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import React, { CSSProperties, JSX, useEffect, useRef, useState } from "react";
import {
VscChevronDown,
VscChevronLeft,
VscChevronRight,
VscChevronUp,
} from "react-icons/vsc";
import { twMerge } from "tailwind-merge";
import { IconButton } from "../shared/buttons/icon-button";
export enum Orientation {
HORIZONTAL = "horizontal",
VERTICAL = "vertical",
}
enum Collapse {
COLLAPSED = "collapsed",
SPLIT = "split",
FILLED = "filled",
}
type ResizablePanelProps = {
firstChild: React.ReactNode;
firstClassName: string | undefined;
secondChild: React.ReactNode;
secondClassName: string | undefined;
className: string | undefined;
orientation: Orientation;
initialSize: number;
};
export function ResizablePanel({
firstChild,
firstClassName,
secondChild,
secondClassName,
className,
orientation,
initialSize,
}: ResizablePanelProps): JSX.Element {
const [firstSize, setFirstSize] = useState<number>(initialSize);
const [dividerPosition, setDividerPosition] = useState<number | null>(null);
const firstRef = useRef<HTMLDivElement>(null);
const secondRef = useRef<HTMLDivElement>(null);
const [collapse, setCollapse] = useState<Collapse>(Collapse.SPLIT);
const isHorizontal = orientation === Orientation.HORIZONTAL;
useEffect(() => {
if (dividerPosition == null || !firstRef.current) {
return undefined;
}
const getFirstSizeFromEvent = (e: MouseEvent) => {
const position = isHorizontal ? e.clientX : e.clientY;
return firstSize + position - dividerPosition;
};
const onMouseMove = (e: MouseEvent) => {
e.preventDefault();
const newFirstSize = `${getFirstSizeFromEvent(e)}px`;
const { current } = firstRef;
if (current) {
if (isHorizontal) {
current.style.width = newFirstSize;
current.style.minWidth = newFirstSize;
} else {
current.style.height = newFirstSize;
current.style.minHeight = newFirstSize;
}
}
};
const onMouseUp = (e: MouseEvent) => {
e.preventDefault();
if (firstRef.current) {
firstRef.current.style.transition = "";
}
if (secondRef.current) {
secondRef.current.style.transition = "";
}
setFirstSize(getFirstSizeFromEvent(e));
setDividerPosition(null);
document.removeEventListener("mousemove", onMouseMove);
document.removeEventListener("mouseup", onMouseUp);
};
document.addEventListener("mousemove", onMouseMove);
document.addEventListener("mouseup", onMouseUp);
return () => {
document.removeEventListener("mousemove", onMouseMove);
document.removeEventListener("mouseup", onMouseUp);
};
}, [dividerPosition, firstSize, orientation]);
const onMouseDown = (e: React.MouseEvent) => {
e.preventDefault();
if (firstRef.current) {
firstRef.current.style.transition = "none";
}
if (secondRef.current) {
secondRef.current.style.transition = "none";
}
const position = isHorizontal ? e.clientX : e.clientY;
setDividerPosition(position);
};
const getStyleForFirst = () => {
const style: CSSProperties = { overflow: "hidden" };
if (collapse === Collapse.COLLAPSED) {
style.opacity = 0;
style.width = 0;
style.minWidth = 0;
style.height = 0;
style.minHeight = 0;
} else if (collapse === Collapse.SPLIT) {
const firstSizePx = `${firstSize}px`;
if (isHorizontal) {
style.width = firstSizePx;
style.minWidth = firstSizePx;
} else {
style.height = firstSizePx;
style.minHeight = firstSizePx;
}
} else {
style.flexGrow = 1;
}
return style;
};
const getStyleForSecond = () => {
const style: CSSProperties = { overflow: "hidden" };
if (collapse === Collapse.FILLED) {
style.opacity = 0;
style.width = 0;
style.minWidth = 0;
style.height = 0;
style.minHeight = 0;
} else if (collapse === Collapse.SPLIT) {
style.flexGrow = 1;
} else {
style.flexGrow = 1;
}
return style;
};
const onCollapse = () => {
if (collapse === Collapse.SPLIT) {
setCollapse(Collapse.COLLAPSED);
} else {
setCollapse(Collapse.SPLIT);
}
};
const onExpand = () => {
if (collapse === Collapse.SPLIT) {
setCollapse(Collapse.FILLED);
} else {
setCollapse(Collapse.SPLIT);
}
};
return (
<div className={twMerge("flex", !isHorizontal && "flex-col", className)}>
<div
ref={firstRef}
className={twMerge(firstClassName, "transition-all ease-soft-spring")}
style={getStyleForFirst()}
>
{firstChild}
</div>
<div
className={`${isHorizontal ? "cursor-ew-resize w-3 flex-col" : "cursor-ns-resize h-3 flex-row"} shrink-0 flex justify-center items-center`}
onMouseDown={collapse === Collapse.SPLIT ? onMouseDown : undefined}
>
<IconButton
icon={isHorizontal ? <VscChevronLeft /> : <VscChevronUp />}
ariaLabel="Collapse"
onClick={onCollapse}
/>
<IconButton
icon={isHorizontal ? <VscChevronRight /> : <VscChevronDown />}
ariaLabel="Expand"
onClick={onExpand}
/>
</div>
<div
ref={secondRef}
className={twMerge(secondClassName, "transition-all ease-soft-spring")}
style={getStyleForSecond()}
>
{secondChild}
</div>
</div>
);
}
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