windows: added c++ nlohmann.json dependency, added getCopyBackForwardList implementation

flutter_inappwebview_platform_interface/lib/src/in_app_webview/platform_inappwebview_controller.dart

@@ -783,6 +783,7 @@ abstract class PlatformInAppWebViewController extends PlatformInterface
   ///- Android native WebView ([Official API - WebView.copyBackForwardList](https://developer.android.com/reference/android/webkit/WebView#copyBackForwardList()))
   ///- iOS ([Official API - WKWebView.backForwardList](https://developer.apple.com/documentation/webkit/wkwebview/1414977-backforwardlist))
   ///- MacOS ([Official API - WKWebView.backForwardList](https://developer.apple.com/documentation/webkit/wkwebview/1414977-backforwardlist))
+  ///- Windows
   ///{@endtemplate}
   Future<WebHistory?> getCopyBackForwardList() {
     throw UnimplementedError(

flutter_inappwebview_windows/windows/CMakeLists.txt

@@ -6,6 +6,7 @@ cmake_minimum_required(VERSION 3.14)
 
 set(WIL_VERSION "1.0.231216.1")
 set(WEBVIEW_VERSION "1.0.2210.55")
+set(NLOHMANN_JSON "3.11.2")
 
 message(VERBOSE "CMake system version is ${CMAKE_SYSTEM_VERSION} (using SDK ${CMAKE_VS_WINDOWS_TARGET_PLATFORM_VERSION})")
 
@@ -31,6 +32,7 @@ add_custom_command(
   TARGET ${PROJECT_NAME}_DEPENDENCIES_DOWNLOAD PRE_BUILD
   COMMAND ${NUGET} install Microsoft.Windows.ImplementationLibrary -Version ${WIL_VERSION} -ExcludeVersion -OutputDirectory ${CMAKE_BINARY_DIR}/packages
   COMMAND ${NUGET} install Microsoft.Web.WebView2 -Version ${WEBVIEW_VERSION} -ExcludeVersion -OutputDirectory ${CMAKE_BINARY_DIR}/packages
+  COMMAND ${NUGET} install nlohmann.json -Version ${NLOHMANN_JSON} -ExcludeVersion -OutputDirectory ${CMAKE_BINARY_DIR}/packages
   DEPENDS ${NUGET}
 )
 
@@ -54,6 +56,10 @@ list(APPEND PLUGIN_SOURCES
   "types/web_resource_request.h"
   "types/web_resource_response.cpp"
   "types/web_resource_response.h"
+  "types/web_history.cpp"
+  "types/web_history.h"
+  "types/web_history_item.cpp"
+  "types/web_history_item.h"
   "custom_platform_view/custom_platform_view.cc"
   "custom_platform_view/custom_platform_view.h"
   "custom_platform_view/texture_bridge.cc"
@@ -123,6 +129,7 @@ apply_standard_settings(${PLUGIN_NAME})
 
 target_link_libraries(${PLUGIN_NAME} PRIVATE ${CMAKE_BINARY_DIR}/packages/Microsoft.Web.WebView2/build/native/Microsoft.Web.WebView2.targets)
 target_link_libraries(${PLUGIN_NAME} PRIVATE ${CMAKE_BINARY_DIR}/packages/Microsoft.Windows.ImplementationLibrary/build/native/Microsoft.Windows.ImplementationLibrary.targets)
+target_link_libraries(${PLUGIN_NAME} PRIVATE ${CMAKE_BINARY_DIR}/packages/nlohmann.json/build/native/nlohmann.json.targets)
 
 # Symbols are hidden by default to reduce the chance of accidental conflicts
 # between plugins. This should not be removed; any symbols that should be

flutter_inappwebview_windows/windows/in_app_webview/in_app_webview.cpp

@@ -1,4 +1,5 @@
 #include <cstring>
+#include <nlohmann/json.hpp>
 #include <Shlwapi.h>
 #include <WebView2EnvironmentOptions.h>
 #include <wil/wrl.h>
@@ -21,11 +22,15 @@ namespace flutter_inappwebview_plugin
     : plugin(plugin), id(params.id), webViewEnv(std::move(webViewEnv)), webViewController(std::move(webViewController)), webViewCompositionController(std::move(webViewCompositionController)),
     settings(params.initialSettings)
   {
-    this->webViewController->get_CoreWebView2(webView.put());
+    auto hrWebView2 = this->webViewController->get_CoreWebView2(webView.put());
+    if (FAILED(hrWebView2)) {
+      std::cerr << "Cannot create CoreWebView2." << std::endl;
+      debugLog(getErrorMessage(hrWebView2));
+    }
 
