Show the currency in the UI and the reports

docs/AccountingData.xsd

@@ -10,7 +10,15 @@
             <xs:sequence>
               <xs:element name="Name" type="xs:string" />
               <xs:element name="Location" type="xs:string" />
-              <xs:element name="Currency" type="xs:string" />
+              <xs:element name="Currency">
+                <xs:complexType>
+                  <xs:simpleContent>
+                    <xs:extension base="xs:string">
+                      <xs:attribute name="Show" default="false" type="xs:boolean" />
+                    </xs:extension>
+                  </xs:simpleContent>
+                </xs:complexType>
+              </xs:element>
               <xs:element name="BookingTemplates" minOccurs="0" maxOccurs="1">
                 <xs:complexType>
                   <xs:sequence minOccurs="1" maxOccurs="unbounded">

samples/sample.acml

@@ -3,7 +3,7 @@
   <Setup>
     <Name>Demo</Name>
     <Location>World</Location>
-    <Currency>€</Currency>
+    <Currency Show="true">€</Currency>
     <Reports />
     <Behavior />
   </Setup>
@@ -26,17 +26,17 @@
       <Account ID="990" Name="Carryforward" Type="Carryforward" />
     </AccountGroup>
   </Accounts>
-  <Journal Year="2024" DateStart="20240101" DateEnd="20241231">
-    <Booking Date="20240101" ID="1" Followup="true" Opening="true">
+  <Journal Year="2026" DateStart="20260101" DateEnd="20261231">
+    <Booking Date="20260101" ID="1" Followup="true" Opening="true">
       <Debit Value="10000" Account="100" Text="Opening value 1" />
       <Credit Value="10000" Account="990" Text="Opening value 1" />
     </Booking>
-    <Booking Date="20240115" ID="2">
+    <Booking Date="20260115" ID="2">
       <Debit Value="1000" Account="600" Text="Apples" />
       <Debit Value="2500" Account="610" Text="Shoes" />
       <Credit Value="3500" Account="100" Text="My Supermarket - Shopping Reference 4711" />
     </Booking>
-    <Booking Date="20240128" ID="3">
+    <Booking Date="20260128" ID="3">
       <Debit Value="55000" Account="100" Text="My Company - Salary" />
       <Credit Value="40000" Account="400" Text="Monthly salary" />
       <Credit Value="15000" Account="400" Text="Annual extra salary" />

src/SimpleAccounting/Extensions/NumberExtensions.cs

@@ -22,6 +22,17 @@ public static string FormatCurrency(this long value)
         return (value / ConversionFactor).FormatCurrency();
     }
 
+    /// <summary>
+    ///     Formats the specified value as currency including the specified currency symbol.
+    ///     The position of the symbol is defined by the specified culture.
+    /// </summary>
+    public static string FormatCurrency(this double value, string currencySymbol, CultureInfo culture)
+    {
+        var format = (NumberFormatInfo)culture.NumberFormat.Clone();
+        format.CurrencySymbol = currencySymbol;
+        return value.ToString("C2", format);
+    }
+
     public static long ToModelValue(this double value)
     {
         return (long)Math.Round(value * ConversionFactor);

src/SimpleAccounting/Model/AccountingData.Extensions.cs

@@ -35,11 +35,11 @@
     }
 
     [XmlAttribute("schemaLocation", Namespace = "http://www.w3.org/2001/XMLSchema-instance")]
     [SuppressMessage(
         "Minor Code Smell",
         "S100:Methods and properties should be named in PascalCase",
         Justification = "fixed name")]
     [SuppressMessage("ReSharper", "RedundantCheckBeforeAssignment", Justification = "FP")]
     public string xsiSchemaLocation
     {
         get => this.schema;
@@ -78,7 +78,7 @@
         };
         return new AccountingData
         {
-            Setup = new AccountingDataSetup { Currency = "€" },
+            Setup = new AccountingDataSetup(),
             Accounts = [new AccountingDataAccountGroup { Name = "Default", Account = defaultAccounts }],
             Journal = [accountJournal]
         };
@@ -216,9 +216,10 @@
 
     private bool IntroduceCurrency()
     {
-        if (string.IsNullOrWhiteSpace(this.Setup.Currency))
+        if (string.IsNullOrWhiteSpace(this.Setup.Currency?.Value))
         {
-            this.Setup.Currency = "€";
+            this.Setup.Currency ??= new AccountingDataSetupCurrency();
+            this.Setup.Currency.Value = AccountingDataSetupCurrency.DefaultValue;
             return true;
         }
 
@@ -263,10 +264,20 @@
     {
         this.behaviorField = new AccountingDataSetupBehavior();
         this.reportsField = new AccountingDataSetupReports();
-        this.Currency = "€";
+        this.currencyField = new AccountingDataSetupCurrency { Value = AccountingDataSetupCurrency.DefaultValue };
     }
 }
 
+public partial class AccountingDataSetupCurrency
+{
+    internal const string DefaultValue = "€";
+
+    /// <summary>
+    ///     Gets the currency symbol to be shown at the values, or <c>null</c> if the currency should not be shown.
+    /// </summary>
+    internal string? DisplaySymbol => this.Show ? this.Value : null;
+}
+
 public partial class AccountingDataSetupBehavior
 {
     /// <summary>

src/SimpleAccounting/Model/AccountingData.xsd

@@ -10,7 +10,15 @@
             <xs:sequence>
               <xs:element name="Name" type="xs:string" />
               <xs:element name="Location" type="xs:string" />
-              <xs:element name="Currency" type="xs:string" />
+              <xs:element name="Currency">
+                <xs:complexType>
+                  <xs:simpleContent>
+                    <xs:extension base="xs:string">
+                      <xs:attribute name="Show" default="false" type="xs:boolean" />
+                    </xs:extension>
+                  </xs:simpleContent>
+                </xs:complexType>
+              </xs:element>
               <xs:element name="BookingTemplates" minOccurs="0" maxOccurs="1">
                 <xs:complexType>
                   <xs:sequence minOccurs="1" maxOccurs="unbounded">

src/SimpleAccounting/Presentation/AccountJournalViewModel.cs

@@ -36,6 +36,13 @@ public AccountJournalItemViewModel? SelectedItem
         }
     }
 
+    public string? DisplayCurrency => this.projectData.Storage.Setup.Currency.DisplaySymbol;
+
+    public void RefreshCurrency()
+    {
+        this.NotifyOfPropertyChange(nameof(this.DisplayCurrency));
+    }
+
     public void Rebuild(ulong accountNumber)
     {
         this.Items.Clear();