Questions on UI for WPF Forum

1 answer

16 views

I use RadRichTextBox (WPF) to edit HTML documents.

These contain images with annotations.

It works as expected (except for the context menu popping up when I mark an image) and I can position the images according to my needs.

See Before.png where the red arrow points to something in the image.

When I save the HTML and load it into the RadRichTextBox again the image positioning is totally gone. See After.png

Am I missing something or does the HtmlDataProvider simply not work as expected?

RichTextBox

answered on 08 Aug 2025

0 answers

29 views

Simple Word Document Crashes WPF RadRichTextBox

I am using Telerik UI for WPF 2024 Q4\Binaries.NoXaml\WPF80\Telerik.Windows.Documents.Flow.FormatProviders.Doc.dll (version 2024.4.1106.60) on Windows 11 Pro (24H2). The program is developed using VS 2022.

It simply tries to load and display the attached DOCX file and the component crashes during layout with a null reference exception.

         using var instream = File.OpenRead(path);

         var openXmlRadDocProvider =
            new Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.DocxFormatProvider();

         var raddoc = openXmlRadDocProvider.Import(instream);
         RadRtb.Document = raddoc;

Word displays this perfectly. Trying to determine if this is a Telerik bug or a "me" problem.

Stenly replied and said he was unable to reproduce using 2025.2.707. I am able to reproduce the crash with that version. I have attached my project in case I'm doing something wrong in code.

Thanks.

-John Reilly.

RichTextBox

updated question on 16 Jul 2025

1 answer

40 views

How to Delete Multiple Rows in a Table

Hi,

If I select multiple rows in a table in a RichTextBox, the delete options become un-selectable. How can I change this to enable me to delete multiple selected rows from a table?

RichTextBox

answered on 09 May 2025

1 answer

46 views

Arabic Digits in RadRichTextEditor

Hey Telerik Team,

I'm working with the RadRichTextEditor in WPF and ran into a little issue. When I switch my keyboard to Arabic, I was expecting to see Arabic digits (٠١٢٣٤٥), but instead, it still shows the standard Western numbers.

Is there a way to enable Arabic digits when typing in Arabic? I’ve looked around but haven’t had much luck so far. If there's a setting or a workaround that could help, I’d really appreciate any pointers!

using System.Globalization;

Console.OutputEncoding = System.Text.Encoding.UTF8;

CultureInfo arabicCulture = new CultureInfo("ar-AE");
arabicCulture.NumberFormat.DigitSubstitution = DigitShapes.NativeNational;
arabicCulture.NumberFormat.NativeDigits = ["٠", "١", "٢", "٣", "٤", "٥", "٦", "٧", "٨", "٩"];
//arabicCulture.CultureTypes = CultureTypes.
Thread.CurrentThread.CurrentCulture = arabicCulture;
Thread.CurrentThread.CurrentUICulture = arabicCulture;


int number = 12345;
Console.WriteLine(number.ToString(CultureInfo.CurrentCulture));

RichTextBox

answered on 20 Mar 2025

1 answer

48 views

Styling RichTextBox

Hi,

In my project I am working on using RichTextBox to edit HTML text. In the project I use implicit styling and the Expression Dark theme. And for everything else in the project it works fine, but I am having issues with the RichTextBox.

I have added the reference to the dll, and in App.xaml I have added the styles. I was expecting the textbox to become darker, but I can also see a bunch of errors from the styling.

Wonder what I am missing.

RichTextBox

answered on 27 Feb 2025

0 answers

48 views

Error on delete text after type entire the inserted text in Track Change mode

Hello,

I have found a bug in the Track Changes Mode. It also occurs in the latest version (in the demo). To reproduce the bug:

Enable Track Changes mode.
Insert some text, e.g., "Lorem Ipsum is simply dummy text of the printing and typesetting industry."
Wait for a short period (to allow the insertion to occur at different times), approximately 10-15 seconds.
After inserting a word entire the existing text (like on the screenshot), type a character or word, then immediately try to delete the last character using the backspace key. At this point, the error occurs: backspace does not remove the last character, only on the second attempt.

The error occurs in Telerik WPF 2022.1.222, but in the new version, it still appears, though without throwing exceptions (I checked in the lastest demo, and the last character doesn't delete on the first attempt).

Can you reproduce this issue, or is it a known problem?

Is there a solution available?

RichTextBox

updated question on 21 Jan 2025

1 answer

160 views

CheckBoxControl not visible WPF .NET 8.0

I have a new WPF application, one that I am updating from Framework to Core. Everything has been converted and working properly except for one thing: the CheckBoxControl controls are not displaying. All other controls, including things like RadButton are RadGridView, are all displaying and working perfectly. I deleted the BIN and OBJ folders and cleaned the project, no change.

