Added contentPadding option to Checkbox, CheckboxList, Radio and Switch to allow spacing of items in list options. Closes #280

Author: danvick

lib/src/fields/form_builder_checkbox.dart

@@ -19,6 +19,7 @@ class FormBuilderCheckbox extends StatefulWidget {
   final MaterialTapTargetSize materialTapTargetSize;
   final bool tristate;
   final FormFieldSetter onSaved;
+  final EdgeInsets contentPadding;
 
   FormBuilderCheckbox({
     Key key,
@@ -36,6 +37,7 @@ class FormBuilderCheckbox extends StatefulWidget {
     this.materialTapTargetSize,
     this.tristate = false,
     this.onSaved,
+    this.contentPadding = const EdgeInsets.all(0.0),
   }) : super(key: key);
 
   @override
@@ -129,7 +131,7 @@ class _FormBuilderCheckboxState extends State<FormBuilderCheckbox> {
           child: ListTile(
             dense: true,
             isThreeLine: false,
-            contentPadding: EdgeInsets.all(0.0),
+            contentPadding: widget.contentPadding,
             title: widget.label,
             leading: _leading(field),
             trailing: _trailing(field),

lib/src/fields/form_builder_checkbox_list.dart

@@ -10,14 +10,15 @@ class FormBuilderCheckboxList extends StatefulWidget {
   final InputDecoration decoration;
   final ValueChanged onChanged;
   final ValueTransformer valueTransformer;
+  final FormFieldSetter onSaved;
 
   final List<FormBuilderFieldOption> options;
   final bool leadingInput;
   final Color activeColor;
   final Color checkColor;
   final MaterialTapTargetSize materialTapTargetSize;
   final bool tristate;
-  final FormFieldSetter onSaved;
+  final EdgeInsets contentPadding;
 
   FormBuilderCheckboxList({
     Key key,
@@ -35,6 +36,7 @@ class FormBuilderCheckboxList extends StatefulWidget {
     this.materialTapTargetSize,
     this.tristate = false,
     this.onSaved,
+    this.contentPadding = const EdgeInsets.all(0.0),
   }) : super(key: key);
 
   @override
@@ -133,7 +135,7 @@ class _FormBuilderCheckboxListState extends State<FormBuilderCheckboxList> {
             ListTile(
               dense: true,
               isThreeLine: false,
-              contentPadding: EdgeInsets.all(0.0),
+              contentPadding: widget.contentPadding,
               leading: _leading(field, i),
               trailing: _trailing(field, i),
               title: widget.options[i],

lib/src/fields/form_builder_radio.dart

@@ -10,14 +10,13 @@ class FormBuilderRadio extends StatefulWidget {
   final InputDecoration decoration;
   final ValueChanged onChanged;
   final ValueTransformer valueTransformer;
-  final bool leadingInput;
 
+  final bool leadingInput;
   final List<FormBuilderFieldOption> options;
-
   final MaterialTapTargetSize materialTapTargetSize;
-
   final Color activeColor;
   final FormFieldSetter onSaved;
+  final EdgeInsets contentPadding;
 
   FormBuilderRadio({
     Key key,
@@ -33,6 +32,7 @@ class FormBuilderRadio extends StatefulWidget {
     this.materialTapTargetSize,
     this.activeColor,
     this.onSaved,
+    this.contentPadding = const EdgeInsets.all(0.0),
   }) : super(key: key);
 
   @override
@@ -123,7 +123,7 @@ class _FormBuilderRadioState extends State<FormBuilderRadio> {
             ListTile(
               dense: true,
               isThreeLine: false,
-              contentPadding: EdgeInsets.all(0.0),
+              contentPadding: widget.contentPadding,
               leading: _leading(field, i),
               title: widget.options[i],
               trailing: _trailing(field, i),

lib/src/fields/form_builder_switch.dart

@@ -62,6 +62,7 @@ class FormBuilderSwitch extends StatefulWidget {
   /// {@macro flutter.cupertino.switch.dragStartBehavior}
   final DragStartBehavior dragStartBehavior;
   final FormFieldSetter onSaved;
+  final EdgeInsets contentPadding;
 
   FormBuilderSwitch({
     Key key,
@@ -82,6 +83,7 @@ class FormBuilderSwitch extends StatefulWidget {
     this.materialTapTargetSize,
     this.dragStartBehavior = DragStartBehavior.start,
     this.onSaved,
+    this.contentPadding = const EdgeInsets.all(0.0),
   }) : super(key: key);
 
   @override
@@ -148,7 +150,7 @@ class _FormBuilderSwitchState extends State<FormBuilderSwitch> {
             child: ListTile(
               dense: true,
               isThreeLine: false,
-              contentPadding: EdgeInsets.all(0.0),
+              contentPadding: widget.contentPadding,
               title: widget.label,
               trailing: Switch(
                 value: field.value,