null-safety migration completed

Author: krishnatejakanchi

lib/components/badge/gf_button_badge.dart

@@ -29,7 +29,7 @@ class GFButtonBadge extends StatefulWidget {
     this.clipBehavior = Clip.none,
     this.focusNode,
     this.autofocus = false,
-    // TODO(krishna)
+    // TODO(krishna): 
     MaterialTapTargetSize? materialTapTargetSize,
     this.type = GFButtonType.solid,
     this.shape = GFButtonShape.standard,

lib/components/bottom_sheet/gf_bottom_sheet.dart

@@ -118,7 +118,7 @@ class _GFBottomSheetState extends State<GFBottomSheet>
     _controllerListener = () {
       widget.controller.value ? _showBottomSheet() : _hideBottomSheet();
     };
-    widget.controller.addListener(_controllerListener as void Function());
+    widget.controller.addListener(_controllerListener);
   }
 
   @override

lib/components/checkbox/gf_checkbox.dart

@@ -43,7 +43,7 @@ class GFCheckbox extends StatefulWidget {
   final Color inactiveBorderColor;
 
   /// Called when the user checks or unchecks the checkbox.
-  final ValueChanged<bool> onChanged;
+  final ValueChanged<bool>? onChanged;
 
   /// Used to set the current state of the checkbox
   final bool value;
@@ -85,7 +85,7 @@ class _GFCheckboxState extends State<GFCheckbox> {
           canRequestFocus: enabled,
           onTap: widget.onChanged != null
               ? () {
-                  widget.onChanged(!widget.value);
+                  widget.onChanged!(!widget.value);
                 }
               : null,
           child: Container(

lib/components/checkbox_list_tile/gf_checkbox_list_tile.dart

@@ -83,7 +83,7 @@ class GFCheckboxListTile extends StatelessWidget {
   final Color inactiveBorderColor;
 
   /// Called when the user checks or unchecks the checkbox.
-  final ValueChanged<bool> onChanged;
+  final ValueChanged<bool>? onChanged;
 
   /// Used to set the current state of the checkbox
   final bool value;
@@ -133,7 +133,7 @@ class GFCheckboxListTile extends StatelessWidget {
         enabled: onChanged != null,
         onTap: onChanged != null
             ? () {
-                onChanged(!value);
+                onChanged!(!value);
               }
             : null,
         selected: selected,

lib/components/drawer/gf_drawer.dart

@@ -64,7 +64,7 @@ class GFDrawer extends StatelessWidget {
     this.colorFilter,
     this.gradient,
     this.color,
-  })  : assert(elevation != null && elevation >= 0.0),
+  })  : assert(elevation >= 0.0),
         super(key: key);
 
   /// The z-coordinate at which to place this drawer relative to its parent.
@@ -117,7 +117,7 @@ class GFDrawer extends StatelessWidget {
         break;
       case TargetPlatform.android:
       case TargetPlatform.fuchsia:
-        label = semanticLabel ?? MaterialLocalizations.of(context)?.drawerLabel;
+        label = semanticLabel ?? MaterialLocalizations.of(context).drawerLabel;
         break;
       default:
         break;

lib/components/radio/gf_radio.dart

@@ -54,7 +54,7 @@ class GFRadio<T> extends StatefulWidget {
   final Color inactiveBorderColor;
 
   /// Called when the user checks or unchecks the radio button
-  final ValueChanged<T> onChanged;
+  final ValueChanged<T>? onChanged;
 
   ///type of Widget used to change the  radio button's active icon
   final Widget activeIcon;
@@ -99,7 +99,7 @@ class _GFRadioState<T> extends State<GFRadio<T>> with TickerProviderStateMixin {
   void _handleChanged(bool selected) {
 
     if (selected) {
-      widget.onChanged(widget.value);
+      widget.onChanged!(widget.value);
     }
   }
 

lib/components/radio_list_tile/gf_radio_list_tile.dart

@@ -137,7 +137,7 @@ class GFRadioListTile<T> extends StatelessWidget {
   final Color inactiveBorderColor;
 
   /// Called when the user checks or unchecks the checkbox.
-  final ValueChanged<dynamic> onChanged;
+  final ValueChanged<dynamic>? onChanged;
 
   ///type of Widget used to change the  checkbox's active icon
   final Widget activeIcon;
@@ -186,11 +186,11 @@ class GFRadioListTile<T> extends StatelessWidget {
         onTap: onChanged != null
             ? () {
                 if (toggleable && checked) {
-                  onChanged(null);
+                  onChanged!(null);
                   return;
                 }
                 if (!checked) {
-                  onChanged(value);
+                  onChanged!(value);
                 }
               }
             : null,

lib/components/sticky_header/render_gf_sticky_header.dart

@@ -159,7 +159,7 @@ class RenderGFStickyHeader extends RenderBox
         }
         child.layout(innerConstraints, parentUsesSize: true);
         allottedSize += _getMainSize(child);
-        crossSize = math.max(crossSize, _getCrossSize(child)!);
+        crossSize = math.max(crossSize, _getCrossSize(child));
       }
       assert(child.parentData == childParentData);
       child = childParentData?.nextSibling;

lib/components/tabs/gf_tabbar_view.dart

@@ -127,17 +127,19 @@ class _GFTabBarViewState extends State<GFTabBarView> {
   }
 
   void _handleTabControllerAnimationTick() {
-    if (_warpUnderwayCount > 0 || !_controller!.indexIsChanging) {
-      return;
-    } // This widget is driving the controller's animation.
-    if (_controller!.index != _currentIndex) {
-      _currentIndex = _controller!.index;
-      _warpToCurrentIndex();
+    if (_controller != null) {
+      if (_warpUnderwayCount > 0 || !_controller!.indexIsChanging) {
+        return;
+      } // This widget is driving the controller's animation.
+      if (_controller!.index != _currentIndex) {
+        _currentIndex = _controller!.index;
+        _warpToCurrentIndex();
+      }
     }
   }
 
   Future<void> _warpToCurrentIndex() async {
-    if (!mounted) {
+    if (!mounted || _pageController == null || _currentIndex == null) {
       return Future<void>.value();
     }
 
@@ -188,6 +190,12 @@ class _GFTabBarViewState extends State<GFTabBarView> {
     if (notification.depth != 0) {
       return false;
     }
+    if (_controller == null ||
+        _pageController == null ||
+        _pageController?.page != null ||
+        _controller?.index == null) {
+      return false;
+    }
 
     _warpUnderwayCount += 1;
     if (notification is ScrollUpdateNotification &&
@@ -209,9 +217,9 @@ class _GFTabBarViewState extends State<GFTabBarView> {
   @override
   Widget build(BuildContext context) {
     assert(() {
-      if (_controller!.length != widget.children.length) {
+      if (_controller?.length != widget.children.length) {
         throw FlutterError(
-            'Controller\'s length property (${_controller!.length}) does not match the \n'
+            'Controller\'s length property (${_controller?.length}) does not match the \n'
             'number of tabs (${widget.children.length}) present in TabBar\'s tabs property.');
       }
       return true;

lib/components/toggle/gf_toggle.dart

@@ -104,9 +104,9 @@ class _GFToggleState extends State<GFToggle> with TickerProviderStateMixin {
 
   @override
   void dispose() {
-    if (animationController != null) {
-      animationController!.dispose();
-    }
+
+      animationController?.dispose();
+
     controller.dispose();
     super.dispose();
   }