If I change the code to use the standard WPF CheckBox control everything works correctly.

The main project of the solution has this inside it's project file:

I have other projects in the solution that have working Telerik controls (except for the CheckBoxControl) that contain this in their project files:

in the xaml form:

<telerik:CheckBoxControl Grid.Row="5" Grid.Column="0" Name="ChkCustomProcess" HorizontalAlignment="Right" VerticalAlignment="Center" Margin="5" />

// I have tried this with and without binding to the IsChecked property.

Everything else works fine, including the theming, except for the invisible CheckBox Control. IntelliSense works in the editor; no compilation errors or warnings.

I am using the NuGet packages from Telerik. There are no pending updates. I am not referencing any NoXaml packages.

It's probably something simple I am missing. Any thoughts and ideas would be greatly appreciated.

Thanks,
Lou

General Discussions

RichTextBox

answered on 13 Jan 2025

0 answers

52 views

Drag and DropText outside of RichTextBox

I would like to drag text outside of a WPF RadRichTextBox into a different App.

It seems that dragging any text just outside of this control is not possible, not even within the same app.
IMHO the problem is, that text can be moved within this control, and this feature cannot be deactivated.

Thanks a lot in advance for any hints.

Edit: Just checked with standard RichTextBox (FlowControl) no problems out of the box. I can drag text internal and as soon as mousepointer went outside, everything is fine and works there. Try this with RadRichTextBox and the Prompt goes crazy inside of your control.

DragAndDrop

RichTextBox

updated question on 06 Dec 2024

2 answers

52 views

Integrating RadSyntaxEditor and RadSpellChecker

Hi every one,

I've read the documentation about RadSpellChecker and couldn't find anything to do with RadSyntaxEditor. I've already implemented a spellchecker inspiring WordSpellChecker class from SDK Sample Browser and linked it to the RadSyntaxControl via a tagger although I'm not sure if it's a best practice. This solution has a couple of issues including having a lag as a result of working with document in WordSpellChecker and also it needs to be implemented everything from scratch like managing the dictionary.

Does anyone have any better idea or is there any smooth way to join them?

Thanks,
Dariush

answered on 04 Nov 2024

1 answer

59 views

RadDocument CaretPosition Exception: inline does not belong to this document

Hi,

We are getting an exception when trying to set the CaretPosition in a RadDocument.

The Document is created in code:

        public void PurchaseTemplate()
        {
            try
            {
                RadDocumentEditor editor = new RadDocumentEditor(doc_text.Document);
                string[] rowName = new string[] { "Make", "Model", "Technical Spec.", "Order No.", "Date Ordered", "Date Delivered", "Price", "Payment Method", "Supplier", "Tel.", "Other Details", "Manufacturer", "Tel.", "Other Details", "Guarantee", "Period", "Expiry Date", "Notes" };

                TableWidthUnit w1 = new TableWidthUnit(180);    // Date
                TableWidthUnit w2 = new TableWidthUnit(500);    // Day

                TableCell cell1 = new TableCell();
                TableCell cell2 = new TableCell();

                TableRow row = new TableRow();
                Paragraph p1 = new Paragraph();
                Span s1 = new Span();
                string subject = " ";
                if (_selelement != null)
                {
                    subject = _selelement.GetAttribute("title");
                }


                Table table = new Table();
                table.StyleName = RadDocumentDefaultStyles.DefaultTableGridStyleName;
                table.Tag = "5000";
                table.Rows.ElementAdded += doc_text_DiaryChanged;

                cell1.Background = Color.FromRgb(242, 219, 219);
                cell1.PreferredWidth = w1;
                cell1.Padding = new Telerik.Windows.Documents.Layout.Padding(3, 6, 3, 6);
                s1.FontWeight = FontWeights.Bold;
                s1.FontFamily = new FontFamily(CGlobals.docu_default_font);
                s1.FontSize = Unit.PointToDip(CGlobals.docu_default_font_size);
                s1.Text = "Item";
                p1.Inlines.Add(s1);
                cell1.Blocks.Add(p1);

                p1 = new Paragraph();
                s1 = new Span();
                cell2.Background = Color.FromRgb(242, 219, 219);
                cell2.PreferredWidth = w2;
                cell2.Padding = new Telerik.Windows.Documents.Layout.Padding(3, 6, 3, 6);
                s1.FontWeight = FontWeights.Bold;
                s1.FontFamily = new FontFamily(CGlobals.docu_default_font);
                s1.FontSize = Unit.PointToDip(CGlobals.docu_default_font_size);
                s1.Text = subject;
                p1.Inlines.Add(s1);
                cell2.Blocks.Add(p1);

