MultiFormatTextBox:

fixed deleting from other format,
implemented getting background brush from resources

MultiTerm.Wpf.CustomControl/MultiFormatTextBox/MultiFormatTextBox.cs

@@ -42,6 +42,8 @@ namespace MultiTerm.Wpf.CustomControl;
 /// </summary>
 internal class Format
 {
+    private readonly string? backgroundColorResourceName;
+
     public string Name { get; set; }
     public Brush BackgroundBrush { get; set; }
     public Predicate<Key> IsKeyValid { get; set; }
@@ -51,18 +53,34 @@ internal class Format
         this.BackgroundBrush = backgroundBrush;
         this.IsKeyValid = keyValidator;
     }
-    public Format(string name, string backgroundBrushColorHexCode, Predicate<Key> keyValidator)
+    public Format(string name, string backgroundColorResourceName, Predicate<Key> keyValidator)
     {
         this.Name = name;
-        var brushObj = new BrushConverter().ConvertFrom(backgroundBrushColorHexCode);
-        if(brushObj == null) throw new ArgumentException(nameof(backgroundBrushColorHexCode));
-        this.BackgroundBrush = (SolidColorBrush)brushObj;
+        this.backgroundColorResourceName = backgroundColorResourceName;
+        this.BackgroundBrush = Brushes.White;  // set background brush to white
         this.IsKeyValid = keyValidator;
     }
     public static List<string> GetListOfNames(IEnumerable<Format> formats)
     {
         return formats.Select(item => item.Name).ToList();
     }
+    public static void UpdateBackgroundBrushesFromResources(FrameworkElement fwElement, IEnumerable<Format> formats)
+    {
+        if (fwElement == null) throw new ArgumentNullException(nameof(fwElement));
+
+        foreach (var format in formats)
+        {
+            // if resource name not set => skip
+            if (format.backgroundColorResourceName == null) continue;
+
+            // get background brush color from resources
+            try
+            {
+                format.BackgroundBrush = (SolidColorBrush)fwElement.FindResource(format.backgroundColorResourceName);
+            }
+            catch (Exception) { continue; } // ignore 
+        }
+    }
 }
 
 public class MultiFormatTextBox : Control
@@ -71,19 +89,19 @@ public class MultiFormatTextBox : Control
     private static readonly List<Format> formats = new()
     {
         // character input, accepts all keys except space
-        new Format("CHAR", Brushes.LightSkyBlue, delegate(Key k) { return (k != Key.Space); }),
-        //new Format("CHAR", "B4EBEB", delegate(Key k) { return (k != Key.Space); }),
+        //new Format("CHAR", Brushes.LightSkyBlue, delegate(Key k) { return (k != Key.Space); }),
+        new Format("CHAR", "MultiFormatTextBox.CHAR.Background", delegate(Key k) { return (k != Key.Space); }),
         // hex input, ignores all keys that are not inbetween 0 and F
-        new Format("HEX", Brushes.LightGreen, delegate(Key k) { return (k >= Key.D0 && k <= Key.F); }),
-        //new Format("HEX", "C8C8FF", delegate(Key k) { return (k >= Key.D0 && k <= Key.F); }),
+        //new Format("HEX", Brushes.LightGreen, delegate(Key k) { return (k >= Key.D0 && k <= Key.F); }),
+        new Format("HEX", "MultiFormatTextBox.HEX.Background", delegate(Key k) { return (k >= Key.D0 && k <= Key.F); }),
         // binary input, ignores all keys except 0 and 1
-        new Format("BIN", Brushes.LightPink, delegate(Key k) { return (k == Key.D0 || k == Key.D1); })
-        //new Format("BIN", "C8FFC8", delegate(Key k) { return (k == Key.D0 || k == Key.D1); })
+        //new Format("BIN", Brushes.LightPink, delegate(Key k) { return (k == Key.D0 || k == Key.D1); })
+        new Format("BIN", "MultiFormatTextBox.BIN.Background", delegate(Key k) { return (k == Key.D0 || k == Key.D1); })
     };
 
     private ComboBox comboBox;
     private RichTextBox richTextBox;
-    private Format currentlySelectedFormat = formats.First();
+    private Format currentlySelectedFormat;
     private int offsetContentStartToFormatStart;
 
     static MultiFormatTextBox()
@@ -95,6 +113,12 @@ public class MultiFormatTextBox : Control
     {
         base.OnApplyTemplate();
 
