deepvoice_client/lib/modules/meeting/controllers/mind_map_controller.dart

import 'dart:convert';
import 'dart:io';
import 'dart:typed_data';

import 'package:flutter/material.dart';
import 'package:flutter_easyloading/flutter_easyloading.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';
import 'package:get/get.dart';
import 'package:path_provider/path_provider.dart';
import 'package:share_plus/share_plus.dart';
import 'package:webview_flutter/webview_flutter.dart';

import 'meeting_details_controller.dart';

class MindMapController extends GetxController {
  late final WebViewController webViewController;
  final _meetingDetailsController = Get.find<MeetingDetailsController>();
  final double _width = 1.sw - 25.w;
  bool isWebViewReady = false;

  @override
  void onInit() {
    super.onInit();
    String html = '''
<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>MindMap</title>
  <script>${_meetingDetailsController.markmapLibJs}</script>
  <script>${_meetingDetailsController.d3Js}</script>
  <script>${_meetingDetailsController.markmapViewJs}</script>
  <script>${_meetingDetailsController.markmapToolbarJs}</script>
  <script>${_meetingDetailsController.saveSvgAsPngJs}</script>
  <style>
    html,
    body {
      width: 100%;
      height: 100%;
      min-width: ${_width}px;
      min-height: ${_width}px;
      margin: 0;
      padding: 0;
      overflow: hidden;
    }

    .mind-map {
      width: 100%;
      height: 100%;
      position: relative;
      overflow: hidden;
    }

    .mind-map #markmap {
      width: 100%;
      height: 100%;
    }

    .mind-map .mm-toolbar {
      height: 30px;
      background: #fff;
      border: 1px solid #d0d5dd;
      border-radius: 8px;
      display: flex;
      justify-content: space-around;
      align-items: center;
      position: absolute;
      top: 10px;
      right: 2px;
    }

    .mind-map .mm-toolbar-item {
      width: 24px;
      height: 24px;
      border-radius: 6px;
      cursor: pointer;
      color: #101828;
      display: flex;
      justify-content: center;
      align-items: center;
    }

    .mind-map .mm-toolbar-item.active {
      background-color: #d4d4d8;
    }
  </style>
</head>

<body>
  <div class="mind-map">
    <svg id="markmap"></svg>
    <div id="toolbar"></div>
  </div>
  <script>
    const { Transformer, Markmap, Toolbar } = window.markmap;
    const transformer = new Transformer();
    const { root } = transformer.transform(`${_meetingDetailsController.meetingDetails.value.summary}`);
    let mm = Markmap.create('#markmap', {
      maxWidth: 300,
      initialExpandLevel: 3,
    }, root);
    const toolbar = Toolbar.create(mm);
    toolbar.showBrand = false
    toolbar.render();
    const el = toolbar.el;
    const toolbarElement = document.getElementById('toolbar');
    toolbarElement.append(el);

    window.captureImage = async function() {
      const markmapElement = document.getElementById('markmap');
      markmapElement.style.height = `${_width}px`;
      await mm.fit();
      const options = {
        scale: 2,
        backgroundColor: '#FFFFFF',
        encoderOptions: 1,
      };
      const uri = await svgAsPngUri(markmapElement, options);
      markmapElement.style.height = '100%';
      mm.fit();
      if (window.ImageChannel) {
        window.ImageChannel.postMessage(uri);
      }
    }
  </script>
</body>

</html>
    ''';
    webViewController = WebViewController()
      ..setJavaScriptMode(JavaScriptMode.unrestricted)
      ..setNavigationDelegate(
        NavigationDelegate(
          onPageFinished: (String url) {
            isWebViewReady = true;
          },
        ),
      )
      ..addJavaScriptChannel(
        'ImageChannel',
        onMessageReceived: _messageReceived,
      )
      ..setBackgroundColor(Colors.transparent)
      ..loadHtmlString(html);
  }

  void _messageReceived(message) async {
    final String dataUrl = message.message;
    final String base64Str = dataUrl.split(',').last;
    final Uint8List bytes = base64.decode(base64Str);
    final String fileName =
        '${_meetingDetailsController.meetingData.value.title} mindmap.png';
    final tempDir = await getTemporaryDirectory();
    final File file = File('${tempDir.path}/$fileName');
    await file.writeAsBytes(bytes);
    final result = await SharePlus.instance.share(ShareParams(
      text: '分享思维导图',
      files: [XFile(file.path)],
    ));
    if (result.status == ShareResultStatus.success) {
      EasyLoading.showToast('分享完成！');
    }
  }
}