From 7df84a2cb8ef781be15f40363d78d95d12f55e84 Mon Sep 17 00:00:00 2001
From: BTMuli <bt-muli@outlook.com>
Date: Wed, 25 Mar 2026 20:24:52 +0800
Subject: [PATCH] =?UTF-8?q?=E2=9C=A8=20=E5=A2=9E=E5=BC=BA=E5=9B=BE?=
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---
 src/components/viewPost/vp-overlay-image.vue | 322 +++++++++++++++----
 1 file changed, 266 insertions(+), 56 deletions(-)

diff --git a/src/components/viewPost/vp-overlay-image.vue b/src/components/viewPost/vp-overlay-image.vue
index a8bf5fc5..77d640f5 100644
--- a/src/components/viewPost/vp-overlay-image.vue
+++ b/src/components/viewPost/vp-overlay-image.vue
@@ -1,9 +1,29 @@
 <!-- 图片浮窗 -->
 <template>
-  <TOverlay v-model="visible" blur-val="10px">
+  <TOverlay v-model="visible" :outer-close="outerClose" blur-val="10px">
     <div class="tpoi-box">
-      <div :class="{ 'tpoi-top-ori': isOriSize, 'tpoi-top': !isOriSize }">
-        <img :src="localLink" alt="图片" @click="isOriSize = !isOriSize" />
+      <div
+        :class="{ 'tpoi-top-scroll': !isDragMode && !isResetting }"
+        class="tpoi-top"
+        @click="onBoxClick"
+        @mousedown="onBoxMouseDown"
+        @mouseup="onBoxMouseUp"
+        @wheel="onWheel"
+      >
+        <img
+          ref="VpOiRef"
+          :draggable="false"
+          :src="localLink"
+          :style="imgStyle"
+          alt="图片"
+          @click="onImgClick"
+          @load="onImageLoad"
+          @mousedown="onImgMouseDown"
+          @mouseleave="onImgMouseUp"
+          @mousemove="onImgMouseMove"
+          @mouseup="onImgMouseUp"
+        />
+        <div v-if="showScaleHint" class="tpoi-scale-hint">{{ Math.round(scale * 100) }}%</div>
       </div>
       <div class="tpoi-bottom">
         <template v-if="typeof props.image.insert.image !== 'string'">
@@ -41,13 +61,15 @@
               <span>格式：</span>
               <span>{{ format }}</span>
             </span>
+            <span class="tpoi-info-item">
+              <span>缩放：</span>
+              <span>{{ Math.round(scale * 100) }}%</span>
+            </span>
           </div>
         </template>
         <div class="tpoi-tools">
-          <v-icon v-if="showOri" title="切换背景色" @click="setBlackBg">
-            mdi-format-color-fill
-          </v-icon>
-          <v-icon v-else title="查看原图" @click="showOri = true">mdi-magnify</v-icon>
+          <v-icon v-if="!showOri" title="查看原图" @click="showOri = true">mdi-magnify</v-icon>
+          <v-icon v-else title="切换背景色" @click="setBlackBg">mdi-format-color-fill</v-icon>
           <v-icon v-if="showCopy" title="复制到剪贴板" @click="onCopy">mdi-content-copy</v-icon>
           <v-icon title="下载到本地" @click="onDownload">mdi-download</v-icon>
           <v-icon title="关闭浮窗" @click="visible = false">mdi-close</v-icon>
@@ -62,18 +84,32 @@ import showLoading from "@comp/func/loading.js";
 import showSnackbar from "@comp/func/snackbar.js";
 import { copyToClipboard, getImageBuffer, saveCanvasImg } from "@utils/TGShare.js";
 import { bytesToSize } from "@utils/toolFunc.js";
-import { computed, nextTick, ref, shallowRef } from "vue";
+import { computed, nextTick, onMounted, onUnmounted, ref, shallowRef, useTemplateRef } from "vue";
 
 import type { TpImage } from "./tp-image.vue";
 
