minor refactor Button

src/graphics/ui/elements/Panel.cpp

@@ -27,6 +27,17 @@ int Panel::getMinLength() const {
     return minLength;
 }
 
+void Panel::setContentSize(const glm::ivec2& contentSize) {
+    setSize(glm::vec2(
+        glm::max(padding.x + padding.z + contentSize.x, size.x),
+        glm::max(padding.y + padding.w + contentSize.y, size.y)
+    ));
+}
+
+glm::vec2 Panel::getContentSize() const {
+    return size - glm::vec2(padding.z + padding.x, padding.w + padding.y);
+}
+
 void Panel::cropToContent() {
     if (maxLength > 0.0f) {
         setSize(glm::vec2(