Fix the projections not loading if any item type was left unused.

lib/pages/report.dart

@@ -1,4 +1,6 @@
 // Flutter
+import 'dart:async';
+
 import 'package:flutter/material.dart';
 import '/models/item_type.dart';
 
@@ -13,11 +15,11 @@ import '/models/tracked_item.dart';
 ///   - Fix bug where editing an item does not reflect immediately when returning to Reports page.
 ///     - Currently reflects after going back to Reports the 2nd time.
 
-double _assetTotal = 0,
-    _expenseMonthly = 0,
-    _expenseYearly = 0,
-    _incomeMonthly = 0,
-    _incomeYearly = 0;
+double _assetTotal = -1,
+    _expenseMonthly = -1,
+    _expenseYearly = -1,
+    _incomeMonthly = -1,
+    _incomeYearly = -1;
 
 class ProjectionPage extends StatefulWidget {
   const ProjectionPage({
@@ -29,67 +31,111 @@ class ProjectionPage extends StatefulWidget {
 }
 
 class _ProjectionPageState extends State<ProjectionPage> {
+  bool _showProjections = true;
+
+  @override
+  void dispose() {
+    _assetTotal = -2;
+    _expenseMonthly = -2;
+    _expenseYearly = -2;
+    _incomeMonthly = -2;
+    _incomeYearly = -2;
+    super.dispose();
+  }
+
   @override
   Widget build(BuildContext context) {
     // Summaries for display as well as calculation of totals for projections.
     Widget expenseSummary = SummaryCardForTotals(
       list: DatabaseHelper.instance.getExpenses(),
-      summaryTypeLabel: ItemType.expense.title,
+      itemType: ItemType.expense,
     );
     Widget incomeSummary = SummaryCardForTotals(
       list: DatabaseHelper.instance.getIncomes(),
-      summaryTypeLabel: ItemType.income.title,
+      itemType: ItemType.income,
     );
     Widget assetSummary = SummaryCardForTotals(
       list: DatabaseHelper.instance.getAssets(),
-      summaryTypeLabel: ItemType.asset.title,
+      itemType: ItemType.asset,
     );
 
     // Calculations for the projections.
-    double oneMonth = _assetTotal + _incomeMonthly - _expenseMonthly,
-        threeMonths = _assetTotal + (3 * (_incomeMonthly - _expenseMonthly)),
-        sixMonths = _assetTotal + (6 * (_incomeMonthly - _expenseMonthly)),
-        oneYear = _assetTotal + (_incomeYearly - _expenseYearly),
-        twoYears = _assetTotal + (2 * (_incomeYearly - _expenseYearly)),
-        fiveYears = _assetTotal + (5 * (_incomeYearly - _expenseYearly));
+    Widget projections;
+    if (_assetTotal < 0 ||
+        _incomeMonthly < 0 ||
+        _incomeYearly < 0 ||
+        _expenseMonthly < 0 ||
+        _expenseYearly < 0) {
+      _showProjections = false;
 