-/**
- * 图片浮窗组件参数
- */
-type TpoImageProps = {
-  /* 图片数据 */
-  image: TpImage;
+type TpoImageProps = { image: TpImage };
+type ImageNaturalSize = { width: number; height: number };
+type ImageStyle = {
+  transform: string;
+  transformOrigin: string;
+  transition: string;
+  cursor: string;
+  width?: string;
+  height?: string;
+  maxWidth?: string;
+  maxHeight?: string;
 };
 
+const BG_LABELS: ReadonlyArray<string> = ["透明", "黑色", "白色"];
+const RESET_DELAY: Readonly<number> = 800;
+const SCALE_HINT_DELAY: Readonly<number> = 1000;
+const OUTER_CLOSE_DELAY: Readonly<number> = 800;
+const DRAG_THRESHOLD: Readonly<number> = 5;
+const MIN_SCALE: Readonly<number> = 0.1;
+const MAX_SCALE: Readonly<number> = 10;
+const ZOOM_STEP: Readonly<number> = 0.1;
+
 const props = defineProps<TpoImageProps>();
 const visible = defineModel<boolean>();
 const localLink = defineModel<string>("link");
@@ -81,26 +117,204 @@ const showOri = defineModel<boolean>("ori");
 const bgColor = defineModel<string>("bgColor", { default: "transparent" });
 const format = defineModel<string>("format", { default: "png" });
 
-const bgMode = ref<number>(0); // 0: transparent, 1: black, 2: white
-const isOriSize = ref<boolean>(false);
+const bgMode = ref<number>(0);
 const buffer = shallowRef<ArrayBuffer | null>(null);
+
+const scale = ref<number>(1);
+const positionX = ref<number>(0);
+const positionY = ref<number>(0);
+const isDragging = ref<boolean>(false);
+const isDragMode = ref<boolean>(false);
+const isResetting = ref<boolean>(false);
+const hasDragged = ref<boolean>(false);
+const showScaleHint = ref<boolean>(false);
+const outerClose = ref<boolean>(true);
+const dragStartX = ref<number>(0);
+const dragStartY = ref<number>(0);
+const clickStartX = ref<number>(0);
+const clickStartY = ref<number>(0);
+
+let scaleHintTimer: number | null = null;
+
+const imgOriSize = shallowRef<ImageNaturalSize>({ width: 0, height: 0 });
+const imgEl = useTemplateRef<HTMLImageElement>("VpOiRef");
 const oriLink = computed<string>(() => miniImgUrl());
 const showCopy = computed<boolean>(() => {
-  // 只能显示 png/jpg/jpeg/webp 格式的复制按钮
   return ["png", "jpg", "jpeg", "webp"].includes(format.value.toLowerCase());
 });
 
