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switched/src/client/app/common/scripts/paging.ts
2019-05-21 03:07:11 +09:00

170 lines
3.6 KiB
TypeScript

import Vue from 'vue';
export default (opts) => ({
data() {
return {
items: [],
queue: [],
fetching: true,
moreFetching: false,
inited: false,
more: false
};
},
computed: {
empty(): boolean {
return this.items.length == 0 && !this.fetching && this.inited;
},
error(): boolean {
return !this.fetching && !this.inited;
}
},
watch: {
queue(x) {
if (opts.onQueueChanged) opts.onQueueChanged(this, x);
},
pagination() {
this.init();
}
},
created() {
opts.displayLimit = opts.displayLimit || 30;
this.init();
},
mounted() {
if (opts.captureWindowScroll) {
this.isScrollTop = () => {
return window.scrollY <= 8;
};
window.addEventListener('scroll', this.onWindowScroll, { passive: true });
}
},
beforeDestroy() {
if (opts.captureWindowScroll) {
window.removeEventListener('scroll', this.onWindowScroll);
}
},
methods: {
updateItem(i, item) {
Vue.set((this as any).items, i, item);
},
reload() {
this.queue = [];
this.items = [];
this.init();
},
async init() {
this.fetching = true;
let params = typeof this.pagination.params === 'function' ? this.pagination.params(true) : this.pagination.params;
if (params && params.then) params = await params;
await this.$root.api(this.pagination.endpoint, {
limit: (this.pagination.limit || 10) + 1,
...params
}).then(x => {
if (x.length == (this.pagination.limit || 10) + 1) {
x.pop();
this.items = x;
this.more = true;
} else {
this.items = x;
this.more = false;
}
this.inited = true;
this.fetching = false;
}, e => {
this.fetching = false;
});
},
async fetchMore() {
if (!this.more || this.moreFetching || this.items.length === 0) return;
this.moreFetching = true;
let params = typeof this.pagination.params === 'function' ? this.pagination.params(false) : this.pagination.params;
if (params && params.then) params = await params;
await this.$root.api(this.pagination.endpoint, {
limit: (this.pagination.limit || 10) + 1,
untilId: this.items[this.items.length - 1].id,
...params
}).then(x => {
if (x.length == (this.pagination.limit || 10) + 1) {
x.pop();
this.items = this.items.concat(x);
this.more = true;
} else {
this.items = this.items.concat(x);
this.more = false;
}
this.moreFetching = false;
}, e => {
this.moreFetching = false;
});
},
prepend(item, silent = false) {
if (opts.onPrepend) {
const cancel = opts.onPrepend(this, item, silent);
if (cancel) return;
}
if (this.isScrollTop()) {
// Prepend the item
this.items.unshift(item);
// オーバーフローしたら古い投稿は捨てる
if (this.items.length >= opts.displayLimit) {
this.items = this.items.slice(0, opts.displayLimit);
this.more = true;
}
} else {
this.queue.push(item);
}
},
append(item) {
this.items.push(item);
},
releaseQueue() {
for (const n of this.queue) {
this.prepend(n, true);
}
this.queue = [];
},
onWindowScroll() {
if (this.isScrollTop()) {
this.onTop();
}
if (this.$store.state.settings.fetchOnScroll) {
// 親要素が display none だったら弾く
// https://github.com/syuilo/misskey/issues/1569
// http://d.hatena.ne.jp/favril/20091105/1257403319
if (this.$el.offsetHeight == 0) return;
const current = window.scrollY + window.innerHeight;
if (current > document.body.offsetHeight - 8) this.onBottom();
}
},
onTop() {
this.releaseQueue();
},
onBottom() {
this.fetchMore();
}
}
});