Support for saving goal weight

examples/fitness/lib/main.dart

@@ -22,6 +22,7 @@ part 'settings.dart';
 
 abstract class UserData {
   BackupMode get backupMode;
+  double get goalWeight;
   List<FitnessItem> get items;
 }
 
@@ -32,31 +33,29 @@ class UserDataImpl extends UserData {
 
   BackupMode _backupMode;
   BackupMode get backupMode => _backupMode;
-  void setBackupModeAndSave(BackupMode value) {
+  void set backupMode(BackupMode value) {
     _backupMode = value;
-    save();
   }
 
-  List<FitnessItem> get items => _items;
-  void set items(List<FitnessItem> newItems) {
-    _items = [];
-    _items.addAll(newItems);
-    sort();
+  double _goalWeight;
+  double get goalWeight => _goalWeight;
+  void set goalWeight(double value) {
+    _goalWeight = value;
   }
 
+  List<FitnessItem> get items => _items;
+
   void sort() {
     _items.sort((a, b) => -a.when.compareTo(b.when));
   }
 
-  void addAndSave(FitnessItem item) {
+  void add(FitnessItem item) {
     _items.add(item);
     sort();
-    save();
   }
 
-  void removeAndSave(FitnessItem item) {
+  void remove(FitnessItem item) {
     _items.remove(item);
-    save();
   }
 
   Future save() => saveFitnessData(this);
@@ -72,12 +71,14 @@ class UserDataImpl extends UserData {
     } catch(e) {
       print("Failed to load backup mode: ${e}");
     }
+    _goalWeight = json['goalWeight'];
   }
 
   Map toJson() {
     Map json = new Map();
     json['items'] = _items.map((item) => item.toJson()).toList();
     json['backupMode'] = _backupMode.toString();
+    json['goalWeight'] = _goalWeight;
     return json;
   }
 }
@@ -139,17 +140,26 @@ class FitnessApp extends App {
   }
 
   void _handleItemCreated(FitnessItem item) {
-    setState(() => _userData.addAndSave(item));
+    setState(() {
+      _userData.add(item);
+      _userData.save();
+    });
   }
 
   void _handleItemDeleted(FitnessItem item) {
-    setState(() => _userData.removeAndSave(item));
+    setState(() {
+      _userData.remove(item);
+      _userData.save();
+    });
   }
 
-  void settingsUpdater({ BackupMode backup }) {
+  void settingsUpdater({ BackupMode backup, double goalWeight }) {
     setState(() {
       if (backup != null)
-        _userData.setBackupModeAndSave(backup);
+        _userData.backupMode = backup;
+      if (goalWeight != null)
+        _userData.goalWeight = goalWeight;
+      _userData.save();
     });
   }
 

examples/fitness/lib/settings.dart

@@ -5,20 +5,35 @@
 part of fitness;
 
 typedef void SettingsUpdater({
-  BackupMode backup
+  BackupMode backup,
+  double goalWeight
 });
 
-class SettingsFragment extends Component {
+class SettingsFragment extends StatefulComponent {
 
   SettingsFragment({ this.navigator, this.userData, this.updater });
 
-  final Navigator navigator;
-  final UserData userData;
-  final SettingsUpdater updater;
+  Navigator navigator;
+  UserData userData;
+  SettingsUpdater updater;
+
+  void syncFields(SettingsFragment source) {
+    navigator = source.navigator;
+    userData = source.userData;
+    updater = source.updater;
+  }
 
   void _handleBackupChanged(bool value) {
-    if (updater != null)
-      updater(backup: value ? BackupMode.enabled : BackupMode.disabled);
+    assert(updater != null);
+    updater(backup: value ? BackupMode.enabled : BackupMode.disabled);
+  }
+
+  void _goalWeightChanged(double value) {
+    assert(updater != null);
+    setState(() {
+      optimism = value ? StockMode.optimistic : StockMode.pessimistic;
+    });
+    sendUpdates();
   }
 
   Widget buildToolBar() {
@@ -30,6 +45,64 @@ class SettingsFragment extends Component {
     );
   }
 
+  String get goalWeightText {
+    if (userData.goalWeight == null || userData.goalWeight == 0.0)
+      return "None";
+    else
+      return "${userData.goalWeight}";
+  }
+
+  static final GlobalKey weightGoalKey = new GlobalKey();
+
+  double _goalWeight;
+
+  void _handleGoalWeightChanged(String goalWeight) {
+    // TODO(jackson): Looking for null characters to detect enter key is a hack
+    if (goalWeight.endsWith("\u{0}")) {
+      navigator.pop(double.parse(goalWeight.replaceAll("\u{0}", "")));
+    } else {
+      setState(() {
+        try {
+          _goalWeight = double.parse(goalWeight);
+        } on FormatException {
+          _goalWeight = 0.0;
+        }
+      });
+    }
+  }
+
+  EventDisposition _handleGoalWeightPressed() {
+    showDialog(navigator, (navigator) {
+      return new Dialog(
+        title: new Text("Goal Weight"),
+        content: new Input(
+          key: weightGoalKey,
+          placeholder: 'Goal weight in lbs',
+          keyboardType: KeyboardType_NUMBER,
+          onChanged: _handleGoalWeightChanged
+        ),
+        onDismiss: () {
+          navigator.pop();
+        },
+        actions: [
+          new FlatButton(
+            child: new Text('CANCEL'),
+            onPressed: () {
+              navigator.pop();
+            }
+          ),
+          new FlatButton(
+            child: new Text('SAVE'),
+            onPressed: () {
+              navigator.pop(_goalWeight);
+            }
+          ),
+        ]
+      );
+    }).then((double goalWeight) => updater(goalWeight: goalWeight));
+    return EventDisposition.processed;
+  }
+
   Widget buildSettingsPane() {
     return new Material(
       type: MaterialType.canvas,
@@ -43,7 +116,16 @@ class SettingsFragment extends Component {
                 new Flexible(child: new Text('Back up data to the cloud')),
                 new Switch(value: userData.backupMode == BackupMode.enabled, onChanged: _handleBackupChanged)
               ]
-            )
+            ),
+            new DrawerItem(
+              onPressed: () => _handleGoalWeightPressed(),
+              children: [
+                new Flex([
+                  new Text('Goal Weight'),
+                  new Text(goalWeightText, style: Theme.of(this).text.caption),
+                ], direction: FlexDirection.vertical, alignItems: FlexAlignItems.start)
+              ]
+            ),
           ])
         )
       )