 'date',
                  ),
                  'groupMouse': PointSelection(
                    on: {
                      GestureType.hover,
                    },
                    // variable: 'name',

                    devices: {PointerDeviceKind.mouse},
                  ),
                  'tooltipTouch': PointSelection(
                    on: {
                      GestureType.scaleUpdate,
                      GestureType.tapDown,
                      GestureType.longPressMoveUpdate
                    },
                    // variable: 'name',
                    devices: {PointerDeviceKind.touch},
                  ),
                },
                tooltip: TooltipGuide(
                    selections: {'tooltipTouch', '666'},
                    // multiTuples: true,
                    // followPointer: [false, true],
                    // align: Alignment.topLeft,
                    // // mark: 0,
                    // // 与上方selections中定义的variable相排斥
                    // variables: [
                    //   // 'date',
                    //   'name',
                    //   'points',
                    // ],
                    renderer: simpleTooltip),
                crosshair: CrosshairGuide(
                  selections: {'tooltipTouch', '666'},
                  styles: [
                    PaintStyle(
                        strokeColor: const Color.fromARGB(255, 92, 68, 68)),
                    PaintStyle(
                        strokeColor: const Color.fromARGB(0, 158, 154, 154)),
                  ],
                  followPointer: [false, true],
                ),
              ),
            ),
          ],
        ),
      ),
    );
  }
}