-    // Widgets to show the projections.
-    Widget proj1 = SummaryCard(
-      name: "One month from now...",
-      leftText: "",
-      middleText: oneMonth.toStringAsFixed(2),
-      rightText: "",
-    );
-    Widget proj2 = SummaryCard(
-      name: "Three months from now...",
-      leftText: "",
-      middleText: threeMonths.toStringAsFixed(2),
-      rightText: "",
-    );
-    Widget proj3 = SummaryCard(
-      name: "Half a year from now...",
-      leftText: "",
-      middleText: sixMonths.toStringAsFixed(2),
-      rightText: "",
-    );
-    Widget proj4 = SummaryCard(
-      name: "One year from now...",
-      leftText: "",
-      middleText: oneYear.toStringAsFixed(2),
-      rightText: "",
-    );
-    Widget proj5 = SummaryCard(
-      name: "Two years from now...",
-      leftText: "",
-      middleText: twoYears.toStringAsFixed(2),
-      rightText: "",
-    );
-    Widget proj6 = SummaryCard(
-      name: "Five years from now...",
-      leftText: "",
-      middleText: fiveYears.toStringAsFixed(2),
-      rightText: "",
-    );
+      projections = Center(
+        child: SizedBox(
+          child: CircularProgressIndicator(),
+        ),
+      );
+
+      Future.delayed(Duration(seconds: 1), () {
+        setState(() {
+          _showProjections = true;
+        });
+      });
+    } else {
+      double oneMonth = _assetTotal + _incomeMonthly - _expenseMonthly,
+          threeMonths = _assetTotal + (3 * (_incomeMonthly - _expenseMonthly)),
+          sixMonths = _assetTotal + (6 * (_incomeMonthly - _expenseMonthly)),
+          oneYear = _assetTotal + (_incomeYearly - _expenseYearly),
+          twoYears = _assetTotal + (2 * (_incomeYearly - _expenseYearly)),
+          fiveYears = _assetTotal + (5 * (_incomeYearly - _expenseYearly));
+
+      // Widgets to show the projections.
+      Widget proj1 = SummaryCard(
+        name: "One month from now...",
+        leftText: "",
+        middleText: oneMonth.toStringAsFixed(2),
+        rightText: "",
+      );
+      Widget proj2 = SummaryCard(
+        name: "Three months from now...",
+        leftText: "",
+        middleText: threeMonths.toStringAsFixed(2),
+        rightText: "",
+      );
+      Widget proj3 = SummaryCard(
+        name: "Half a year from now...",
+        leftText: "",
+        middleText: sixMonths.toStringAsFixed(2),
+        rightText: "",
+      );
+      Widget proj4 = SummaryCard(
+        name: "One year from now...",
+        leftText: "",
+        middleText: oneYear.toStringAsFixed(2),
+        rightText: "",
+      );
+      Widget proj5 = SummaryCard(
+        name: "Two years from now...",
+        leftText: "",
+        middleText: twoYears.toStringAsFixed(2),
+        rightText: "",
+      );
+      Widget proj6 = SummaryCard(
+        name: "Five years from now...",
+        leftText: "",
+        middleText: fiveYears.toStringAsFixed(2),
+        rightText: "",
+      );
+
+      projections = Column(
+        children: [
+          proj1,
+          proj2,
+          proj3,
+          proj4,
+          proj5,
+          proj6,
+        ],
+      );
+    }
 
     // Return all of the UI elements.
     return ListView(
@@ -99,12 +145,7 @@ class _ProjectionPageState extends State<ProjectionPage> {
         incomeSummary,
         assetSummary,
         TitleCard(title: "Projections"),
-        proj1,
-        proj2,
-        proj3,
-        proj4,
-        proj5,
-        proj6,
+        projections,
       ],
     );
   }
@@ -114,14 +155,16 @@ class SummaryCardForTotals extends StatelessWidget {
   const SummaryCardForTotals({
     super.key,
     required this.list,
-    required this.summaryTypeLabel,
+    required this.itemType,
   });
 
   final Future<List<TrackedItem>> list;
-  final String summaryTypeLabel;
+  final ItemType itemType;
 
   @override
   Widget build(BuildContext context) {
+    String summaryTypeLabel = itemType.title.toString();
+
     return FutureBuilder<List<TrackedItem>>(
         future: list,
         builder: (
@@ -134,12 +177,9 @@ class SummaryCardForTotals extends StatelessWidget {
 
           // Calculate the total fields based on item type.
           double dailyTotal = 0, monthlyTotal = 0, yearlyTotal = 0;
-          ItemType? itemType;
           for (TrackedItem e in snapshot.data!) {
-            if (itemType == null) {
-              itemType = e.type!;
-            } else if (itemType != e.type) {
-              throw "List in SummaryCardForTotals has multiple item types, abort!";
+            if (e.type != itemType) {
+              throw "List in SummaryCardForTotals has incorrect item types, abort!";
             }
 
             if (e.type == ItemType.asset) {
@@ -153,9 +193,6 @@ class SummaryCardForTotals extends StatelessWidget {
 
           /* Load page variables based on calculated totals. */
           switch (itemType) {
-            case null:
-              break;
-
             case ItemType.asset:
               _assetTotal = monthlyTotal;
               break;

lib/pages/tracked_item.dart

@@ -337,6 +337,7 @@ class _TrackedItemInputDialogState extends State<TrackedItemInputDialog> {
                 : Text("Edit ${_type!.title}"),
           ),
           content: FutureBuilder<List<Expense>>(
+              // TODO / TBD -- This should no longer only be Expenses.
               future: DatabaseHelper.instance.getExpenses(),
               builder: (BuildContext context,
                   AsyncSnapshot<List<Expense>> snapshot) {

pubspec.yaml

@@ -1,7 +1,7 @@
 name: expense_tracker
 description: Track recurring expenses against income and liquid assets.
 publish_to: 'none'
-version: 0.1.1
+version: 0.1.3
 
 environment:
   sdk: ^3.6.1