implemented first version of send history,

implemented IHistoryElement, StringHistoryElement,
ICloneable for MultiFormatString,
fixed MultiFormatTextBox not resetting when overwritten

MultiTerm.Core/Model/IHistoryElement.cs

@@ -0,0 +1,14 @@
+namespace MultiTerm.Core.Model;
+
+/// <summary>
+/// Represents an element of a history.
+/// Required to have a common <see cref="DisplayText"/> property to access.
+/// Must also implement <see cref="ICloneable"/> in order to clone the object before saving it to the history.
+/// </summary>
+public interface IHistoryElement : ICloneable
+{
+    /// <summary>
+    /// Displayable text of this element.
+    /// </summary>
+    string DisplayText { get; }
+}

MultiTerm.Core/Model/MultiFormatString.cs

@@ -7,11 +7,18 @@ namespace MultiTerm.Core.Model;
 /// <summary>
 /// A string that contains symbols of multiple formats such as a standard character as well as hexadecimal or binary parts.
 /// </summary>
-public class MultiFormatString: ObservableCollection<IFormattedCharacter>
+public class MultiFormatString: ObservableCollection<IFormattedCharacter>, IHistoryElement, ICloneable
 {
     private const int charsPerHexBundle = 2;
     private const int charsPerBinBundle = 8;
 
+    #region IHistoryElement implementation
+    public string DisplayText => this.ToAsciiEncodedString();
+    #endregion
+
+    public MultiFormatString() { }
+    public MultiFormatString(IEnumerable<IFormattedCharacter> collection) : base(collection) { }
+
     #region Insertion / Removal of Characters
     /// <summary>
     /// Inserts item at given index after checking if its valid using <see cref="ValidateValue(FormatType, string)"/>.
@@ -341,5 +348,13 @@ public class MultiFormatString: ObservableCollection<IFormattedCharacter>
         var bytes = GetBytesFromString(binaryString, 2, charsPerBinBundle);
         return Encoding.ASCII.GetString(bytes);
     }
+
+    #endregion
+
+    #region ICloneable implementation
+    public object Clone()
+    {
+        return new MultiFormatString(this);
+    }
     #endregion
 }

MultiTerm.Core/Model/StringHistoryElement.cs

@@ -0,0 +1,23 @@
+namespace MultiTerm.Core.Model;
+
+/// <summary>
+/// Generic history element, which allows to use a string as history element.
+/// </summary>
+public class StringHistoryElement : IHistoryElement, ICloneable
+{
+    public string Text { get; }
+
+    public string DisplayText => this.Text;
+
+    public StringHistoryElement(string text)
+    {
+        Text = text;
+    }
+
+    #region ICloneable implementation
+    public object Clone()
+    {
+        return this.MemberwiseClone();
+    }
+    #endregion
+}

MultiTerm.Core/ViewModel/ConsoleViewModel.cs

@@ -3,6 +3,7 @@ using Common.Logging;
 using CommunityToolkit.Mvvm.ComponentModel;
 using CommunityToolkit.Mvvm.Input;
 using CommunityToolkit.Mvvm.Messaging;
+using MultiTerm.Core.Model;
 using MultiTerm.Core.Types;
 using MultiTerm.Protocols.Model;
 using System.Text;
@@ -76,11 +77,20 @@ public partial class ConsoleViewModel : TerminalViewModel
         // send
         if (this.SendToCommunicationProtocol(encodedBytes))
         {
+            // add to history
+            this.AddToSendHistory(new StringHistoryElement(this.SendableMessage));
             // clear if sending was successful
             this.SendableMessage = string.Empty;
         }
     }
 
+    protected override void HandleInsertElementFromHistory(object element)
+    {
+        if(element is not StringHistoryElement elementString) { throw new Exception($"'{HandleInsertElementFromHistory}()' in {nameof(ConsoleViewModel)} got wrong type of element. Got Type: {element.GetType()}"); }
+        // overwrite sendable message with history element
+        this.SendableMessage = elementString.Text;
+    }
+
     /// <summary>
     /// Command to clear the data that was received.
     /// </summary>

MultiTerm.Core/ViewModel/SendReceiveViewModel.cs

@@ -53,11 +53,21 @@ public partial class SendReceiveViewModel : TerminalViewModel
         // send data
         if (this.SendToCommunicationProtocol(this.SendableData.GetBytes()))
         {
+            // add to history
+            this.AddToSendHistory(this.SendableData);
             // clear textbox if send was successful
             this.SendableData.Clear();
         }
     }
 