+        // initialize format background brushes
+        Format.UpdateBackgroundBrushesFromResources(this, formats);
+        // set initially selected format
+        this.currentlySelectedFormat = formats!.First();
+        
+
         // get comboBox from template
         var comboBox = GetTemplateChild("comboBox") as ComboBox;
         if (comboBox != null)
@@ -134,7 +158,7 @@ public class MultiFormatTextBox : Control
         this.InsertSeparation();
 
         // set new start position
-        this.offsetContentStartToFormatStart = this.richTextBox.CaretPosition.GetOffsetToPosition(this.richTextBox.Document.ContentStart);
+        this.StoreCaretPosition();
 
         // focus textbox
         this.richTextBox.Focus();
@@ -146,7 +170,7 @@ public class MultiFormatTextBox : Control
         this.richTextBox.TextChanged -= RichTextBox_TextChanged;
 
         // store caret position before
-        this.offsetContentStartToFormatStart = this.richTextBox.CaretPosition.GetOffsetToPosition(this.richTextBox.Document.ContentStart);
+        this.StoreCaretPosition();
 
         // insert
         this.richTextBox.AppendText(" ");
@@ -158,12 +182,17 @@ public class MultiFormatTextBox : Control
            color: defaultBackgroundBrush);
 
         // store new caret position after
-        this.offsetContentStartToFormatStart = this.richTextBox.CaretPosition.GetOffsetToPosition(this.richTextBox.Document.ContentStart);
+        this.StoreCaretPosition();
 
         // reenable
         this.richTextBox.TextChanged += RichTextBox_TextChanged;
     }
 
+    private void StoreCaretPosition()
+    {
+        this.offsetContentStartToFormatStart = this.richTextBox.CaretPosition.GetOffsetToPosition(this.richTextBox.Document.ContentStart);
+    }
+
     private void RichTextBox_KeyDown(object sender, KeyEventArgs e)
     {
         // guard combobox null
@@ -178,12 +207,21 @@ public class MultiFormatTextBox : Control
 
     private void RichTextBox_TextChanged(object sender, TextChangedEventArgs e)
     {
-        if(e.Changes.Count > 1) { return; }
+        if (e.Changes.Count > 1 || e.Changes.Count == 0) { return; }
 
-        RtbChangeTextBackground(this.richTextBox,
-            start: this.richTextBox.Document.ContentStart.GetPositionAtOffset(-this.offsetContentStartToFormatStart),
-            end: this.richTextBox.Document.ContentEnd,
-            color: this.currentlySelectedFormat.BackgroundBrush);
+        // if something was added => change background color
+        if (e.Changes.First().AddedLength > 0)
+        { 
+            RtbChangeTextBackground(this.richTextBox,
+                start: this.richTextBox.Document.ContentStart.GetPositionAtOffset(-this.offsetContentStartToFormatStart),
+                end: this.richTextBox.Document.ContentEnd,
+                color: this.currentlySelectedFormat.BackgroundBrush);
+        }
+        // if something was removed => update start of content to current location
+        else if(e.Changes.First().RemovedLength > 0)
+        {
+            this.StoreCaretPosition();
+        }
     }
 
     private static void RtbChangeTextBackground(RichTextBox rtb, TextPointer start, TextPointer end, Brush color)

MultiTerm.Wpf.CustomControl/MultiFormatTextBox/MultiFormatTextBox.xaml

@@ -2,9 +2,6 @@
                     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.MouseOver.Border" Color="#FF7EB4EA"/>
-    <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="BorderBrush" Value="{StaticResource TextBox.Static.Border}"/>
@@ -16,6 +13,11 @@
         <Setter Property="AllowDrop" Value="true"/>
         <Setter Property="ScrollViewer.PanningMode" Value="VerticalFirst"/>
         <Setter Property="Stylus.IsFlicksEnabled" Value="False"/>-->
+        <Style.Resources>
+            <SolidColorBrush x:Key="MultiFormatTextBox.CHAR.Background" Color="#B4EBEB"/>
+            <SolidColorBrush x:Key="MultiFormatTextBox.HEX.Background" Color="#C8C8FF"/>
+            <SolidColorBrush x:Key="MultiFormatTextBox.BIN.Background" Color="#C8FFC8"/>
+        </Style.Resources>
         <Setter Property="Template">
             <Setter.Value>
                 <ControlTemplate TargetType="{x:Type local:MultiFormatTextBox}">