页面加载优化

src/views/common/DocumentSearch.vue

@@ -247,6 +247,12 @@ export default {
             if (this.$refs.pdfWrapper && !this.$refs.pdfWrapper.style.minWidth) {
                 this.$refs.pdfWrapper.style.minWidth = `${Math.ceil(viewport.width)}px`
             }
+
+        if (!container.querySelector('.page-loader')) {
+            const loader = document.createElement('div')
+            loader.className = 'page-loader'
+            container.appendChild(loader)
+        }
         },
 
         async ensurePageCached(pageNumber) {
@@ -324,10 +330,12 @@ export default {
 
             const viewport = page.getViewport({ scale: this.scale })
             this.ensureContainerDimensions(pageNumber, viewport)
+            container.classList.add('is-loading-text')
 
             const existing = container.querySelector('.textLayer')
             if (existing && !force && this.pageTextDivs[index]?.length) {
                 existing.style.display = ''
+                container.classList.remove('is-loading-text')
                 return
             }
             if (existing) {
@@ -359,6 +367,8 @@ export default {
                 this.pageTextDivs[index] = textDivs
             } catch (error) {
                 console.warn(`加载第 ${pageNumber} 页文本失败`, error)
+            } finally {
+                container.classList.remove('is-loading-text')
             }
 
             if (container.dataset.status !== 'rendered') {
@@ -370,8 +380,20 @@ export default {
         },
 
         async renderSinglePage(pageNumber) {
-            await this.renderCanvas(pageNumber)
+            const container = this.pageContainers[pageNumber - 1]
+            if (container) {
+                container.classList.add('is-loading', 'is-loading-text')
+                this.renderingSet.add(pageNumber)
+            }
+            try {
                 await this.renderTextLayer(pageNumber, { visible: true, force: true })
+                await this.renderCanvas(pageNumber)
+            } finally {
+                if (container) {
+                    container.classList.remove('is-loading', 'is-loading-text')
+                }
+                this.renderingSet.delete(pageNumber)
+            }
         },
 
         scheduleRender(pageNumber, { priority = false } = {}) {
@@ -852,23 +874,9 @@ export default {
     -webkit-user-select: text;
 }
 
-.pdf-page.is-loading::before {
-    content: '';
-    position: absolute;
-    top: 50%;
-    left: 50%;
-    width: 48px;
-    height: 48px;
-    margin: -24px 0 0 -24px;
-    border-radius: 50%;
-    border: 4px solid rgba(86, 119, 196, 0.25);
-    border-top-color: rgba(86, 119, 196, 0.9);
-    animation: pdf-page-spin 0.9s linear infinite;
-    z-index: 5;
-}
-
 .pdf-page.is-loading::after {
     opacity: 0.5;
+    background: rgba(255, 255, 255, 0.7);
 }
 
 .pdf-page.is-loading .textLayer,
@@ -876,6 +884,29 @@ export default {
     opacity: 0.35;
 }
 
+.pdf-page .page-loader {
+    position: absolute;
+    top: 50%;
+    left: 50%;
+    width: 36px;
+    height: 36px;
+    margin: -18px 0 0 -18px;
+    border-radius: 50%;
+    display: none;
+    background:
+      radial-gradient(circle closest-side, rgba(140, 148, 160, 0.85) 92%, transparent 100%) top center/6px 6px no-repeat,
+      conic-gradient(from 0deg, rgba(140, 148, 160, 0.85) 0deg 30deg, rgba(140, 148, 160, 0.1) 30deg 360deg);
+    -webkit-mask: radial-gradient(farthest-side, transparent calc(100% - 6px), #000 calc(100% - 6px));
+    mask: radial-gradient(farthest-side, transparent calc(100% - 6px), #000 calc(100% - 6px));
+    animation: pdf-page-spin 1s steps(12) infinite;
+    z-index: 6;
+}
+
+.pdf-page.is-loading .page-loader,
+.pdf-page.is-loading-text .page-loader {
+    display: block;
+}
+
 @keyframes pdf-page-spin {
     0% {
         transform: rotate(0deg);