From c5d14a0feaf5a1c69c03fbd6bfdc050f281d76d3 Mon Sep 17 00:00:00 2001
From: l <leilygoli100@gmail.com>
Date: Sat, 10 Jul 2021 03:20:58 +0430
Subject: [PATCH 1/2] Add zoom limit for scaling.

---
 lib/src/crop.dart | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/lib/src/crop.dart b/lib/src/crop.dart
index 3f2dc0f..9904b99 100644
--- a/lib/src/crop.dart
+++ b/lib/src/crop.dart
@@ -71,11 +71,13 @@ class _CropState extends State<Crop> with TickerProviderStateMixin {
   final _repaintBoundaryKey = GlobalKey();
 
   double _previousScale = 1;
+  double scaleLimit = 3; //default value 3
   Offset _previousOffset = Offset.zero;
   Offset _startOffset = Offset.zero;
   Offset _endOffset = Offset.zero;
   double _previousGestureRotation = 0.0;
 
+  set scaleLimitSetter(scale) => scaleLimit = scale;
   /// Store the pointer count (finger involved to perform scaling).
   ///
   /// This is used to compare with the value in
@@ -191,7 +193,9 @@ class _CropState extends State<Crop> with TickerProviderStateMixin {
   void _onScaleUpdate(ScaleUpdateDetails details) {
     widget.controller._offset += details.focalPoint - _previousOffset;
     _previousOffset = details.focalPoint;
-    widget.controller._scale = _previousScale * details.scale;
+    if(_previousScale < scaleLimit){
+      widget.controller._scale = _previousScale * details.scale;
+    }
     _startOffset = widget.controller._offset;
     _endOffset = widget.controller._offset;
 

From a39a0b818df581b7d1438ae6858500060f0cb9e6 Mon Sep 17 00:00:00 2001
From: l <leilygoli100@gmail.com>
Date: Sat, 10 Jul 2021 21:47:49 +0430
Subject: [PATCH 2/2] improvement in zoom constraint design

---
 example/lib/main.dart |  1 +
 lib/src/crop.dart     | 11 +++++++----
 2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/example/lib/main.dart b/example/lib/main.dart
index 518dda9..1edcad2 100644
--- a/example/lib/main.dart
+++ b/example/lib/main.dart
@@ -138,6 +138,7 @@ class _MyHomePageState extends State<MyHomePage> {
                         ),
                       )
                     : null,
+                scaleLimit: 3.0,
               ),
             ),
           ),
diff --git a/lib/src/crop.dart b/lib/src/crop.dart
index 9904b99..c495998 100644
--- a/lib/src/crop.dart
+++ b/lib/src/crop.dart
@@ -23,6 +23,7 @@ class Crop extends StatefulWidget {
   final BoxShape shape;
   final ValueChanged<MatrixDecomposition>? onChanged;
   final Duration animationDuration;
+  final double? scaleLimit;
 
   const Crop({
     Key? key,
@@ -38,6 +39,7 @@ class Crop extends StatefulWidget {
     this.interactive = true,
     this.shape = BoxShape.rectangle,
     this.onChanged,
+    this.scaleLimit,
     this.animationDuration = const Duration(milliseconds: 200),
   }) : super(key: key);
 
@@ -71,13 +73,13 @@ class _CropState extends State<Crop> with TickerProviderStateMixin {
   final _repaintBoundaryKey = GlobalKey();
 
   double _previousScale = 1;
-  double scaleLimit = 3; //default value 3
+
   Offset _previousOffset = Offset.zero;
   Offset _startOffset = Offset.zero;
   Offset _endOffset = Offset.zero;
   double _previousGestureRotation = 0.0;
 
-  set scaleLimitSetter(scale) => scaleLimit = scale;
+
   /// Store the pointer count (finger involved to perform scaling).
   ///
   /// This is used to compare with the value in
@@ -193,8 +195,9 @@ class _CropState extends State<Crop> with TickerProviderStateMixin {
   void _onScaleUpdate(ScaleUpdateDetails details) {
     widget.controller._offset += details.focalPoint - _previousOffset;
     _previousOffset = details.focalPoint;
-    if(_previousScale < scaleLimit){
-      widget.controller._scale = _previousScale * details.scale;
+    widget.controller._scale = _previousScale * details.scale;
+    if(widget.scaleLimit != null && widget.controller._scale > widget.scaleLimit!){
+      widget.controller._scale = widget.scaleLimit!;
     }
     _startOffset = widget.controller._offset;
     _endOffset = widget.controller._offset;