Feature/add change crop by size

example/lib/pages/camera/wechat_camera_picker.dart

@@ -82,6 +82,9 @@ class WeChatCameraPicker extends StatelessWidget with InstaPickerInterface {
                 ),
               );
             },
+            changeCropBasedOnImageSize: (p0) async {
+              return InstaAssetCropDelegate(cropRatios: [1, 4 / 5, 16 / 9]);
+            },
             // since the list is revert, use prepend to be at the top
             specialItemPosition: SpecialItemPosition.prepend,
           ),

lib/src/assets_picker.dart

@@ -36,9 +36,8 @@ class InstaAssetCropDelegate {
 class InstaAssetPickerConfig {
   const InstaAssetPickerConfig({
     /// [DefaultAssetPickerBuilderDelegate] config
-
+    required this.pickerTheme,
     this.gridCount = _kGridCount,
-    this.pickerTheme,
     this.specialItemPosition,
     this.specialItemBuilder,
     this.loadingIndicatorBuilder,
@@ -49,6 +48,7 @@ class InstaAssetPickerConfig {
     this.gridThumbnailSize = defaultAssetGridPreviewSize,
     this.previewThumbnailSize,
     this.pathNameBuilder,
+    this.changeCropBasedOnImageSize,
 
     /// [InstaAssetPickerBuilder] config
 
@@ -129,6 +129,14 @@ class InstaAssetPickerConfig {
   ///
   /// Default is unselect all assets button.
   final InstaPickerActionsBuilder? actionsBuilder;
+
+  /// This [Function] is called when an asset is selected.
+  ///
+  /// It receives de [AssetEntity] selected and can change the crop based on imageSize.
+  /// For example, if your first image is vertical, you can set the crop to 4:5.
+  /// And if it is horizontal, you can set the crop to 16:9.
+  final Future<InstaAssetCropDelegate> Function(AssetEntity)?
+      changeCropBasedOnImageSize;
 }
 
 class InstaAssetPicker {
@@ -249,15 +257,16 @@ class InstaAssetPicker {
     required DefaultAssetPickerProvider Function() provider,
     required Function(Stream<InstaAssetsExportDetails> exportDetails)
         onCompleted,
-    InstaAssetPickerConfig pickerConfig = const InstaAssetPickerConfig(),
+    InstaAssetPickerConfig? pickerConfig,
   }) async {
     PermissionState? ps;
     try {
       ps = await _permissionCheck(null);
     } catch (e) {
       _openErrorPermission(
         context,
-        pickerConfig.textDelegate,
+        (pickerConfig?.textDelegate ??
+            InstaAssetPickerConfig(pickerTheme: ThemeData()).textDelegate),
         onPermissionDenied,
       );
       return [];
@@ -272,7 +281,7 @@ class InstaAssetPicker {
       provider: restoredProvider,
       keepScrollOffset: true,
       onCompleted: onCompleted,
-      config: pickerConfig,
+      config: pickerConfig ?? InstaAssetPickerConfig(pickerTheme: ThemeData()),
       locale: Localizations.maybeLocaleOf(context),
     );
 
@@ -342,7 +351,7 @@ class InstaAssetPicker {
     /// InstaAssetPickerBuilder parameters
     required Function(Stream<InstaAssetsExportDetails> exportDetails)
         onCompleted,
-    InstaAssetPickerConfig pickerConfig = const InstaAssetPickerConfig(),
+    InstaAssetPickerConfig? pickerConfig,
 
     /// DefaultAssetPickerProvider parameters
     List<AssetEntity>? selectedAssets,
@@ -365,7 +374,8 @@ class InstaAssetPicker {
     } catch (e) {
       _openErrorPermission(
         context,
-        pickerConfig.textDelegate,
+        (pickerConfig?.textDelegate ??
+            InstaAssetPickerConfig(pickerTheme: ThemeData()).textDelegate),
         onPermissionDenied,
       );
       return [];
@@ -388,8 +398,9 @@ class InstaAssetPicker {
       provider: provider,
       keepScrollOffset: false,
       onCompleted: onCompleted,
-      config: pickerConfig,
+      config: pickerConfig ?? InstaAssetPickerConfig(pickerTheme: ThemeData()),
       locale: Localizations.maybeLocaleOf(context),
+      changeCropBasedOnImageSize: pickerConfig?.changeCropBasedOnImageSize,
     );
 
     return AssetPicker.pickAssetsWithDelegate(

lib/src/insta_assets_crop_controller.dart

@@ -117,7 +117,7 @@ class InstaAssetsCropController {
       ValueNotifier<AssetEntity?>(null);
 
   /// Options related to crop
-  final InstaAssetCropDelegate cropDelegate;
+  final ValueNotifier<InstaAssetCropDelegate> cropDelegate;
 
   /// List of all the crop parameters set by the user
   List<InstaAssetsCropData> _cropParameters = [];
@@ -134,9 +134,9 @@ class InstaAssetsCropController {
   }
 
   double get aspectRatio {
-    assert(cropDelegate.cropRatios.isNotEmpty,
+    assert(cropDelegate.value.cropRatios.isNotEmpty,
         'The list of supported crop ratios cannot be empty.');
-    return cropDelegate.cropRatios[cropRatioIndex.value];
+    return cropDelegate.value.cropRatios[cropRatioIndex.value];
   }
 
   String get aspectRatioString {
@@ -147,7 +147,7 @@ class InstaAssetsCropController {
 
