in_app_webview.dart 70.5 KB
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484
import 'dart:io';
import 'dart:async';
import 'dart:collection';
import 'dart:typed_data';
import 'dart:convert';

import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter/widgets.dart';
import 'package:flutter/gestures.dart';

import 'package:html/parser.dart' show parse;

import 'types.dart';
import 'in_app_browser.dart';
import 'webview_options.dart';

const javaScriptHandlerForbiddenNames = ["onLoadResource", "shouldInterceptAjaxRequest", "onAjaxReadyStateChange", "onAjaxProgress", "shouldInterceptFetchRequest"];

///InAppWebView Widget class.
///
///Flutter Widget for adding an **inline native WebView** integrated in the flutter widget tree.
class InAppWebView extends StatefulWidget {

  ///Event fired when the [InAppWebView] is created.
  final void Function(InAppWebViewController controller) onWebViewCreated;

  ///Event fired when the [InAppWebView] starts to load an [url].
  final void Function(InAppWebViewController controller, String url) onLoadStart;

  ///Event fired when the [InAppWebView] finishes loading an [url].
  final void Function(InAppWebViewController controller, String url) onLoadStop;

  ///Event fired when the [InAppWebView] encounters an error loading an [url].
  final void Function(InAppWebViewController controller, String url, int code, String message) onLoadError;

  ///Event fired when the [InAppWebView] main page receives an HTTP error.
  ///
  ///[url] represents the url of the main page that received the HTTP error.
  ///
  ///[statusCode] represents the status code of the response. HTTP errors have status codes >= 400.
  ///
  ///[description] represents the description of the HTTP error. On iOS, it is always an empty string.
  ///
  ///**NOTE**: available on Android 23+.
  final void Function(InAppWebViewController controller, String url, int statusCode, String description) onLoadHttpError;

  ///Event fired when the current [progress] of loading a page is changed.
  final void Function(InAppWebViewController controller, int progress) onProgressChanged;

  ///Event fired when the [InAppWebView] receives a [ConsoleMessage].
  final void Function(InAppWebViewController controller, ConsoleMessage consoleMessage) onConsoleMessage;

  ///Give the host application a chance to take control when a URL is about to be loaded in the current WebView.
  ///
  ///**NOTE**: In order to be able to listen this event, you need to set [InAppWebViewOptions.useShouldOverrideUrlLoading] option to `true`.
  final void Function(InAppWebViewController controller, String url) shouldOverrideUrlLoading;

  ///Event fired when the [InAppWebView] loads a resource.
  ///
  ///**NOTE**: In order to be able to listen this event, you need to set [InAppWebViewOptions.useOnLoadResource] and [InAppWebViewOptions.javaScriptEnabled] options to `true`.
  final void Function(InAppWebViewController controller, LoadedResource resource) onLoadResource;

  ///Event fired when the [InAppWebView] scrolls.
  ///
  ///[x] represents the current horizontal scroll origin in pixels.
  ///
  ///[y] represents the current vertical scroll origin in pixels.
  final void Function(InAppWebViewController controller, int x, int y) onScrollChanged;

  ///Event fired when [InAppWebView] recognizes and starts a downloadable file.
  ///
  ///[url] represents the url of the file.
  ///
  ///**NOTE**: In order to be able to listen this event, you need to set [InAppWebViewOptions.useOnDownloadStart] option to `true`.
  final void Function(InAppWebViewController controller, String url) onDownloadStart;

  ///Event fired when the [InAppWebView] finds the `custom-scheme` while loading a resource. Here you can handle the url request and return a [CustomSchemeResponse] to load a specific resource encoded to `base64`.
  ///
  ///[scheme] represents the scheme of the url.
  ///
  ///[url] represents the url of the request.
  final Future<CustomSchemeResponse> Function(InAppWebViewController controller, String scheme, String url) onLoadResourceCustomScheme;

  ///Event fired when the [InAppWebView] tries to open a link with `target="_blank"`.
  ///
  ///[url] represents the url of the link.
  ///
  ///**NOTE**: In order to be able to listen this event, you need to set [InAppWebViewOptions.useOnTargetBlank] option to `true`.
  final void Function(InAppWebViewController controller, String url) onTargetBlank;

  ///Event that notifies the host application that web content from the specified origin is attempting to use the Geolocation API, but no permission state is currently set for that origin.
  ///Note that for applications targeting Android N and later SDKs (API level > `Build.VERSION_CODES.M`) this method is only called for requests originating from secure origins such as https.
  ///On non-secure origins geolocation requests are automatically denied.
  ///
  ///[origin] represents the origin of the web content attempting to use the Geolocation API.
  ///
  ///**NOTE**: available only on Android.
  final Future<GeolocationPermissionShowPromptResponse> Function(InAppWebViewController controller, String origin) onGeolocationPermissionsShowPrompt;

  ///Event fired when javascript calls the `alert()` method to display an alert dialog.
  ///If [JsAlertResponse.handledByClient] is `true`, the webview will assume that the client will handle the dialog.
  ///
  ///[message] represents the message to be displayed in the alert dialog.
  final Future<JsAlertResponse> Function(InAppWebViewController controller, String message) onJsAlert;

  ///Event fired when javascript calls the `confirm()` method to display a confirm dialog.
  ///If [JsConfirmResponse.handledByClient] is `true`, the webview will assume that the client will handle the dialog.
  ///
  ///[message] represents the message to be displayed in the alert dialog.
  final Future<JsConfirmResponse> Function(InAppWebViewController controller, String message) onJsConfirm;

  ///Event fired when javascript calls the `prompt()` method to display a prompt dialog.
  ///If [JsPromptResponse.handledByClient] is `true`, the webview will assume that the client will handle the dialog.
  ///
  ///[message] represents the message to be displayed in the alert dialog.
  ///
  ///[defaultValue] represents the default value displayed in the prompt dialog.
  final Future<JsPromptResponse> Function(InAppWebViewController controller, String message, String defaultValue) onJsPrompt;

  ///Event fired when the webview notifies that a loading URL has been flagged by Safe Browsing.
  ///The default behavior is to show an interstitial to the user, with the reporting checkbox visible.
  ///
  ///[url] represents the url of the request.
  ///
  ///[threatType] represents the reason the resource was caught by Safe Browsing, corresponding to a [SafeBrowsingThreat].
  ///
  ///**NOTE**: available only on Android.
  final Future<SafeBrowsingResponse> Function(InAppWebViewController controller, String url, SafeBrowsingThreat threatType) onSafeBrowsingHit;

  ///Event fired when the WebView received an HTTP authentication request. The default behavior is to cancel the request.
  ///
  ///[challenge] contains data about host, port, protocol, realm, etc. as specified in the [HttpAuthChallenge].
  final Future<HttpAuthResponse> Function(InAppWebViewController controller, HttpAuthChallenge challenge) onReceivedHttpAuthRequest;

  ///Event fired when the WebView need to perform server trust authentication (certificate validation).
  ///The host application must return either [ServerTrustAuthResponse] instance with [ServerTrustAuthResponseAction.CANCEL] or [ServerTrustAuthResponseAction.PROCEED].
  ///
  ///[challenge] contains data about host, port, protocol, realm, etc. as specified in the [ServerTrustChallenge].
  final Future<ServerTrustAuthResponse> Function(InAppWebViewController controller, ServerTrustChallenge challenge) onReceivedServerTrustAuthRequest;

  ///Notify the host application to handle a SSL client certificate request.
  ///Webview stores the response in memory (for the life of the application) if [ClientCertResponseAction.PROCEED] or [ClientCertResponseAction.CANCEL]
  ///is called and does not call [onReceivedClientCertRequest] again for the same host and port pair.
  ///Note that, multiple layers in chromium network stack might be caching the responses.
  ///
  ///[challenge] contains data about host, port, protocol, realm, etc. as specified in the [ClientCertChallenge].
  final Future<ClientCertResponse> Function(InAppWebViewController controller, ClientCertChallenge challenge) onReceivedClientCertRequest;

  ///Event fired as find-on-page operations progress.
  ///The listener may be notified multiple times while the operation is underway, and the numberOfMatches value should not be considered final unless [isDoneCounting] is true.
  ///
  ///[activeMatchOrdinal] represents the zero-based ordinal of the currently selected match.
  ///
  ///[numberOfMatches] represents how many matches have been found.
  ///
  ///[isDoneCounting] whether the find operation has actually completed.
  final void Function(InAppWebViewController controller, int activeMatchOrdinal, int numberOfMatches, bool isDoneCounting) onFindResultReceived;

