Add animation on fill cells with color

android/gradle.properties

 org.gradle.jvmargs=-Xmx1536M
 android.useAndroidX=true
 android.enableJetifier=true
-app.versionName=0.0.9
-app.versionCode=9
+app.versionName=0.0.10
+app.versionCode=10

lib/entities/cell.dart

@@ -14,17 +14,11 @@ class Cell {
     String imageAsset = this.getImageAssetName(myProvider);
 
     return Container(
-      child: AnimatedSwitcher(
-        duration: const Duration(milliseconds: 100),
-        transitionBuilder: (Widget child, Animation<double> animation) {
-          return ScaleTransition(child: child, scale: animation);
-        },
       child: Image(
         image: AssetImage(imageAsset),
         fit: BoxFit.fill,
         key: ValueKey<int>(imageAsset.hashCode),
       ),
-      ),
     );
   }
 

lib/utils/board_utils.dart

 import 'dart:math';
+import 'dart:async';
 
 import '../entities/cell.dart';
 import '../provider/data.dart';
@@ -56,9 +57,20 @@ class BoardUtils {
     List cellsToFill = BoardUtils.getSiblingFillableCells(myProvider, 0, 0, [[0, 0]]);
     int progressBeforeMove = cellsToFill.length;
 
-    for (var cellIndex = 0; cellIndex < cellsToFill.length; cellIndex++) {
+    // Sort cells from the closest to the furthest, relatively to the top left corner
+    cellsToFill.sort((a, b) => (pow(a[0], 2) + pow(a[1], 2)).compareTo(pow(b[0], 2) + pow(b[1], 2)));
+
+    Timer _timerAnimateBoard;
+    const interval = const Duration(milliseconds: 10);
+    int cellIndex = 0;
+    _timerAnimateBoard = new Timer.periodic(
+      interval,
+      (Timer timer) {
+        if (cellIndex < cellsToFill.length) {
           myProvider.updateCellValue(cellsToFill[cellIndex][1], cellsToFill[cellIndex][0], value);
-    }
+          cellIndex++;
+        } else {
+          timer.cancel();
 
           int progressAfterMove = BoardUtils.getSiblingFillableCells(myProvider, 0, 0, [[0, 0]]).length;
           int progressDelta = progressAfterMove - progressBeforeMove;
@@ -67,6 +79,9 @@ class BoardUtils {
 
           myProvider.incrementMovesCount();
         }
+      },
+    );
+  }
 
   static List getSiblingFillableCells(Data myProvider, row, col, siblingCells) {
     List cells = myProvider.cells;