     if (this->webViewCompositionController) {
       if (!createSurface(parentWindow, plugin->inAppWebViewManager->compositor())) {
-        std::cerr << "Cannot create InAppWebView surface\n";
+        std::cerr << "Cannot create InAppWebView surface." << std::endl;
       }
       registerSurfaceEventHandlers();
     }
@@ -37,7 +42,8 @@ namespace flutter_inappwebview_plugin
     }
 
     wil::com_ptr<ICoreWebView2Settings> webView2Settings;
-    if (SUCCEEDED(webView->get_Settings(&webView2Settings))) {
+    auto hrWebView2Settings = webView->get_Settings(&webView2Settings);
+    if (SUCCEEDED(hrWebView2Settings)) {
       webView2Settings->put_IsScriptEnabled(settings->javaScriptEnabled);
       webView2Settings->put_IsZoomControlEnabled(settings->supportZoom);
 
@@ -48,6 +54,9 @@ namespace flutter_inappwebview_plugin
         }
       }
     }
+    else {
+      debugLog(getErrorMessage(hrWebView2Settings));
+    }
 
     registerEventHandlers();
   }
@@ -182,7 +191,7 @@ namespace flutter_inappwebview_plugin
 
           UINT64 navigationId;
           if (SUCCEEDED(args->get_NavigationId(&navigationId))) {
-            navigationActions.insert({ navigationId, navigationAction }); callShouldOverrideUrlLoading_ =
+            navigationActions.insert({ navigationId, navigationAction });
           }
 
           if (callShouldOverrideUrlLoading_ && requestMethod == nullptr) {
@@ -363,16 +372,55 @@ namespace flutter_inappwebview_plugin
     webView->Reload();
   }
 
-  void InAppWebView::goBack() const
+  void InAppWebView::goBack()
   {
+    callShouldOverrideUrlLoading_ = false;
     webView->GoBack();
   }
 
-  void InAppWebView::goForward() const
+  void InAppWebView::goForward()
   {
+    callShouldOverrideUrlLoading_ = false;
     webView->GoForward();
   }
 
+  void InAppWebView::getCopyBackForwardList(const std::function<void(std::unique_ptr<WebHistory>)> completionHandler) const
+  {
+    webView->CallDevToolsProtocolMethod(L"Page.getNavigationHistory", L"{}", Callback<ICoreWebView2CallDevToolsProtocolMethodCompletedHandler>(
+      [completionHandler](HRESULT errorCode, LPCWSTR returnObjectAsJson)
+      {
+        if (errorCode == S_OK) {
+          auto historyJson = nlohmann::json::parse(wide_to_ansi(returnObjectAsJson));
+
+          int64_t currentIndex = historyJson.at("currentIndex").is_number_unsigned() ? historyJson.at("currentIndex").get<int64_t>() : 0;
+          auto entries = historyJson.at("entries").is_array() ? historyJson.at("entries").get<std::vector<nlohmann::json>>() : std::vector<nlohmann::json>{};
+
+          std::vector<std::shared_ptr<WebHistoryItem>> webHistoryItems;
+          webHistoryItems.reserve(entries.size());
+          int64_t i = 0;
+          for (auto const& entry : entries) {
+            int64_t offset = i - currentIndex;
+            webHistoryItems.push_back(std::make_shared<WebHistoryItem>(
+              i,
+              offset,
+              entry.at("userTypedURL").is_string() ? entry.at("userTypedURL").get<std::string>() : std::optional<std::string>{},
+              entry.at("title").is_string() ? entry.at("title").get<std::string>() : std::optional<std::string>{},
+              entry.at("url").is_string() ? entry.at("url").get<std::string>() : std::optional<std::string>{}
+            ));
+            i++;
+          }
+
+          completionHandler(std::make_unique<WebHistory>(currentIndex, webHistoryItems));
+        }
+        else {
+          debugLog(getErrorMessage(errorCode));
+        }
+
+        return S_OK;
+      }
+    ).Get());
+  }
+
   void InAppWebView::evaluateJavascript(const std::string& source, std::function<void(std::string)> completionHanlder) const
   {
     webView->ExecuteScript(ansi_to_wide(source).c_str(),

flutter_inappwebview_windows/windows/in_app_webview/in_app_webview.h

@@ -11,6 +11,7 @@
 #include "../flutter_inappwebview_windows_plugin.h"
 #include "../types/navigation_action.h"
 #include "../types/url_request.h"
+#include "../types/web_history.h"
 #include "in_app_webview_settings.h"
 #include "webview_channel_delegate.h"
 
