libui: Add Rect::contains(Rect)

libui/include/ui/Rect.h

@@ -21,6 +21,15 @@ namespace ui
          */
         bool contains(Point point);
 
+        /**
+         * @brief Check if another rectangle is contained in this one.
+         *
+         * @param point The rectangle to check.
+         * @return true The other rectangle is contained inside this one.
+         * @return false The other rectangle is not contained inside this one.
+         */
+        bool contains(Rect rect);
+
         /**
          * @brief Normalize a point to fit inside this rectangle.
          *

libui/src/Rect.cpp

@@ -8,6 +8,15 @@ namespace ui
                (point.y <= (pos.y + height));
     }
 
+    bool Rect::contains(Rect rect)
+    {
+        if (!contains(rect.pos)) return false;
+        Point rel = relative(rect.pos);
+        if ((rel.x + rect.width) > width) return false;
+        if ((rel.y + rect.height) > height) return false;
+        return true;
+    }
+
     Point Rect::normalize(Point point)
     {
         if (point.x < pos.x) point.x = pos.x;