Added additional ImagePicker configuration to the FormBuilderImagePicker. (#314)

Author: awhitford

lib/src/fields/form_builder_image_picker.dart

@@ -1,6 +1,7 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_form_builder/flutter_form_builder.dart';
 import 'package:flutter_form_builder/src/widgets/image_source_sheet.dart';
+import 'package:image_picker/image_picker.dart';
 
 class FormBuilderImagePicker extends StatefulWidget {
   final String attribute;
@@ -19,6 +20,23 @@ class FormBuilderImagePicker extends StatefulWidget {
   final EdgeInsets imageMargin;
   final Color iconColor;
 
+  /// Optional maximum height of image; see [ImagePicker].
+  final double maxHeight;
+
+  /// Optional maximum width of image; see [ImagePicker].
+  final double maxWidth;
+
+  /// The imageQuality argument modifies the quality of the image, ranging from
+  /// 0-100 where 100 is the original/max quality. If imageQuality is null, the
+  /// image with the original quality will be returned. See [ImagePicker].
+  final int imageQuality;
+
+  /// Use preferredCameraDevice to specify the camera to use when the source is
+  /// `ImageSource.camera`. The preferredCameraDevice is ignored when source is
+  /// `ImageSource.gallery`. It is also ignored if the chosen camera is not
+  /// supported on the device. Defaults to `CameraDevice.rear`. See [ImagePicker].
+  final CameraDevice preferredCameraDevice;
+
   const FormBuilderImagePicker({
     Key key,
     @required this.attribute,
@@ -34,6 +52,10 @@ class FormBuilderImagePicker extends StatefulWidget {
     this.onSaved,
     this.decoration = const InputDecoration(),
     this.iconColor,
+    this.maxHeight,
+    this.maxWidth,
+    this.imageQuality,
+    this.preferredCameraDevice = CameraDevice.rear,
   }) : super(key: key);
 
   @override
@@ -161,6 +183,11 @@ class _FormBuilderImagePickerState extends State<FormBuilderImagePicker> {
                                     context: context,
                                     builder: (_) {
                                       return ImageSourceSheet(
+                                        maxHeight: widget.maxHeight,
+                                        maxWidth: widget.maxWidth,
+                                        imageQuality: widget.imageQuality,
+                                        preferredCameraDevice:
+                                            widget.preferredCameraDevice,
                                         onImageSelected: (image) {
                                           field.didChange(
                                               [...field.value, image]);

lib/src/widgets/image_source_sheet.dart

@@ -5,6 +5,23 @@ import 'package:flutter/foundation.dart';
 import 'package:image_picker/image_picker.dart';
 
 class ImageSourceSheet extends StatelessWidget {
+  /// Optional maximum height of image
+  final double maxHeight;
+
+  /// Optional maximum width of image
+  final double maxWidth;
+
+  /// The imageQuality argument modifies the quality of the image, ranging from
+  /// 0-100 where 100 is the original/max quality. If imageQuality is null, the
+  /// image with the original quality will be returned.
+  final int imageQuality;
+
+  /// Use preferredCameraDevice to specify the camera to use when the source is
+  /// `ImageSource.camera`. The preferredCameraDevice is ignored when source is
+  /// `ImageSource.gallery`. It is also ignored if the chosen camera is not
+  /// supported on the device. Defaults to `CameraDevice.rear`.
+  final CameraDevice preferredCameraDevice;
+
   /// Callback when an image is selected.
   ///
   /// **Note**: This will work on web platform whereas [onImageSelected] will not.
@@ -18,14 +35,24 @@ class ImageSourceSheet extends StatelessWidget {
 
   ImageSourceSheet({
     Key key,
+    this.maxHeight,
+    this.maxWidth,
+    this.imageQuality,
+    this.preferredCameraDevice = CameraDevice.rear,
     this.onImage,
     this.onImageSelected,
   })  : assert(null != onImage || null != onImageSelected),
         super(key: key);
 
   Future<void> _onPickImage(ImageSource source) async {
     final imagePicker = ImagePicker();
-    final pickedFile = await imagePicker.getImage(source: source);
+    final pickedFile = await imagePicker.getImage(
+      source: source,
+      maxHeight: maxHeight,
+      maxWidth: maxWidth,
+      imageQuality: imageQuality,
+      preferredCameraDevice: preferredCameraDevice,
+    );
     if (null != pickedFile) {
       if (null != onImage) {
         final image = Image.memory(await pickedFile.readAsBytes());