+onMounted(() => {
+  document.addEventListener("mouseup", onDocumentMouseUp);
+});
+
+onUnmounted(() => {
+  document.removeEventListener("mouseup", onDocumentMouseUp);
+});
+
+function getImageNaturalSize(): ImageNaturalSize {
+  if (typeof props.image.insert.image !== "string") {
+    return {
+      width: props.image.insert.image.width ?? 0,
+      height: props.image.insert.image.height ?? 0,
+    };
+  }
+  if (props.image.attributes?.width && props.image.attributes?.height) {
+    return {
+      width: props.image.attributes.width,
+      height: props.image.attributes.height,
+    };
+  }
+  return { width: 0, height: 0 };
+}
+
+function miniImgUrl(): string {
+  const url =
+    typeof props.image.insert.image === "string"
+      ? props.image.insert.image
+      : props.image.insert.image.url;
+  const link = new URL(url);
+  return `${link.origin}${link.pathname}`;
+}
+
+const imgStyle = computed<ImageStyle>(() => {
+  const baseStyle: ImageStyle = {
+    transform: `translate(${positionX.value}px, ${positionY.value}px) scale(${scale.value})`,
+    transformOrigin: "center center",
+    transition: isDragging.value ? "none" : "transform 0.3s ease",
+    cursor: isDragMode.value ? (isDragging.value ? "grabbing" : "grab") : "zoom-in",
+  };
+
+  if (isDragMode.value && imgOriSize.value.width > 0 && imgOriSize.value.height > 0) {
+    return {
+      ...baseStyle,
+      width: `${imgOriSize.value.width}px`,
+      height: `${imgOriSize.value.height}px`,
+      maxWidth: "none",
+      maxHeight: "none",
+    };
+  }
+
+  return baseStyle;
+});
+
+function showScaleHintTimer(): void {
+  showScaleHint.value = true;
+  if (scaleHintTimer !== null) {
+    clearTimeout(scaleHintTimer);
+  }
+  scaleHintTimer = window.setTimeout(() => {
+    showScaleHint.value = false;
+    scaleHintTimer = null;
+  }, SCALE_HINT_DELAY);
+}
+
+async function resetTransform(): Promise<void> {
+  isResetting.value = true;
+  showScaleHintTimer();
+  scale.value = 1;
+  positionX.value = 0;
+  positionY.value = 0;
+  await nextTick();
+  isDragMode.value = false;
+  await new Promise((resolve) => setTimeout(resolve, RESET_DELAY));
+  isResetting.value = false;
+}
+
+function onDocumentMouseUp(): void {
+  isDragging.value = false;
+}
+
+function onBoxClick(event: MouseEvent): void {
+  if (event.button !== 0) return;
+  if (event.target === imgEl.value) return;
+  if (isDragMode.value && !hasDragged.value) {
+    resetTransform();
+  }
+  hasDragged.value = false;
+}
+
+function onBoxMouseDown(): void {
+  outerClose.value = false;
+}
+
+async function onBoxMouseUp(): Promise<void> {
+  await nextTick();
+  await new Promise<void>((resolve) => window.setTimeout(resolve, OUTER_CLOSE_DELAY));
+  outerClose.value = true;
+}
+
+async function onImgClick(event: MouseEvent): Promise<void> {
+  if (event.button !== 0) return;
+  if (!isDragMode.value) {
+    if (!showOri.value) {
+      showOri.value = true;
+      return;
+    }
+    isDragMode.value = true;
+    imgOriSize.value = getImageNaturalSize();
+    scale.value = 1;
+    positionX.value = 0;
+    positionY.value = 0;
+    showScaleHintTimer();
+  } else if (!hasDragged.value) {
+    await resetTransform();
+  }
+  hasDragged.value = false;
+}
+
+function onImageLoad(): void {
+  if (imgEl.value) {
+    imgOriSize.value = {
+      width: imgEl.value.naturalWidth,
+      height: imgEl.value.naturalHeight,
+    };
+  }
+}
+
+function onImgMouseDown(event: MouseEvent): void {
+  if (event.button !== 0 || !isDragMode.value) return;
+  event.preventDefault();
+  clickStartX.value = event.clientX;
+  clickStartY.value = event.clientY;
+  isDragging.value = true;
+  hasDragged.value = false;
+  dragStartX.value = event.clientX - positionX.value;
+  dragStartY.value = event.clientY - positionY.value;
+}
+
+function onImgMouseMove(event: MouseEvent): void {
+  if (!isDragging.value || !isDragMode.value) return;
+  event.preventDefault();
+  const dx = event.clientX - clickStartX.value;
+  const dy = event.clientY - clickStartY.value;
+  if (Math.abs(dx) > DRAG_THRESHOLD || Math.abs(dy) > DRAG_THRESHOLD) {
+    hasDragged.value = true;
+  }
+  positionX.value = event.clientX - dragStartX.value;
+  positionY.value = event.clientY - dragStartY.value;
+}
+
+function onImgMouseUp(event: MouseEvent): void {
+  if (!isDragging.value) return;
+  event.stopPropagation();
+  isDragging.value = false;
+}
+
+function onWheel(event: WheelEvent): void {
+  if (!isDragMode.value) return;
+  event.preventDefault();
+  const delta = event.deltaY > 0 ? -ZOOM_STEP : ZOOM_STEP;
+  const newScale = Math.min(MAX_SCALE, Math.max(MIN_SCALE, scale.value + delta));
+  if (newScale !== scale.value) {
+    scale.value = newScale;
+    showScaleHintTimer();
+  }
+}
+
 function setBlackBg(): void {
   bgMode.value = (bgMode.value + 1) % 3;
-  const bgLabelList = ["透明", "黑色", "白色"];
-  showSnackbar.success(`背景已切换为${bgLabelList[bgMode.value]}`);
-  if (bgMode.value === 0) {
-    bgColor.value = "transparent";
-  } else if (bgMode.value === 1) {
-    bgColor.value = "black";
-  } else {
-    bgColor.value = "white";
-  }
+  showSnackbar.success(`背景已切换为${BG_LABELS[bgMode.value]}`);
+  bgColor.value = bgMode.value === 0 ? "transparent" : bgMode.value === 1 ? "black" : "white";
 }
 
