From 444c5835c9e99750fad5e4c58e6cd3ffd3dd4543 Mon Sep 17 00:00:00 2001
From: Martin Raifer <martin@raifer.tech>
Date: Fri, 8 Mar 2024 10:59:34 +0100
Subject: [PATCH] hide forward/back button if there is no matching image

e.g. for the first/last photo in a sequence, or when there are gaps
---
 modules/services/mapilio.js | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/modules/services/mapilio.js b/modules/services/mapilio.js
index 390fb2386..ab63c3529 100644
--- a/modules/services/mapilio.js
+++ b/modules/services/mapilio.js
@@ -377,6 +377,14 @@ export default {
             .selectAll('img')
             .remove();
 
+        wrap
+            .selectAll('button.back')
+            .classed('hide', !_cache.images.forImageId.hasOwnProperty(+id - 1));
+        wrap
+            .selectAll('button.forward')
+            .classed('hide', !_cache.images.forImageId.hasOwnProperty(+id + 1));
+
+
         getImageData(d.id,d.sequence_id).then(function () {
 
             if (d.isPano) {
@@ -467,11 +475,13 @@ export default {
 
         controlsEnter
             .append('button')
+            .classed('back', true)
             .on('click.back', step(-1))
             .text('◄');
 
         controlsEnter
             .append('button')
+            .classed('forward', true)
             .on('click.forward', step(1))
             .text('►');