introduced TextBox in MultiFormatDataView to improve performance when only Characters are displayed,

changed newline characters display to unicode control symbols

MultiTerm.Protocols/Model/ExtendedChar.cs

@@ -49,23 +49,29 @@ public partial class ExtendedChar
     {
         string characterString;
 
-        if (char.IsWhiteSpace(this.Character))
+        // character is ASCII encoded and is a control sequence
+        if (char.IsAscii(this.Character) && this.Character <= '\x001F')
         {
-            characterString = this.Character switch
+            // conver to unicode Control Picture (see https://en.wikipedia.org/wiki/Control_Pictures)
-            {
+            characterString = ((char)('\u2400' + this.Character)).ToString();
-                '\t' => "\\t",
+
-                ' '  => " ",
+            // TODO Remove
-                '\n' => "\\n",
+            //characterString = this.Character switch
-                '\r' => "\\r",
+            //{
-                '\v' => "\\v",
+            //    '\t' => "\\t",
-                '\f' => "\\f",
+            //    ' '  => " ",
-                _ => this.Character.ToString()
+            //    '\n' => "\u240A",
-            };
+            //    '\r' => "\u240D",
-        }
+            //    '\v' => "\\v",
-        else if (char.IsControl(this.Character))
+            //    '\f' => "\\f",
-        {
+            //    _ => this.Character.ToString()
-            characterString = "<CTRL>";
+            //};
         }
+        // TODO Remove
+        //else if (char.IsControl(this.Character))
+        //{
+        //    characterString = "<CTRL>";
+        //}
         else
         {
             characterString = this.Character.ToString();

MultiTerm.Wpf.CustomControl/MultiFormatDataView/MultiFormatDataView.cs

@@ -6,6 +6,9 @@ using System.ComponentModel;
 using System.Windows;
 using System.Windows.Controls;
 using System.Windows.Data;
+using System.Linq;
+using MultiTerm.Wpf.CustomControl.ValueConverter;
+using System.Diagnostics.Metrics;
 
 namespace MultiTerm.Wpf.CustomControl;
 
@@ -15,7 +18,9 @@ public class MultiFormatDataView : Control
     private const string itemsControlTemplateName = "itemsControl";
     private const string buttonClearTemplateName = "btnClear";
     private const string selectorTemplateName = "comboBoxSelector";
+    private const string textBoxCharOnlyViewTemplateName = "textBoxCharactersOnlyView";
     private ListBox? itemsControl;
+    private TextBox? tbCharOnlyView;
 
     #region Dependency Properties
     public static readonly DependencyProperty DataSourceProperty =
@@ -183,22 +188,62 @@ public class MultiFormatDataView : Control
         {
             button.Click += OnClearButtonClicked; ;
         }
+
+        // get textBox from template, ignore if it does not exist
+        if (GetTemplateChild(textBoxCharOnlyViewTemplateName) is TextBox tb)
+        {
+            this.tbCharOnlyView = tb;
+            this.tbCharOnlyView.SelectionChanged += TextBoxCharOnlyView_SelectionChanged;
+        }
     }
+
     private static void OnDataSourcePropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
     {
         // extract instance and guard null
         if (d is not MultiFormatDataView mfdv) { return; }
-        // extract instance of new Value and guard null
-        if (e.NewValue is not IEnumerable enumerable) { return; }
 
-        // check if enumerable items are all of correct type
+        // extract instance of new Value and check if correct type
-        foreach (var item in enumerable)
+        if (e.NewValue is not IEnumerable<DataViewModel> newDataSource)
         {
-            if (item is not DataViewModel) 
+            throw new ArgumentException($"{nameof(MultiFormatDataView)}: {nameof(DataSourceProperty)} must be of type {nameof(IEnumerable<DataViewModel>)}");
-            { throw new ArgumentException($"{nameof(DataSourceProperty)} must be of type {nameof(DataViewModel)}"); }
         }
 
