尝试针对魅族20系设计新的计算逻辑
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import 'package:flutter/material.dart';
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// --- 潘通色定义 ---
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const Color kHealthGreen = Color(0xFF00B140);
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const Color kHealthYellow = Color(0xFFEFDF00);
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const Color kHealthOrange = Color(0xFFD75A16);
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/// 趋势图柱状图组件
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class TrendChart extends StatelessWidget {
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final List<Map<String, dynamic>> data;
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final int designCap;
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const TrendChart({super.key, required this.data, required this.designCap});
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@override
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Widget build(BuildContext context) {
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List<Map<String, dynamic>> displayData = data.isNotEmpty
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? data
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: _getMockData();
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List<String> dates = displayData.map((e) {
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String date = e['date'] as String;
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var parts = date.split('-');
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return '${parts[1]}/${parts[2]}';
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}).toList();
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List<double> percents = displayData.map((e) {
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int cap = e['capacity'] as int;
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return (cap / designCap) * 100;
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}).toList();
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while (percents.length < 15) {
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percents.insert(0, 0);
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dates.insert(0, '');
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}
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if (percents.length > 15) {
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percents = percents.sublist(percents.length - 15);
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dates = dates.sublist(dates.length - 15);
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}
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int todayIndex = percents.length - 1;
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int sevenDaysAgoIndex = todayIndex - 7;
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bool showSevenDaysAgo = sevenDaysAgoIndex >= 0;
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String sevenDaysAgoDate = showSevenDaysAgo ? dates[sevenDaysAgoIndex] : '';
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String todayDate = dates[todayIndex];
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return Column(
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crossAxisAlignment: CrossAxisAlignment.start,
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children: [
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const Text(
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'容量百分比变动趋势（近15天）',
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style: TextStyle(fontSize: 16, fontWeight: FontWeight.w500),
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),
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const SizedBox(height: 8),
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Row(
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crossAxisAlignment: CrossAxisAlignment.start,
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children: [
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SizedBox(
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height: 180,
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child: Column(
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mainAxisAlignment: MainAxisAlignment.spaceBetween,
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children: const [
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Text(
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'100',
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style: TextStyle(
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fontSize: 10,
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color: Colors.grey,
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height: 1.0,
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),
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),
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Text(
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'70',
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style: TextStyle(
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fontSize: 10,
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color: Colors.grey,
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height: 1.0,
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),
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),
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],
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),
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),
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const SizedBox(width: 4),
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Expanded(
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child: LayoutBuilder(
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builder: (context, constraints) {
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double totalWidth = constraints.maxWidth;
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double step = totalWidth / 15;
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return SizedBox(
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height: 180,
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child: Stack(
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children: [
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Padding(
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padding: const EdgeInsets.only(bottom: 20),
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child: Row(
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crossAxisAlignment: CrossAxisAlignment.end,
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children: List.generate(percents.length, (index) {
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double value = percents[index];
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Color barColor;
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if (value > 0) {
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if (value >= 80) {
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barColor = kHealthGreen;
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} else if (value >= 70) {
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barColor = kHealthYellow;
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} else {
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barColor = Colors.red;
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}
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} else {
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barColor = Colors.grey.shade300;
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}
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double clampedValue = value.clamp(70.0, 100.0);
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double heightFactor =
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(clampedValue - 70.0) / 30.0;
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return Expanded(
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child: Align(
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alignment: Alignment.bottomCenter,
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child: Container(
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margin: const EdgeInsets.symmetric(
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horizontal: 2,
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),
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height: 20 + (100 * heightFactor),
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width: 18,
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decoration: BoxDecoration(
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color: barColor,
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borderRadius: BorderRadius.circular(4),
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),
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),
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),
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);
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}),
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),
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),
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if (showSevenDaysAgo && sevenDaysAgoDate.isNotEmpty)
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Positioned(
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left: sevenDaysAgoIndex * step + (step / 2) - 14,
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bottom: 2,
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child: Text(
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sevenDaysAgoDate,
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style: const TextStyle(
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fontSize: 9,
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color: Colors.grey,
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height: 1.0,
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),
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),
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),
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if (todayDate.isNotEmpty)
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Positioned(
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left: todayIndex * step + (step / 2) - 14,
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bottom: 2,
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child: Text(
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todayDate,
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style: const TextStyle(
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fontSize: 9,
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color: Colors.black,
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height: 1.0,
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fontWeight: FontWeight.w600,
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),
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),
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),
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],
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),
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);
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},
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),
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),
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],
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),
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if (percents.every((v) => v == 0))
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const Padding(
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padding: EdgeInsets.only(top: 8.0),
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child: Text(
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'暂无历史数据，请点击刷新按钮更新',
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style: TextStyle(fontSize: 12, color: Colors.grey),
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),
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),
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],
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);
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}
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List<Map<String, dynamic>> _getMockData() {
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List<String> mockDates = [
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'2026-06-14',
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'2026-06-15',
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'2026-06-16',
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'2026-06-17',
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'2026-06-18',
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'2026-06-19',
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'2026-06-20',
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'2026-06-21',
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'2026-06-22',
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'2026-06-23',
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'2026-06-24',
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'2026-06-25',
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'2026-06-26',
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'2026-06-27',
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'2026-06-28',
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];
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List<int> mockCap = [
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4635,
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4632,
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4628,
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4625,
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4620,
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4618,
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4615,
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4610,
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4608,
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4605,
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4600,
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4598,
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4595,
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4590,
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4585,
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];
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return List.generate(
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15,
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(i) => {'date': mockDates[i], 'capacity': mockCap[i]},
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);
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}
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}
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