implemented automatic reload of COM ports in SerialSettingsView and automatic reload of usb devices in UsbHidSettingsView.

therefore implemented ICloneable and IEquatable in UsbHidDeviceInfo

MultiTerm.Protocols/UsbHid/UsbHidDeviceInfo.cs

@@ -1,6 +1,6 @@
 namespace MultiTerm.Protocols.UsbHid;
 
-public class UsbHidDeviceInfo
+public class UsbHidDeviceInfo : ICloneable, IEquatable<UsbHidDeviceInfo>
 {
     public string VendorId { get; internal set; } = string.Empty;
 
@@ -9,4 +9,30 @@ public class UsbHidDeviceInfo
     public string Manufacturer { get; internal set; } = string.Empty;
 
     public string SerialNumber { get; internal set; } = string.Empty;
+
+    #region ICloneable Implementation
+    public object Clone()
+    {
+        return base.MemberwiseClone();
+    }
+    #endregion
+
+    #region IEquatable<UsbHidDeviceInfo> Implementation
+    public bool Equals(UsbHidDeviceInfo? other)
+    {
+        // null cases
+        if (other == null && this == null)
+        { return true; }
+        if (other == null && this != null)
+        { return false; }
+
+        // otherwise if vendor id, product id and serial number match => they are equal
+        if (this.VendorId == other!.VendorId &&
+            this.ProductId == other!.ProductId &&
+            this.SerialNumber == other!.SerialNumber)
+        { return true; }
+        else
+        { return false; }
+    }
+    #endregion
 }

MultiTerm.Protocols/UsbHid/UsbHidProtocolSettingsViewModel.cs

@@ -33,9 +33,30 @@ public partial class UsbHidProtocolSettingsViewModel : ProtocolSettingsViewModel
     [RelayCommand]
     private void ReloadDevices()
     {
+        UsbHidDeviceInfo? previouslySelectedDevice = null;
+
+        // if any device is selected => temporarily store it
+        if (this.SelectedDevice != null)
+        {
+            // shallow copy of the device
+            previouslySelectedDevice = (UsbHidDeviceInfo)this.SelectedDevice.Clone();       
+        }
+
+        // reload collection
         this.Devices = new ObservableCollection<UsbHidDeviceInfo>(UsbHidProtocol.GetDevices());
 
-        // select first deivce, if none is selected yet and there are some available
+        // select previously selected device again if it still exists
+        if (previouslySelectedDevice != null)
+        {
+            var equalDevices = this.Devices.Where(d => d.Equals(previouslySelectedDevice));
+            // exactly one match found => take as selected device and quit method
+            if(equalDevices.Count() == 1)
+            {
+                this.SelectedDevice = equalDevices.First();
+            }
+        }
+
+        // otherwise select first device, if none is selected yet and there are some available
         if (this.SelectedDevice == null && this.Devices.Any())
         {
             this.SelectedDevice = this.Devices.First();

MultiTerm.Wpf/View/SettingsView/SerialSettingsView.xaml

@@ -7,6 +7,7 @@
              xmlns:local="clr-namespace:MultiTerm.Wpf.View.SettingsView"
              xmlns:conv="clr-namespace:MultiTerm.Wpf.ValueConverters"
              xmlns:serial_protocol="clr-namespace:MultiTerm.Protocols.Serial;assembly=MultiTerm.Protocols"
+             xmlns:XamlBehavioursWpf="http://schemas.microsoft.com/xaml/behaviors"
              mc:Ignorable="d" 
              d:DesignHeight="50" d:DesignWidth="800">
     <DockPanel>
@@ -43,16 +44,39 @@
             </StackPanel.Resources>
             
             <Label Margin="10 0" VerticalAlignment="Center">Port: </Label>
-            <ComboBox Width="100" ItemsSource="{Binding Path=ComPorts}" SelectedItem="{Binding Path=PortName, Mode=TwoWay}"
+            <ComboBox Width="100" x:Name="comboBoxPorts"
-                      VerticalContentAlignment="Center"/>
+                      ItemsSource="{Binding Path=ComPorts}" SelectedItem="{Binding Path=PortName, Mode=TwoWay}"
+                      VerticalContentAlignment="Center">
+                <!-- Auto reload com ports when opening combobox -->
+                <XamlBehavioursWpf:Interaction.Triggers>
+                    <XamlBehavioursWpf:EventTrigger EventName="DropDownOpened" SourceObject="{Binding ElementName=comboBoxPorts}">
+                        <XamlBehavioursWpf:InvokeCommandAction Command="{Binding ReloadComPortsCommand}" />
+                    </XamlBehavioursWpf:EventTrigger>
+                </XamlBehavioursWpf:Interaction.Triggers>
+            </ComboBox>
             <Button Margin="5 0" Content="R" VerticalContentAlignment="Center"
                     Command="{Binding ReloadComPortsCommand}" Width="25"/>
 
