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  1. import 'dart:convert';
  2. import 'package:flutter/material.dart';
  3. import 'package:webview_flutter/webview_flutter.dart';
  4. import 'package:zhiying_comm/zhiying_comm.dart';
  5. // 淘宝详情图加载
  6. class TaobaoImageLoader extends StatefulWidget {
  7. final String url;
  8. String script;
  9. final ValueChanged<List<String>> onImagesLoad;
  10. TaobaoImageLoader(this.url, {Key key, this.script, this.onImagesLoad})
  11. : super(key: key) {
  12. this.script = script;
  13. if (EmptyUtil.isEmpty(this.script)) {
  14. this.script =
  15. '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';
  16. }
  17. }
  18. @override
  19. _TaobaoImageLoaderState createState() => _TaobaoImageLoaderState();
  20. }
  21. class _TaobaoImageLoaderState extends State<TaobaoImageLoader> {
  22. WebViewController _webViewController;
  23. List<String> _images = [];
  24. @override
  25. Widget build(BuildContext context) {
  26. return WebView(
  27. initialUrl: widget.url,
  28. javascriptMode: JavascriptMode.unrestricted,
  29. onWebViewCreated: (WebViewController webViewController) {
  30. _webViewController = webViewController;
  31. },
  32. javascriptChannels: <JavascriptChannel>[
  33. _imageLoaderJavascriptChannel(context),
  34. ].toSet(),
  35. navigationDelegate: (NavigationRequest request) {
  36. print('allowing navigation to $request');
  37. return NavigationDecision.navigate;
  38. },
  39. onPageStarted: (String url) {
  40. print('Page started loading: $url');
  41. },
  42. onPageFinished: (String url) {
  43. _loadImages();
  44. },
  45. gestureNavigationEnabled: true,
  46. );
  47. }
  48. void _loadImages() {
  49. String js = EncodeUtil.decodeBase64(widget.script);
  50. _webViewController.evaluateJavascript(js).then((result) {});
  51. }
  52. JavascriptChannel _imageLoaderJavascriptChannel(BuildContext context) {
  53. return JavascriptChannel(
  54. name: 'Loader',
  55. onMessageReceived: (JavascriptMessage message) {
  56. if (widget.onImagesLoad != null) {
  57. List list = jsonDecode(message.message);
  58. if (list.length != _images.length) {
  59. Future.delayed(Duration(milliseconds: 1000), () {
  60. _loadImages();
  61. });
  62. _images = list.map((item) => item.toString()).toList();
  63. widget.onImagesLoad(_images);
  64. } else {
  65. print('图片抓取结束');
  66. }
  67. }
  68. });
  69. }
  70. }