87 lines
3.1 KiB
TypeScript
87 lines
3.1 KiB
TypeScript
import React from "react";
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type StateArgs = {done?:boolean, open?:boolean};
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type StateObj = {done:boolean, open:boolean};
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type StateBinding = [state:StateObj, update:(args:StateArgs)=>void];
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const CTX = React.createContext([{done:true, open:false}, (args)=>{}] as StateBinding);
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export const Group =(props:{children:React.JSX.Element|React.JSX.Element[]})=>
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{
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const [stateGet, stateSet] = React.useState({done:true, open:false} as StateObj);
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return <CTX.Provider value={[stateGet, (args:StateArgs)=> stateSet({...stateGet, ...args})]}>{props.children}</CTX.Provider>;
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};
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export const Menu =(props:{children:React.JSX.Element|React.JSX.Element[]})=>
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{
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const [stateGet, stateSet] = React.useContext(CTX);
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const refElement:React.MutableRefObject<HTMLElement|null> = React.useRef( null );
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const refControl:React.MutableRefObject<CollapseControls|null> = React.useRef( null );
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React.useEffect(()=>refControl.current = Collapser(refElement.current as HTMLElement, true), []);
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React.useEffect(()=> {refControl.current && refControl.current(stateGet.open, 1000, ()=>stateSet({done:true}))}, [stateGet.open])
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return <div ref={refElement as React.Ref<HTMLDivElement>}>{props.children}</div>;
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};
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export const Button =()=>
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{
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const [stateGet, stateSet] = React.useContext(CTX);
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return <>
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<p>{JSON.stringify(stateGet)}</p>
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<button class="px-10 py-2 bg-red-500 text-white" onClick={e=>stateSet({open:true, done:false})}>Open</button>
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<button class="px-10 py-2 bg-red-500 text-white" onClick={e=>stateSet({open:false, done:false})}>Close</button>
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</>;
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};
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type DoneCallback =(openState:boolean)=>void;
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export 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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return function(inOpen, inMs, inDone)
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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 === true;
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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.transition = `height ${(inMs||1000) / 1000}s`;
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frameRequest = requestAnimationFrame(()=>
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{
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inElement.style.height = `${inOpen ? inElement.scrollHeight : 0}px`;
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});
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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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} |