initial commit; cv 0.0.3

Api/HorizontalBoxSlot.hpp

@@ -0,0 +1,52 @@
+#pragma once
+
+#include "PanelSlot.hpp"
+
+namespace PalUIExtension::Api
+{
+    // Same four-member surface as VerticalBoxSlot (Size + Padding + H/V
+    // alignment). Different engine class, different ClassPath -- kept
+    // separate rather than shared, matching how CanvasPanelSlot,
+    // SizeBoxSlot, and OverlaySlot each stand alone in this tree despite
+    // overlapping surfaces.
+    class HorizontalBoxSlot : public PanelSlot
+    {
+    public:
+        static auto ClassPath() -> const TCHAR* { return STR("/Script/UMG.HorizontalBoxSlot"); }
+        static auto DebugTag()  -> const TCHAR* { return STR("HorizontalBoxSlot"); }
+
+        HorizontalBoxSlot() = default;
+        explicit HorizontalBoxSlot(UObject* Obj)
+            : PanelSlot(Obj, ClassOf<HorizontalBoxSlot>(), DebugTag()) {}
+
+        // ---- setters (write through the UFUNCTION so SynchronizeProperties runs)
+
+        auto SetSize(FSlateChildSize_ InSize) -> bool
+        {
+            struct P { FSlateChildSize_ InSize; } p{ InSize };
+            return Call(STR("SetSize"), p);
+        }
+        auto SetPadding(FMargin_ InPadding) -> bool
+        {
+            struct P { FMargin_ InPadding; } p{ InPadding };
+            return Call(STR("SetPadding"), p);
+        }
+        auto SetHorizontalAlignment(EHorizontalAlignment_ InHorizontalAlignment) -> bool
+        {
+            struct P { EHorizontalAlignment_ InHorizontalAlignment; } p{ InHorizontalAlignment };
+            return Call(STR("SetHorizontalAlignment"), p);
+        }
+        auto SetVerticalAlignment(EVerticalAlignment_ InVerticalAlignment) -> bool
+        {
+            struct P { EVerticalAlignment_ InVerticalAlignment; } p{ InVerticalAlignment };
+            return Call(STR("SetVerticalAlignment"), p);
+        }
+
+        // ---- property reads
+
+        auto GetSize()                const -> std::optional<FSlateChildSize_>    { return PropertyValue<FSlateChildSize_>(STR("Size")); }
+        auto GetPadding()              const -> std::optional<FMargin_>             { return PropertyValue<FMargin_>(STR("Padding")); }
+        auto GetHorizontalAlignment()  const -> std::optional<EHorizontalAlignment_> { return PropertyValue<EHorizontalAlignment_>(STR("HorizontalAlignment")); }
+        auto GetVerticalAlignment()    const -> std::optional<EVerticalAlignment_>   { return PropertyValue<EVerticalAlignment_>(STR("VerticalAlignment")); }
+    };
+}