@@ -130,9 +131,10 @@ namespace flutter_inappwebview_plugin
     std::optional<std::string> getTitle() const;
     void loadUrl(const URLRequest& urlRequest) const;
     void reload() const;
-    void goBack() const;
+    void goBack();
-    void goForward() const;
+    void goForward();
     void evaluateJavascript(const std::string& source, std::function<void(std::string)> completionHanlder) const;
+    void getCopyBackForwardList(const std::function<void(std::unique_ptr<WebHistory>)> completionHandler) const;
 
     static bool isSslError(const COREWEBVIEW2_WEB_ERROR_STATUS& webErrorStatus);
   private:

flutter_inappwebview_windows/windows/in_app_webview/webview_channel_delegate.cpp

@@ -46,19 +46,19 @@ namespace flutter_inappwebview_plugin
     else if (method_call.method_name().compare("loadUrl") == 0) {
       auto urlRequest = std::make_unique<URLRequest>(get_fl_map_value<flutter::EncodableMap>(arguments, "urlRequest"));
       webView->loadUrl(*urlRequest);
-      result->Success(make_fl_value(true));
+      result->Success(true);
     }
     else if (method_call.method_name().compare("reload") == 0) {
       webView->reload();
-      result->Success(make_fl_value(true));
+      result->Success(true);
     }
     else if (method_call.method_name().compare("goBack") == 0) {
       webView->goBack();
-      result->Success(make_fl_value(true));
+      result->Success(true);
     }
     else if (method_call.method_name().compare("goForward") == 0) {
       webView->goForward();
-      result->Success(make_fl_value(true));
+      result->Success(true);
     }
     else if (method_call.method_name().compare("evaluateJavascript") == 0) {
       auto result_ = std::shared_ptr<flutter::MethodResult<flutter::EncodableValue>>(std::move(result));
@@ -66,21 +66,28 @@ namespace flutter_inappwebview_plugin
       auto source = get_fl_map_value<std::string>(arguments, "source");
       webView->evaluateJavascript(source, [result_ = std::move(result_)](const std::string& value)
         {
-          result_->Success(make_fl_value(value));
+          result_->Success(value);
+        });
+    }
+    else if (method_call.method_name().compare("getCopyBackForwardList") == 0) {
+      auto result_ = std::shared_ptr<flutter::MethodResult<flutter::EncodableValue>>(std::move(result));
+      webView->getCopyBackForwardList([result_ = std::move(result_)](const std::unique_ptr<WebHistory> value)
+        {
+          result_->Success(value->toEncodableMap());
         });
     }
     // for inAppBrowser
     else if (webView->inAppBrowser && method_call.method_name().compare("show") == 0) {
       webView->inAppBrowser->show();
-      result->Success(make_fl_value(true));
+      result->Success(true);
     }
     else if (webView->inAppBrowser && method_call.method_name().compare("hide") == 0) {
       webView->inAppBrowser->hide();
-      result->Success(make_fl_value(true));
+      result->Success(true);
     }
     else if (webView->inAppBrowser && method_call.method_name().compare("close") == 0) {
       webView->inAppBrowser->close();
-      result->Success(make_fl_value(true));
+      result->Success(true);
     }
     else {
       result->NotImplemented();

flutter_inappwebview_windows/windows/types/web_history.cpp

@@ -0,0 +1,22 @@
+#include "../utils/util.h"
+#include "web_history.h"
+
+namespace flutter_inappwebview_plugin
+{
+  WebHistory::WebHistory(const std::optional<int64_t> currentIndex, const std::optional<std::vector<std::shared_ptr<WebHistoryItem>>>& list)
+    : currentIndex(currentIndex), list(list)
+  {}
+
+  WebHistory::WebHistory(const flutter::EncodableMap& map)
+    : currentIndex(get_optional_fl_map_value<int64_t>(map, "currentIndex")),
+    list(functional_map(get_optional_fl_map_value<flutter::EncodableList>(map, "list"), [](const flutter::EncodableValue& m) { return std::make_shared<WebHistoryItem>(std::get<flutter::EncodableMap>(m)); }))
+  {}
+
+  flutter::EncodableMap WebHistory::toEncodableMap() const
+  {
+    return flutter::EncodableMap{
+      {"currentIndex", make_fl_value(currentIndex)},
+      {"list", make_fl_value(functional_map(list, [](const std::shared_ptr<WebHistoryItem>& item) { return item->toEncodableMap(); }))}
+    };
+  }
+}

flutter_inappwebview_windows/windows/types/web_history.h

@@ -0,0 +1,26 @@
+#ifndef FLUTTER_INAPPWEBVIEW_PLUGIN_WEB_HISTORY_H_
+#define FLUTTER_INAPPWEBVIEW_PLUGIN_WEB_HISTORY_H_
+
+#include <flutter/standard_method_codec.h>
+#include <optional>
+
+#include "../utils/flutter.h"
+#include "web_history_item.h"
+
+namespace flutter_inappwebview_plugin
+{
+  class WebHistory
+  {
+  public:
+    const std::optional<int64_t> currentIndex;
+    const std::optional<std::vector<std::shared_ptr<WebHistoryItem>>> list;
+
+    WebHistory(const std::optional<int64_t> currentIndex, const std::optional<std::vector<std::shared_ptr<WebHistoryItem>>>& list);
+    WebHistory(const flutter::EncodableMap& map);
+    ~WebHistory() = default;
+
+    flutter::EncodableMap toEncodableMap() const;
+  };
+}
+
+#endif //FLUTTER_INAPPWEBVIEW_PLUGIN_WEB_HISTORY_H_

