From c05a4ea68f0022be16c7196fcb2c6170d9bc8cb2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?No=C3=A9=20Viricel?= <noe.viricel@wazo-lab.io>
Date: Tue, 22 Oct 2024 16:39:09 +0200
Subject: [PATCH] fix: keep isochrone across style changing #359

---
 components/Map/Map.vue | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/components/Map/Map.vue b/components/Map/Map.vue
index cbb5a259..ebfcde39 100644
--- a/components/Map/Map.vue
+++ b/components/Map/Map.vue
@@ -286,7 +286,25 @@ export default defineNuxtComponent({
           this.style = style
           this.doWithMap(() => {
             // Use no diff mode to avoid issue with added layers
-            this.map!.setStyle(style, { diff: false })
+            this.map!.setStyle(style, {
+              diff: false,
+              transformStyle: (previousStyle, nextStyle) => {
+                if (previousStyle?.sources.isochrone) {
+                  style = {
+                    ...nextStyle,
+                    sources: {
+                      ...nextStyle.sources,
+                      isochrone: previousStyle.sources.isochrone,
+                    },
+                    layers: [
+                      ...nextStyle.layers,
+                      ...previousStyle.layers.filter(l => l.id.includes('isochrone')),
+                    ],
+                  }
+                }
+                return style
+              },
+            })
             this.emitStyleLoad()
           })
         })