Dropdown on training view

src/components/Dropdown.tsx

@@ -0,0 +1,84 @@
+import React, { useState, ReactNode, useRef, useEffect } from 'react';
+import { animated, useSpring } from '@react-spring/web';
+
+interface DropdownProps {
+    title: string;
+    open?: boolean;
+    className?: string;
+    contentWrapperClassName?: string;
+    bottomPadding?: number;
+    children: ReactNode;
+}
+
+const Dropdown: React.FC<DropdownProps> = ({
+    title,
+    open = false,
+    className = "w-full text-left font-semibold flex justify-between items-center p-4",
+    contentWrapperClassName = "px-6",
+    bottomPadding = 12,
+    children
+}) => {
+    const [isOpen, setIsOpen] = useState<boolean>(open);
+    const contentRef = useRef<HTMLDivElement>(null);
+    const [contentHeight, setContentHeight] = useState<number>(0);
+
+    useEffect(() => {
+        let resizeObserver: ResizeObserver | null = null;
+        
+        if (contentRef.current) {
+            resizeObserver = new ResizeObserver(entries => {
+                for (let entry of entries) {
+                    if (entry.borderBoxSize && entry.borderBoxSize.length > 0) {
+                        const height = entry.borderBoxSize[0].blockSize;
+                        setContentHeight(height + bottomPadding);
+                    } else {
+                        // Fallback for browsers that don't support borderBoxSize
+                        const height = entry.contentRect.height;
+                        setContentHeight(height + bottomPadding);
+                    }
+                }
+            });
+    
+            resizeObserver.observe(contentRef.current);
+        }
+    
+        return () => {
+            if (resizeObserver) {
+                resizeObserver.disconnect();
+            }
+        };
+    }, [bottomPadding]);
+
+    const springProps = useSpring({
+        height: isOpen ? contentHeight : 0,
+        opacity: isOpen ? 1 : 0,
+        config: { tension: 300, friction: 30 }
+    });
+
+    return (
+        <>
+            <button
+                onClick={() => setIsOpen(!isOpen)}
+                className={className}
+            >
+                {title}
+                <svg
+                    className={`w-4 h-4 transform transition-transform ${isOpen ? 'rotate-180' : ''}`}
+                    fill="none"
+                    stroke="currentColor"
+                    viewBox="0 0 24 24"
+                    xmlns="http://www.w3.org/2000/svg"
+                >
+                    <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M19 9l-7 7-7-7" />
+                </svg>
+            </button>
+            <animated.div style={springProps} className="overflow-hidden">
+                <div ref={contentRef} className={contentWrapperClassName} style={{paddingBottom: bottomPadding}}>
+                    {children}
+                </div>
+            </animated.div>
+        </>
+    );
+};
+
+export default Dropdown;