 async function onCopy(): Promise<void> {
@@ -132,17 +346,6 @@ async function onDownload(): Promise<void> {
   await saveCanvasImg(buffer.value, fileName, format.value);
   await showLoading.end();
 }
-
-function miniImgUrl(): string {
-  let url: string;
-  if (typeof props.image.insert.image === "string") {
-    url = props.image.insert.image;
-  } else {
-    url = props.image.insert.image.url;
-  }
-  const link = new URL(url);
-  return `${link.origin}${link.pathname}`;
-}
 </script>
 <style lang="css" scoped>
 .tpoi-box {
@@ -154,12 +357,13 @@ function miniImgUrl(): string {
   align-items: center;
   justify-content: flex-start;
   row-gap: 12px;
-  transition: all 0.5s;
+  transition: all 0.8s ease;
 }
 
 .tpoi-top {
   position: relative;
   display: flex;
+  overflow: hidden;
   width: 100%;
   max-height: 70%;
   box-sizing: border-box;
@@ -167,28 +371,19 @@ function miniImgUrl(): string {
   justify-content: center;
   border: 1px solid var(--tgc-od-white);
   border-radius: 4px;
-  cursor: zoom-in;
-  overflow-y: auto;
-
-  img {
-    max-width: 100%;
-    max-height: 100%;
-    border-radius: 4px;
-    background: v-bind(bgColor); /* stylelint-disable-line value-keyword-case */
-    object-fit: contain;
-  }
+  background: v-bind(bgColor); /* stylelint-disable-line value-keyword-case */
 }
 
-.tpoi-top-ori {
-  position: relative;
+.tpoi-top-scroll {
   overflow: auto;
-  max-width: 100%;
-  max-height: 70%;
-  cursor: zoom-out;
+}
 
-  img {
-    background: v-bind(bgColor); /* stylelint-disable-line value-keyword-case */
-  }
+.tpoi-top img {
+  max-width: 100%;
+  max-height: 100%;
+  border-radius: 4px;
+  object-fit: contain;
+  user-select: none;
 }
 
 .tpoi-bottom {
@@ -226,4 +421,19 @@ function miniImgUrl(): string {
 .tpoi-tools v-icon {
   cursor: pointer;
 }
+
+.tpoi-scale-hint {
+  position: absolute;
+  z-index: 10;
+  top: 50%;
+  left: 50%;
+  padding: 8px 16px;
+  border-radius: 4px;
+  background: rgb(0 0 0 / 70%);
+  color: #ffffff;
+  font-size: 18px;
+  font-weight: bold;
+  pointer-events: none;
+  transform: translate(-50%, -50%);
+}
 </style>