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use precomputed measurements

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This commit is contained in:
Seth Trowbridge 2023-05-21 22:32:16 -04:00
parent eb64cb95b1
commit cb46a1053d
1 changed files with 38 additions and 32 deletions
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70
example/tree-menu.tsx
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@ -22,8 +22,8 @@ export const Menu =(props:{children:React.JSX.Element|React.JSX.Element[]})=>
const Classes:MenuClassStates =
{
Keep: "relative transition-all border",
Open: "h-auto w-auto top-10 duration-1000",
Shut: "h-0 w-[300px] top-0 duration-1000",
Open: "h-auto w-auto top-10 duration-700",
Shut: "h-0 w-[300px] top-0 duration-300",
Move: "",
Exit: "h-auto w-auto top-36 px-4 opacity-0"
};
@ -61,14 +61,15 @@ export function Collapser(inElement:HTMLElement, initialState = false)
let userDone:DoneCallback = (openState) => {};
let userMode = initialState;
let frameRequest = 0;
let inTransition = false;
let transitions = new Set();
let measurements = false;
const run = (inEvent:TransitionEvent)=>
{
if (inEvent.target == inElement)
{
console.log("transition", inEvent.target)
transitions.add(inEvent.propertyName);
}
};
@ -84,12 +85,28 @@ export function Collapser(inElement:HTMLElement, initialState = false)
{
inElement.setAttribute("style", "");
}
inTransition = false;
userDone(userMode);
}
}
};
const getMeasurements =(inClasses:Record<string, string>)=>
{
inElement.setAttribute("style", `transition: none;`);
const initialClasses = inElement.getAttribute("class")||"";
const output = {} as Record<string, {width:number, height:number}>;
Object.entries(inClasses).forEach(([key, value])=>
{
inElement.setAttribute("class", value);
output[key] = { width: inElement.clientWidth, height: inElement.clientHeight };
});
inElement.removeAttribute("style");
inElement.setAttribute("class", initialClasses);
return output;
};
inElement.addEventListener("transitionend", end);
inElement.addEventListener("transitionrun", run);
@ -102,41 +119,30 @@ export function Collapser(inElement:HTMLElement, initialState = false)
userDone = inDone|| ((m)=>{}) as DoneCallback;
userMode = inOpen === true;
// 1) capture current state and possible classes
const h1 = inElement.clientHeight;
const w1 = inElement.clientWidth;
const classesInitial = inElement.getAttribute("class");
const classesKeep = inElement.getAttribute("data-class-keep");
const classesEnd = inElement.getAttribute(`data-class-${inOpen?"open":"shut"}`);
if((inOpen || !measurements) && !inTransition)
{
measurements = getMeasurements({
Open: inElement.getAttribute("data-class-open")||"",
Shut: inElement.getAttribute("data-class-shut")||"",
});
}
else
{
console.log("inbterrupt");
}
// 2) disable transitions to get immediate results
inElement.setAttribute("style", "");
inElement.style.transition = "width none, height none";
// 3) add new classes and capture new height
inElement.className = classesKeep + " " + classesEnd;
const h2 = inElement.clientHeight;
const w2 = inElement.clientWidth;
// 4) put everything back (and turn on overflow hidden)
inElement.style.height = h1+"px";
inElement.style.width = w1+"px";
inElement.style.width = inElement.clientWidth + "px";
inElement.style.height = inElement.clientHeight + "px";
inElement.style.overflow = "hidden";
inElement.className = classesInitial ?? "";
console.log(`BEFORE classes:"${inElement.className}" width:"${w1}" height:"${h1}"`);
inTransition = true;
frameRequest = requestAnimationFrame(()=>
{
inElement.style.transition = "";
frameRequest = requestAnimationFrame(()=>
{
inElement.style.height = `${h2}px`;
inElement.style.width = `${w2}px`;
inElement.className = classesKeep + " " + classesEnd;
console.log(`AFTER classes:"${inElement.className}" width:"${w2}" height:"${h2}"`);
});
const measure = inOpen ? measurements.Open : measurements.Shut;
inElement.style.width = measure.width + "px";
inElement.style.height = measure.height + "px";
inElement.className = inElement.getAttribute("data-class-keep") + " " + inElement.getAttribute(`data-class-${inOpen?"open":"shut"}`);
});
}