   /// Set the next available index as the selected crop ratio
   void nextCropRatio() {
-    if (cropRatioIndex.value < cropDelegate.cropRatios.length - 1) {
+    if (cropRatioIndex.value < cropDelegate.value.cropRatios.length - 1) {
       cropRatioIndex.value = cropRatioIndex.value + 1;
     } else {
       cropRatioIndex.value = 0;
@@ -257,7 +257,7 @@ class InstaAssetsCropController {
         // makes the sample file to not be too small
         final sampledFile = await InstaAssetsCrop.sampleImage(
           file: file,
-          preferredSize: (cropDelegate.preferredSize / scale).round(),
+          preferredSize: (cropDelegate.value.preferredSize / scale).round(),
         );
 
         if (area == null) {

lib/src/widget/crop_viewer.dart

@@ -89,7 +89,7 @@ class CropViewerState extends State<CropViewer> {
 
             // hide crop button if an asset is selected or if there is only one crop
             final hideCropButton = selected.length > 1 ||
-                widget.controller.cropDelegate.cropRatios.length <= 1;
+                widget.controller.cropDelegate.value.cropRatios.length <= 1;
 
             return ValueListenableBuilder<int>(
               valueListenable: widget.controller.cropRatioIndex,
@@ -305,18 +305,18 @@ class _InnerCropViewState extends State<InnerCropView>
         ),
         size: 32,
         // if crop ratios are the default ones, build UI similar to instagram
-        icon:
-            widget.controller.cropDelegate.cropRatios == kDefaultInstaCropRatios
-                ? Transform.rotate(
-                    angle: 45 * math.pi / 180,
-                    child: Icon(
-                      widget.controller.aspectRatio == 1
-                          ? Icons.unfold_more
-                          : Icons.unfold_less,
-                    ),
-                  )
-                // otherwise simply display the selected aspect ratio
-                : Text(widget.controller.aspectRatioString),
+        icon: widget.controller.cropDelegate.value.cropRatios ==
+                kDefaultInstaCropRatios
+            ? Transform.rotate(
+                angle: 45 * math.pi / 180,
+                child: Icon(
+                  widget.controller.aspectRatio == 1
+                      ? Icons.unfold_more
+                      : Icons.unfold_less,
+                ),
+              )
+            // otherwise simply display the selected aspect ratio
+            : Text(widget.controller.aspectRatioString),
       ),
     );
   }

lib/src/widget/insta_asset_picker_delegate.dart

@@ -37,10 +37,11 @@ class InstaAssetPickerBuilder extends DefaultAssetPickerBuilderDelegate {
     required super.provider,
     required this.onCompleted,
     required InstaAssetPickerConfig config,
+    this.changeCropBasedOnImageSize,
     super.keepScrollOffset,
     super.locale,
-  })  : _cropController =
-            InstaAssetsCropController(keepScrollOffset, config.cropDelegate),
+  })  : _cropController = InstaAssetsCropController(keepScrollOffset,
+            ValueNotifier<InstaAssetCropDelegate>(config.cropDelegate)),
         title = config.title,
         closeOnComplete = config.closeOnComplete,
         skipCropOnComplete = config.skipCropOnComplete,
@@ -79,6 +80,14 @@ class InstaAssetPickerBuilder extends DefaultAssetPickerBuilderDelegate {
   /// Defaults to `false`, like instagram
   final bool closeOnComplete;
 
+  /// This [Function] is called when an asset is selected.
+  ///
+  /// It receives de [AssetEntity] selected and can change the crop based on imageSize.
+  /// For example, if your first image is vertical, you can set the crop to 4:5.
+  /// And if it is horizontal, you can set the crop to 16:9.
+  final Future<InstaAssetCropDelegate> Function(AssetEntity)?
+      changeCropBasedOnImageSize;
+
   /// Should the picker automatically crop when the selection is confirmed
   ///
   /// Defaults to `false`.
@@ -109,6 +118,7 @@ class InstaAssetPickerBuilder extends DefaultAssetPickerBuilderDelegate {
       _cropController.dispose();
       _cropViewPosition.dispose();
     }
+
     super.dispose();
   }
 
@@ -196,6 +206,7 @@ class InstaAssetPickerBuilder extends DefaultAssetPickerBuilderDelegate {
     if (_cropController.isCropViewReady.value != true) {
       return;
     }
+
     // if is preview asset, unselect it
     if (provider.selectedAssets.isNotEmpty &&
         _cropController.previewAsset.value == currentAsset) {
@@ -205,9 +216,15 @@ class InstaAssetPickerBuilder extends DefaultAssetPickerBuilderDelegate {
           : provider.selectedAssets.last;
       return;
     }
-
     _cropController.previewAsset.value = currentAsset;
     selectAsset(context, currentAsset, index, false);
+
+    InstaAssetCropDelegate? result =
+        await changeCropBasedOnImageSize?.call(currentAsset);
+    if (result != null) {
+      _cropController.cropDelegate.value =
+          InstaAssetCropDelegate(cropRatios: result.cropRatios);
+    }
   }
 
   /// Called when an asset is selected

test/insta_assets_picker_test.dart

@@ -1,11 +1,12 @@
+import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:insta_assets_picker/insta_assets_picker.dart';
 import 'package:insta_assets_picker/src/insta_assets_crop_controller.dart';
 
 void main() {
   test('Ensure nextCropRatio() loop', () {
-    final InstaAssetsCropController controller =
-        InstaAssetsCropController(false, const InstaAssetCropDelegate());
+    final InstaAssetsCropController controller = InstaAssetsCropController(
+        false, ValueNotifier(InstaAssetCropDelegate()));
 
     expect(controller.aspectRatio, 1);
     expect(controller.aspectRatioString, '1:1');