refactoring code to comply with null-safety

Author: deepikahr

lib/components/bottom_sheet/gf_bottom_sheet.dart

@@ -6,9 +6,9 @@ class GFBottomSheet extends StatefulWidget {
   GFBottomSheet({
     Key key,
     @required this.contentBody,
+    @required this.controller,
     this.stickyHeader,
     this.stickyFooter,
-    this.controller,
     this.minContentHeight = 0,
     this.maxContentHeight = 300,
     this.elevation = 0.0,
@@ -19,6 +19,7 @@ class GFBottomSheet extends StatefulWidget {
   })  : assert(elevation >= 0.0),
         assert(minContentHeight >= 0.0),
         assert(contentBody != null),
+        assert(controller != null),
         super(key: key) {
     controller.height = minContentHeight;
     controller.animationDuration = animationDuration;

lib/components/checkbox/gf_checkbox.dart

@@ -22,9 +22,8 @@ class GFCheckbox extends StatefulWidget {
       this.customBgColor = GFColors.SUCCESS,
       this.autofocus = false,
       this.focusNode})
-      : assert(value != null),
-        assert(onChanged != null),
-        assert(autofocus != null),
+      : assert(autofocus != null),
+        assert(value != null),
         super(key: key);
 
   /// type of [GFCheckboxType] which is of four type is basic, square, circular and custom

lib/components/checkbox_list_tile/gf_checkbox_list_tile.dart

@@ -34,10 +34,9 @@ class GFCheckboxListTile extends StatelessWidget {
     this.position = GFPosition.end,
     this.selected = false,
     this.autofocus = false,
-  })  : assert(value != null),
-        assert(onChanged != null),
-        assert(selected != null),
+  })  : assert(selected != null),
         assert(autofocus != null),
+        assert(value != null),
         super(key: key);
 
   ///type of [String] used to pass text, alternative to title property and gets higher priority than title

lib/components/dropdown/gf_dropdown.dart

@@ -32,8 +32,7 @@ class GFDropdown<T> extends StatefulWidget {
       this.border = const BorderSide(
           color: Colors.transparent, width: 1, style: BorderStyle.solid),
       this.dropdownButtonColor = GFColors.WHITE})
-      : assert(onChanged != null),
-        super(key: key);
+      : super(key: key);
 
   final DropdownButtonBuilder selectedItemBuilder;
   final List<DropdownMenuItem<T>> items;

lib/components/image/gf_image_overlay.dart

@@ -22,7 +22,6 @@ class GFImageOverlay extends StatelessWidget {
     this.border,
     this.shape = BoxShape.rectangle,
   })  : assert(shape != null),
-        assert(image != null),
         super(key: key);
 
   /// define image's [double] height

lib/components/radio/gf_radio.dart

@@ -28,10 +28,7 @@ class GFRadio<T> extends StatefulWidget {
       this.autofocus = false,
       this.focusNode,
       this.toggleable = false})
-      : assert(value != null),
-        assert(groupValue != null),
-        assert(onChanged != null),
-        assert(autofocus != null),
+      : assert(autofocus != null),
         assert(toggleable != null),
         super(key: key);
 

lib/components/radio_list_tile/gf_radio_list_tile.dart

@@ -42,10 +42,7 @@ class GFRadioListTile<T> extends StatelessWidget {
     this.selected = false,
     this.focusColor,
     this.hoverColor,
-  })  : assert(value != null),
-        assert(groupValue != null),
-        assert(onChanged != null),
-        assert(autofocus != null),
+  })  : assert(autofocus != null),
         assert(toggleable != null),
         assert(enabled != null),
         assert(selected != null),

lib/components/rating/gf_rating.dart

@@ -25,7 +25,6 @@ class GFRating extends StatefulWidget {
     this.margin = const EdgeInsets.symmetric(vertical: 16),
     this.padding = const EdgeInsets.symmetric(horizontal: 16),
   })  : assert(value != null),
-        assert(onChanged != null),
         super(key: key);
 
   /// defines total number of rating items

lib/components/sticky_header/gf_sticky_header_builder.dart

@@ -18,6 +18,8 @@ class GFStickyHeaderBuilder extends StatefulWidget {
     this.callback,
     this.stickyContentPosition = GFPosition.start,
   })  : assert(direction != null),
+        assert(stickyContentBuilder != null),
+        assert(content != null),
         super(key: key);
 
   /// builder widget can be used to define [stickyContentBuilder].

lib/components/toggle/gf_toggle.dart

@@ -30,7 +30,6 @@ class GFToggle extends StatefulWidget {
       this.borderRadius,
       this.duration = const Duration(milliseconds: 400)})
       : assert(value != null),
-        assert(onChanged != null),
         super(key: key);
 
   ///type [String] used to add custom text i.e, ON,ENABLE