  ///Event fired when an `XMLHttpRequest` is sent to a server.
  ///It gives the host application a chance to take control over the request before sending it.
  ///
  ///[ajaxRequest] represents the `XMLHttpRequest`.
  ///
  ///**NOTE**: In order to be able to listen this event, you need to set [InAppWebViewOptions.useShouldInterceptAjaxRequest] option to `true`.
  ///Also, unlike iOS that has [WKUserScript](https://developer.apple.com/documentation/webkit/wkuserscript) that
  ///can inject javascript code right after the document element is created but before any other content is loaded, in Android the javascript code
  ///used to intercept ajax requests is loaded as soon as possible so it won't be instantaneous as iOS but just after some milliseconds (< ~100ms).
  ///Inside the `window.addEventListener("flutterInAppBrowserPlatformReady")` event, the ajax requests will be intercept for sure.
  final Future<AjaxRequest> Function(InAppWebViewController controller, AjaxRequest ajaxRequest) shouldInterceptAjaxRequest;

  ///Event fired whenever the `readyState` attribute of an `XMLHttpRequest` changes.
  ///It gives the host application a chance to abort the request.
  ///
  ///[ajaxRequest] represents the [XMLHttpRequest].
  ///
  ///**NOTE**: In order to be able to listen this event, you need to set [InAppWebViewOptions.useShouldInterceptAjaxRequest] option to `true`.
  ///Also, unlike iOS that has [WKUserScript](https://developer.apple.com/documentation/webkit/wkuserscript) that
  ///can inject javascript code right after the document element is created but before any other content is loaded, in Android the javascript code
  ///used to intercept ajax requests is loaded as soon as possible so it won't be instantaneous as iOS but just after some milliseconds (< ~100ms).
  ///Inside the `window.addEventListener("flutterInAppBrowserPlatformReady")` event, the ajax requests will be intercept for sure.
  final Future<AjaxRequestAction> Function(InAppWebViewController controller, AjaxRequest ajaxRequest) onAjaxReadyStateChange;

  ///Event fired as an `XMLHttpRequest` progress.
  ///It gives the host application a chance to abort the request.
  ///
  ///[ajaxRequest] represents the [XMLHttpRequest].
  ///
  ///**NOTE**: In order to be able to listen this event, you need to set [InAppWebViewOptions.useShouldInterceptAjaxRequest] option to `true`.
  ///Also, unlike iOS that has [WKUserScript](https://developer.apple.com/documentation/webkit/wkuserscript) that
  ///can inject javascript code right after the document element is created but before any other content is loaded, in Android the javascript code
  ///used to intercept ajax requests is loaded as soon as possible so it won't be instantaneous as iOS but just after some milliseconds (< ~100ms).
  ///Inside the `window.addEventListener("flutterInAppBrowserPlatformReady")` event, the ajax requests will be intercept for sure.
  final Future<AjaxRequestAction> Function(InAppWebViewController controller, AjaxRequest ajaxRequest) onAjaxProgress;

  ///Event fired when a request is sent to a server through [Fetch API](https://developer.mozilla.org/it/docs/Web/API/Fetch_API).
  ///It gives the host application a chance to take control over the request before sending it.
  ///
  ///[fetchRequest] represents a resource request.
  ///
  ///**NOTE**: In order to be able to listen this event, you need to set [InAppWebViewOptions.useShouldInterceptFetchRequest] option to `true`.
  ///Also, unlike iOS that has [WKUserScript](https://developer.apple.com/documentation/webkit/wkuserscript) that
  ///can inject javascript code right after the document element is created but before any other content is loaded, in Android the javascript code
  ///used to intercept fetch requests is loaded as soon as possible so it won't be instantaneous as iOS but just after some milliseconds (< ~100ms).
  ///Inside the `window.addEventListener("flutterInAppBrowserPlatformReady")` event, the fetch requests will be intercept for sure.
  final Future<FetchRequest> Function(InAppWebViewController controller, FetchRequest fetchRequest) shouldInterceptFetchRequest;

  ///Event fired when the navigation state of the [InAppWebView] changes throught the usage of
  ///javascript **[History API](https://developer.mozilla.org/en-US/docs/Web/API/History_API)** functions (`pushState()`, `replaceState()`) and `onpopstate` event.
  ///
  ///Also, the event is fired when the javascript `window.location` changes without reloading the webview (for example appending or modifying an hash to the url).
  ///
  ///[url] represents the new url.
  final void Function(InAppWebViewController controller, String url) onNavigationStateChange;

  ///Event fired when the webview is requesting permission to access the specified resources and the permission currently isn't granted or denied.
  ///
  ///[origin] represents the origin of the web page which is trying to access the restricted resources.
  ///
  ///[resources] represents the array of resources the web content wants to access.
  ///
  ///**NOTE**: available only on Android 23+.
  final Future<PermissionRequestResponse> Function(InAppWebViewController controller, String origin, List<String> resources) onPermissionRequest;

  ///Initial url that will be loaded.
  final String initialUrl;
  ///Initial asset file that will be loaded. See [InAppWebView.loadFile()] for explanation.
  final String initialFile;
  ///Initial [InAppWebViewInitialData] that will be loaded.
  final InAppWebViewInitialData initialData;
  ///Initial headers that will be used.
  final Map<String, String> initialHeaders;
  ///Initial options that will be used.
  final InAppWebViewWidgetOptions initialOptions;
  /// `gestureRecognizers` specifies which gestures should be consumed by the web view.
  /// It is possible for other gesture recognizers to be competing with the web view on pointer
  /// events, e.g if the web view is inside a [ListView] the [ListView] will want to handle
  /// vertical drags. The web view will claim gestures that are recognized by any of the
  /// recognizers on this list.
  /// When `gestureRecognizers` is empty or null, the web view will only handle pointer events for gestures that
  /// were not claimed by any other gesture recognizer.
  final Set<Factory<OneSequenceGestureRecognizer>> gestureRecognizers;

  const InAppWebView({
    Key key,
    this.initialUrl = "about:blank",
    this.initialFile,
    this.initialData,
    this.initialHeaders = const {},
    this.initialOptions,
    this.onWebViewCreated,
    this.onLoadStart,
    this.onLoadStop,
    this.onLoadError,
    this.onLoadHttpError,
    this.onConsoleMessage,
    this.onProgressChanged,
    this.shouldOverrideUrlLoading,
    this.onLoadResource,
    this.onScrollChanged,
    this.onDownloadStart,
    this.onLoadResourceCustomScheme,
    this.onTargetBlank,
    this.onGeolocationPermissionsShowPrompt,
    this.onJsAlert,
    this.onJsConfirm,
    this.onJsPrompt,
    this.onSafeBrowsingHit,
    this.onReceivedHttpAuthRequest,
    this.onReceivedServerTrustAuthRequest,
    this.onReceivedClientCertRequest,
    this.onFindResultReceived,
    this.shouldInterceptAjaxRequest,
    this.onAjaxReadyStateChange,
    this.onAjaxProgress,
    this.shouldInterceptFetchRequest,
    this.onNavigationStateChange,
    this.onPermissionRequest,
    this.gestureRecognizers,
  }) : super(key: key);

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

class _InAppWebViewState extends State<InAppWebView> {

  InAppWebViewController _controller;

  @override
  Widget build(BuildContext context) {
    Map<String, dynamic> initialOptions = {};
    initialOptions.addAll(widget.initialOptions.inAppWebViewOptions?.toMap() ?? {});
    if (Platform.isAndroid)
      initialOptions.addAll(widget.initialOptions.androidInAppWebViewOptions?.toMap() ?? {});
    else if (Platform.isIOS)
      initialOptions.addAll(widget.initialOptions.iosInAppWebViewOptions?.toMap() ?? {});

    if (defaultTargetPlatform == TargetPlatform.android) {
      return AndroidView(
        viewType: 'com.pichillilorenzo/flutter_inappwebview',
        onPlatformViewCreated: _onPlatformViewCreated,
        gestureRecognizers: widget.gestureRecognizers,
        layoutDirection: TextDirection.rtl,
        creationParams: <String, dynamic>{
          'initialUrl': widget.initialUrl,
          'initialFile': widget.initialFile,
          'initialData': widget.initialData?.toMap(),
          'initialHeaders': widget.initialHeaders,
          'initialOptions': initialOptions
        },
        creationParamsCodec: const StandardMessageCodec(),
      );
      // onLongPress issue: https://github.com/flutter/plugins/blob/f31d16a6ca0c4bd6849cff925a00b6823973696b/packages/webview_flutter/lib/src/webview_android.dart#L31
      /*return GestureDetector(
        onLongPress: () {},
        excludeFromSemantics: true,
        child: AndroidView(
          viewType: 'com.pichillilorenzo/flutter_inappwebview',
          onPlatformViewCreated: _onPlatformViewCreated,
          gestureRecognizers: widget.gestureRecognizers,
          layoutDirection: TextDirection.rtl,
          creationParams: <String, dynamic>{
            'initialUrl': widget.initialUrl,
            'initialFile': widget.initialFile,
            'initialData': widget.initialData?.toMap(),
            'initialHeaders': widget.initialHeaders,
            'initialOptions': initialOptions
          },
          creationParamsCodec: const StandardMessageCodec(),
        ),
      );*/
    } else if (defaultTargetPlatform == TargetPlatform.iOS) {
      return UiKitView(
        viewType: 'com.pichillilorenzo/flutter_inappwebview',
        onPlatformViewCreated: _onPlatformViewCreated,
        gestureRecognizers: widget.gestureRecognizers,
        creationParams: <String, dynamic>{
          'initialUrl': widget.initialUrl,
          'initialFile': widget.initialFile,
          'initialData': widget.initialData?.toMap(),
          'initialHeaders': widget.initialHeaders,
          'initialOptions': initialOptions
        },
        creationParamsCodec: const StandardMessageCodec(),
      );
    }
    return Text(
        '$defaultTargetPlatform is not yet supported by the flutter_inappbrowser plugin');
  }

