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import React, { useState, useRef, useEffect } from 'react';
import { cn } from '@/lib/core';
import { Button } from '@/components/ui/Button';
import { DropdownProps, DropdownItem } from '@/types/ui';
import { Icon } from '@/components/ui/icons';
/**
* Dropdown Component
*
* An accessible dropdown menu with keyboard navigation.
*
* @example
* ```tsx
* const items = [
* { label: 'Edit', value: 'edit', icon: <Icon name="edit" /> },
* { label: 'Delete', value: 'delete', icon: <Icon name="trash" /> },
* ];
*
* <Dropdown
* items={items}
* onChange={(value) => console.log(value)}
* placeholder="Select action"
* />
* ```
*/
export const Dropdown: React.FC<DropdownProps> = ({
items,
value,
onChange,
placeholder = 'Select...',
size = 'md',
fullWidth,
disabled,
trigger}) => {
const [isOpen, setIsOpen] = useState(false);
const dropdownRef = useRef<HTMLDivElement>(null);
const selectedItem = items.find((item) => item.value === value);
// Close on outside click
useEffect(() => {
const handleClickOutside = (event: MouseEvent) => {
if (dropdownRef.current && !dropdownRef.current.contains(event.target as Node)) {
setIsOpen(false);
}
};
if (isOpen) {
document.addEventListener('mousedown', handleClickOutside);
}
return () => {
document.removeEventListener('mousedown', handleClickOutside);
};
}, [isOpen]);
// Handle escape key
useEffect(() => {
const handleEscape = (event: KeyboardEvent) => {
if (event.key === 'Escape') {
setIsOpen(false);
}
};
if (isOpen) {
document.addEventListener('keydown', handleEscape);
}
return () => {
document.removeEventListener('keydown', handleEscape);
};
}, [isOpen]);
const handleItemClick = (item: DropdownItem) => {
if (item.disabled) return;
onChange?.(item.value);
setIsOpen(false);
};
const sizeStyles = {
sm: 'px-3 py-1.5 text-sm',
md: 'px-4 py-2 text-base',
lg: 'px-5 py-3 text-lg'};
return (
<div
ref={dropdownRef}
className={cn('relative', fullWidth && 'w-full')}
>
{/* Trigger */}
{trigger ? (
<div onClick={() => !disabled && setIsOpen(!isOpen)}>
{trigger}
</div>
) : (
<Button
type="button"
onClick={() => setIsOpen(!isOpen)}
disabled={disabled}
variant="ghost"
className={cn(
'flex items-center justify-between gap-2 w-full',
'bg-white dark:bg-gray-700 border border-gray-300 dark:border-gray-600 rounded-lg',
'hover:border-gray-400 dark:hover:border-gray-500 focus:outline-none focus:ring-2 focus:ring-blue/20',
'transition-all duration-200',
'disabled:opacity-50 disabled:cursor-not-allowed',
sizeStyles[size]
)}
aria-haspopup="listbox"
aria-expanded={isOpen}
>
<span className="flex items-center gap-2">
{selectedItem?.icon}
<span className={!selectedItem ? 'text-gray-400 dark:text-gray-500' : 'dark:text-gray-100'}>
{selectedItem?.label || placeholder}
</span>
</span>
<Icon
name="chevron-down"
size={16}
className={cn('transition-transform', isOpen && 'rotate-180')}
/>
</Button>
)}
{/* Dropdown Menu */}
{isOpen && (
<div
className={cn(
'absolute z-10 mt-1 w-full',
'bg-white dark:bg-gray-800 border border-gray-200 dark:border-gray-700 rounded-lg shadow-lg',
'max-h-60 overflow-auto',
'animate-fadeIn'
)}
role="listbox"
>
{items.map((item) => (
<Button
key={item.value}
type="button"
onClick={() => handleItemClick(item)}
disabled={item.disabled}
variant="ghost"
className={cn(
'flex items-center gap-2 w-full px-4 py-2 text-left dark:text-gray-100',
'hover:bg-gray-100 dark:hover:bg-gray-700 transition-colors',
'disabled:opacity-50 disabled:cursor-not-allowed',
value === item.value && 'bg-blue-50 dark:bg-blue-900/30 text-blue-600 dark:text-blue-400'
)}
role="option"
aria-selected={value === item.value}
>
{item.icon}
<span>{item.label}</span>
</Button>
))}
</div>
)}
</div>
);
};
export default Dropdown;
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