gaoYuJournal/miniprogram/components/journal-detail-popup/index.ts

// components/journal-detail-panel/index.ts
import { Journal } from "../../types/Journal";
import config from "../../config/index";
import Toolkit from "../../utils/Toolkit";
import { MediaAttachType, PreviewImageMetadata } from "../../types/Attachment";
import { MediaItem, MediaItemType } from "../../types/UI";
import Time from "../../utils/Time";
import { JournalApi } from "../../api/JournalApi";

interface JournalDetailPanelData {
	journals: Journal[];
	currentJournalIndex: number;
}

Component({
	properties: {
		visible: {
			type: Boolean,
			value: false
		},
		ids: {
			type: Array,
			value: []
		},
		mode: {
			type: String,
			value: "DATE"
		}
	},
	data: <JournalDetailPanelData>{
		journals: [],
		currentJournalIndex: 0,
	},
	observers: {
		async 'ids, visible'(ids: number[], visible: boolean) {
			if (visible && ids && 0 < ids.length) {
				wx.showLoading({ title: "加载中...", mask: true });
				try {
					const journals = await JournalApi.getListByIds(ids);
					journals.forEach(journal => {
						journal.date = Time.toPassedDate(journal.createdAt);
						journal.time = Time.toTime(journal.createdAt);
						journal.datetime  = Time.toPassedDateTime(journal.createdAt);

						const thumbItems = journal.items?.filter((item) => item.attachType === MediaAttachType.THUMB);
						if (!thumbItems) {
							return;
						}
						const mediaItems: MediaItem[] = thumbItems.map((thumbItem, index) => {
							const metadata = (typeof thumbItem.metadata === "string" ? JSON.parse(thumbItem.metadata) : thumbItem.metadata) as PreviewImageMetadata;
							const thumbURL = `${config.url}/attachment/read/${thumbItem.mongoId}`;
							const sourceURL = `${config.url}/attachment/read/${metadata.sourceMongoId}`;
							return {
								type: metadata.isVideo ? MediaItemType.VIDEO : MediaItemType.IMAGE,
								thumbURL,
								sourceURL,
								size: thumbItem.size || 0,
								attachmentId: thumbItem.id,
								width: metadata.width,
								height: metadata.height,
								originalIndex: index
							} as MediaItem;
						});
						journal.mediaItems = mediaItems;
						// 为每个 journal 添加分列后的 mediaItems
						(journal as any).columnedMediaItems = Toolkit.splitItemsIntoColumns(mediaItems, 3, (item) => {
							// 计算相对高度：如果有宽高信息，使用宽高比；否则假设为正方形
							if (item.width && item.height && 0 < item.width) {
								return item.height / item.width;
							}
							return 1; // 默认正方形
						});
					})
					this.setData({
						journals,
						currentJournalIndex: 0,
					});
					wx.hideLoading();
				} catch (err: any) {
					wx.hideLoading();
					wx.showToast({
						title: err.message || "加载失败",
						icon: "error"
					});
				}
			}
		}
	},

	methods: {
		/** 关闭详情 */
		closeDetail() {
			this.triggerEvent("close");
		},
		/** swiper 切换事件 */
		onSwiperChange(e: WechatMiniprogram.SwiperChange) {
			this.setData({
				currentJournalIndex: e.detail.current
			});
		},
		/** 打开位置 */
		openLocation(e: WechatMiniprogram.BaseEvent) {
			const { journalIndex } = e.currentTarget.dataset;
			if (!journalIndex && this.properties.mode !== "LOCATION") {
				return;
			}
			const journals = this.properties.journals as Journal[];
			const journal = journals[journalIndex || 0];
			if (journal.lat && journal.lng) {
				wx.openLocation({
					latitude: journal.lat,
					longitude: journal.lng,
				});
			}
		},
		/** 预览媒体 */
		previewMedia(e: WechatMiniprogram.BaseEvent) {
			const journals = this.data.journals;
			if (!journals || journals.length === 0) {
				return;
			}
			const { itemIndex } = e.currentTarget.dataset;
			const journal = journals[this.data.currentJournalIndex];
			const items = journal.mediaItems!;
			const total = items.length;

			const startIndex = Math.max(0, itemIndex - 25);
			const endIndex = Math.min(total, startIndex + 50);
			const newCurrentIndex = itemIndex - startIndex;

			const sources = items.slice(startIndex, endIndex).map((item) => {
				return {
					url: item.sourceURL,
					type: item.type === MediaItemType.IMAGE ? "image" : "video"
				}
			}) as any;
			wx.previewMedia({
				current: newCurrentIndex,
				sources
			})
		}
	}
});