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import React, { useCallback } from "react";
import { useCombobox } from "downshift";
import styled from "styled-components";
import {
buttonColor,
defaultBorderRadius,
secondaryDark,
vscBackground,
} from ".";
const mainInputFontSize = 16;
const MainTextInput = styled.input`
padding: 8px;
font-size: ${mainInputFontSize}px;
border-radius: ${defaultBorderRadius};
border: 1px solid #ccc;
margin: 8px auto;
width: 100%;
background-color: ${vscBackground};
color: white;
outline: 1px solid orange;
`;
const UlMaxHeight = 200;
const Ul = styled.ul<{
hidden: boolean;
showAbove: boolean;
ulHeightPixels: number;
}>`
${(props) =>
props.showAbove
? `transform: translateY(-${props.ulHeightPixels + 8}px);`
: `transform: translateY(${2 * mainInputFontSize}px);`}
position: absolute;
background: ${vscBackground};
background-color: ${secondaryDark};
color: white;
font-family: "Fira Code", monospace;
max-height: ${UlMaxHeight}px;
overflow: scroll;
padding: 0;
${({ hidden }) => hidden && "display: none;"}
border-radius: ${defaultBorderRadius};
overflow: hidden;
border: 0.5px solid gray;
`;
const Li = styled.li<{
highlighted: boolean;
selected: boolean;
isLastItem: boolean;
}>`
${({ highlighted }) => highlighted && "background: #aa0000;"}
${({ selected }) => selected && "font-weight: bold;"}
padding: 0.5rem 0.75rem;
display: flex;
flex-direction: column;
${({ isLastItem }) => isLastItem && "border-bottom: 1px solid gray;"}
border-top: 1px solid gray;
cursor: pointer;
`;
interface ComboBoxProps {
items: { name: string; description: string }[];
onInputValueChange: (inputValue: string) => void;
disabled?: boolean;
onEnter?: (e: React.KeyboardEvent<HTMLInputElement>) => void;
}
const ComboBox = React.forwardRef((props: ComboBoxProps, ref) => {
const [items, setItems] = React.useState(props.items);
const {
isOpen,
getToggleButtonProps,
getLabelProps,
getMenuProps,
getInputProps,
highlightedIndex,
getItemProps,
selectedItem,
setInputValue,
} = useCombobox({
onInputValueChange({ inputValue }) {
if (!inputValue) return;
props.onInputValueChange(inputValue);
setItems(
props.items.filter((item) =>
item.name.toLowerCase().startsWith(inputValue.toLowerCase())
)
);
},
items,
itemToString(item) {
return item ? item.name : "";
},
});
const divRef = React.useRef<HTMLDivElement>(null);
const ulRef = React.useRef<HTMLUListElement>(null);
const showAbove = () => {
return (divRef.current?.getBoundingClientRect().top || 0) > UlMaxHeight;
};
return (
<div className="flex px-2" ref={divRef} hidden={!isOpen}>
<MainTextInput
disabled={props.disabled}
placeholder="Type '/' to see the list of available slash commands..."
{...getInputProps({
onKeyDown: (event) => {
if (event.key === "Enter" && (!isOpen || items.length === 0)) {
// Prevent Downshift's default 'Enter' behavior.
(event.nativeEvent as any).preventDownshiftDefault = true;
if (props.onEnter) props.onEnter(event);
setInputValue("");
}
},
ref: ref as any,
})}
/>
<Ul
{...getMenuProps({
ref: ulRef,
})}
showAbove={showAbove()}
ulHeightPixels={ulRef.current?.getBoundingClientRect().height || 0}
>
{isOpen &&
items.map((item, index) => (
<Li
key={`${item.name}${index}`}
{...getItemProps({ item, index })}
highlighted={highlightedIndex === index}
selected={selectedItem === item}
>
<span>
{item.name}: {item.description}
</span>
</Li>
))}
</Ul>
</div>
);
});
export default ComboBox;
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