-        // add group property
+        // TODO REMOVE
+        //// validate that no characters were removed
+        //if(oldDataSource != null && oldDataSource.Count() > newDataSource.Count())
+        //{
+        //    throw new NotImplementedException($"{nameof(MultiFormatDataView)} cannot handle removing single items from DataSource. " +
+        //        $"Only adding and clearing ({nameof(DataSourceProperty)} = null) are supported.");
+        //}
+
+        //// iterate through data, adding content to textbox
+        //int prevCounter = newDataSource.First().LineIdentifier;
+        //for(int i = 0; i < newDataSource.Count(); i++)
+        //{
+        //    DataViewModel item = newDataSource.ElementAt(i);
+        //    DataViewModel? oldItem = oldDataSource?.ElementAtOrDefault(i);
+
+        //    // if old item at this position exists and it equals the new item => skip
+        //    if(oldItem != null && oldItem.Equals(item))
+        //    {
+        //        continue;
+        //    }
+
+        //    // new item found: add it as content to textbox
+        //    if (mfdv.tbCharOnlyView != null) 
+        //    {
+        //        // newline if previous counter is lower than this
+        //        if (item.LineIdentifier > prevCounter)
+        //        {
+        //            mfdv.tbCharOnlyView.Text += "\n";
+        //            prevCounter = item.LineIdentifier;
+        //        }
+        //        // add character (text)
+        //        mfdv.tbCharOnlyView.Text += item.DisplayStringUtf16;
+        //    }
+        //}
+
+        // add group property to support grouping of VirtualizingWrapPanel
         CollectionView view = (CollectionView)CollectionViewSource.GetDefaultView(e.NewValue);
         PropertyGroupDescription groupDescription = new(nameof(DataViewModel.LineIdentifier));
         view.GroupDescriptions.Add(groupDescription);
@@ -217,6 +262,9 @@ public class MultiFormatDataView : Control
         // if there are no changes => return
         if (e.AddedItems.Count <= 0 && e.RemovedItems.Count <= 0) { return; }
 
+        // if there is something selected in the textbox => clear selection first
+        if (this.tbCharOnlyView != null && this.tbCharOnlyView.SelectionLength > 0) { this.tbCharOnlyView.Select(0, 0); }
+
         // otherwise update internal list
         foreach (DataViewModel item in e.RemovedItems)
         {
@@ -228,6 +276,35 @@ public class MultiFormatDataView : Control
         }
     }
 
+    private void TextBoxCharOnlyView_SelectionChanged(object sender, RoutedEventArgs e)
+    {
+        var newSelection = new List<DataViewModel>();
+        int selectionStartIndex = this.tbCharOnlyView!.SelectionStart;
+        // extract text from the beginning to the start of the selected text
+        var textFromBeginningToStartOfSelection = this.tbCharOnlyView!.Text.Substring(0, selectionStartIndex);
+        // count amount of manually introduced newline sequences in this text section (these to not exist in the data source!)
+        var foundManuallyIntroducedNewlineSequences = textFromBeginningToStartOfSelection.Count((x) => x == DataViewModelToStringConverter.NewlineSequence);
+        // convert datasource
+        var collection = ((IEnumerable<DataViewModel>)this.DataSource);
+
+        // iterate through length of selection
+        for (int i = 0; i < this.tbCharOnlyView!.SelectionLength; i++)
+        {
+            // subtracting the counted newline sequences and adding i (length)
+            int elementPositionInCollection = selectionStartIndex - foundManuallyIntroducedNewlineSequences + i;
+            // add element to new selection list
+            newSelection.Add(collection.ElementAt(elementPositionInCollection));
+            // next item does not exist => break loop
+            if(collection.ElementAtOrDefault(elementPositionInCollection + 1) == null)
+            {
+                break;
+            }
+        }
+
+        // update property
+        this.SelectedItems = newSelection;
+    }
+
     private static void OnSelectedItemsPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
     {
         // NOP

MultiTerm.Wpf.CustomControl/MultiFormatDataView/MultiFormatDataView.xaml

@@ -3,13 +3,19 @@
                     xmlns:local="clr-namespace:MultiTerm.Wpf.CustomControl"
                     xmlns:vm="clr-namespace:MultiTerm.Core.ViewModel;assembly=MultiTerm.Core"
                     xmlns:wpftk="clr-namespace:WpfToolkit.Controls;assembly=VirtualizingWrapPanel"
+                    xmlns:conv="clr-namespace:MultiTerm.Wpf.CustomControl.ValueConverter"
                     xmlns:sys="clr-namespace:System;assembly=mscorlib">
 
     <Style TargetType="{x:Type local:MultiFormatDataView}">
         <Style.Resources>
+            <!-- Brushes -->
             <SolidColorBrush x:Key="CHAR_Background" Color="#B4FFFF"/>
             <SolidColorBrush x:Key="HEX_Background" Color="#C8C8FF"/>
             <SolidColorBrush x:Key="BIN_Background" Color="#B4FFB4"/>
+            <!-- Value Converters -->
+            <conv:DataViewModelToStringConverter x:Key="DataViewModelToStringConverter"/>
+            
+            
             <DataTemplate x:Key="dataContainerTemplate" DataType="vm:DataViewModel">
                 <DataTemplate.Resources>
                     <!-- Styling for all labels (data items) -->
@@ -152,8 +158,37 @@
                                 <ColumnDefinition Width="*"/>
                             </Grid.ColumnDefinitions>
 