                row.Cells.Add(cell1);
                row.Cells.Add(cell2);
                table.Rows.Add(row);
                int nRow = 0;
                foreach (string name in rowName)
                {
                    row = new TableRow();
                    cell1 = new TableCell();
                    cell2 = new TableCell();
                    switch (nRow)
                    {
                        default:
                            p1 = new Paragraph();
                            s1 = new Span();
                            cell1.Background = Color.FromRgb(255, 255, 255);
                            cell1.PreferredWidth = w1;
                            cell1.Padding = new Telerik.Windows.Documents.Layout.Padding(3, 6, 3, 6);
                            s1.FontWeight = FontWeights.Bold;
                            s1.FontFamily = new FontFamily(CGlobals.docu_default_font);
                            s1.FontSize = Unit.PointToDip(CGlobals.docu_default_font_size);
                            s1.Text = name;
                            p1.Inlines.Add(s1);
                            cell1.Blocks.Add(p1);

                            p1 = new Paragraph();
                            s1 = new Span();
                            cell2.Background = Color.FromRgb(255, 255, 255);
                            cell2.PreferredWidth = w2;
                            cell2.Padding = new Telerik.Windows.Documents.Layout.Padding(3, 6, 3, 6);
                            s1.FontFamily = new FontFamily(CGlobals.docu_default_font);
                            s1.FontSize = Unit.PointToDip(CGlobals.docu_default_font_size);
                            s1.Text = " ";
                            p1.Inlines.Add(s1);
                            cell2.Blocks.Add(p1);

                            row.Cells.Add(cell1);
                            row.Cells.Add(cell2);
                            table.Rows.Add(row);
                            break;
                        case 9:
                        case 10:
                        case 12:
                        case 13:
                        case 15:
                        case 16:
                            DocumentList bullets = new DocumentList(DefaultListStyles.Bulleted, doc_text.Document);
                            p1 = new Paragraph();
                            s1 = new Span();
                            cell1.Background = Color.FromRgb(255, 255, 255);
                            cell1.PreferredWidth = w1;
                            cell1.Padding = new Telerik.Windows.Documents.Layout.Padding(3, 6, 3, 6);
                            s1.FontFamily = new FontFamily(CGlobals.docu_default_font);
                            s1.FontSize = Unit.PointToDip(CGlobals.docu_default_font_size);
                            s1.Text = name;
                            p1.Inlines.Add(s1);
                            bullets.AddParagraph(p1);
                            cell1.Blocks.Add(p1);

                            p1 = new Paragraph();
                            s1 = new Span();
                            cell2.Background = Color.FromRgb(255, 255, 255);
                            cell2.PreferredWidth = w2;
                            cell2.Padding = new Telerik.Windows.Documents.Layout.Padding(3, 6, 3, 6);
                            s1.FontFamily = new FontFamily(CGlobals.docu_default_font);
                            s1.FontSize = Unit.PointToDip(CGlobals.docu_default_font_size);
                            s1.Text = " ";
                            p1.Inlines.Add(s1);
                            cell2.Blocks.Add(p1);

                            row.Cells.Add(cell1);
                            row.Cells.Add(cell2);
                            table.Rows.Add(row);
                            break;
                        case 17:
                            p1 = new Paragraph();
                            s1 = new Span();
                            cell1.Background = Color.FromRgb(255, 255, 255);
                            cell1.PreferredWidth = w1;
                            cell1.Padding = new Telerik.Windows.Documents.Layout.Padding(3, 6, 3, 6);
                            cell1.RowSpan = 7;
                            s1.FontWeight = FontWeights.Bold;
                            s1.FontFamily = new FontFamily(CGlobals.docu_default_font);
                            s1.FontSize = Unit.PointToDip(CGlobals.docu_default_font_size);
                            s1.Text = name;
                            p1.Inlines.Add(s1);
                            cell1.Blocks.Add(p1);

                            p1 = new Paragraph();
                            s1 = new Span();
                            cell2.Background = Color.FromRgb(255, 255, 255);
                            cell2.PreferredWidth = w2;
                            cell2.Padding = new Telerik.Windows.Documents.Layout.Padding(3, 6, 3, 6);
                            s1.FontFamily = new FontFamily(CGlobals.docu_default_font);
                            s1.FontSize = Unit.PointToDip(CGlobals.docu_default_font_size);
                            s1.Text = " ";
                            p1.Inlines.Add(s1);
                            cell2.Blocks.Add(p1);

