87 lines
2.5 KiB
TypeScript
87 lines
2.5 KiB
TypeScript
import React from "react";
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export default (props:{open:boolean, children:React.JSX.Element|React.JSX.Element[]})=>
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{
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const [openGet, openSet] = React.useState(props.open);
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const [doneGet, doneSet] = React.useState(true);
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const refEl:React.RefObject<HTMLElement> = React.useRef(null);
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const refCollapse:React.RefObject<CollapseControls> = React.useRef(null);
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React.useEffect(()=>
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{
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if(refEl.current)
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{
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refCollapse.current = Collapser(refEl.current, openGet);
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}
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return ()=> refCollapse.current && refCollapse.current();
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}
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, []);
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const Handler =()=>
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{
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openSet((old)=>
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{
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if(refCollapse.current)
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{
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doneSet(false);
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refCollapse.current(!old, 1000, ()=>doneSet(true));
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}
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return !old;
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});
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};
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return <div>
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<button onClick={Handler}>{openGet ? "Close this" : "Open it"}{doneGet ? "." : "..."}</button>
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<div ref={refEl as React.RefObject<HTMLDivElement>}>
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{!(!openGet && doneGet) && props.children}
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</div>
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</div>
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};
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type DoneCallback =(openState:boolean)=>void;
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type CollapseControls =(inOpen?:boolean, inMs?:number, inDone?:DoneCallback)=>void;
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export function Collapser(inElement:HTMLElement, initialState = false)
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{
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let userDone:DoneCallback = (openState) => {};
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let userMode = initialState;
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let frameRequest = 0;
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const done = (inEvent:TransitionEvent)=>
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{
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if (inEvent.propertyName == "height" && inEvent.target == inElement)
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{
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inEvent.stopPropagation();
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if (userMode)
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{
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inElement.style.height = "auto";
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inElement.style.overflow = "visible";
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}
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userDone(userMode);
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}
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};
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inElement.addEventListener("transitionend", done);
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/** @type Toggler */
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return function(inOpen?:boolean, inMs?:number, inDone?:DoneCallback)
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{
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cancelAnimationFrame(frameRequest);
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if(arguments.length)
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{
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userDone = inDone|| ((m)=>{}) as DoneCallback;
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userMode = inOpen||!userMode;
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inElement.style.height = inElement.clientHeight + "px";
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inElement.style.overflow = "hidden";
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inElement.style.transition = "none";
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frameRequest = requestAnimationFrame(()=>
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{
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inElement.style.height = `${inOpen ? inElement.scrollHeight : 0}px`;
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inElement.style.transition = `height ${(inMs||1000) / 1000}s`;
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});
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}
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else
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{
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inElement.removeEventListener("transitionend", done);
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}
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} as CollapseControls;
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} |