             <Label Margin="20 0 10 0" VerticalAlignment="Center">Baud Rate:</Label>
-            <TextBox Width="100" VerticalContentAlignment="Center" Text="{Binding Path=BaudRate, Converter={StaticResource IntToStringConverter}, Mode=TwoWay}" />
+            <ComboBox IsEditable="True" Width="100" VerticalContentAlignment="Center" Text="{Binding Path=BaudRate, Converter={StaticResource IntToStringConverter}, Mode=TwoWay}" >
+                <ComboBoxItem Content="2400"/>
+                <ComboBoxItem Content="9600"/>
+                <ComboBoxItem Content="19200"/>
+                <ComboBoxItem Content="56000"/>
+                <ComboBoxItem Content="57600"/>
+                <ComboBoxItem Content="115200"/>
+                <ComboBoxItem Content="128000"/>
+                <ComboBoxItem Content="256000"/>
+            </ComboBox>
 
             <Label Margin="10 0 10 0" VerticalAlignment="Center">Data Bits:</Label>
-            <TextBox Width="40"  VerticalContentAlignment="Center" Text="{Binding Path=DataBits, Converter={StaticResource IntToStringConverter}, Mode=TwoWay}" />
+            <ComboBox IsEditable="False" Width="Auto" VerticalContentAlignment="Center" Text="{Binding Path=DataBits, Converter={StaticResource IntToStringConverter}, Mode=TwoWay}" >
+                <ComboBoxItem Content="5"/>
+                <ComboBoxItem Content="6"/>
+                <ComboBoxItem Content="7"/>
+                <ComboBoxItem Content="8"/>
+                <ComboBoxItem Content="16"/>
+            </ComboBox>
             
             <Label Margin="10 0 10 0" VerticalAlignment="Center">Parity:</Label>
             <ComboBox Width="Auto" VerticalContentAlignment="Center"

MultiTerm.Wpf/View/SettingsView/UsbHidSettingsView.xaml

@@ -4,6 +4,7 @@
              xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
              xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
              xmlns:local="clr-namespace:MultiTerm.Wpf.View.SettingsView"
+             xmlns:XamlBehavioursWpf="http://schemas.microsoft.com/xaml/behaviors"
              mc:Ignorable="d" 
              d:DesignHeight="50" d:DesignWidth="800">
     <DockPanel>
@@ -80,9 +81,16 @@
             </StackPanel.Resources>
 
             <Label Margin="10 0" VerticalAlignment="Center">Devices:</Label>
-            <ComboBox Width="190" ItemsSource="{Binding Path=Devices}" SelectedItem="{Binding Path=SelectedDevice, Mode=TwoWay}"
+            <ComboBox Width="190" x:Name="comboBoxHidDevices"
+                      ItemsSource="{Binding Path=Devices}" SelectedItem="{Binding Path=SelectedDevice, Mode=TwoWay}"
                       VerticalContentAlignment="Center"
                       ItemTemplate="{StaticResource HidDeviceComboBoxTemplate}">
+                <!-- Auto reload hid devices when opening combobox -->
+                <XamlBehavioursWpf:Interaction.Triggers>
+                    <XamlBehavioursWpf:EventTrigger EventName="DropDownOpened" SourceObject="{Binding ElementName=comboBoxHidDevices}">
+                        <XamlBehavioursWpf:InvokeCommandAction Command="{Binding ReloadDevicesCommand}" />
+                    </XamlBehavioursWpf:EventTrigger>
+                </XamlBehavioursWpf:Interaction.Triggers>
             </ComboBox>
             <Button Margin="5 0" Content="R" VerticalContentAlignment="Center"
                     Command="{Binding ReloadDevicesCommand}" Width="25"/>