flutter_inappwebview_windows/windows/types/web_history_item.cpp

@@ -0,0 +1,29 @@
+#include "web_history_item.h"
+
+namespace flutter_inappwebview_plugin
+{
+  WebHistoryItem::WebHistoryItem(const std::optional<int64_t>& index, const std::optional<int64_t>& offset,
+    const std::optional<std::string>& originalUrl, const std::optional<std::string>& title,
+    const std::optional<std::string>& url)
+    : index(index), offset(offset), originalUrl(originalUrl), title(title), url(url)
+  {}
+
+  WebHistoryItem::WebHistoryItem(const flutter::EncodableMap& map)
+    : index(get_optional_fl_map_value<int64_t>(map, "index")),
+    offset(get_optional_fl_map_value<int64_t>(map, "offset")),
+    originalUrl(get_optional_fl_map_value<std::string>(map, "originalUrl")),
+    title(get_optional_fl_map_value<std::string>(map, "title")),
+    url(get_optional_fl_map_value<std::string>(map, "url"))
+  {}
+
+  flutter::EncodableMap WebHistoryItem::toEncodableMap() const
+  {
+    return flutter::EncodableMap{
+      {"index", make_fl_value(index)},
+      {"offset", make_fl_value(offset)},
+      {"originalUrl", make_fl_value(originalUrl)},
+      {"title", make_fl_value(title)},
+      {"url", make_fl_value(url)}
+    };
+  }
+}

flutter_inappwebview_windows/windows/types/web_history_item.h

@@ -0,0 +1,30 @@
+#ifndef FLUTTER_INAPPWEBVIEW_PLUGIN_WEB_HISTORY_ITEM_H_
+#define FLUTTER_INAPPWEBVIEW_PLUGIN_WEB_HISTORY_ITEM_H_
+
+#include <flutter/standard_method_codec.h>
+#include <optional>
+
+#include "../utils/flutter.h"
+
+namespace flutter_inappwebview_plugin
+{
+  class WebHistoryItem
+  {
+  public:
+    const std::optional<int64_t> index;
+    const std::optional<int64_t> offset;
+    const std::optional<std::string> originalUrl;
+    const std::optional<std::string> title;
+    const std::optional<std::string> url;
+
+    WebHistoryItem(const std::optional<int64_t>& index, const std::optional<int64_t>& offset,
+      const std::optional<std::string>& originalUrl, const std::optional<std::string>& title,
+      const std::optional<std::string>& url);
+    WebHistoryItem(const flutter::EncodableMap& map);
+    ~WebHistoryItem() = default;
+
+    flutter::EncodableMap toEncodableMap() const;
+  };
+}
+
+#endif //FLUTTER_INAPPWEBVIEW_PLUGIN_WEB_HISTORY_ITEM_H_

flutter_inappwebview_windows/windows/utils/util.h

@@ -87,6 +87,39 @@ namespace flutter_inappwebview_plugin
     auto itr = map.find(key);
     return itr != map.end() ? itr->second : nullptr;
   }
+
+  template <typename Iterator, typename Func>
+  static inline auto functional_map(Iterator begin, Iterator end, Func&& func) ->
+    std::vector<decltype(func(std::declval<typename Iterator::value_type>()))>
+  {
+    using value_type = decltype(func(std::declval<typename Iterator::value_type>()));
+
+    std::vector<value_type> out_vector;
+    out_vector.reserve(std::distance(begin, end));
+
+    std::transform(begin, end, std::back_inserter(out_vector),
+      std::forward<Func>(func));
+
+    return out_vector;
+  }
+
+  template <typename T, typename Func>
+  static inline auto functional_map(const T& iterable, Func&& func) ->
+    std::vector<decltype(func(std::declval<typename T::value_type>()))>
+  {
+    return functional_map(std::begin(iterable), std::end(iterable),
+      std::forward<Func>(func));
+  }
+
+  template <typename T, typename Func>
+  static inline auto functional_map(const std::optional<T>& iterable, Func&& func) ->
+    std::vector<decltype(func(std::declval<typename T::value_type>()))>
+  {
+    if (!iterable.has_value()) {
+      return {};
+    }
+    return functional_map(iterable.value(), std::forward<Func>(func));
+  }
 }
 
 #endif //FLUTTER_INAPPWEBVIEW_PLUGIN_UTIL_H_