  @override
  void didUpdateWidget(InAppWebView oldWidget) {
    super.didUpdateWidget(oldWidget);
  }

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

  void _onPlatformViewCreated(int id) {
    _controller = InAppWebViewController(id, widget);
    if (widget.onWebViewCreated != null) {
      widget.onWebViewCreated(_controller);
    }
  }
}

/// Controls an [InAppWebView] widget instance.
///
/// An [InAppWebViewController] instance can be obtained by setting the [InAppWebView.onWebViewCreated]
/// callback for an [InAppWebView] widget.
class InAppWebViewController {

  InAppWebView _widget;
  MethodChannel _channel;
  Map<String, JavaScriptHandlerCallback> javaScriptHandlersMap = HashMap<String, JavaScriptHandlerCallback>();
  // ignore: unused_field
  bool _isOpened = false;
  // ignore: unused_field
  int _id;
  String _inAppBrowserUuid;
  InAppBrowser _inAppBrowser;


  InAppWebViewController(int id, InAppWebView widget) {
    this._id = id;
    this._channel = MethodChannel('com.pichillilorenzo/flutter_inappwebview_$id');
    this._channel.setMethodCallHandler(handleMethod);
    this._widget = widget;
  }

  InAppWebViewController.fromInAppBrowser(String uuid, MethodChannel channel, InAppBrowser inAppBrowser) {
    this._inAppBrowserUuid = uuid;
    this._channel = channel;
    this._inAppBrowser = inAppBrowser;
  }

  Future<dynamic> handleMethod(MethodCall call) async {
    switch(call.method) {
      case "onLoadStart":
        String url = call.arguments["url"];
        if (_widget != null && _widget.onLoadStart != null)
          _widget.onLoadStart(this, url);
        else if (_inAppBrowser != null)
          _inAppBrowser.onLoadStart(url);
        break;
      case "onLoadStop":
        String url = call.arguments["url"];
        if (_widget != null && _widget.onLoadStop != null)
          _widget.onLoadStop(this, url);
        else if (_inAppBrowser != null)
          _inAppBrowser.onLoadStop(url);
        break;
      case "onLoadError":
        String url = call.arguments["url"];
        int code = call.arguments["code"];
        String message = call.arguments["message"];
        if (_widget != null && _widget.onLoadError != null)
          _widget.onLoadError(this, url, code, message);
        else if (_inAppBrowser != null)
          _inAppBrowser.onLoadError(url, code, message);
        break;
      case "onLoadHttpError":
        String url = call.arguments["url"];
        int statusCode = call.arguments["statusCode"];
        String description = call.arguments["description"];
        if (_widget != null && _widget.onLoadHttpError != null)
          _widget.onLoadHttpError(this, url, statusCode, description);
        else if (_inAppBrowser != null)
          _inAppBrowser.onLoadHttpError(url, statusCode, description);
        break;
      case "onProgressChanged":
        int progress = call.arguments["progress"];
        if (_widget != null && _widget.onProgressChanged != null)
          _widget.onProgressChanged(this, progress);
        else if (_inAppBrowser != null)
          _inAppBrowser.onProgressChanged(progress);
        break;
      case "shouldOverrideUrlLoading":
        String url = call.arguments["url"];
        if (_widget != null && _widget.shouldOverrideUrlLoading != null)
          _widget.shouldOverrideUrlLoading(this, url);
        else if (_inAppBrowser != null)
          _inAppBrowser.shouldOverrideUrlLoading(url);
        break;
      case "onConsoleMessage":
        String message = call.arguments["message"];
        ConsoleMessageLevel messageLevel = ConsoleMessageLevel.fromValue(call.arguments["messageLevel"]);
        ConsoleMessage consoleMessage = ConsoleMessage(message: message, messageLevel: messageLevel);
        if (_widget != null && _widget.onConsoleMessage != null)
          _widget.onConsoleMessage(this, consoleMessage);
        else if (_inAppBrowser != null)
          _inAppBrowser.onConsoleMessage(consoleMessage);
        break;
      case "onScrollChanged":
        int x = call.arguments["x"];
        int y = call.arguments["y"];
        if (_widget != null && _widget.onScrollChanged != null)
          _widget.onScrollChanged(this, x, y);
        else if (_inAppBrowser != null)
          _inAppBrowser.onScrollChanged(x, y);
        break;
      case "onDownloadStart":
        String url = call.arguments["url"];
        if (_widget != null && _widget.onDownloadStart != null)
          _widget.onDownloadStart(this, url);
        else if (_inAppBrowser != null)
          _inAppBrowser.onDownloadStart(url);
        break;
      case "onLoadResourceCustomScheme":
        String scheme = call.arguments["scheme"];
        String url = call.arguments["url"];
        if (_widget != null && _widget.onLoadResourceCustomScheme != null) {
          try {
            var response = await _widget.onLoadResourceCustomScheme(this, scheme, url);
            return (response != null) ? response.toJson(): null;
          } catch (error) {
            print(error);
            return null;
          }
        } else if (_inAppBrowser != null) {
          try {
            var response = await _inAppBrowser.onLoadResourceCustomScheme(scheme, url);
            return (response != null) ? response.toJson(): null;
          } catch (error) {
            print(error);
            return null;
          }
        }
        break;
      case "onTargetBlank":
        String url = call.arguments["url"];
        if (_widget != null && _widget.onTargetBlank != null)
          _widget.onTargetBlank(this, url);
        else if (_inAppBrowser != null)
          _inAppBrowser.onTargetBlank(url);
        break;
      case "onGeolocationPermissionsShowPrompt":
        String origin = call.arguments["origin"];
        if (_widget != null && _widget.onGeolocationPermissionsShowPrompt != null)
          return (await _widget.onGeolocationPermissionsShowPrompt(this, origin))?.toMap();
        else if (_inAppBrowser != null)
          return (await _inAppBrowser.onGeolocationPermissionsShowPrompt(origin))?.toMap();
        break;
      case "onJsAlert":
        String message = call.arguments["message"];
        if (_widget != null && _widget.onJsAlert != null)
          return (await _widget.onJsAlert(this, message))?.toMap();
        else if (_inAppBrowser != null)
          return (await _inAppBrowser.onJsAlert(message))?.toMap();
        break;
      case "onJsConfirm":
        String message = call.arguments["message"];
        if (_widget != null && _widget.onJsConfirm != null)
          return (await _widget.onJsConfirm(this, message))?.toMap();
        else if (_inAppBrowser != null)
          return (await _inAppBrowser.onJsConfirm(message))?.toMap();
        break;
      case "onJsPrompt":
        String message = call.arguments["message"];
        String defaultValue = call.arguments["defaultValue"];
        if (_widget != null && _widget.onJsPrompt != null)
          return (await _widget.onJsPrompt(this, message, defaultValue))?.toMap();
        else if (_inAppBrowser != null)
          return (await _inAppBrowser.onJsPrompt(message, defaultValue))?.toMap();
        break;
      case "onSafeBrowsingHit":
        String url = call.arguments["url"];
        SafeBrowsingThreat threatType = SafeBrowsingThreat.fromValue(call.arguments["threatType"]);
        if (_widget != null && _widget.onSafeBrowsingHit != null)
          return (await _widget.onSafeBrowsingHit(this, url, threatType))?.toMap();
        else if (_inAppBrowser != null)
          return (await _inAppBrowser.onSafeBrowsingHit(url, threatType))?.toMap();
        break;
      case "onReceivedHttpAuthRequest":
        String host = call.arguments["host"];
        String protocol = call.arguments["protocol"];
        String realm = call.arguments["realm"];
        int port = call.arguments["port"];
        int previousFailureCount = call.arguments["previousFailureCount"];
        var protectionSpace = ProtectionSpace(host: host, protocol: protocol, realm: realm, port: port);
        var challenge = HttpAuthChallenge(previousFailureCount: previousFailureCount, protectionSpace: protectionSpace);
        if (_widget != null && _widget.onReceivedHttpAuthRequest != null)
          return (await _widget.onReceivedHttpAuthRequest(this, challenge))?.toMap();
        else if (_inAppBrowser != null)
          return (await _inAppBrowser.onReceivedHttpAuthRequest(challenge))?.toMap();
        break;
      case "onReceivedServerTrustAuthRequest":
        String host = call.arguments["host"];
        String protocol = call.arguments["protocol"];
        String realm = call.arguments["realm"];
        int port = call.arguments["port"];
        int error = call.arguments["error"];
        String message = call.arguments["message"];
        Uint8List serverCertificate = call.arguments["serverCertificate"];
        var protectionSpace = ProtectionSpace(host: host, protocol: protocol, realm: realm, port: port);
        var challenge = ServerTrustChallenge(protectionSpace: protectionSpace, error: error, message: message, serverCertificate: serverCertificate);
        if (_widget != null && _widget.onReceivedServerTrustAuthRequest != null)
          return (await _widget.onReceivedServerTrustAuthRequest(this, challenge))?.toMap();
        else if (_inAppBrowser != null)
          return (await _inAppBrowser.onReceivedServerTrustAuthRequest(challenge))?.toMap();
        break;
      case "onReceivedClientCertRequest":
        String host = call.arguments["host"];
        String protocol = call.arguments["protocol"];
        String realm = call.arguments["realm"];
        int port = call.arguments["port"];
        var protectionSpace = ProtectionSpace(host: host, protocol: protocol, realm: realm, port: port);
        var challenge = ClientCertChallenge(protectionSpace: protectionSpace);
        if (_widget != null && _widget.onReceivedClientCertRequest != null)
          return (await _widget.onReceivedClientCertRequest(this, challenge))?.toMap();
        else if (_inAppBrowser != null)
          return (await _inAppBrowser.onReceivedClientCertRequest(challenge))?.toMap();
        break;
      case "onFindResultReceived":
        int activeMatchOrdinal = call.arguments["activeMatchOrdinal"];
        int numberOfMatches = call.arguments["numberOfMatches"];
        bool isDoneCounting = call.arguments["isDoneCounting"];
        if (_widget != null && _widget.onFindResultReceived != null)
          _widget.onFindResultReceived(this, activeMatchOrdinal, numberOfMatches, isDoneCounting);
        else if (_inAppBrowser != null)
          _inAppBrowser.onFindResultReceived(activeMatchOrdinal, numberOfMatches, isDoneCounting);
        break;
      case "onNavigationStateChange":
        String url = call.arguments["url"];
        if (_widget != null && _widget.onNavigationStateChange != null)
          _widget.onNavigationStateChange(this, url);
        else if (_inAppBrowser != null)
          _inAppBrowser.onNavigationStateChange(url);
        break;
      case "onPermissionRequest":
        String origin = call.arguments["origin"];
        List<String> resources = call.arguments["resources"].cast<String>();
        if (_widget != null && _widget.onPermissionRequest != null)
          return (await _widget.onPermissionRequest(this, origin, resources))?.toMap();
        /*else if (_inAppBrowser != null)
          return (await  _inAppBrowser.onPermissionRequest(origin, resources))?.toMap();*/
        break;
      case "onCallJsHandler":
        String handlerName = call.arguments["handlerName"];
        // decode args to json
        List<dynamic> args = jsonDecode(call.arguments["args"]);

