added WebHistory and WebHistoryItem class, added getCopyBackForwardList,...

added WebHistory and WebHistoryItem class, added getCopyBackForwardList, goBackOrForward, canGoBackOrForward and goTo methods for InAppWebView and InAppBrowser, updated docs

CHANGELOG.md

 ## 0.5.4
 
 - added `WebHistory` and `WebHistoryItem` class
-- added `getCopyBackForwardList` method for `InAppWebView` and `InAppBrowser`
+- added `getCopyBackForwardList`, `goBackOrForward`, `canGoBackOrForward` and `goTo` methods for `InAppWebView` and `InAppBrowser`
 
 ## 0.5.3
 

android/src/main/java/com/pichillilorenzo/flutter_inappbrowser/FlutterWebView.java

@@ -162,6 +162,14 @@ public class FlutterWebView implements PlatformView, MethodCallHandler  {
       case "canGoForward":
         result.success((webView != null) && webView.canGoForward());
         break;
+      case "goBackOrForward":
+        if (webView != null)
+          webView.goBackOrForward((Integer) call.argument("steps"));
+        result.success(true);
+        break;
+      case "canGoBackOrForward":
+        result.success((webView != null) && webView.canGoBackOrForward((Integer) call.argument("steps")));
+        break;
       case "stopLoading":
         if (webView != null)
           webView.stopLoading();

android/src/main/java/com/pichillilorenzo/flutter_inappbrowser/InAppBrowserActivity.java

@@ -238,17 +238,32 @@ public class InAppBrowserActivity extends AppCompatActivity {
       webView.goBack();
   }
 
+  public boolean canGoBack() {
+    if (webView != null)
+      return webView.canGoBack();
+    return false;
+  }
+
   public void goForward() {
     if (webView != null && canGoForward())
       webView.goForward();
   }
 
-  public boolean canGoBack() {
-    return webView.canGoBack();
-  }
-
   public boolean canGoForward() {
+    if (webView != null)
       return webView.canGoForward();
+    return false;
+  }
+
+  public void goBackOrForward(int steps) {
+    if (webView != null && canGoBackOrForward(steps))
+      webView.goBackOrForward(steps);
+  }
+
+  public boolean canGoBackOrForward(int steps) {
+    if (webView != null)
+      return webView.canGoBackOrForward(steps);
+    return false;
   }
 
   public void hide() {

android/src/main/java/com/pichillilorenzo/flutter_inappbrowser/InAppBrowserFlutterPlugin.java

@@ -233,6 +233,13 @@ public class InAppBrowserFlutterPlugin implements MethodCallHandler {
       case "canGoForward":
         result.success(canGoForward(uuid));
         break;
+      case "goBackOrForward":
+        goBackOrForward(uuid, (Integer) call.argument("steps"));
+        result.success(true);
+        break;
+      case "canGoBackOrForward":
+        result.success(canGoBackOrForward(uuid, (Integer) call.argument("steps")));
+        break;
       case "stopLoading":
         stopLoading(uuid);
         result.success(true);
@@ -497,6 +504,18 @@ public class InAppBrowserFlutterPlugin implements MethodCallHandler {
     return false;
   }
 
+  public void goBackOrForward(String uuid, int steps) {
+    InAppBrowserActivity inAppBrowserActivity = webViewActivities.get(uuid);
+    if (inAppBrowserActivity != null)
+      inAppBrowserActivity.goBackOrForward(steps);
+  }
+
+  public boolean canGoBackOrForward(String uuid, int steps) {
+    InAppBrowserActivity inAppBrowserActivity = webViewActivities.get(uuid);
+    if (inAppBrowserActivity != null)
+      return inAppBrowserActivity.canGoBackOrForward(steps);
+    return false;
+  }
 
   public static void close(final String uuid, final Result result) {
     final InAppBrowserActivity inAppBrowserActivity = webViewActivities.get(uuid);

android/src/main/java/com/pichillilorenzo/flutter_inappbrowser/InAppWebView/InAppWebView.java

