Redirect kanji function

lib/components/kanji/kanji_search_page.dart

@@ -23,30 +23,6 @@ class _Header extends StatelessWidget {
   _Header(this._kanji);
 }
 
-class _JlptLevel extends StatelessWidget {
-  final String _jlptLevel;
-
-  @override
-  Widget build(BuildContext context) {
-    return Container(
-      padding: EdgeInsets.all(10.0),
-      child: Text(
-        _jlptLevel,
-        style: TextStyle(
-          color: Colors.white,
-          fontSize: 20.0,
-        ),
-      ),
-      decoration: BoxDecoration(
-        shape: BoxShape.circle,
-        color: Colors.blue,
-      ),
-    );
-  }
-
-  _JlptLevel(this._jlptLevel);
-}
-
 class _Rank extends StatelessWidget {
   final int _rank;
 
@@ -71,6 +47,30 @@ class _Rank extends StatelessWidget {
   _Rank(this._rank);
 }
 
+class _JlptLevel extends StatelessWidget {
+  final String _jlptLevel;
+
+  @override
+  Widget build(BuildContext context) {
+    return Container(
+      padding: EdgeInsets.all(10.0),
+      child: Text(
+        _jlptLevel,
+        style: TextStyle(
+          color: Colors.white,
+          fontSize: 20.0,
+        ),
+      ),
+      decoration: BoxDecoration(
+        shape: BoxShape.circle,
+        color: Colors.blue,
+      ),
+    );
+  }
+
+  _JlptLevel(this._jlptLevel);
+}
+
 class _Grade extends StatelessWidget {
   final String _grade;
 
@@ -87,7 +87,7 @@ class _Grade extends StatelessWidget {
       ),
       decoration: BoxDecoration(
         color: Colors.blue,
-        borderRadius: BorderRadius.circular(10.0),
+        shape: BoxShape.circle,
       ),
     );
   }
@@ -106,7 +106,7 @@ class _Radical extends StatelessWidget {
         _radical.symbol,
         style: TextStyle(
           color: Colors.white,
-          fontSize: 20.0,
+          fontSize: 40.0,
         ),
       ),
       decoration: BoxDecoration(
@@ -186,19 +186,19 @@ class KanjiResultCard extends StatelessWidget {
                     Row(
                       children: [
                         Text("JLPT: ", style: TextStyle(fontSize: 20.0)),
-                        _JlptLevel(_result.jlptLevel),
+                        _JlptLevel(_result.jlptLevel ?? "⨉"),
                       ],
                     ),
                     Row(
                       children: [
                         Text("Grade: ", style: TextStyle(fontSize: 20.0)),
-                        _Grade(_result.taughtIn),
+                        _Grade(_result.taughtIn ?? "⨉"),
                       ],
                     ),
                     Row(
                       children: [
                         Text("Rank: ", style: TextStyle(fontSize: 20.0)),
-                        _Rank(_result.newspaperFrequencyRank),
+                        _Rank(_result.newspaperFrequencyRank ?? -1),
                       ],
                     ),
                   ],

lib/screens/kanji_search.dart

@@ -4,6 +4,6 @@ import 'package:jisho_study_tool/services/jisho_search.dart';
 class KanjiView extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
-    return searchForKanji('拒');
+    return searchForKanji('黽');
   }
 }

lib/services/jisho_search.dart

@@ -1,21 +1,22 @@
 import 'package:flutter/material.dart';
+import './kanji_search.dart';
 import 'package:unofficial_jisho_api/api.dart' as jisho;
 
 import 'package:jisho_study_tool/components/kanji/kanji_search_page.dart';
 
 Widget searchForKanji(String kanji) {
   return FutureBuilder(
-      future: jisho.searchForKanji(kanji),
-      builder:
-          (BuildContext context, AsyncSnapshot<jisho.KanjiResult> snapshot) {
-        if (snapshot.hasData) {
-          return KanjiResultCard(snapshot.data);
-        } else if (snapshot.hasError) {
-          throw 'ASYNC ERROR';
-        } else {
-          return Center(
-            child: CircularProgressIndicator(),
-          );
-        }
-      });
+    future: fetchKanji(kanji),
+    builder: (BuildContext context, AsyncSnapshot<jisho.KanjiResult> snapshot) {
+      if (snapshot.hasData) {
+        return KanjiResultCard(snapshot.data);
+      } else if (snapshot.hasError) {
+        throw 'ASYNC ERROR';
+      } else {
+        return Center(
+          child: CircularProgressIndicator(),
+        );
+      }
+    },
+  );
 }

lib/services/kanji_search.dart

@@ -0,0 +1,23 @@
+import 'package:unofficial_jisho_api/api.dart' as jisho;
+
+String _convertGrade(String grade) {
+  const _conversionTable = {
+    "grade 1": "小1",
+    "grade 2": "小2",
+    "grade 3": "小3",
+    "grade 4": "小4",
+    "grade 5": "小5",
+    "grade 6": "小6",
+    "junior high": "中"
+  };
+
+  print('conversion run: $grade -> ${_conversionTable[grade]}');
+
+  return _conversionTable[grade];
+}
+
+Future<jisho.KanjiResult> fetchKanji(String kanji) async {
+  final result = await jisho.searchForKanji(kanji);
+  result.taughtIn = _convertGrade(result.taughtIn);
+  return result;
+}