// data.dart
const invalidData1 = [
  {"date": "2016-01-04", "name": "线条1", "points": 126.12},
  {"date": "2016-01-05", "name": "线条1", "points": 125.688},
  {"date": "2016-01-06", "name": "线条1", "points": 119.704},
  {"date": "2016-01-07", "name": "线条1", "points": 120.19},
  {"date": "2016-01-08", "name": "线条1", "points": 121.157},
  {"date": "2016-01-11", "name": "线条1", "points": 117},
  {"date": "2016-01-12", "name": "线条1", "points": 120},
  {"date": "2016-01-13", "name": "线条1", "points": 122},
  {"date": "2016-01-14", "name": "线条1", "points": 117.76},
  {"date": "2016-01-15", "name": "线条1", "points": 114.397},
  {"date": "2016-01-18", "name": "线条1", "points": 116.373},
  {"date": "2016-01-19", "name": "线条1", "points": 120.547},
  {"date": "2016-01-20", "name": "线条1", "points": 113.733},
  {"date": "2016-01-21", "name": "线条1", "points": 114.098},
  {"date": "2016-01-22", "name": "线条1", "points": 123.833},
  {"date": "2016-01-25", "name": "线条1", "points": 125},
  {"date": "2016-01-26", "name": "线条1", "points": 124.866},
  {"date": "2016-01-27", "name": "线条1", "points": 120.264},
  {"date": "2016-01-28", "name": "线条1", "points": 122.296},
  {"date": "2016-01-29", "name": "线条1", "points": 124.502},
  {"date": "2016-02-01", "name": "线条1", "points": 127.936},
  {"date": "2016-02-02", "name": "线条1", "points": null},
  {"date": "2016-02-03", "name": "线条1", "points": 129.95},
  {"date": "2016-02-04", "name": "线条1", "points": 129.275},
  {"date": "2016-02-05", "name": "线条1", "points": 127.898},
  {"date": "2016-02-08", "name": "线条1", "points": 134.9},
  {"date": "2016-02-09", "name": "线条1", "points": 122.819},
  {"date": "2016-02-10", "name": "线条1", "points": 120.108},
  {"date": "2016-02-11", "name": "线条1", "points": 119.447},
  {"date": "2016-02-12", "name": "线条1", "points": 117.8},
  {"date": "2016-02-15", "name": "线条1", "points": null},
  {"date": "2016-02-16", "name": "线条1", "points": 121.865},
  {"date": "2016-02-17", "name": "线条1", "points": 126.3},
  {"date": "2016-02-18", "name": "线条1", "points": 128.259},
  {"date": "2016-02-19", "name": "线条1", "points": 125.724},
  {"date": "2016-02-22", "name": "线条1", "points": 130},
  {"date": "2016-02-23", "name": "线条1", "points": 129.948},
  {"date": "2016-02-24", "name": "线条1", "points": 132.5},
  {"date": "2016-02-25", "name": "线条1", "points": 128.08},
  {"date": "2016-02-26", "name": "线条1", "points": 122},
  {"date": "2016-02-29", "name": "线条1", "points": 122},
  {"date": "2016-03-01", "name": "线条1", "points": 123.449},
  {"date": "2016-03-02", "name": "线条1", "points": double.nan},
  {"date": "2016-03-03", "name": "线条1", "points": 132},
  {"date": "2016-03-04", "name": "线条1", "points": 135},
  {"date": "2016-03-07", "name": "线条1", "points": 123.905},
  {"date": "2016-03-08", "name": "线条1", "points": 125.155},
  {"date": "2016-03-09", "name": "线条1", "points": 126},
  {"date": "2016-03-10", "name": "线条1", "points": 126.778},
  {"date": "2016-03-11", "name": "线条1", "points": 129.656},
  {"date": "2016-03-14", "name": "线条1", "points": 127.64},
  {"date": "2016-03-15", "name": "线条1", "points": 124.786},
  {"date": "2016-03-16", "name": "线条1", "points": 124.469},
  {"date": "2016-03-17", "name": "线条1", "points": 123.5},
  {"date": "2016-03-18", "name": "线条1", "points": 124.061},
  {"date": "2016-03-21", "name": "线条1", "points": 123.5},
  {"date": "2016-03-22", "name": "线条1", "points": 129.002},
  {"date": "2016-03-23", "name": "线条1", "points": 129},
  {"date": "2016-03-24", "name": "线条1", "points": 131.31},
  {"date": "2016-03-29", "name": "线条1", "points": 133},
  {"date": "2016-03-30", "name": "线条1", "points": 129.298},
  {"date": "2016-03-31", "name": "线条1", "points": 127.4},
  {"date": "2016-04-01", "name": "线条1", "points": 122.376},
  {"date": "2016-04-04", "name": "线条1", "points": 119.467},
  {"date": "2016-04-05", "name": "线条1", "points": 120.695},
  {"date": "2016-04-06", "name": "线条1", "points": 118.725},
  {"date": "2016-04-07", "name": "线条1", "points": 127.539},
  {"date": "2016-04-08", "name": "线条1", "points": 129.8},
  {"date": "2016-04-11", "name": "线条1", "points": 129.5},
  {"date": "2016-04-12", "name": "线条1", "points": 134.465},
  {"date": "2016-04-13", "name": "线条1", "points": 133},
  {"date": "2016-04-14", "name": "线条1", "points": 137.35},
  {"date": "2016-04-15", "name": "线条1", "points": 137.2},
  {"date": "2016-04-18", "name": "线条1", "points": 132.611},
  {"date": "2016-04-19", "name": "线条1", "points": 135.479},
  {"date": "2016-04-20", "name": "线条1", "points": 139.05},
  {"date": "2016-04-21", "name": "线条1", "points": 142},
  {"date": "2016-04-22", "name": "线条1", "points": 135.761},
  {"date": "2016-04-25", "name": "线条1", "points": 136.174},
  {"date": "2016-04-26", "name": "线条1", "points": 134.782},
  {"date": "2016-04-27", "name": "线条1", "points": 128},
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  {"date": "2016-06-10", "name": "线条1", "points": 133.041},
  {"date": "2016-06-13", "name": "线条1", "points": 129},
  {"date": "2016-06-14", "name": "线条1", "points": 129.166},
  {"date": "2016-06-15", "name": "线条1", "points": 124.687},
  {"date": "2016-06-16", "name": "线条1", "points": 122.77},
  {"date": "2016-06-17", "name": "线条1", "points": 126.461},
  {"date": "2016-06-20", "name": "线条1", "points": 127},
  {"date": "2016-06-21", "name": "线条1", "points": 125.594},
  {"date": "2016-06-22", "name": "线条1", "points": 127.438},
  {"date": "2016-06-23", "name": "线条1", "points": 124.44},
  {"date": "2016-06-24", "name": "线条1", "points": 122.131},
  {"date": "2016-06-27", "name": "线条1", "points": 120.53},
  {"date": "2016-06-28", "name": "线条1", "points": 120.296},
  {"date": "2016-06-29", "name": "线条1", "points": 125.877},
  {"date": "2016-06-30", "name": "线条1", "points": 126.404},
];

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