worked on MultiFormatTextBox

MultiTerm.Protocols/Serial/SerialProtocolSettingsViewModel.cs

@@ -67,6 +67,11 @@ public partial class SerialProtocolSettingsViewModel : ProtocolSettingsViewModel
             this.messenger.Send<IUserInterfaceMessage>(new ProtocolSettingsInvalidMessage(nameof(this.DataBits), "Must be 5...8 or 16"));
             return false;
         }
+        if(this.BaudRate < 0)
+        {
+            this.messenger.Send<IUserInterfaceMessage>(new ProtocolSettingsInvalidMessage(nameof(this.BaudRate), "Must be larger than 0"));
+            return false;
+        }
 
         return true;
     }

MultiTerm.Wpf.CustomControl/MultiFormatTextBox/MultiFormatTextBox.cs

@@ -1,5 +1,11 @@
-using System.Windows;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Runtime.CompilerServices;
+using System.Windows;
 using System.Windows.Controls;
+using System.Windows.Input;
+using System.Windows.Media;
 
 namespace MultiTerm.Wpf.CustomControl;
 
@@ -32,10 +38,90 @@ namespace MultiTerm.Wpf.CustomControl;
 ///     <MyNamespace:MultiFormatTextBox/>
 ///
 /// </summary>
-public class MultiFormatTextBox : TextBox
+internal class Format
 {
+    public string Name { get; set; }
+    public Brush BackgroundBrush { get; set; }
+    public Predicate<Key> IsKeyValid { get; set; }
+    public Format(string name, Brush backgroundBrush, Predicate<Key> keyValidator)
+    {
+        this.Name = name;
+        this.BackgroundBrush = backgroundBrush;
+        this.IsKeyValid = keyValidator;
+    }
+    public static List<string> GetListOfNames(IEnumerable<Format> formats)
+    {
+        return formats.Select(item => item.Name).ToList();
+    }
+}
+
+public class MultiFormatTextBox : Control
+{
+    private static readonly List<Format> formats = new()
+    {
+        // character input, accepts all keys
+        new Format("CHAR", Brushes.White, delegate(Key k) { return true; }),
+        // hex input, ignores all keys that are not inbetween 0 and F
+        new Format("HEX", Brushes.Orange, delegate(Key k) { return (k >= Key.D0 && k <= Key.F); }),
+        // binary input, ignores all keys except 0 and 1
+        new Format("BIN", Brushes.AliceBlue, delegate(Key k) { return (k == Key.D0 || k == Key.D1); })
+    };
+
+    private ComboBox comboBox;
+    private RichTextBox richTextBox;
+    private Format currentlySelectedFormat = formats.First();
+
     static MultiFormatTextBox()
     {
         DefaultStyleKeyProperty.OverrideMetadata(typeof(MultiFormatTextBox), new FrameworkPropertyMetadata(typeof(MultiFormatTextBox)));
     }
+
+    public override void OnApplyTemplate()
+    {
+        base.OnApplyTemplate();
+
+        // get comboBox from template
+        var comboBox = GetTemplateChild("comboBox") as ComboBox;
+        if (comboBox != null)
+        {
+            this.comboBox = comboBox;
+            this.comboBox.ItemsSource = Format.GetListOfNames(formats);
+            this.comboBox.SelectedItem = currentlySelectedFormat.Name;
+            this.comboBox.SelectionChanged += ComboBox_SelectionChanged;
+        }
+
+        // get richTextBox from template
+        var richTextBox = GetTemplateChild("richTextBox") as RichTextBox;
+        if (richTextBox != null)
+        {
+            this.richTextBox = richTextBox;
+            this.richTextBox.KeyDown += RichTextBox_KeyDown;
+        }
+
+    }
+
+    private void ComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
+    {
+        // match all formats with the name selected in the combobox
+        var matchingFormats = formats.Where(format => format.Name == (string)this.comboBox!.SelectedItem);
+        // check if exactly one format was matched
+        if(matchingFormats.Count() != 1)
+        {
+            throw new Exception($"{nameof(ComboBox_SelectionChanged)} could not match a correct amount of formats");
+        }
+        // set currently selected format
+        this.currentlySelectedFormat = matchingFormats.First();
+    }
+
+    private void RichTextBox_KeyDown(object sender, KeyEventArgs e)
+    {
+        // guard combobox null
+        if (comboBox == null) throw new Exception($"{nameof(comboBox)} cannot be null");
+
+        // if key is invalid for this format => ignore it (handled = true)
+        if(this.currentlySelectedFormat.IsKeyValid(e.Key) == false)
+        {
+            e.Handled = true;
+        }
+    }
 }