+    protected override void HandleInsertElementFromHistory(object element)
+    {
+        if(element is not MultiFormatString mfs) { throw new Exception($"'{HandleInsertElementFromHistory}()' in {nameof(SendReceiveViewModel)} got wrong type of element. Got Type: {element.GetType()}"); }
+
+        // overwrite
+        this.SendableData = mfs;
+    }
+
     public override void DisplayNewReceivedData(IEnumerable<ExtendedByte> newData)
     {
         this.ReceivedData!.HandleNewData(newData);

MultiTerm.Core/ViewModel/TerminalViewModel.cs

@@ -4,11 +4,13 @@ using Common.Messaging;
 using CommunityToolkit.Mvvm.ComponentModel;
 using CommunityToolkit.Mvvm.Input;
 using CommunityToolkit.Mvvm.Messaging;
+using MultiTerm.Core.Model;
 using MultiTerm.Core.Types;
 using MultiTerm.Protocols;
 using MultiTerm.Protocols.Model;
 using MultiTerm.Protocols.Types;
 using System.Collections.Concurrent;
+using System.Collections.ObjectModel;
 
 namespace MultiTerm.Core.ViewModel;
 
@@ -94,6 +96,11 @@ public abstract partial class TerminalViewModel : ObservableObject, ITerminalVie
     [ObservableProperty]
     private string communicationProtocolLongIdentifier = string.Empty;
 
+    /// <summary>
+    /// Collection of sent messages as <see cref="IHistoryElement"/>.
+    /// </summary>
+    [ObservableProperty]
+    ObservableCollection<IHistoryElement> sentMessagesHistory = new();
     #endregion
 
 
@@ -331,4 +338,39 @@ public abstract partial class TerminalViewModel : ObservableObject, ITerminalVie
     }
     #endregion
 
+    #region History
+    /// <summary>
+    /// Creates a clone of the passed element and saves that to the <see cref="SentMessagesHistory"/>.
+    /// </summary>
+    /// <param name="element">element to add to the history</param>
+    protected void AddToSendHistory(IHistoryElement element)
+    {
+        // shallow copy of element (so that element can be changed externally)
+        var copy = (IHistoryElement)element.Clone();
+
+        // add to list
+        this.SentMessagesHistory.Add(copy);
+    }
+
+    /// <summary>
+    /// Shall handle the insertion of an element from the <see cref="SentMessagesHistory"/> 
+    /// into the current sendable message area.
+    /// </summary>
+    /// <param name="element">copy of element as object</param>
+    protected abstract void HandleInsertElementFromHistory(object element);
+
+    /// <summary>
+    /// Allows to insert an element from the history into the current send message.
+    /// Creates a copy of the object, so it can be changed externally.
+    /// </summary>
+    [RelayCommand]
+    public void InsertElementFromHistory(IHistoryElement element)
+    {
+        // shallow copy of element (so that element can be changed externally)
+        var copy = (IHistoryElement)element.Clone();
+
+        // let inheriting classes handle it
+        this.HandleInsertElementFromHistory(copy);
+    }
+    #endregion
 }

MultiTerm.Wpf.CustomControl/MultiFormatTextBox/MultiFormatTextBox.cs

@@ -137,10 +137,14 @@ public class MultiFormatTextBox : Control
                 incc.CollectionChanged += mftb.MultiFormatString_CollectionChanged;
             }
         }
-        else if(mftb.CurrentMultiFormatString == null)
+
+        // reset textbox and insert items if there are any
+        mftb.ResetTextBox();
+        if(mftb.CurrentMultiFormatString.Count > 0)
         {
-            mftb.ResetTextBox();
+            mftb.AddItemsToTextBox(mftb.CurrentMultiFormatString, 0);
         }
+
     }
 
     /// <summary>

MultiTerm.Wpf/MultiTerm.Wpf.csproj

@@ -9,6 +9,7 @@
 
   <ItemGroup>
     <None Remove="Assets\mdi-console-white.png" />
+    <None Remove="Assets\mdi-import.png" />
     <None Remove="Assets\mdi-keyboard.png" />
     <None Remove="Assets\mdi-network.png" />
     <None Remove="Assets\mdi-serial-port.png" />
@@ -29,6 +30,7 @@
 
   <ItemGroup>
     <Resource Include="Assets\mdi-console-white.png" />
+    <Resource Include="Assets\mdi-import.png" />
     <Resource Include="Assets\mdi-keyboard.png" />
     <Resource Include="Assets\mdi-network.png" />
     <Resource Include="Assets\mdi-serial-port.png" />