@@ -97,6 +97,12 @@ public class InAppWebView extends WebView {
     this.options = options;
   }
 
+  @Override
+  public void reload() {
+    super.reload();
+    Log.d(LOG_TAG, "RELOAD");
+  }
+
   public void prepare() {
 
     boolean isFromInAppBrowserActivity = inAppBrowserActivity != null;

example/lib/main.dart

@@ -16,12 +16,21 @@ class MyInAppBrowser extends InAppBrowser {
   Future onLoadStop(String url) async {
     print("\n\nStopped $url\n\n");
 
-    WebHistory history = await this.webViewController.getCopyBackForwardList();
-    print(history.list.length);
-    print(history.list[history.currentIndex].url);
-    for(WebHistoryItem item in history.list) {
-      print(item.title);
-    }
+//    WebHistory history = await this.webViewController.getCopyBackForwardList();
+//    print(history.list.length);
+//    print(history.currentIndex);
+//    print(history.list[history.currentIndex].url);
+//    for(WebHistoryItem item in history.list) {
+//      print(item.title);
+//    }
+//
+//    print(await this.webViewController.canGoBackOrForward(1));
+//    if (await this.webViewController.canGoBackOrForward(-2)) {
+//      this.webViewController.goTo(history.list[0]);
+//    }
+
+//    await this.webViewController.goBackOrForward(-1);
+
 //    print(await this.webViewController.canGoBack());
 //    print(await this.webViewController.canGoForward());
 

ios/Classes/InAppBrowserWebViewController.swift

@@ -481,10 +481,6 @@ class InAppBrowserWebViewController: UIViewController, WKUIDelegate, WKNavigatio
         })
     }
     
-    func canGoBack() -> Bool {
-        return webView.canGoBack
-    }
-    
     @objc func goBack() {
         if canGoBack() {
             webView.goBack()
@@ -492,8 +488,8 @@ class InAppBrowserWebViewController: UIViewController, WKUIDelegate, WKNavigatio
         }
     }
     
-    func canGoForward() -> Bool {
-        return webView.canGoForward
+    func canGoBack() -> Bool {
+        return webView.canGoBack
     }
     
     @objc func goForward() {
@@ -503,6 +499,19 @@ class InAppBrowserWebViewController: UIViewController, WKUIDelegate, WKNavigatio
         }
     }
     
+    func canGoForward() -> Bool {
+        return webView.canGoForward
+    }
+    
+    @objc func goBackOrForward(steps: Int) {
+        webView.goBackOrForward(steps: steps)
+        updateUrlTextField(url: (webView?.url?.absoluteString)!)
+    }
+    
+    func canGoBackOrForward(steps: Int) -> Bool {
+        return webView.canGoBackOrForward(steps: steps)
+    }
+    
     func updateUrlTextField(url: String) {
         urlField.text = url
     }

ios/Classes/InAppWebView.swift

@@ -10,4 +10,25 @@ import WebKit
 
 public class InAppWebView: WKWebView {
     
+    public func goBackOrForward(steps: Int) {
+        if canGoBackOrForward(steps: steps) {
+            if (steps > 0) {
+                let index = steps - 1
+                go(to: self.backForwardList.forwardList[index])
+            }
+            else if (steps < 0){
+                let backListLength = self.backForwardList.backList.count
+                let index = backListLength + steps
+                go(to: self.backForwardList.backList[index])
+            }
+        }
+    }
+    
+    public func canGoBackOrForward(steps: Int) -> Bool {
+        let currentIndex = self.backForwardList.backList.count
+        return (steps >= 0)
+            ? steps <= self.backForwardList.forwardList.count
+            : currentIndex + steps >= 0
+    }
+    
 }

