fix creater,editor preview

miniprogram/pages/main/journal-creater/index.ts

@@ -160,14 +160,22 @@ Page({
 		})
 	},
 	preview(e: WechatMiniprogram.BaseEvent) {
+		const itemIndex = e.currentTarget.dataset.index;
+		const total = this.data.mediaList.length;
+
+		const startIndex = Math.max(0, itemIndex - 25);
+		const endIndex = Math.min(total, startIndex + 50);
+		const newCurrentIndex = itemIndex - startIndex;
+
+		const sources = this.data.mediaList.slice(startIndex, endIndex).map(item => {
+			return {
+				url: item.path,
+				type: MediaItemType[item.type].toLowerCase()
+			} as WechatMiniprogram.MediaSource;
+		});
 		wx.previewMedia({
-			current: e.currentTarget.dataset.index,
-			sources: this.data.mediaList.map(item => {
-				return {
-					url: item.path,
-					type: MediaItemType[item.type].toLowerCase()
-				} as WechatMiniprogram.MediaSource;
-			})
+			current: newCurrentIndex,
+			sources
 		});
 	},
 	deleteMedia(e: WechatMiniprogram.BaseEvent) {

miniprogram/pages/main/journal-editor/index.ts

@@ -196,10 +196,16 @@ Page({
 			type: MediaItemType[item.type].toLowerCase()
 		}));
 		const allSources = [...sources, ...newSources];
-		const currentIndex = isNewMedia ? this.data.mediaList.length + index : index;
+		const itemIndex = isNewMedia ? this.data.mediaList.length + index : index;
+		const total = allSources.length;
+
+		const startIndex = Math.max(0, itemIndex - 25);
+		const endIndex = Math.min(total, startIndex + 50);
+		const newCurrentIndex = itemIndex - startIndex;
+
 		wx.previewMedia({
-			current: currentIndex,
-			sources: allSources as WechatMiniprogram.MediaSource[]
+			current: newCurrentIndex,
+			sources: allSources.slice(startIndex, endIndex) as WechatMiniprogram.MediaSource[]
 		});
 	},
 	/** 删除附件 */