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adjustScrollをやっぱり復活させる

This commit is contained in:
tamaina 2023-07-25 03:40:42 +00:00
parent d6e57059e4
commit c265569008
1 changed files with 56 additions and 16 deletions
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64
packages/frontend/src/components/MkPagination.vue
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@ -41,7 +41,7 @@
import { computed, ComputedRef, isRef, nextTick, onActivated, onBeforeUnmount, onDeactivated, onMounted, ref, watch } from 'vue';
import * as misskey from 'misskey-js';
import * as os from '@/os';
import { isBottomVisible, isTopVisible, getScrollContainer, scrollToBottom, scrollToTop, scrollBy } from '@/scripts/scroll';
import { isBottomVisible, isTopVisible, getScrollContainer, scrollToBottom, scrollToTop, scrollBy, scroll, getBodyScrollHeight } from '@/scripts/scroll';
import { useDocumentVisibility } from '@/scripts/use-document-visibility';
import MkButton from '@/components/MkButton.vue';
import { defaultStore } from '@/store';
@ -242,6 +242,54 @@ watch([$$(weakBacked), $$(contentEl)], () => {
})();
});
function preventDefault(ev: Event) {
ev.preventDefault();
}
/**
* アイテムを上に追加した場合に追加分だけスクロールを下にずらす
* @param fn DOM操作(unshiftItemsなど)
*/
async function adjustScroll(fn: () => void): Promise<void> {
if (isWebKit) {
// Safariでは描画が微妙になるので一定程度スクロールするだけ
scrollBy(scrollableElement, { top: TOLERANCE + 4, behavior: 'instant' });
// backedを強制的にtrueにする
backed = true;
await nextTick();
fn();
return await nextTick();
}
await nextTick();
const oldHeight = scrollableElement ? scrollableElement.scrollHeight : getBodyScrollHeight();
const oldScroll = scrollableElement ? scrollableElement.scrollTop : window.scrollY;
// スクロールをやめさせる
try {
// なぜかscrollableElementOrHtmlがundefinedであるというエラーが出る
scrollableElementOrHtml.addEventListener('wheel', preventDefault, { passive: false });
scrollableElementOrHtml.addEventListener('touchmove', preventDefault, { passive: false });
// スクロールを強制的に停止
scroll(scrollableElement, { top: oldScroll, behavior: 'instant' });
} catch (err) {
console.error(err, { scrollableElementOrHtml });
}
fn();
return await nextTick(() => {
try {
const top = oldScroll + ((scrollableElement ? scrollableElement.scrollHeight : getBodyScrollHeight()) - oldHeight);
scroll(scrollableElement, { top, behavior: 'instant' });
// なぜかscrollableElementOrHtmlがundefinedであるというエラーが出る
scrollableElementOrHtml.removeEventListener('wheel', preventDefault);
scrollableElementOrHtml.removeEventListener('touchmove', preventDefault);
} catch (err) {
console.error(err, { scrollableElementOrHtml });
}
return nextTick();
});
}
//#endregion
/**
* 初期化
* scrollAfterInitなどの後処理もあるので、reload関数を使うべき
@ -342,7 +390,7 @@ const fetchMore = async (): Promise<void> => {
if (i === 10) item._shouldInsertAd_ = true;
}
const reverseConcat = (_res) => concatMapWithArray(items.value, _res);
const reverseConcat = (_res) => adjustScroll(() => concatMapWithArray(items.value, _res));
if (res.length === 0) {
if (props.pagination.reversed) {
@ -503,20 +551,12 @@ async function executeQueue() {
const queueArr = Array.from(queue.value.entries());
queue.value = new Map(queueArr.slice(props.pagination.limit));
isPausingUpdateByExecutingQueue.value = true;
if (!backed) {
// スクロールが先頭の場合
// スクロールを進めることでChromeやFirefoxはいい感じにスクロールを調整してくれる
scrollBy(scrollableElement, { top: 24, behavior: 'instant' });
// 一応backedを強制的にtrueにする
backed = true;
await nextTick();
}
await adjustScroll(() => {
unshiftItems(
queueArr.slice(0, props.pagination.limit).map(v => v[1]).reverse(),
Infinity,
);
await nextTick();
});
items.value = new Map([...items.value].slice(0, displayLimit.value));
await nextTick();
isPausingUpdateByExecutingQueue.value = false;