From 4641f23796fee4be90e8b5e3986eb60be50449cf Mon Sep 17 00:00:00 2001
From: Kevin Li <kevin.li@mapbox.com>
Date: Fri, 19 Nov 2021 19:35:34 +0800
Subject: [PATCH] [Example] Implement the changePosition function for
 place_fill example. (#778)

---
 example/lib/place_fill.dart | 47 ++++++++++++++++++++++++-------------
 1 file changed, 31 insertions(+), 16 deletions(-)

diff --git a/example/lib/place_fill.dart b/example/lib/place_fill.dart
index 74c6187e1..8a39daee3 100644
--- a/example/lib/place_fill.dart
+++ b/example/lib/place_fill.dart
@@ -34,6 +34,22 @@ class PlaceFillBodyState extends State<PlaceFillBody> {
   static final LatLng center = const LatLng(-33.86711, 151.1947171);
   final String _fillPatternImage = "assets/fill/cat_silhouette_pattern.png";
 
+  final List<List<LatLng>> _defaultGeometry = [
+      [
+        LatLng(-33.719, 151.150),
+        LatLng(-33.858, 151.150),
+        LatLng(-33.866, 151.401),
+        LatLng(-33.747, 151.328),
+        LatLng(-33.719, 151.150),
+      ],
+      [
+        LatLng(-33.762, 151.250),
+        LatLng(-33.827, 151.250),
+        LatLng(-33.833, 151.347),
+        LatLng(-33.762, 151.250),
+      ]
+    ];
+
   MapboxMapController? controller;
   int _fillCount = 0;
   Fill? _selectedFill;
@@ -72,21 +88,7 @@ class PlaceFillBodyState extends State<PlaceFillBody> {
 
   void _add() {
     controller!.addFill(
-      FillOptions(geometry: [
-        [
-          LatLng(-33.719, 151.150),
-          LatLng(-33.858, 151.150),
-          LatLng(-33.866, 151.401),
-          LatLng(-33.747, 151.328),
-          LatLng(-33.719, 151.150),
-        ],
-        [
-          LatLng(-33.762, 151.250),
-          LatLng(-33.827, 151.250),
-          LatLng(-33.833, 151.347),
-          LatLng(-33.762, 151.250),
-        ]
-      ], fillColor: "#FF0000", fillOutlineColor: "#FF0000"),
+      FillOptions(geometry: _defaultGeometry, fillColor: "#FF0000", fillOutlineColor: "#FF0000"),
     );
     setState(() {
       _fillCount += 1;
@@ -102,7 +104,20 @@ class PlaceFillBodyState extends State<PlaceFillBody> {
   }
 
   void _changePosition() {
-    //TODO: Implement change position.
+    List<List<LatLng>>? geometry = _selectedFill!.options.geometry;
+
+    if (geometry == null) {
+      geometry = _defaultGeometry;
+    }
+
+    _updateSelectedFill(FillOptions(
+        geometry: geometry
+            .map((list) => list
+                .map(
+                    // Move to right with 0.1 degree on longitude
+                    (latLng) => LatLng(latLng.latitude, latLng.longitude + 0.1))
+                .toList())
+            .toList()));
   }
 
   void _changeDraggable() {