        switch(handlerName) {
          case "onLoadResource":
            Map<dynamic, dynamic> argMap = args[0];
            String initiatorType = argMap["initiatorType"];
            String url = argMap["name"];
            double startTime = argMap["startTime"] is int ? argMap["startTime"].toDouble() : argMap["startTime"];
            double duration = argMap["duration"] is int ? argMap["duration"].toDouble() : argMap["duration"];

            var response = new LoadedResource(initiatorType: initiatorType, url: url, startTime: startTime, duration: duration);

            if (_widget != null && _widget.onLoadResource != null)
              _widget.onLoadResource(this, response);
            else if (_inAppBrowser != null)
              _inAppBrowser.onLoadResource(response);
            return null;
          case "shouldInterceptAjaxRequest":
            Map<dynamic, dynamic> argMap = args[0];
            dynamic data = argMap["data"];
            String method = argMap["method"];
            String url = argMap["url"];
            bool isAsync = argMap["isAsync"];
            String user = argMap["user"];
            String password = argMap["password"];
            bool withCredentials = argMap["withCredentials"];
            AjaxRequestHeaders headers = AjaxRequestHeaders(argMap["headers"]);
            String responseType = argMap["responseType"];

            var request = new AjaxRequest(data: data, method: method, url: url, isAsync: isAsync, user: user, password: password, withCredentials: withCredentials, headers: headers, responseType: responseType);

            if (_widget != null && _widget.shouldInterceptAjaxRequest != null)
              return jsonEncode(await _widget.shouldInterceptAjaxRequest(this, request));
            else if (_inAppBrowser != null)
              return jsonEncode(await _inAppBrowser.shouldInterceptAjaxRequest(request));
            return null;
          case "onAjaxReadyStateChange":
            Map<dynamic, dynamic> argMap = args[0];
            dynamic data = argMap["data"];
            String method = argMap["method"];
            String url = argMap["url"];
            bool isAsync = argMap["isAsync"];
            String user = argMap["user"];
            String password = argMap["password"];
            bool withCredentials = argMap["withCredentials"];
            AjaxRequestHeaders headers = AjaxRequestHeaders(argMap["headers"]);
            int readyState = argMap["readyState"];
            int status = argMap["status"];
            String responseURL = argMap["responseURL"];
            String responseType = argMap["responseType"];
            dynamic response = argMap["response"];
            String responseText = argMap["responseText"];
            String responseXML = argMap["responseXML"];
            String statusText = argMap["statusText"];
            Map<dynamic, dynamic> responseHeaders = argMap["responseHeaders"];

            var request = new AjaxRequest(data: data, method: method, url: url, isAsync: isAsync, user: user, password: password,
                withCredentials: withCredentials, headers: headers, readyState: AjaxRequestReadyState.fromValue(readyState), status: status, responseURL: responseURL,
                responseType: responseType, response: response, responseText: responseText, responseXML: responseXML, statusText: statusText, responseHeaders: responseHeaders);

            if (_widget != null && _widget.onAjaxReadyStateChange != null)
              return jsonEncode(await _widget.onAjaxReadyStateChange(this, request));
            else if (_inAppBrowser != null)
              return jsonEncode(await _inAppBrowser.onAjaxReadyStateChange(request));
            return null;
          case "onAjaxProgress":
            Map<dynamic, dynamic> argMap = args[0];
            dynamic data = argMap["data"];
            String method = argMap["method"];
            String url = argMap["url"];
            bool isAsync = argMap["isAsync"];
            String user = argMap["user"];
            String password = argMap["password"];
            bool withCredentials = argMap["withCredentials"];
            AjaxRequestHeaders headers = AjaxRequestHeaders(argMap["headers"]);
            int readyState = argMap["readyState"];
            int status = argMap["status"];
            String responseURL = argMap["responseURL"];
            String responseType = argMap["responseType"];
            dynamic response = argMap["response"];
            String responseText = argMap["responseText"];
            String responseXML = argMap["responseXML"];
            String statusText = argMap["statusText"];
            Map<dynamic, dynamic> responseHeaders = argMap["responseHeaders"];
            Map<dynamic, dynamic> eventMap = argMap["event"];