MultiTerm.Wpf/View/ShellView.xaml

@@ -97,11 +97,6 @@
         </StatusBar>
         <Separator DockPanel.Dock="Bottom" Margin="0 5 0 5"/>
 
-        <!-- Left Panel that holds History and Command Sets -->
-        <StackPanel Orientation="Vertical" DockPanel.Dock="Left" Width="150">
-            
-        </StackPanel>
-        
         <!-- Grid to contain hidden add Tab Button, and the tab control -->
         <Grid DockPanel.Dock="Right">
             <Grid.RowDefinitions>
@@ -109,8 +104,8 @@
                 <RowDefinition Height="*"/>
             </Grid.RowDefinitions>
             <Grid.ColumnDefinitions>
-                <ColumnDefinition Width="0"/>
-                <ColumnDefinition Width="*"/>
+                <ColumnDefinition Width="1*"/>
+                <ColumnDefinition Width="6*" MinWidth="1200"/>
             </Grid.ColumnDefinitions>
 
             <Grid.Resources>
@@ -141,6 +136,56 @@
                 </Button.ContextMenu>
             </Button>
 
+            <!-- Left Panel that holds History and Command Sets -->
+            <StackPanel Orientation="Vertical" Grid.Row="1" Grid.Column="0" Width="Auto">
+                <GroupBox Header="Send History">
+                    <!-- History -->
+                    <ListView x:Name="historyListView"
+                              ItemsSource="{Binding Path=SelectedTerminalViewModel.SentMessagesHistory}"
+                              ScrollViewer.HorizontalScrollBarVisibility="Disabled"
+                              ScrollViewer.VerticalScrollBarVisibility="Auto">
+                        <!-- Hide ListView if there are no items -->
+                        <ListView.Style>
+                            <Style TargetType="{x:Type ListView}">
+                                <Setter Property="Visibility" Value="Visible"/>
+                                <Style.Triggers>
+                                    <!-- Collapsed when no history available (0 items, fallback 1, to not hide it on error) -->
+                                    <DataTrigger Binding="{Binding Path=SelectedTerminalViewModel.SentMessagesHistory.Count, FallbackValue=1, TargetNullValue=1}" Value="0">
+                                        <Setter Property="Visibility" Value="Collapsed"/>
+                                    </DataTrigger>
+                                </Style.Triggers>
+                            </Style>
+                        </ListView.Style>
+                        <!-- Make items non-selectable and stretch -->
+                        <ListView.ItemContainerStyle>
+                            <Style TargetType="ListViewItem">
+                                <Setter Property="Focusable" Value="false"/>
+                                <Setter Property="HorizontalContentAlignment" Value="Stretch"/>
+                            </Style>
+                        </ListView.ItemContainerStyle>
+                        <!-- Template for item -->
+                        <ListView.ItemTemplate>
+                            <DataTemplate>
+                                <DockPanel LastChildFill="False" HorizontalAlignment="Stretch">
+                                    <TextBlock DockPanel.Dock="Left" Text="{Binding DisplayText}"
+                                               VerticalAlignment="Center"/>
+                                    <!-- Button Command binds with DataContext of historyListView, CommandParameter binds with the item -->
+                                    <Button DockPanel.Dock="Right" ToolTip="Insert" 
+                                            Command="{Binding Path=DataContext.SelectedTerminalViewModel.InsertElementFromHistoryCommand, ElementName=historyListView}"
+                                            CommandParameter="{Binding}">
+                                        <Image Source="/Assets/mdi-import.png" Width="20" Margin="0"/>
+                                    </Button>
+                                </DockPanel>
+                            </DataTemplate>
+                        </ListView.ItemTemplate>
+                    </ListView>
+                </GroupBox>
+            </StackPanel>
+
+            <!-- Splitter between two parts of UI -->
+            <GridSplitter Grid.Column="0" Grid.RowSpan="2" Width="2.5" Background="LightGray"/>
+
+            <!-- Tab control -->
             <custom_controls:ExtendedTabControl Grid.Row="1" Grid.Column="1"
                 x:Name="terminalTabControl"
                 IsSynchronizedWithCurrentItem="True"
@@ -164,7 +209,7 @@
                         <ContentControl Content="{Binding}"/>
                     </DataTemplate>
                 </behaviours:TabContent.Template>
-                
+
                 <!-- Tab Header Template -->
                 <custom_controls:ExtendedTabControl.ItemTemplate>
                     <DataTemplate>