get webview dom size

server/src/utils/webview_utils.cpp

@@ -1,6 +1,9 @@
 #include "webview_utils.h"
 #include "spdlog/spdlog.h"
 #include "utils/common_utils.h"
+#include <boost/json.hpp>
+
+namespace json = boost::json;
 
 void MeasureDomUpdateTime(ComPtr<ICoreWebView2> webview)
 {
@@ -16,4 +19,62 @@ void MeasureDomUpdateTime(ComPtr<ICoreWebView2> webview)
     auto duration = std::chrono::duration_cast<std::chrono::microseconds>(end - start);
     std::wstring message = L"DOM update time: " + std::to_wstring(duration.count()) + L" μs";
     spdlog::info(wstring_to_string(message));
+}
+
+std::pair<double, double> ParseDivSize(const std::wstring &jsonResult)
+{
+    std::string jsonStr = wstring_to_string(jsonResult);
+#ifdef FANY_DEBUG
+    spdlog::info("Div size: {}", jsonStr);
+#endif
+    auto size = std::make_pair(0.0, 0.0);
+    try
+    {
+        json::value parsed = json::parse(jsonStr);
+        if (parsed.is_string())
+        {
+            parsed = json::parse(parsed.as_string());
+        }
+        double width = parsed.at("width").is_int64()           //
+                           ? parsed.at("width").as_int64()     //
+                           : parsed.at("width").as_double();   //
+        double height = parsed.at("height").is_int64()         //
+                            ? parsed.at("height").as_int64()   //
+                            : parsed.at("height").as_double(); //
+        size = std::make_pair(width, height);
+    }
+    catch (const std::exception &e)
+    {
+#ifdef FANY_DEBUG
+        spdlog::error("Failed to parse JSON: {}", e.what());
+#endif
+    }
+    return size;
+}
+
+void GetContainerSize(ComPtr<ICoreWebView2> webview, std::function<void(std::pair<double, double>)> callback)
+{
+    std::wstring script = LR"(
+        (function() {
+            var rect = document.querySelector("#container").getBoundingClientRect();
+            return JSON.stringify({width: rect.width, height: rect.height});
+        })();
+    )";
+    webview->ExecuteScript( //
+        script.c_str(),     //
+        Callback<ICoreWebView2ExecuteScriptCompletedHandler>([callback](HRESULT errorCode, LPCWSTR result) -> HRESULT {
+            std::pair<double, double> size;
+            if (SUCCEEDED(errorCode) && result)
+            {
+                size = ParseDivSize(result);
+            }
+            else
+            {
+#ifdef FANY_DEBUG
+                spdlog::error("Failed to get container size.");
+#endif
+            }
+            callback(size);
+            return S_OK;
+        }).Get());
 }