            AjaxRequestEvent event = AjaxRequestEvent(lengthComputable: eventMap["lengthComputable"], loaded: eventMap["loaded"], total: eventMap["total"], type: AjaxRequestEventType.fromValue(eventMap["type"]));

            var request = new AjaxRequest(data: data, method: method, url: url, isAsync: isAsync, user: user, password: password,
                withCredentials: withCredentials, headers: headers, readyState: AjaxRequestReadyState.fromValue(readyState), status: status, responseURL: responseURL,
                responseType: responseType, response: response, responseText: responseText, responseXML: responseXML, statusText: statusText, responseHeaders: responseHeaders, event: event);

            if (_widget != null && _widget.onAjaxProgress != null)
              return jsonEncode(await _widget.onAjaxProgress(this, request));
            else if (_inAppBrowser != null)
              return jsonEncode(await _inAppBrowser.onAjaxProgress(request));
            return null;
          case "shouldInterceptFetchRequest":
            Map<dynamic, dynamic> argMap = args[0];
            String url = argMap["url"];
            String method = argMap["method"];
            Map<dynamic, dynamic> headers = argMap["headers"];
            Uint8List body = Uint8List.fromList(argMap["body"].cast<int>());
            String mode = argMap["mode"];
            FetchRequestCredential credentials = FetchRequest.createFetchRequestCredentialFromMap(argMap["credentials"]);
            String cache = argMap["cache"];
            String redirect = argMap["redirect"];
            String referrer = argMap["referrer"];
            String referrerPolicy = argMap["referrerPolicy"];
            String integrity = argMap["integrity"];
            bool keepalive = argMap["keepalive"];

            var request = new FetchRequest(url: url, method: method, headers: headers, body: body, mode: mode, credentials: credentials,
                cache: cache, redirect: redirect, referrer: referrer, referrerPolicy: referrerPolicy, integrity: integrity, keepalive: keepalive);

            if (_widget != null && _widget.shouldInterceptFetchRequest != null)
              return jsonEncode(await _widget.shouldInterceptFetchRequest(this, request));
            else if (_inAppBrowser != null)
              return jsonEncode(await _inAppBrowser.shouldInterceptFetchRequest(request));
            return null;
        }

        if (javaScriptHandlersMap.containsKey(handlerName)) {
          // convert result to json
          try {
            return jsonEncode(await javaScriptHandlersMap[handlerName](args));
          } catch (error) {
            print(error);
            return null;
          }
        }
        break;
      default:
        throw UnimplementedError("Unimplemented ${call.method} method");
    }
  }

  ///Gets the URL for the current page.
  ///This is not always the same as the URL passed to [InAppWebView.onLoadStarted] because although the load for that URL has begun, the current page may not have changed.
  Future<String> getUrl() async {
    Map<String, dynamic> args = <String, dynamic>{};
    if (_inAppBrowserUuid != null && _inAppBrowser != null) {
      _inAppBrowser.throwIsNotOpened();
      args.putIfAbsent('uuid', () => _inAppBrowserUuid);
    }
    return await _channel.invokeMethod('getUrl', args);
  }

  ///Gets the title for the current page.
  Future<String> getTitle() async {
    Map<String, dynamic> args = <String, dynamic>{};
    if (_inAppBrowserUuid != null && _inAppBrowser != null) {
      _inAppBrowser.throwIsNotOpened();
      args.putIfAbsent('uuid', () => _inAppBrowserUuid);
    }
    return await _channel.invokeMethod('getTitle', args);
  }

  ///Gets the progress for the current page. The progress value is between 0 and 100.
  Future<int> getProgress() async {
    Map<String, dynamic> args = <String, dynamic>{};
    if (_inAppBrowserUuid != null && _inAppBrowser != null) {
      _inAppBrowser.throwIsNotOpened();
      args.putIfAbsent('uuid', () => _inAppBrowserUuid);
    }
    return await _channel.invokeMethod('getProgress', args);
  }

  ///Gets the content html of the page. It first tries to get the content through javascript.
  ///If this doesn't work, it tries to get the content reading the file:
  ///- checking if it is an asset (`file:///`) or
  ///- downloading it using an `HttpClient` through the WebView's current url.
  Future<String> getHtml() async {
    var html = "";
    InAppWebViewWidgetOptions options = await getOptions();
    if (options != null && options.inAppWebViewOptions.javaScriptEnabled == true) {
      html = await evaluateJavascript(source: "window.document.getElementsByTagName('html')[0].outerHTML;");
      if (html != null && html.isNotEmpty)
        return html;
    }

    var webviewUrl = await getUrl();
    if (webviewUrl.startsWith("file:///")) {
      var assetPathSplitted = webviewUrl.split("/flutter_assets/");
      var assetPath = assetPathSplitted[assetPathSplitted.length - 1];
      var bytes = await rootBundle.load(assetPath);
      html = utf8.decode(bytes.buffer.asUint8List());
    }
    else {
      HttpClient client = new HttpClient();
      var url = Uri.parse(webviewUrl);
      try {
        var htmlRequest = await client.getUrl(url);
        html = await (await htmlRequest.close()).transform(Utf8Decoder()).join();
      } catch (e) {
        print(e);
      }
    }
    return html;
  }

  ///Gets the list of all favicons for the current page.
  Future<List<Favicon>> getFavicons() async {
    List<Favicon> favicons = [];

    HttpClient client = new HttpClient();
    var webviewUrl = await getUrl();
    var url = (webviewUrl.startsWith("file:///")) ? Uri.file(webviewUrl) : Uri.parse(webviewUrl);
    String manifestUrl;

    var html = await getHtml();
    if (html.isEmpty) {
        return favicons;
    }

    var assetPathBase;

    if (webviewUrl.startsWith("file:///")) {
      var assetPathSplitted = webviewUrl.split("/flutter_assets/");
      assetPathBase = assetPathSplitted[0] + "/flutter_assets/";
    }

    // get all link html elements
    var document = parse(html);
    var links = document.getElementsByTagName('link');
    for (var link in links) {
      var attributes = link.attributes;
      if (attributes["rel"] == "manifest") {
        manifestUrl = attributes["href"];
        if (!_isUrlAbsolute(manifestUrl)) {
          if (manifestUrl.startsWith("/")) {
            manifestUrl = manifestUrl.substring(1);
          }
          manifestUrl = ((assetPathBase == null) ? url.scheme + "://" + url.host + "/" : assetPathBase) + manifestUrl;
        }
        continue;
      }
      if (!attributes["rel"].contains("icon")) {
        continue;
      }
      favicons.addAll(_createFavicons(url, assetPathBase, attributes["href"], attributes["rel"], attributes["sizes"], false));
    }

    // try to get /favicon.ico
    try {
      var faviconUrl = url.scheme + "://" + url.host + "/favicon.ico";
      await client.headUrl(Uri.parse(faviconUrl));
      favicons.add(Favicon(url: faviconUrl, rel: "shortcut icon"));
    } catch(e) {
      print("/favicon.ico file not found: " + e.toString());
    }

    // try to get the manifest file
    HttpClientRequest manifestRequest;
    HttpClientResponse manifestResponse;
    bool manifestFound = false;
    if (manifestUrl == null) {
      manifestUrl = url.scheme + "://" + url.host + "/manifest.json";
    }
    try {
      manifestRequest = await client.getUrl(Uri.parse(manifestUrl));
      manifestResponse = await manifestRequest.close();
      manifestFound = manifestResponse.statusCode == 200 && manifestResponse.headers.contentType?.mimeType == "application/json";
    } catch(e) {
      print("Manifest file not found: " + e.toString());
    }

    if (manifestFound) {
      Map<String, dynamic> manifest = json.decode(await manifestResponse.transform(Utf8Decoder()).join());
      if (manifest.containsKey("icons")) {
        for(Map<String, dynamic> icon in manifest["icons"]) {
          favicons.addAll(_createFavicons(url, assetPathBase, icon["src"], icon["rel"], icon["sizes"], true));
        }
      }
    }

    return favicons;
  }

  bool _isUrlAbsolute(String url) {
    return url.startsWith("http://") || url.startsWith("https://");
  }

  List<Favicon> _createFavicons(Uri url, String assetPathBase, String urlIcon, String rel, String sizes, bool isManifest) {
    List<Favicon> favicons = [];

    List<String> urlSplitted = urlIcon.split("/");
    if (!_isUrlAbsolute(urlIcon)) {
      if (urlIcon.startsWith("/")) {
        urlIcon = urlIcon.substring(1);
      }
      urlIcon = ((assetPathBase == null) ? url.scheme + "://" + url.host + "/" : assetPathBase) + urlIcon;
    }
    if (isManifest) {
      rel = (sizes != null) ? urlSplitted[urlSplitted.length - 1].replaceFirst("-" + sizes, "").split(" ")[0].split(".")[0] : null;
    }
    if (sizes != null && sizes.isNotEmpty && sizes != "any") {
      List<String> sizesSplitted = sizes.split(" ");
      for (String size in sizesSplitted) {
        int width = int.parse(size.split("x")[0]);
        int height = int.parse(size.split("x")[1]);
        favicons.add(Favicon(url: urlIcon, rel: rel, width: width, height: height));
      }
    } else {
      favicons.add(Favicon(url: urlIcon, rel: rel, width: null, height: null));
    }

    return favicons;
  }

  ///Loads the given [url] with optional [headers] specified as a map from name to value.
  Future<void> loadUrl({@required String url, Map<String, String> headers = const {}}) async {
    assert(url != null && url.isNotEmpty);
    Map<String, dynamic> args = <String, dynamic>{};
    if (_inAppBrowserUuid != null && _inAppBrowser != null) {
      _inAppBrowser.throwIsNotOpened(message: 'Cannot laod $url!');
      args.putIfAbsent('uuid', () => _inAppBrowserUuid);
    }
    args.putIfAbsent('url', () => url);
    args.putIfAbsent('headers', () => headers);
    await _channel.invokeMethod('loadUrl', args);
  }

