feat: support boxSizing

Author: OhKanghoon

Sources/Swift/FlexLayout.swift

@@ -1328,7 +1328,20 @@ public final class Flex {
         yoga.display = value.yogaValue
         return self
     }
-    
+
+    //
+    // MARK: Box Sizing
+    //
+  
+    /**
+     Set the box sizing
+     */
+    @discardableResult
+    public func boxSizing(_ value: BoxSizing) -> Flex {
+        yoga.boxSizing = value.yogaValue
+        return self
+    }
+
     // MARK: Enums
 
     /**
@@ -1471,7 +1484,17 @@ public final class Flex {
         /// without influencing the layout of child nodes.
         case contents
     }
-    
+
+    public enum BoxSizing {
+        /// Default value.
+        /// With `borderBox`, the specified dimensions (e.g., width, height) include the content, padding, and border.
+        /// This means the overall size of the element is as defined, with padding and border accounted for inside.
+        case borderBox
+        /// With `contentBox`, the specified dimensions refer only to the content area.
+        /// Padding and borders are added outside these dimensions, potentially increasing the total size of the element.
+        case contentBox
+    }
+
     /*public enum Overflow {
      /// Items that overflow
         case visible

Sources/Swift/Impl/FlexLayout+Enum.swift

@@ -119,6 +119,15 @@ extension Flex.Display {
     }
 }
 
+extension Flex.BoxSizing {
+    var yogaValue: YGBoxSizing {
+        switch self {
+        case .borderBox: return YGBoxSizing.borderBox
+        case .contentBox: return YGBoxSizing.contentBox
+        }
+    }
+}
+
 /*extension Flex.Overflow {
     var yogaValue: YGOverflow {
         switch self {

Sources/YogaKit/YGLayout.mm

@@ -273,6 +273,7 @@ - (void)setPosition:(YGPositionType)position {
 YG_PROPERTY(YGWrap, flexWrap, FlexWrap)
 YG_PROPERTY(YGOverflow, overflow, Overflow)
 YG_PROPERTY(YGDisplay, display, Display)
+YG_PROPERTY(YGBoxSizing, boxSizing, BoxSizing)
 
 YG_PROPERTY(CGFloat, flex, Flex)
 YG_PROPERTY(CGFloat, flexGrow, FlexGrow)

Sources/YogaKit/include/YogaKit/YGLayout.h

@@ -64,6 +64,7 @@ typedef NS_OPTIONS(NSInteger, YGDimensionFlexibility) {
 @property(nonatomic, readwrite, assign) YGWrap flexWrap;
 @property(nonatomic, readwrite, assign) YGOverflow overflow;
 @property(nonatomic, readwrite, assign) YGDisplay display;
+@property(nonatomic, readwrite, assign) YGBoxSizing boxSizing;
 
 @property(nonatomic, readwrite, assign) CGFloat flex;
 @property(nonatomic, readwrite, assign) CGFloat flexGrow;