Added modulo 7 practice

lib/pages/practice/PracticePage.dart

@@ -3,6 +3,7 @@ import 'package:ohthatsa/pages/practice/PracticeSetup.dart';
 import 'package:ohthatsa/pages/practice/PracticeThing.dart';
 import 'package:ohthatsa/pages/practice/PracticeThingCentury.dart';
 import 'package:ohthatsa/pages/practice/PracticeThingLeap.dart';
+import 'package:ohthatsa/pages/practice/PracticeThingMod.dart';
 import 'package:ohthatsa/pages/practice/PracticeThingMonth.dart';
 import 'package:ohthatsa/AppDrawer.dart';
 import 'package:ohthatsa/pages/practice/PracticeType.dart';
@@ -44,6 +45,10 @@ class _PracticeState extends State<PracticePage> {
         this.practiceThing = PracticeThingLeap();
         break;
       }
+      case (PracticeType.mod): {
+        this.practiceThing = PracticeThingMod();
+        break;
+      }
       default: {
         //
       }

lib/pages/practice/PracticeSetupPage.dart

@@ -107,23 +107,42 @@ class _PracticeSetupState extends State<PracticeSetupPage> {
                     ]
                   ),
                   TableRow(
-                    children: <Widget>[
+                      children: <Widget>[
-                      FlatButton(
+                        FlatButton(
-                        child: Text("Leap"),
+                          child: Text("Leap"),
-                        color: Colors.blue,
+                          color: Colors.blue,
-                        textColor: Colors.white,
+                          textColor: Colors.white,
-                        onPressed: () {
+                          onPressed: () {
-                          Navigator.pushNamed(
+                            Navigator.pushNamed(
-                              context,
+                                context,
-                              '/practice/practice',
+                                '/practice/practice',
-                              arguments: PracticeSetup(_count, _showCorrect, PracticeType.leap)
+                                arguments: PracticeSetup(_count, _showCorrect, PracticeType.leap)
-                          );
+                            );
-                        },
+                          },
-                      ),
+                        ),
-                      Text("80%", textAlign: TextAlign.center, style: TextStyle(fontSize: 25)),
+                        Text("80%", textAlign: TextAlign.center, style: TextStyle(fontSize: 25)),
-                      Text("70%", textAlign: TextAlign.center, style: TextStyle(fontSize: 25)),
+                        Text("70%", textAlign: TextAlign.center, style: TextStyle(fontSize: 25)),
-                      Text("50%", textAlign: TextAlign.center, style: TextStyle(fontSize: 25))
+                        Text("50%", textAlign: TextAlign.center, style: TextStyle(fontSize: 25))
-                    ]
+                      ]
+                  ),
+                  TableRow(
+                      children: <Widget>[
+                        FlatButton(
+                          child: Text("Modulo 7"),
+                          color: Colors.blue,
+                          textColor: Colors.white,
+                          onPressed: () {
+                            Navigator.pushNamed(
+                                context,
+                                '/practice/practice',
+                                arguments: PracticeSetup(_count, _showCorrect, PracticeType.mod)
+                            );
+                          },
+                        ),
+                        Text("80%", textAlign: TextAlign.center, style: TextStyle(fontSize: 25)),
+                        Text("70%", textAlign: TextAlign.center, style: TextStyle(fontSize: 25)),
+                        Text("50%", textAlign: TextAlign.center, style: TextStyle(fontSize: 25))
+                      ]
                   ),
                   TableRow(
                     children: <Widget>[

lib/pages/practice/PracticeThingMod.dart

@@ -0,0 +1,84 @@
+import 'package:flutter/material.dart';
+import 'package:ohthatsa/pages/practice/PracticeAnswer.dart';
+import 'package:ohthatsa/pages/practice/PracticeThing.dart';
+import 'package:ohthatsa/pages/practice/PracticeType.dart';
+
+class PracticeThingMod extends PracticeThing {
+  int current;
+
+  PracticeThingMod() {
+    next();
+  }
+
+  @override
+  bool answer(int answer) {
+    answers.add(PracticeAnswer(current, answer, PracticeType.mod));
+    final correctAnswer = current % 7;
+    return answer == correctAnswer;
+  }
+
+  @override
+  void next() {
+    current = random.nextInt(141);
+  }
+
+  @override
+  Text getAppBarTitleText() {
+    return Text("Practicing Modulo");
+  }
+
+  @override
+  List<bool> getBoolAnswers() {
+    return answers.map((answer) =>
+      answer.question % 7 == answer.answer
+    ).toList();
+  }
+
+  Text getCurrentQuestionText(){
+    return Text(
+        current.toString(),
+        style: TextStyle(
+            fontSize: 30
+        )
+    );
+  }
+
+  Text getLastAnswerText(bool showCorrect){
+    String text = "-";
+    Color color = Colors.red;
+    if(answers.length >= 1){
+      final answer = answers[answers.length - 1];
+      final correctAnswer = answer.question % 7;
+      text = answer.question.toString() + (showCorrect ? ": $correctAnswer" : "");
+      if(answer.answer == correctAnswer){
+        color = Colors.green;
+      }
+    }
+    return Text(
+        text,
+        style: TextStyle(
+            fontSize: 15,
+            color: color
+        )
+    );
+  }
+  Text getSecondLastAnswerText(bool showCorrect){
+    String text = "-";
+    Color color = Colors.red;
+    if(answers.length >= 2){
+      final answer = answers[answers.length - 2];
+      final correctAnswer = answer.question % 7;
+      text = answer.question.toString() + (showCorrect ? ": $correctAnswer" : "");
+      if(answer.answer == correctAnswer){
+        color = Colors.green;
+      }
+    }
+    return Text(
+        text,
+        style: TextStyle(
+            fontSize: 10,
+            color: color
+        )
+    );
+  }
+}

lib/pages/practice/PracticeType.dart

@@ -2,5 +2,6 @@ enum PracticeType {
   month,
   century,
   leap,
+  mod,
   all
 }