  ///Loads the given [url] with [postData] using `POST` method into this WebView.
  Future<void> postUrl({@required String url, @required Uint8List postData}) async {
    assert(url != null && url.isNotEmpty);
    assert(postData != null);
    Map<String, dynamic> args = <String, dynamic>{};
    if (_inAppBrowserUuid != null && _inAppBrowser != null) {
      _inAppBrowser.throwIsNotOpened(message: 'Cannot laod $url!');
      args.putIfAbsent('uuid', () => _inAppBrowserUuid);
    }
    args.putIfAbsent('url', () => url);
    args.putIfAbsent('postData', () => postData);
    await _channel.invokeMethod('postUrl', args);
  }

  ///Loads the given [data] into this WebView, using [baseUrl] as the base URL for the content.
  ///The [mimeType] parameter specifies the format of the data.
  ///The [encoding] parameter specifies the encoding of the data.
  Future<void> loadData({@required String data, String mimeType = "text/html", String encoding = "utf8", String baseUrl = "about:blank"}) async {
    assert(data != null);
    Map<String, dynamic> args = <String, dynamic>{};
    if (_inAppBrowserUuid != null && _inAppBrowser != null) {
      _inAppBrowser.throwIsNotOpened();
      args.putIfAbsent('uuid', () => _inAppBrowserUuid);
    }
    args.putIfAbsent('data', () => data);
    args.putIfAbsent('mimeType', () => mimeType);
    args.putIfAbsent('encoding', () => encoding);
    args.putIfAbsent('baseUrl', () => baseUrl);
    await _channel.invokeMethod('loadData', args);
  }

  ///Loads the given [assetFilePath] with optional [headers] specified as a map from name to value.
  ///
  ///To be able to load your local files (assets, js, css, etc.), you need to add them in the `assets` section of the `pubspec.yaml` file, otherwise they cannot be found!
  ///
  ///Example of a `pubspec.yaml` file:
  ///```yaml
  ///...
  ///
  ///# The following section is specific to Flutter.
  ///flutter:
  ///
  ///  # The following line ensures that the Material Icons font is
  ///  # included with your application, so that you can use the icons in
  ///  # the material Icons class.
  ///  uses-material-design: true
  ///
  ///  assets:
  ///    - assets/index.html
  ///    - assets/css/
  ///    - assets/images/
  ///
  ///...
  ///```
  ///Example of a `main.dart` file:
  ///```dart
  ///...
  ///inAppBrowser.loadFile("assets/index.html");
  ///...
  ///```
  Future<void> loadFile({@required String assetFilePath, Map<String, String> headers = const {}}) async {
    assert(assetFilePath != null && assetFilePath.isNotEmpty);
    Map<String, dynamic> args = <String, dynamic>{};
    if (_inAppBrowserUuid != null && _inAppBrowser != null) {
      _inAppBrowser.throwIsNotOpened(message: 'Cannot laod $assetFilePath!');
      args.putIfAbsent('uuid', () => _inAppBrowserUuid);
    }
    args.putIfAbsent('url', () => assetFilePath);
    args.putIfAbsent('headers', () => headers);
    await _channel.invokeMethod('loadFile', args);
  }

  ///Reloads the WebView.
  Future<void> reload() async {
    Map<String, dynamic> args = <String, dynamic>{};
    if (_inAppBrowserUuid != null && _inAppBrowser != null) {
      _inAppBrowser.throwIsNotOpened();
      args.putIfAbsent('uuid', () => _inAppBrowserUuid);
    }
    await _channel.invokeMethod('reload', args);
  }

  ///Goes back in the history of the WebView.
  Future<void> goBack() async {
    Map<String, dynamic> args = <String, dynamic>{};
    if (_inAppBrowserUuid != null && _inAppBrowser != null) {
      _inAppBrowser.throwIsNotOpened();
      args.putIfAbsent('uuid', () => _inAppBrowserUuid);
    }
    await _channel.invokeMethod('goBack', args);
  }

  ///Returns a boolean value indicating whether the WebView can move backward.
  Future<bool> canGoBack() async {
    Map<String, dynamic> args = <String, dynamic>{};
    if (_inAppBrowserUuid != null && _inAppBrowser != null) {
      _inAppBrowser.throwIsNotOpened();
      args.putIfAbsent('uuid', () => _inAppBrowserUuid);
    }
    return await _channel.invokeMethod('canGoBack', args);
  }

  ///Goes forward in the history of the WebView.
  Future<void> goForward() async {
    Map<String, dynamic> args = <String, dynamic>{};
    if (_inAppBrowserUuid != null && _inAppBrowser != null) {
      _inAppBrowser.throwIsNotOpened();
      args.putIfAbsent('uuid', () => _inAppBrowserUuid);
    }
    await _channel.invokeMethod('goForward', args);
  }

  ///Returns a boolean value indicating whether the WebView can move forward.
  Future<bool> canGoForward() async {
    Map<String, dynamic> args = <String, dynamic>{};
    if (_inAppBrowserUuid != null && _inAppBrowser != null) {
      _inAppBrowser.throwIsNotOpened();
      args.putIfAbsent('uuid', () => _inAppBrowserUuid);
    }
    return await _channel.invokeMethod('canGoForward', args);
  }

  ///Goes to the history item that is the number of steps away from the current item. Steps is negative if backward and positive if forward.
  Future<void> goBackOrForward({@required int steps}) async {
    assert(steps != null);

    Map<String, dynamic> args = <String, dynamic>{};
    if (_inAppBrowserUuid != null && _inAppBrowser != null) {
      _inAppBrowser.throwIsNotOpened();
      args.putIfAbsent('uuid', () => _inAppBrowserUuid);
    }
    args.putIfAbsent('steps', () => steps);
    await _channel.invokeMethod('goBackOrForward', args);
  }

  ///Returns a boolean value indicating whether the WebView can go back or forward the given number of steps. Steps is negative if backward and positive if forward.
  Future<bool> canGoBackOrForward({@required int steps}) async {
    assert(steps != null);

    Map<String, dynamic> args = <String, dynamic>{};
    if (_inAppBrowserUuid != null && _inAppBrowser != null) {
      _inAppBrowser.throwIsNotOpened();
      args.putIfAbsent('uuid', () => _inAppBrowserUuid);
    }
    args.putIfAbsent('steps', () => steps);
    return await _channel.invokeMethod('canGoBackOrForward', args);
  }

  ///Navigates to a [WebHistoryItem] from the back-forward [WebHistory.list] and sets it as the current item.
  Future<void> goTo({@required WebHistoryItem historyItem}) async {
    await goBackOrForward(steps: historyItem.offset);
  }

  ///Check if the WebView instance is in a loading state.
  Future<bool> isLoading() async {
    Map<String, dynamic> args = <String, dynamic>{};
    if (_inAppBrowserUuid != null && _inAppBrowser != null) {
      _inAppBrowser.throwIsNotOpened();
      args.putIfAbsent('uuid', () => _inAppBrowserUuid);
    }
    return await _channel.invokeMethod('isLoading', args);
  }

  ///Stops the WebView from loading.
  Future<void> stopLoading() async {
    Map<String, dynamic> args = <String, dynamic>{};
    if (_inAppBrowserUuid != null && _inAppBrowser != null) {
      _inAppBrowser.throwIsNotOpened();
      args.putIfAbsent('uuid', () => _inAppBrowserUuid);
    }
    await _channel.invokeMethod('stopLoading', args);
  }

  ///Evaluates JavaScript code into the WebView and returns the result of the evaluation.
  Future<dynamic> evaluateJavascript({@required String source}) async {
    Map<String, dynamic> args = <String, dynamic>{};
    if (_inAppBrowserUuid != null && _inAppBrowser != null) {
      _inAppBrowser.throwIsNotOpened();
      args.putIfAbsent('uuid', () => _inAppBrowserUuid);
    }
    args.putIfAbsent('source', () => source);
    var data = await _channel.invokeMethod('evaluateJavascript', args);
    if (data != null && Platform.isAndroid)
      data = json.decode(data);
    return data;
  }

  ///Injects an external JavaScript file into the WebView from a defined url.
  Future<void> injectJavascriptFileFromUrl({@required String urlFile}) async {
    Map<String, dynamic> args = <String, dynamic>{};
    if (_inAppBrowserUuid != null && _inAppBrowser != null) {
      _inAppBrowser.throwIsNotOpened();
      args.putIfAbsent('uuid', () => _inAppBrowserUuid);
    }
    args.putIfAbsent('urlFile', () => urlFile);
    await _channel.invokeMethod('injectJavascriptFileFromUrl', args);
  }
  
