gao-customer-h5/src/components/CustomerSelector.vue

<template>
	<t-popup v-model="popupVisible" placement="bottom">
		<div class="customer-selector bg-white">
			<div class="title-bar">
				<t-button variant="text" size="small" @click="cancelSelection">取消</t-button>
				<h3 class="title">选择客户</h3>
				<t-button
					v-if="isMultiple"
					theme="primary"
					variant="text"
					size="small"
					@click="confirmSelection"
				>确定</t-button>
				<span v-else class="title-placeholder" />
			</div>
			<div class="search-wrapper">
				<t-input
					v-model.trim="keyword"
					class="search"
					borderless
					clearable
					placeholder="姓名 / 编码 / 手机号"
				/>
			</div>
			<div ref="resultListRef" class="result-list">
				<customer-list
					:customer-list="customerOptions"
					:selected-id-list="draftSelectedIdList"
					:selectable="isMultiple"
					:empty-text="loading ? '正在加载客户' : '未找到匹配客户'"
					@select="toggleCustomer"
				/>
				<div class="load-state" v-text="loadStateText" />
			</div>
		</div>
	</t-popup>
</template>

<script setup lang="ts">
import { Scroller } from "timi-web";
import CustomerAPI from "@/api/CustomerAPI";
import CustomerList from "@/components/CustomerList.vue";
import type { Customer } from "@/types/Customer";

type SelectionMode = "single" | "multiple";

interface Props {
	modelValue: string | string[];
	visible: boolean;
	selectionMode?: SelectionMode;
}

const props = withDefaults(defineProps<Props>(), {
	selectionMode: "single"
});

const emit = defineEmits<{
	"update:modelValue": [value: string | string[]];
	"update:visible": [value: boolean];
	change: [value: string];
}>();

const pageSize = 20;
const scrollListenerName = "CustomerSelector";
const keyword = ref("");
const loading = ref(false);
const noMore = ref(false);
const pageIndex = ref(0);
const totalCount = ref(0);
const customerOptions = ref<Customer[]>([]);
const resultListRef = ref<HTMLElement>();
const draftSelectedIdList = ref<string[]>([]);
const selectedCustomerCache = new Map<string, Customer>();
let searchToken = 0;
let keywordTimer: number | undefined;

const isMultiple = computed(() => props.selectionMode === "multiple");
const loadStateText = computed(() => {
	if (loading.value) {
		return "正在加载更多";
	}

	return noMore.value ? `共 ${totalCount.value} 位客户` : "上拉加载更多";
});

const popupVisible = computed({
	get() {
		return props.visible;
	},
	set(value: boolean) {
		emit("update:visible", value);
	}
});

async function reloadCustomers(): Promise<void> {
	pageIndex.value = 0;
	totalCount.value = 0;
	customerOptions.value = [];
	noMore.value = false;
	await loadCustomers();
}

async function loadCustomers(): Promise<void> {
	if (loading.value || noMore.value) {
		return;
	}

	const token = searchToken + 1;
	searchToken = token;
	loading.value = true;
	try {
		const result = await CustomerAPI.list({
			index: pageIndex.value,
			size: pageSize,
			likesExample: {
				code: keyword.value || undefined,
				name: keyword.value || undefined,
				telephone: keyword.value || undefined
			}
		});
		if (token !== searchToken) {
			return;
		}
		const list = result.list || [];
		for (const item of list) {
			if (item.id) {
				selectedCustomerCache.set(item.id, item);
			}
		}
		customerOptions.value = customerOptions.value.concat(list);
		totalCount.value = result.total || 0;
		pageIndex.value += 1;
		noMore.value = totalCount.value <= customerOptions.value.length || list.length < pageSize;
	} finally {
		if (token === searchToken) {
			loading.value = false;
		}
	}
}

async function bindScrollListener(): Promise<void> {
	if (!props.visible || 0 === customerOptions.value.length) {
		Scroller.removeListener(scrollListenerName);
		return;
	}
	await nextTick();
	Scroller.addBottomListener(scrollListenerName, loadCustomers, {
		distance: 48,
		canLoad: () => props.visible && !loading.value && !noMore.value,
		getElement: () => resultListRef.value
	});
}

function getModelValueIdList(): string[] {
	const value = props.modelValue;
	return (Array.isArray(value) ? value : [value]).filter((item): item is string => Boolean(item));
}

function syncDraftSelection(): void {
	draftSelectedIdList.value = getModelValueIdList();
}

function toggleCustomer(item: Customer): void {
	const id = item.id;
	if (!id) {
		return;
	}

	selectedCustomerCache.set(id, item);
	if (!isMultiple.value) {
			emit("update:modelValue", id);
			emit("change", id);
		emit("update:visible", false);
		return;
	}

	if (draftSelectedIdList.value.includes(id)) {
		draftSelectedIdList.value = draftSelectedIdList.value.filter(itemId => itemId !== id);
		return;
	}

	draftSelectedIdList.value = [...draftSelectedIdList.value, id];
}

function cancelSelection(): void {
	syncDraftSelection();
	emit("update:visible", false);
}

function confirmSelection(): void {
	const value = [...draftSelectedIdList.value];
	emit("update:modelValue", value);
	emit("change", value as unknown as string);
	emit("update:visible", false);
}

watch(() => props.visible, async (value) => {
	if (!value) {
		syncDraftSelection();
		keyword.value = "";
		window.clearTimeout(keywordTimer);
		Scroller.removeListener(scrollListenerName);
		return;
	}
	syncDraftSelection();
	await reloadCustomers();
	await bindScrollListener();
});

watch(keyword, async () => {
	if (!props.visible) {
		return;
	}
	window.clearTimeout(keywordTimer);
	keywordTimer = window.setTimeout(async () => {
		await reloadCustomers();
		await bindScrollListener();
	}, 300);
});

watch(() => customerOptions.value.length, async () => {
	await bindScrollListener();
});

onUnmounted(() => {
	window.clearTimeout(keywordTimer);
	Scroller.removeListener(scrollListenerName);
});
</script>

<style scoped lang="less">
.customer-selector {
	display: flex;
	height: 80vh;
	padding-top: 1rem;
	border-radius: 1.25rem 1.25rem 0 0;
	flex-direction: column;

	.title-bar {
		padding: 0 1rem;
		display: grid;
		grid-template-columns: 4rem 1fr 4rem;
		align-items: center;
	}

	.title {
		margin: 0;
		text-align: center;
	}

	.title-placeholder {
		height: 1px;
	}

	.search-wrapper {
		z-index: 1;
		padding: 1rem 0 .5rem 0;
		box-shadow: 0 4px 4px rgba(0, 0, 0, .05);

		.search {
			--td-input-vertical-padding: 8px;

			flex: 0;
			margin: 0 1rem;
			border: 1px solid var(--td-component-border);
			border-radius: .875rem;
		}
	}

	.result-list {
		flex: 1;
		overflow: auto;
		min-height: 0;
		padding-bottom: env(safe-area-inset-bottom, 0);
	}

	.load-state {
		padding: .75rem;
		color: #52607a;
		text-align: center;
		font-size: .875rem;
	}
}

:global(html.theme-dark) {
	.customer-selector {
		background: rgba(15, 23, 42, .96);
	}

	.load-state {
		color: #94a3b8;
	}
}
</style>