feat: introduce SearchController to enable PDF text search and result highlighting.

Author: JuliusBairaktaris

viewer/js/search_controller.js

@@ -70,9 +70,6 @@ export class SearchController {
             this.notifyMatchUpdate();
             this.showMatch(this.matches[0]);
         } else {
-            if (this.onNoResults) {
-                this.onNoResults();
-            }
             if (this.onUpdateCounter) {
                 this.onUpdateCounter(0, 0);
             }
@@ -96,7 +93,6 @@ export class SearchController {
             }
         }
 
-        this.notifyMatchUpdate();
         this.showMatch(this.matches[this.currentMatchIndex]);
     }
 
@@ -117,13 +113,19 @@ export class SearchController {
     }
 
     showMatch(match) {
-        if (match.pageNum === this.activePage && this.activeTextLayer) {
-            // Already on the same page, just redraw highlights to try to avoid full re-render
-            // Update: calling getPageCallback might be ignored by index.js if page is same,
-            // so we MUST redraw manually here to update the 'selected' highlight.
-            this.drawPageMatches(match.pageNum, this.activeTextLayer);
+        const textLayer = this.activeTextLayer || document.getElementById("text");
+
+        let currentPage = this.activePage;
+        if (typeof channel !== 'undefined' && channel.getPage()) {
+            currentPage = channel.getPage();
         }
-        // Always request page navigation to ensure we are on the right page
+
+        if (match.pageNum === currentPage && textLayer) {
+            this.drawPageMatches(match.pageNum, textLayer);
+        } else if (this.activePage === 0 && textLayer) {
+            this.drawPageMatches(match.pageNum, textLayer);
+        }
+
         this.getPageCallback(match.pageNum);
     }