  ///Injects a JavaScript file into the WebView from the flutter assets directory.
  Future<void> injectJavascriptFileFromAsset({@required String assetFilePath}) async {
    String source = await rootBundle.loadString(assetFilePath);
    await evaluateJavascript(source: source);
  }

  ///Injects CSS into the WebView.
  Future<void> injectCSSCode({@required String source}) async {
    Map<String, dynamic> args = <String, dynamic>{};
    if (_inAppBrowserUuid != null && _inAppBrowser != null) {
      _inAppBrowser.throwIsNotOpened();
      args.putIfAbsent('uuid', () => _inAppBrowserUuid);
    }
    args.putIfAbsent('source', () => source);
    await _channel.invokeMethod('injectCSSCode', args);
  }

  ///Injects an external CSS file into the WebView from a defined url.
  Future<void> injectCSSFileFromUrl({@required String urlFile}) async {
    Map<String, dynamic> args = <String, dynamic>{};
    if (_inAppBrowserUuid != null && _inAppBrowser != null) {
      _inAppBrowser.throwIsNotOpened();
      args.putIfAbsent('uuid', () => _inAppBrowserUuid);
    }
    args.putIfAbsent('urlFile', () => urlFile);
    await _channel.invokeMethod('injectStyleFile', args);
  }

  ///Injects a CSS file into the WebView from the flutter assets directory.
  Future<void> injectCSSFileFromAsset({@required String assetFilePath}) async {
    String source = await rootBundle.loadString(assetFilePath);
    await injectCSSCode(source: source);
  }

  ///Adds a JavaScript message handler [callback] ([JavaScriptHandlerCallback]) that listen to post messages sent from JavaScript by the handler with name [handlerName].
  ///
  ///The Android implementation uses [addJavascriptInterface](https://developer.android.com/reference/android/webkit/WebView#addJavascriptInterface(java.lang.Object,%20java.lang.String)).
  ///The iOS implementation uses [addScriptMessageHandler](https://developer.apple.com/documentation/webkit/wkusercontentcontroller/1537172-addscriptmessagehandler?language=objc)
  ///
  ///The JavaScript function that can be used to call the handler is `window.flutter_inappbrowser.callHandler(handlerName <String>, ...args)`, where `args` are [rest parameters](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/rest_parameters).
  ///The `args` will be stringified automatically using `JSON.stringify(args)` method and then they will be decoded on the Dart side.
  ///
  ///In order to call `window.flutter_inappbrowser.callHandler(handlerName <String>, ...args)` properly, you need to wait and listen the JavaScript event `flutterInAppBrowserPlatformReady`.
  ///This event will be dispatched as soon as the platform (Android or iOS) is ready to handle the `callHandler` method.
  ///```javascript
  ///   window.addEventListener("flutterInAppBrowserPlatformReady", function(event) {
  ///     console.log("ready");
  ///   });
  ///```
  ///
  ///`window.flutter_inappbrowser.callHandler` returns a JavaScript [Promise](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise)
  ///that can be used to get the json result returned by [JavaScriptHandlerCallback].
  ///In this case, simply return data that you want to send and it will be automatically json encoded using [jsonEncode] from the `dart:convert` library.
  ///
  ///So, on the JavaScript side, to get data coming from the Dart side, you will use:
  ///```html
  ///<script>
  ///   window.addEventListener("flutterInAppBrowserPlatformReady", function(event) {
  ///     window.flutter_inappbrowser.callHandler('handlerFoo').then(function(result) {
  ///       console.log(result);
  ///     });
  ///
  ///     window.flutter_inappbrowser.callHandler('handlerFooWithArgs', 1, true, ['bar', 5], {foo: 'baz'}).then(function(result) {
  ///       console.log(result);
  ///     });
  ///   });
  ///</script>
  ///```
  ///
  ///Instead, on the `onLoadStop` WebView event, you can use `callHandler` directly:
  ///```dart
  ///  // Inject JavaScript that will receive data back from Flutter
  ///  inAppWebViewController.evaluateJavascript(source: """
  ///    window.flutter_inappbrowser.callHandler('test', 'Text from Javascript').then(function(result) {
  ///      console.log(result);
  ///    });
  ///  """);
  ///```
  void addJavaScriptHandler({@required String handlerName, @required JavaScriptHandlerCallback callback}) {
    assert(!javaScriptHandlerForbiddenNames.contains(handlerName));
    this.javaScriptHandlersMap[handlerName] = (callback);
  }

  ///Removes a JavaScript message handler previously added with the [addJavaScriptHandler()] associated to [handlerName] key.
  ///Returns the value associated with [handlerName] before it was removed.
  ///Returns `null` if [handlerName] was not found.
  JavaScriptHandlerCallback removeJavaScriptHandler({@required String handlerName}) {
    return this.javaScriptHandlersMap.remove(handlerName);
  }

  ///Takes a screenshot (in PNG format) of the WebView's visible viewport and returns a `Uint8List`. Returns `null` if it wasn't be able to take it.
  ///
  ///**NOTE for iOS**: available from iOS 11.0+.
  Future<Uint8List> takeScreenshot() async {
    Map<String, dynamic> args = <String, dynamic>{};
    if (_inAppBrowserUuid != null && _inAppBrowser != null) {
      _inAppBrowser.throwIsNotOpened();
      args.putIfAbsent('uuid', () => _inAppBrowserUuid);
    }
    return await _channel.invokeMethod('takeScreenshot', args);
  }

  ///Sets the WebView options with the new [options] and evaluates them.
  Future<void> setOptions({@required InAppWebViewWidgetOptions options}) async {
    Map<String, dynamic> args = <String, dynamic>{};
    if (_inAppBrowserUuid != null && _inAppBrowser != null) {
      _inAppBrowser.throwIsNotOpened();
      args.putIfAbsent('uuid', () => _inAppBrowserUuid);
    }

    Map<String, dynamic> optionsMap = {};
    optionsMap.addAll(options.inAppWebViewOptions?.toMap() ?? {});
    if (Platform.isAndroid)
      optionsMap.addAll(options.androidInAppWebViewOptions?.toMap() ?? {});
    else if (Platform.isIOS)
      optionsMap.addAll(options.iosInAppWebViewOptions?.toMap() ?? {});

    args.putIfAbsent('options', () => optionsMap);
    await _channel.invokeMethod('setOptions', args);
  }

  ///Gets the current WebView options. Returns the options with `null` value if they are not set yet.
  Future<InAppWebViewWidgetOptions> getOptions() async {
    Map<String, dynamic> args = <String, dynamic>{};
    if (_inAppBrowserUuid != null && _inAppBrowser != null) {
      _inAppBrowser.throwIsNotOpened();
      args.putIfAbsent('uuid', () => _inAppBrowserUuid);
    }

    InAppWebViewWidgetOptions inAppWebViewWidgetOptions = InAppWebViewWidgetOptions();
    Map<dynamic, dynamic> options = await _channel.invokeMethod('getOptions', args);
    if (options != null) {
      options = options.cast<String, dynamic>();
      inAppWebViewWidgetOptions.inAppWebViewOptions = InAppWebViewOptions.fromMap(options);
      if (Platform.isAndroid)
        inAppWebViewWidgetOptions.androidInAppWebViewOptions = AndroidInAppWebViewOptions.fromMap(options);
      else if (Platform.isIOS)
        inAppWebViewWidgetOptions.iosInAppWebViewOptions = IosInAppWebViewOptions.fromMap(options);
    }

    return inAppWebViewWidgetOptions;
  }

  ///Gets the WebHistory for this WebView. This contains the back/forward list for use in querying each item in the history stack.
  ///This contains only a snapshot of the current state.
  ///Multiple calls to this method may return different objects.
  ///The object returned from this method will not be updated to reflect any new state.
  Future<WebHistory> getCopyBackForwardList() async {
    Map<String, dynamic> args = <String, dynamic>{};
    if (_inAppBrowserUuid != null && _inAppBrowser != null) {
      _inAppBrowser.throwIsNotOpened();
      args.putIfAbsent('uuid', () => _inAppBrowserUuid);
    }
    Map<dynamic, dynamic> result = await _channel.invokeMethod('getCopyBackForwardList', args);
    result = result.cast<String, dynamic>();

    List<dynamic> historyListMap = result["history"];
    historyListMap = historyListMap.cast<LinkedHashMap<dynamic, dynamic>>();

    int currentIndex = result["currentIndex"];

    List<WebHistoryItem> historyList = List();
    for(var i = 0; i < historyListMap.length; i++) {
      LinkedHashMap<dynamic, dynamic> historyItem = historyListMap[i];
      historyList.add(WebHistoryItem(originalUrl: historyItem["originalUrl"], title: historyItem["title"], url: historyItem["url"], index: i, offset: i - currentIndex));
    }
    return WebHistory(list: historyList, currentIndex: currentIndex);
  }

