From 0f1d5c452e46e16f2f71e3a655cc311f8e03a47d Mon Sep 17 00:00:00 2001
From: Hagen Schendel <hs@hschendel.de>
Date: Thu, 12 May 2022 14:44:47 -0500
Subject: [PATCH] [BUG] Emit move event even when source is custom #1231
 (#1232)

* Emit a move event on zoom or center change when event source is custom #1231

* Remove unnecessary ? operator in example code found by dart analyze

Co-authored-by: Hagen Schendel <mail@hschendel.de>
---
 .../lib/pages/tile_loading_error_handle.dart    |  2 +-
 lib/src/map/map.dart                            | 17 +++++++++++++++++
 2 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/example/lib/pages/tile_loading_error_handle.dart b/example/lib/pages/tile_loading_error_handle.dart
index 549e7142e..9aac0764b 100644
--- a/example/lib/pages/tile_loading_error_handle.dart
+++ b/example/lib/pages/tile_loading_error_handle.dart
@@ -50,7 +50,7 @@ class _TileLoadingErrorHandleState extends State<TileLoadingErrorHandle> {
                       tileProvider: const NonCachingNetworkTileProvider(),
                       errorTileCallback: (Tile tile, error) {
                         if (_needLoadingError) {
-                          WidgetsBinding.instance?.addPostFrameCallback((_) {
+                          WidgetsBinding.instance.addPostFrameCallback((_) {
                             ScaffoldMessenger.of(context).showSnackBar(SnackBar(
                               duration: const Duration(seconds: 1),
                               content: Text(
diff --git a/lib/src/map/map.dart b/lib/src/map/map.dart
index 43c359488..761bbcf65 100644
--- a/lib/src/map/map.dart
+++ b/lib/src/map/map.dart
@@ -255,6 +255,23 @@ class MapState {
           source: source,
         ),
       );
+    } else if (source == MapEventSource.custom) {
+      // for custom source, emit move event if zoom or center has changed
+      if (targetZoom != _zoom ||
+          _lastCenter == null ||
+          targetCenter.latitude != _lastCenter!.latitude ||
+          targetCenter.longitude != _lastCenter!.longitude) {
+        emitMapEvent(
+          MapEventMove(
+            id: id,
+            center: _lastCenter!,
+            zoom: _zoom,
+            targetCenter: targetCenter,
+            targetZoom: targetZoom,
+            source: source,
+          ),
+        );
+      }
     }
   }