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Granular updates in $for

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natxocc
2026-04-01 09:01:21 +02:00
parent 1107b1e929
commit 022d75e262
3 changed files with 54 additions and 38 deletions
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41
dist/sigpro.js vendored
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@@ -316,32 +316,39 @@
return container;
};
$if.not = (condition, thenVal, otherwiseVal) => $if(() => !(typeof condition === "function" ? condition() : condition), thenVal, otherwiseVal);
var $for = (source, render, keyFn = (item, index) => index) => {
var $for = (source, render, keyFn) => {
const marker = document.createTextNode("");
const container = $html("div", { style: "display:contents" }, [marker]);
const cache = new Map;
let cache = new Map;
$watch(() => {
const items = (typeof source === "function" ? source() : source) || [];
const newKeys = new Set;
items.forEach((item, index) => {
const key = keyFn(item, index);
newKeys.add(key);
const newCache = new Map;
const newOrder = [];
for (let i = 0;i < items.length; i++) {
const item = items[i];
const key = keyFn ? keyFn(item, i) : i;
let run = cache.get(key);
if (!run) {
run = _view(() => render(item, index));
cache.set(key, run);
}
container.insertBefore(run.container, marker);
});
cache.forEach((run, key) => {
if (!newKeys.has(key)) {
run.destroy();
if (run.container && run.container.parentNode) {
run.container.remove();
}
run = _view(() => render(item, i));
} else {
cache.delete(key);
}
newCache.set(key, run);
newOrder.push(key);
}
cache.forEach((run) => {
run.destroy();
run.container.remove();
});
let anchor = marker;
for (let i = newOrder.length - 1;i >= 0; i--) {
const run = newCache.get(newOrder[i]);
if (run.container.nextSibling !== anchor) {
container.insertBefore(run.container, anchor);
}
anchor = run.container;
}
cache = newCache;
});
return container;
};

2
dist/sigpro.min.js vendored
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File diff suppressed because one or more lines are too long

47
sigpro/index.js
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@@ -307,37 +307,46 @@ $if.not = (condition, thenVal, otherwiseVal) => $if(() => !(typeof condition ===
* @returns {HTMLElement} A reactive container (display: contents).
*/
const $for = (source, render, keyFn = (item, index) => index) => {
const $for = (source, render, keyFn) => {
const marker = document.createTextNode("");
const container = $html("div", { style: "display:contents" }, [marker]);
const cache = new Map();
let cache = new Map();
$watch(() => {
const items = (typeof source === "function" ? source() : source) || [];
const newKeys = new Set();
const newCache = new Map();
const newOrder = [];
items.forEach((item, index) => {
const key = keyFn(item, index);
newKeys.add(key);
for (let i = 0; i < items.length; i++) {
const item = items[i];
const key = keyFn ? keyFn(item, i) : i;
let run = cache.get(key);
if (!run) {
run = _view(() => render(item, index));
cache.set(key, run);
}
container.insertBefore(run.container, marker);
});
cache.forEach((run, key) => {
if (!newKeys.has(key)) {
run.destroy();
if (run.container && run.container.parentNode) {
run.container.remove();
}
run = _view(() => render(item, i));
} else {
cache.delete(key);
}
newCache.set(key, run);
newOrder.push(key);
}
cache.forEach(run => {
run.destroy();
run.container.remove();
});
let anchor = marker;
for (let i = newOrder.length - 1; i >= 0; i--) {
const run = newCache.get(newOrder[i]);
if (run.container.nextSibling !== anchor) {
container.insertBefore(run.container, anchor);
}
anchor = run.container;
}
cache = newCache;
});
return container;