  ///Starts Safe Browsing initialization.
  ///
  ///URL loads are not guaranteed to be protected by Safe Browsing until after the this method returns true.
  ///Safe Browsing is not fully supported on all devices. For those devices this method will returns false.
  ///
  ///This should not be called if Safe Browsing has been disabled by manifest tag
  ///or [AndroidInAppWebViewOptions.safeBrowsingEnabled]. This prepares resources used for Safe Browsing.
  ///
  ///**NOTE**: available only on Android 27+.
  Future<bool> startSafeBrowsing() async {
    Map<String, dynamic> args = <String, dynamic>{};
    if (_inAppBrowserUuid != null && _inAppBrowser != null) {
      _inAppBrowser.throwIsNotOpened();
      args.putIfAbsent('uuid', () => _inAppBrowserUuid);
    }
    return await _channel.invokeMethod('startSafeBrowsing', args);
  }

  ///Sets the list of hosts (domain names/IP addresses) that are exempt from SafeBrowsing checks. The list is global for all the WebViews.
  ///
  /// Each rule should take one of these:
  ///| Rule | Example | Matches Subdomain |
  ///| -- | -- | -- |
  ///| HOSTNAME | example.com | Yes |
  ///| .HOSTNAME | .example.com | No |
  ///| IPV4_LITERAL | 192.168.1.1 | No |
  ///| IPV6_LITERAL_WITH_BRACKETS | [10:20:30:40:50:60:70:80] | No |
  ///
  ///All other rules, including wildcards, are invalid. The correct syntax for hosts is defined by [RFC 3986](https://tools.ietf.org/html/rfc3986#section-3.2.2).
  ///
  ///[hosts] represents the list of hosts. This value must never be null.
  ///
  ///**NOTE**: available only on Android 27+.
  Future<bool> setSafeBrowsingWhitelist({@required List<String> hosts}) async {
    assert(hosts != null);
    Map<String, dynamic> args = <String, dynamic>{};
    if (_inAppBrowserUuid != null && _inAppBrowser != null) {
      _inAppBrowser.throwIsNotOpened();
      args.putIfAbsent('uuid', () => _inAppBrowserUuid);
    }
    args.putIfAbsent('hosts', () => hosts);
    return await _channel.invokeMethod('setSafeBrowsingWhitelist', args);
  }

  ///Returns a URL pointing to the privacy policy for Safe Browsing reporting. This value will never be `null`.
  ///
  ///**NOTE**: available only on Android 27+.
  Future<String> getSafeBrowsingPrivacyPolicyUrl() async {
    Map<String, dynamic> args = <String, dynamic>{};
    if (_inAppBrowserUuid != null && _inAppBrowser != null) {
      _inAppBrowser.throwIsNotOpened();
      args.putIfAbsent('uuid', () => _inAppBrowserUuid);
    }
    return await _channel.invokeMethod('getSafeBrowsingPrivacyPolicyUrl', args);
  }

  ///Clears all the webview's cache.
  Future<void> clearCache() async {
    Map<String, dynamic> args = <String, dynamic>{};
    if (_inAppBrowserUuid != null && _inAppBrowser != null) {
      _inAppBrowser.throwIsNotOpened();
      args.putIfAbsent('uuid', () => _inAppBrowserUuid);
    }
    await _channel.invokeMethod('clearCache', args);
  }

  ///Clears the SSL preferences table stored in response to proceeding with SSL certificate errors.
  ///
  ///**NOTE**: available only on Android.
  Future<void> clearSslPreferences() async {
    Map<String, dynamic> args = <String, dynamic>{};
    if (_inAppBrowserUuid != null && _inAppBrowser != null) {
      _inAppBrowser.throwIsNotOpened();
      args.putIfAbsent('uuid', () => _inAppBrowserUuid);
    }
    await _channel.invokeMethod('clearSslPreferences', args);
  }

  ///Clears the client certificate preferences stored in response to proceeding/cancelling client cert requests.
  ///Note that WebView automatically clears these preferences when the system keychain is updated.
  ///The preferences are shared by all the WebViews that are created by the embedder application.
  ///
  ///**NOTE**: On iOS certificate-based credentials are never stored permanently.
  ///
  ///**NOTE**: available on Android 21+.
  Future<void> clearClientCertPreferences() async {
    Map<String, dynamic> args = <String, dynamic>{};
    if (_inAppBrowserUuid != null && _inAppBrowser != null) {
      _inAppBrowser.throwIsNotOpened();
      args.putIfAbsent('uuid', () => _inAppBrowserUuid);
    }
    await _channel.invokeMethod('clearClientCertPreferences', args);
  }

  ///Finds all instances of find on the page and highlights them. Notifies [onFindResultReceived] listener.
  ///
  ///[find] represents the string to find.
  ///
  ///**NOTE**: on Android, it finds all instances asynchronously. Successive calls to this will cancel any pending searches.
  ///
  ///**NOTE**: on iOS, this is implemented using CSS and Javascript.
  Future<void> findAllAsync({@required String find}) async {
    assert(find != null);
    Map<String, dynamic> args = <String, dynamic>{};
    if (_inAppBrowserUuid != null && _inAppBrowser != null) {
      _inAppBrowser.throwIsNotOpened();
      args.putIfAbsent('uuid', () => _inAppBrowserUuid);
    }
    args.putIfAbsent('find', () => find);
    await _channel.invokeMethod('findAllAsync', args);
  }

  ///Highlights and scrolls to the next match found by [findAllAsync()]. Notifies [onFindResultReceived] listener.
  ///
  ///[forward] represents the direction to search.
  ///
  ///**NOTE**: on iOS, this is implemented using CSS and Javascript.
  Future<void> findNext({@required bool forward}) async {
    assert(forward != null);
    Map<String, dynamic> args = <String, dynamic>{};
    if (_inAppBrowserUuid != null && _inAppBrowser != null) {
      _inAppBrowser.throwIsNotOpened();
      args.putIfAbsent('uuid', () => _inAppBrowserUuid);
    }
    args.putIfAbsent('forward', () => forward);
    await _channel.invokeMethod('findNext', args);
  }

  ///Clears the highlighting surrounding text matches created by [findAllAsync()].
  ///
  ///**NOTE**: on iOS, this is implemented using CSS and Javascript.
  Future<void> clearMatches() async {
    Map<String, dynamic> args = <String, dynamic>{};
    if (_inAppBrowserUuid != null && _inAppBrowser != null) {
      _inAppBrowser.throwIsNotOpened();
      args.putIfAbsent('uuid', () => _inAppBrowserUuid);
    }
    await _channel.invokeMethod('clearMatches', args);
  }

  ///Gets the html (with javascript) of the Chromium's t-rex runner game. Used in combination with [getTRexRunnerCss()].
  Future<String> getTRexRunnerHtml() async {
    return await rootBundle.loadString("packages/flutter_inappbrowser/t_rex_runner/t-rex.html");
  }

  ///Gets the css of the Chromium's t-rex runner game. Used in combination with [getTRexRunnerHtml()].
  Future<String> getTRexRunnerCss() async {
    return await rootBundle.loadString("packages/flutter_inappbrowser/t_rex_runner/t-rex.css");
  }

  ///Scrolls the WebView to the position.
  ///
  ///[x] represents the x position to scroll to.
  ///
  ///[y] represents the y position to scroll to.
  Future<void> scrollTo({@required int x, @required int y}) async {
    assert(x != null && y != null);
    Map<String, dynamic> args = <String, dynamic>{};
    if (_inAppBrowserUuid != null && _inAppBrowser != null) {
      _inAppBrowser.throwIsNotOpened();
      args.putIfAbsent('uuid', () => _inAppBrowserUuid);
    }
    args.putIfAbsent('x', () => x);
    args.putIfAbsent('y', () => y);
    await _channel.invokeMethod('scrollTo', args);
  }

  ///Moves the scrolled position of the WebView.
  ///
  ///[x] represents the amount of pixels to scroll by horizontally.
  ///
  ///[y] represents the amount of pixels to scroll by vertically.
  Future<void> scrollBy({@required int x, @required int y}) async {
    assert(x != null && y != null);
    Map<String, dynamic> args = <String, dynamic>{};
    if (_inAppBrowserUuid != null && _inAppBrowser != null) {
      _inAppBrowser.throwIsNotOpened();
      args.putIfAbsent('uuid', () => _inAppBrowserUuid);
    }
    args.putIfAbsent('x', () => x);
    args.putIfAbsent('y', () => y);
    await _channel.invokeMethod('scrollBy', args);
  }

  /*Future<void> dispose() async {
    Map<String, dynamic> args = <String, dynamic>{};
    if (Platform.isIOS)
      await _channel.invokeMethod('removeFromSuperview', args);
  }*/
}