+                            <!-- Simple Text View -->
+                            <TextBox Name="textBoxCharactersOnlyView"
+                                Grid.Column="0" Grid.Row="0" Grid.RowSpan="2"
+                                IsReadOnly="True"
+                                Text="{Binding Path=DataSource, RelativeSource={RelativeSource TemplatedParent},
+                                    Mode=OneWay, UpdateSourceTrigger=PropertyChanged,  
+                                    Converter={StaticResource ResourceKey=DataViewModelToStringConverter}}">
+                                <!--Text="{TemplateBinding DataSource, Converter={StaticResource ResourceKey=DataViewModelToStringConverter}}"-->
+                                
+                                <!-- Show only when other checkboxes than "Characters" is checked -->
+                                <TextBox.Style>
+                                    <Style TargetType="TextBox">
+                                        <Setter Property="Visibility" Value="Collapsed"/>
+                                        <Style.Triggers>
+                                            <DataTrigger Binding="{Binding ElementName=cbCharacter,Path=IsChecked}" Value="True">
+                                                <Setter Property="Visibility" Value="Visible"/>
+                                            </DataTrigger>
+                                            <DataTrigger Binding="{Binding ElementName=cbBin,Path=IsChecked}" Value="True">
+                                                <Setter Property="Visibility" Value="Collapsed"/>
+                                            </DataTrigger>
+                                            <DataTrigger Binding="{Binding ElementName=cbHex,Path=IsChecked}" Value="True">
+                                                <Setter Property="Visibility" Value="Collapsed"/>
+                                            </DataTrigger>
+                                        </Style.Triggers>
+                                    </Style>
+                                </TextBox.Style>
 
-                            <!-- Main Items Control -->
+                            </TextBox>
+                            
+                            
+                            <!-- MultiFormat Items Control -->
                             <ListView Name="itemsControl"
                                 Grid.Column="0" Grid.Row="0" Grid.RowSpan="2"
                                 ItemsSource="{TemplateBinding DataSource}" 
@@ -167,6 +202,21 @@
                                 ItemTemplate="{StaticResource dataContainerTemplate}"
                                 SelectionMode="Extended">
 
+                                <!-- Hide when only "Characters" checkbox is checked -->
+                                <ListView.Style>
+                                    <Style TargetType="ListView">
+                                        <Setter Property="Visibility" Value="Collapsed"/>
+                                        <Style.Triggers>
+                                            <DataTrigger Binding="{Binding ElementName=cbBin,Path=IsChecked}" Value="True">
+                                                <Setter Property="Visibility" Value="Visible"/>
+                                            </DataTrigger>
+                                            <DataTrigger Binding="{Binding ElementName=cbHex,Path=IsChecked}" Value="True">
+                                                <Setter Property="Visibility" Value="Visible"/>
+                                            </DataTrigger>
+                                        </Style.Triggers>
+                                    </Style>
+                                </ListView.Style>
+
                                 <!-- TEMP possible starting point for multiple boxes per item -->
                                 <!--<ListView.ItemTemplate>
                                     <DataTemplate>

MultiTerm.Wpf.CustomControl/ValueConverter/DataViewModelToStringConverter.cs

@@ -0,0 +1,62 @@
+using MultiTerm.Core.ViewModel;
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
+using System.Windows.Data;
+
+namespace MultiTerm.Wpf.CustomControl.ValueConverter;
+
+
+[ValueConversion(typeof(IEnumerable<DataViewModel>), typeof(string))]
+public class DataViewModelToStringConverter : IValueConverter
+{
+    /// <summary>
+    /// Newline Sequence that is introduced whenever a new line begins in the DataViewModel.
+    /// </summary>
+    public static readonly char NewlineSequence = '\n';
+
+    /// <summary>
+    /// Convert from IEnumerable<DataViewModel> to string
+    /// </summary>
+    /// <param name="value"></param>
+    /// <param name="targetType"></param>
+    /// <param name="parameter"></param>
+    /// <param name="culture"></param>
+    /// <returns></returns>
+    /// <exception cref="NotImplementedException"></exception>
+    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+    {
+        // guard null
+        if(value is null) { return string.Empty; }
+
+        // guard type
+        if (value is not IEnumerable<DataViewModel> enumerable) { throw new ArgumentException($"Can only convert from {nameof(IEnumerable<DataViewModel>)} value"); }
+
+        string returnString = string.Empty;
+
+        // iterate through data, adding content to textbox
+        int prevCounter = enumerable.First().LineIdentifier;
+        for (int i = 0; i < enumerable.Count(); i++)
+        {
+            DataViewModel item = enumerable.ElementAt(i);
+
+            // newline if previous counter is lower than this
+            if (item.LineIdentifier > prevCounter)
+            {
+                returnString += NewlineSequence;
+                prevCounter = item.LineIdentifier;
+            }
+
+            // add character (text)
+            returnString += item.DisplayStringUtf16;
+        }
+
+        return returnString;
+    }
+
+    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+    {
+        throw new NotImplementedException();
+    }
+}