feat(automation): pure UI node model + JSON serializer with unit test

src/slic3r/GUI/Automation/WidgetSerializer.cpp

@@ -0,0 +1,43 @@
+#include "WidgetSerializer.hpp"
+
+namespace Slic3r { namespace GUI { namespace Automation {
+
+static const char* backend_name(BackendKind k) {
+    return k == BackendKind::Wx ? "wx" : "imgui";
+}
+
+nlohmann::json node_to_json(const UiNode& node, bool include_children) {
+    nlohmann::json j;
+    j["backend"] = backend_name(node.backend);
+    j["id"]      = node.id;
+    j["path"]    = node.path;
+    j["class"]   = node.klass;
+    j["label"]   = node.label;
+    j["rect"]    = { {"x", node.rect.x}, {"y", node.rect.y},
+                     {"w", node.rect.w}, {"h", node.rect.h} };
+    j["enabled"] = node.enabled;
+    j["visible"] = node.visible;
+    if (node.has_value)
+        j["value"] = node.value;
+    if (include_children && node.backend == BackendKind::Wx) {
+        nlohmann::json arr = nlohmann::json::array();
+        for (const UiNode& c : node.children)
+            arr.push_back(node_to_json(c, true));
+        j["children"] = std::move(arr);
+    }
+    return j;
+}
+
+nlohmann::json app_state_to_json(const AppState& s) {
+    nlohmann::json j;
+    j["active_tab"]     = s.active_tab;
+    j["project_loaded"] = s.project_loaded;
+    j["slicing"]        = s.slicing;
+    j["slice_progress"] = s.slice_progress;
+    j["foreground"]     = s.foreground;
+    if (s.modal_dialog)
+        j["modal_dialog"] = *s.modal_dialog;
+    return j;
+}
+
+}}} // namespace