upgrade packages

lib/pages/main/util.dart

@@ -19,7 +19,7 @@ Future showMsgDialog(BuildContext context, String title, String msg) {
         title: new Text(title),
         content: new Text(msg),
         actions: <Widget>[
-          new FlatButton(
+          new TextButton(
             child: new Text("Close"),
             onPressed: () {
               Navigator.of(context).pop();
@@ -51,8 +51,10 @@ Future<void> showConfirmDialog(
               mainAxisAlignment: MainAxisAlignment.spaceAround,
               crossAxisAlignment: CrossAxisAlignment.center,
               children: <Widget>[
-                FlatButton(
-                    color: Colors.grey[300],
+                TextButton(
+                    style:
+                        TextButton.styleFrom(backgroundColor: Colors.grey[300]),
+                    // color: Colors.grey[300],
                     child: Text(
                       AppTranslations.of(context)!.text('btn.cancel'),
                       style: Provider.of<LanguageModel>(context).isEng
@@ -65,8 +67,9 @@ Future<void> showConfirmDialog(
                 SizedBox(
                   width: 0,
                 ),
-                FlatButton(
-                    color: primaryColor,
+                TextButton(
+                  style: TextButton.styleFrom(backgroundColor: primaryColor),
+                    // color: primaryColor,
                     child: Text(AppTranslations.of(context)!.text('btn.ok'),
                         style: Provider.of<LanguageModel>(context).isEng
                             ? TextStyle(
@@ -343,7 +346,7 @@ Widget fcsButton(BuildContext context, String text,
       child: ButtonTheme(
         minWidth: 900.0,
         height: 100.0,
-        child: FlatButton(
+        child: TextButton(
           onPressed: callack == null ? null : () => callack(),
           child: Row(
             mainAxisAlignment: MainAxisAlignment.center,
@@ -371,7 +374,7 @@ String getLocalString(BuildContext context, String key) {
 }
 
 void showToast(GlobalKey key, String text) {
-  final ScaffoldState scaffold = key.currentState as ScaffoldState;
+  final ScaffoldMessengerState scaffold = key.currentState as ScaffoldMessengerState;
   scaffold.showSnackBar(
     SnackBar(
       content: Text(text),