From 5bed9c932f4cf8c8e98dad7063f285c0dc7362e1 Mon Sep 17 00:00:00 2001
From: TekH <h.tek@digitaldata.works>
Date: Mon, 8 Jun 2026 00:00:03 +0200
Subject: [PATCH] Enable infinite signature navigation and improve button logic

Updated the `disabled` attribute logic in `EnvelopeViewer.razor`
to ensure navigation buttons are always active when signatures
exist. Modified `pdf-viewer.js` to enable infinite looping for
signature navigation, allowing users to cycle between the first
and last signatures seamlessly. Adjusted `canGoPrev` and
`canGoNext` properties to depend on the total number of
signatures, ensuring navigation is always enabled when
signatures are present.
---
 .../Pages/EnvelopeViewer.razor                 |  4 ++--
 .../wwwroot/js/pdf-viewer.js                   | 18 +++++++++++-------
 2 files changed, 13 insertions(+), 9 deletions(-)

diff --git a/EnvelopeGenerator.ReceiverUI/Pages/EnvelopeViewer.razor b/EnvelopeGenerator.ReceiverUI/Pages/EnvelopeViewer.razor
index bbeaecf1..f3bc445d 100644
--- a/EnvelopeGenerator.ReceiverUI/Pages/EnvelopeViewer.razor
+++ b/EnvelopeGenerator.ReceiverUI/Pages/EnvelopeViewer.razor
@@ -119,7 +119,7 @@
                             <div class="pdf-toolbar__section pdf-toolbar__signature-nav">
                                 <button class="pdf-toolbar__btn pdf-toolbar__btn--signature-nav" 
                                         @onclick="GoToPreviousSignature" 
-                                        disabled="@(_signedSignatures == 0)"
+                                        disabled="@(_totalSignatures == 0)"
                                         title="Vorherige Unterschrift">
                                     <svg xmlns="http://www.w3.org/2000/svg" width="14" height="14" fill="currentColor" viewBox="0 0 16 16">
                                         <path fill-rule="evenodd" d="M11.354 1.646a.5.5 0 0 1 0 .708L5.707 8l5.647 5.646a.5.5 0 0 1-.708.708l-6-6a.5.5 0 0 1 0-.708l6-6a.5.5 0 0 1 .708 0z"/>
@@ -144,7 +144,7 @@
                                 
                                 <button class="pdf-toolbar__btn pdf-toolbar__btn--signature-nav" 
                                         @onclick="GoToNextSignature" 
-                                        disabled="@(_unsignedSignatures == 0)"
+                                        disabled="@(_totalSignatures == 0)"
                                         title="Nächste Unterschrift">
                                     <svg xmlns="http://www.w3.org/2000/svg" width="14" height="14" fill="currentColor" viewBox="0 0 16 16">
                                         <path fill-rule="evenodd" d="M4.646 1.646a.5.5 0 0 1 .708 0l6 6a.5.5 0 0 1 0 .708l-6 6a.5.5 0 0 1-.708-.708L10.293 8 4.646 2.354a.5.5 0 0 1 0-.708z"/>
diff --git a/EnvelopeGenerator.ReceiverUI/wwwroot/js/pdf-viewer.js b/EnvelopeGenerator.ReceiverUI/wwwroot/js/pdf-viewer.js
index 7fb66fa6..216f7e12 100644
--- a/EnvelopeGenerator.ReceiverUI/wwwroot/js/pdf-viewer.js
+++ b/EnvelopeGenerator.ReceiverUI/wwwroot/js/pdf-viewer.js
@@ -509,9 +509,9 @@ window.pdfViewer = {
             total: total,
             signed: signed,
             unsigned: unsigned,
-            currentIndex: signed,           // Sonraki imzan?n index'i
-            canGoPrev: signed > 0,          // En az 1 imza uygulanm?? m??
-            canGoNext: unsigned > 0         // Hala imzalanmam?? var m??
+            currentIndex: signed,
+            canGoPrev: total > 0,           // Her zaman aktif (e?er imza varsa)
+            canGoNext: total > 0            // Her zaman aktif (e?er imza varsa)
         };
     },
 
@@ -533,9 +533,11 @@ window.pdfViewer = {
         }
         
         // Bir sonraki imzay? al (imzalanm?? olup olmad???na bakmadan)
-        const nextIndex = currentIndex + 1;
+        let nextIndex = currentIndex + 1;
+        
+        // Sonsuz döngü: Son imzadaysa ilk imzaya dön
         if (nextIndex >= this._allSignatures.length) {
-            return false; // Son imzaday?z
+            nextIndex = 0;  // ?lk imzaya dön
         }
         
         const nextSignature = this._allSignatures[nextIndex];
@@ -608,9 +610,11 @@ window.pdfViewer = {
         }
         
         // Bir önceki imzay? al
-        const prevIndex = currentIndex - 1;
+        let prevIndex = currentIndex - 1;
+        
+        // Sonsuz döngü: ?lk imzadaysa son imzaya git
         if (prevIndex < 0) {
-            return false; // ?lk imzaday?z
+            prevIndex = this._allSignatures.length - 1;  // Son imzaya git
         }
         
         const prevSignature = this._allSignatures[prevIndex];