MultiTerm.Wpf.CustomControl/MultiFormatTextBox/MultiFormatTextBox.xaml

@@ -2,11 +2,11 @@
                     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                     xmlns:local="clr-namespace:MultiTerm.Wpf.CustomControl">
     
-    <SolidColorBrush x:Key="TextBox.Static.Border" Color="#FFABAdB3"/>
+    <!--<SolidColorBrush x:Key="TextBox.Static.Border" Color="#FFABAdB3"/>
     <SolidColorBrush x:Key="TextBox.MouseOver.Border" Color="#FF7EB4EA"/>
-    <SolidColorBrush x:Key="TextBox.Focus.Border" Color="#FF569DE5"/>
+    <SolidColorBrush x:Key="TextBox.Focus.Border" Color="#FF569DE5"/>-->
     <Style TargetType="{x:Type local:MultiFormatTextBox}">
-        <Setter Property="Background" Value="{DynamicResource {x:Static SystemColors.WindowBrushKey}}"/>
+        <!--<Setter Property="Background" Value="{DynamicResource {x:Static SystemColors.WindowBrushKey}}"/>
         <Setter Property="BorderBrush" Value="{StaticResource TextBox.Static.Border}"/>
         <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>
         <Setter Property="BorderThickness" Value="1"/>
@@ -15,21 +15,15 @@
         <Setter Property="FocusVisualStyle" Value="{x:Null}"/>
         <Setter Property="AllowDrop" Value="true"/>
         <Setter Property="ScrollViewer.PanningMode" Value="VerticalFirst"/>
-        <Setter Property="Stylus.IsFlicksEnabled" Value="False"/>
+        <Setter Property="Stylus.IsFlicksEnabled" Value="False"/>-->
         <Setter Property="Template">
             <Setter.Value>
                 <ControlTemplate TargetType="{x:Type local:MultiFormatTextBox}">
                     <DockPanel LastChildFill="True">
-                        <ComboBox DockPanel.Dock="Left" x:Name="comboBox" Width="60">
-                            <ComboBoxItem>CHAR</ComboBoxItem>
-                            <ComboBoxItem>HEX</ComboBoxItem>
-                            <ComboBoxItem>BIN</ComboBoxItem>
-                        </ComboBox>
-                        <Border DockPanel.Dock="Right" x:Name="border" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Width="{TemplateBinding Width}" SnapsToDevicePixels="True">
-                            <ScrollViewer x:Name="PART_ContentHost" Focusable="false" HorizontalScrollBarVisibility="Hidden" VerticalScrollBarVisibility="Hidden"/>
-                        </Border>
+                        <ComboBox DockPanel.Dock="Left" x:Name="comboBox" Width="60"></ComboBox>
+                        <RichTextBox DockPanel.Dock="Right" x:Name="richTextBox"></RichTextBox>
                     </DockPanel>
-                    <ControlTemplate.Triggers>
+                    <!--<ControlTemplate.Triggers>
                         <Trigger Property="IsEnabled" Value="false">
                             <Setter Property="Opacity" TargetName="border" Value="0.56"/>
                         </Trigger>
@@ -39,18 +33,13 @@
                         <Trigger Property="IsKeyboardFocused" Value="true">
                             <Setter Property="BorderBrush" TargetName="border" Value="{StaticResource TextBox.Focus.Border}"/>
                         </Trigger>
-                    </ControlTemplate.Triggers>
+                    </ControlTemplate.Triggers>-->
                 </ControlTemplate>
             </Setter.Value>
         </Setter>
-        <Style.Triggers>
-            <MultiTrigger>
-                <MultiTrigger.Conditions>
-                    <Condition Property="IsInactiveSelectionHighlightEnabled" Value="true"/>
-                    <Condition Property="IsSelectionActive" Value="false"/>
-                </MultiTrigger.Conditions>
-                <Setter Property="SelectionBrush" Value="{DynamicResource {x:Static SystemColors.InactiveSelectionHighlightBrushKey}}"/>
-            </MultiTrigger>
-        </Style.Triggers>
+        <!--<Setter Property="MinWidth" Value="10"/>
+        <Style.BasedOn>
+            <StaticResource ResourceKey="{x:Type RichTextBox}"/>
+        </Style.BasedOn>-->
     </Style>
 </ResourceDictionary>

MultiTerm.Wpf/ValueConverters/IntToStringConverter.cs

@@ -17,6 +17,14 @@ public class IntToStringConverter : IValueConverter
     {
         // guard type
         if (value is not string stringVal) { throw new ArgumentException("Can only convert from string value"); }
-        return int.Parse(stringVal);
+
+        // try parsing to int
+        int parsedVal;
+        if(int.TryParse(stringVal, out parsedVal) == false)
+        {
+            // error
+            parsedVal = -1;
+        }
+        return parsedVal;
     }
 }