ios/Classes/SwiftFlutterPlugin.swift

@@ -129,6 +129,22 @@ public class SwiftFlutterPlugin: NSObject, FlutterPlugin {
                     result(false)
                 }
                 break
+            case "goBackOrForward":
+                if let webViewController = self.webViewControllers[uuid] {
+                    let steps = arguments!["steps"] as! Int
+                    webViewController?.goBackOrForward(steps: steps)
+                }
+                result(true)
+                break
+            case "canGoBackOrForward":
+                if let webViewController = self.webViewControllers[uuid] {
+                    let steps = arguments!["steps"] as! Int
+                    result(webViewController?.canGoBackOrForward(steps: steps) ?? false)
+                }
+                else {
+                    result(false)
+                }
+                break
             case "isLoading":
                 if let webViewController = self.webViewControllers[uuid] {
                     result((webViewController?.webView.isLoading ?? false) == true)

lib/flutter_inappbrowser.dart

@@ -903,6 +903,37 @@ class InAppWebViewController {
     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(int steps) async {
+    assert(steps != null);
+
+    Map<String, dynamic> args = <String, dynamic>{};
+    if (_inAppBrowserUuid != null) {
+      _inAppBrowser._throwIsNotOpened();
+      args.putIfAbsent('uuid', () => _inAppBrowserUuid);
+    }
+    args.putIfAbsent('steps', () => steps);
+    await _channel.invokeMethod('goBackOrForward', args);
+  }
+
+  ///Gets whether the page can go back or forward the given number of steps.
+  Future<bool> canGoBackOrForward(int steps) async {
+    assert(steps != null);
+
+    Map<String, dynamic> args = <String, dynamic>{};
+    if (_inAppBrowserUuid != null) {
+      _inAppBrowser._throwIsNotOpened();
+      args.putIfAbsent('uuid', () => _inAppBrowserUuid);
+    }
+    args.putIfAbsent('steps', () => steps);
+    return await _channel.invokeMethod('canGoBackOrForward', args);
+  }
+
+  ///Navigates to an item from the back-forward list and sets it as the current item.
+  Future<void> goTo(WebHistoryItem historyItem) async {
+    await goBackOrForward(historyItem.offset);
+  }
+
   ///Check if the Web View of the [InAppWebView] instance is in a loading state.
   Future<bool> isLoading() async {
     Map<String, dynamic> args = <String, dynamic>{};
@@ -1050,8 +1081,9 @@ class InAppWebViewController {
     int currentIndex = result["currentIndex"];
 
     List<WebHistoryItem> historyList = List();
-    for(LinkedHashMap<dynamic, dynamic> historyItem in historyListMap) {
-      historyList.add(WebHistoryItem(historyItem["originalUrl"], historyItem["title"], historyItem["url"]));
+    for(var i = 0; i < historyListMap.length; i++) {
+      LinkedHashMap<dynamic, dynamic> historyItem = historyListMap[i];
+      historyList.add(WebHistoryItem(historyItem["originalUrl"], historyItem["title"], historyItem["url"], i, i - currentIndex));
     }
     return WebHistory(historyList, currentIndex);
   }
@@ -1067,7 +1099,9 @@ class InAppWebViewController {
 ///This class contains a snapshot of the current back/forward list for a WebView.
 class WebHistory {
   List<WebHistoryItem> _list;
+  ///List of all [WebHistoryItem]s.
   List<WebHistoryItem> get list => _list;
+  ///Index of the current [WebHistoryItem].
   int currentIndex;
 
   WebHistory(this._list, this.currentIndex);
@@ -1077,11 +1111,18 @@ class WebHistory {
 ///
 ///A convenience class for accessing fields in an entry in the back/forward list of a WebView. Each WebHistoryItem is a snapshot of the requested history item.
 class WebHistoryItem {
+  ///Original url of this history item.
   String originalUrl;
+  ///Document title of this history item.
   String title;
+  ///Url of this history item.
   String url;
+  ///0-based position index in the back-forward [WebHistory.list].
+  int index;
+  ///Position offset respect to the currentIndex of the back-forward [WebHistory.list].
+  int offset;
 
-  WebHistoryItem(this.originalUrl, this.title, this.url);
+  WebHistoryItem(this.originalUrl, this.title, this.url, this.index, this.offset);
 }
 
 ///InAppLocalhostServer class.