Richtextbox List Positioning

Question

I have a richtextbox, and inside I have a list. I would like the list to be located just below the carriage and move as the carriage moves.

How can i do this?

Should I manipulate the first two values ​​of listBox.Margin and how? Thanks!

Answer 1

Here is what I would do (replace your Rectangle with your ListBox):

 <Window x:Class="Wpf_Playground.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="MainWindow" Height="350" Width="525"> <Grid> <RichTextBox Margin="0,0,0,32" x:Name="rtb" SpellCheck.IsEnabled="True" SelectionChanged="RtbSelectionChanged" TextChanged="RtbTextChanged"> </RichTextBox> <Rectangle x:Name="rect" Width="30" Height="30" Fill="#80000000" VerticalAlignment="Top" HorizontalAlignment="Left" IsHitTestVisible="False"/> <TextBlock x:Name="tb" Margin="0" VerticalAlignment="Bottom" /> </Grid> </Window> using System.Windows; using System.Windows.Controls; using System.Windows.Documents; namespace Wpf_Playground { /// <summary> /// Interaction logic for MainWindow.xaml /// </summary> public partial class MainWindow { /// <summary> /// Initializes a new instance of the <see cref="MainWindow"/> class. /// </summary> public MainWindow() { InitializeComponent(); } private void RtbSelectionChanged(object sender, RoutedEventArgs e) { this.UpdateCaretInfo(); } /// <summary> /// The update caret info. /// </summary> private void UpdateCaretInfo() { var caretRect = rtb.CaretPosition.GetCharacterRect(LogicalDirection.Forward); tb.Text = caretRect.ToString(); rect.Margin = new Thickness( caretRect.Right, caretRect.Bottom, -caretRect.Right, -caretRect.Bottom); } private void RtbTextChanged(object sender, TextChangedEventArgs e) { this.UpdateCaretInfo(); } } } 

Answer 2

I'm not sure how to get the caret position (although this is a big question, and I would like to know how), but I know that a RichTextBox cannot contain child elements.

I assume that the solution will go along the lines of placing the RichTextBox and ListBox in the Canvas and positioning the ListBox at the Caret location every time the RichTextBox text changes.

But then again, I don't know how to get the caret position.: /