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misskey/src/client/scripts/paging.ts

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import Vue from 'vue';
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function getScrollContainer(el: Element | null): Element | null {
if (el == null || el.tagName === 'BODY') return null;
const style = window.getComputedStyle(el);
if (style.getPropertyValue('overflow') === 'auto') {
return el;
} else {
return getScrollContainer(el.parentElement);
}
}
function getScrollPosition(el: Element | null): number {
const container = getScrollContainer(el);
return container == null ? window.scrollY : container.scrollTop;
}
function onScrollTop(el, cb) {
const container = getScrollContainer(el) || window;
const onScroll = ev => {
if (!document.body.contains(el)) return;
const pos = getScrollPosition(el);
if (pos === 0) {
cb();
container.removeEventListener('scroll', onscroll);
}
};
container.addEventListener('scroll', onScroll, { passive: true });
}
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export default (opts) => ({
data() {
return {
items: [],
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queue: [],
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offset: 0,
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fetching: true,
moreFetching: false,
inited: false,
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more: false,
backed: false,
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isBackTop: false,
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};
},
computed: {
empty(): boolean {
return this.items.length == 0 && !this.fetching && this.inited;
},
error(): boolean {
return !this.fetching && !this.inited;
},
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},
watch: {
pagination() {
this.init();
}
},
created() {
opts.displayLimit = opts.displayLimit || 30;
this.init();
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this.$on('hook:activated', () => {
this.isBackTop = false;
});
this.$on('hook:deactivated', () => {
this.isBackTop = window.scrollY === 0;
});
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},
methods: {
updateItem(i, item) {
Vue.set((this as any).items, i, item);
},
reload() {
this.items = [];
this.init();
},
async init() {
this.fetching = true;
if (opts.before) opts.before(this);
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let params = typeof this.pagination.params === 'function' ? this.pagination.params(true) : this.pagination.params;
if (params && params.then) params = await params;
const endpoint = typeof this.pagination.endpoint === 'function' ? this.pagination.endpoint() : this.pagination.endpoint;
await this.$root.api(endpoint, {
limit: this.pagination.noPaging ? (this.pagination.limit || 10) : (this.pagination.limit || 10) + 1,
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...params
}).then(x => {
if (!this.pagination.noPaging && (x.length === (this.pagination.limit || 10) + 1)) {
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x.pop();
this.items = x;
this.more = true;
} else {
this.items = x;
this.more = false;
}
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this.offset = x.length;
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this.inited = true;
this.fetching = false;
if (opts.after) opts.after(this, null);
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}, e => {
this.fetching = false;
if (opts.after) opts.after(this, e);
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});
},
async fetchMore() {
if (!this.more || this.moreFetching || this.items.length === 0) return;
this.moreFetching = true;
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this.backed = true;
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let params = typeof this.pagination.params === 'function' ? this.pagination.params(false) : this.pagination.params;
if (params && params.then) params = await params;
const endpoint = typeof this.pagination.endpoint === 'function' ? this.pagination.endpoint() : this.pagination.endpoint;
await this.$root.api(endpoint, {
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limit: (this.pagination.limit || 10) + 1,
...(this.pagination.offsetMode ? {
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offset: this.offset,
} : {
untilId: this.items[this.items.length - 1].id,
}),
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...params
}).then(x => {
if (x.length === (this.pagination.limit || 10) + 1) {
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x.pop();
this.items = this.items.concat(x);
this.more = true;
} else {
this.items = this.items.concat(x);
this.more = false;
}
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this.offset += x.length;
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this.moreFetching = false;
}, e => {
this.moreFetching = false;
});
},
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prepend(item) {
const isTop = this.isBackTop || (document.body.contains(this.$el) && (getScrollPosition(this.$el) === 0));
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if (isTop) {
// Prepend the item
this.items.unshift(item);
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// オーバーフローしたら古いアイテムは捨てる
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if (this.items.length >= opts.displayLimit) {
this.items = this.items.slice(0, opts.displayLimit);
this.more = true;
}
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} else {
this.queue.push(item);
onScrollTop(this.$el, () => {
for (const item of this.queue) {
this.prepend(item);
}
this.queue = [];
});
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}
},
append(item) {
this.items.push(item);
},
remove(find) {
this.items = this.items.filter(x => !find(x));
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},
}
});