                            row.Cells.Add(cell1);
                            row.Cells.Add(cell2);
                            table.Rows.Add(row);
                            for (int x = 0; x < 6; x++)
                            {
                                row = new TableRow();
                                cell2 = new TableCell();
                                p1 = new Paragraph();
                                s1 = new Span();
                                cell2.Background = Color.FromRgb(255, 255, 255);
                                cell2.PreferredWidth = w2;
                                cell2.Padding = new Telerik.Windows.Documents.Layout.Padding(3, 6, 3, 6);
                                s1.FontFamily = new FontFamily(CGlobals.docu_default_font);
                                s1.FontSize = Unit.PointToDip(CGlobals.docu_default_font_size);
                                s1.Text = " ";
                                p1.Inlines.Add(s1);
                                cell2.Blocks.Add(p1);
                                row.Cells.Add(cell2);
                                table.Rows.Add(row);
                            }
                            break;
                    }
                    nRow++;

                }
                editor.InsertTable(table);

                // Insert a field so we can identify the type of template
                //var cell = table.EnumerateChildrenOfType<TableCell>().FirstOrDefault();
                var cell = table.EnumerateChildrenOfType<TableCell>().FirstOrDefault();
                if (cell != null)
                {
                    DocumentPosition position = new DocumentPosition(doc_text.Document);
                    position.MoveToDocumentElementStart(cell.Blocks.First());
                    DocumentVariableField docVariable = new DocumentVariableField() { VariableName = "5000" };
                    editor.InsertField(docVariable);
                }
                doc_text.Document.DocumentVariables["5000"] = "";
                var field = doc_text.Document.EnumerateChildrenOfType<FieldRangeStart>().Where(x => x.Field.FieldTypeName == "DOCVARIABLE"
                && ((DocumentVariableField)x.Field).VariableName == "5000").FirstOrDefault();
                if (field != null)
                {
                    doc_text.UpdateField(field);
                }
                // Add the Datepickers
                var hrow5 = table.EnumerateChildrenOfType<TableRow>().ToList()[5];
                var hrow6 = table.EnumerateChildrenOfType<TableRow>().ToList()[6];
                var hrow17 = table.EnumerateChildrenOfType<TableRow>().ToList()[17];
                AddPurchaseDatePicker(table, hrow5);
                AddPurchaseDatePicker(table, hrow6);
                AddPurchaseDatePicker(table, hrow17);
            }
            catch (Exception e)
            {
                CGlobals cg = new CGlobals();
                cg.ShowError("TemplateHandler:PurchaseTemplate Error\n" + e.Message, 3);

            }
        }

We are then trying to insert a DateProperties into 3 cells in the table created using AddPurchaseDatePicker(Table, TableRow) :

        public void AddPurchaseDatePicker(Table table, TableRow row)
        {
            try
            {
                RadDocument document = doc_text.Document;
                RadDocumentEditor editor = new RadDocumentEditor(document);
                var dateCell = row.Cells.ToList()[1];
                DocumentPosition position = new DocumentPosition(document);
                string dateVal = string.Empty;

                var span = dateCell.EnumerateChildrenOfType<Span>().FirstOrDefault();
                if (span != null)
                {
                    dateVal = span.Text;
                    span.Text = " ";
                }
                position.MoveToDocumentElementStart(dateCell.Blocks.First());
                document.CaretPosition.MoveToPosition(position);
                editor.ChangeFontFamily(new FontFamily(CGlobals.docu_default_font));
                editor.ChangeFontSize(Unit.PointToDip(CGlobals.docu_default_font_size));
                DateProperties dataProperties = new DateProperties();
                try
                {
                    dataProperties.FullDate = DateTime.Parse(dateVal);
                }
                catch { }
               
                dataProperties.IsTemporary = false;
                dataProperties.StyleName = "TemplateFields";
                editor.InsertStructuredDocumentTag(dataProperties);
                doc_text.Document = document;
                table.Rows.ElementAdded += doc_text_NoteChanged;
            }
            catch { }
        }

When we try and set the CaretPosition with

document.CaretPosition.MoveToPosition(position);

we recieve the following exception:

System.InvalidOperationException
HResult=0x80131509
Message=inline does not belong to this document.
Source=Telerik.Windows.Controls.RichTextBox
StackTrace:
at Telerik.Windows.Documents.Model.RadDocument.GetContainingAnnotationRanges[TRangeStart](Inline inline, Predicate`1 filter, Boolean inclusive)
at Telerik.Windows.Documents.Model.RadDocument.GetContainingAnnotationRanges[TRangeStart](Inline inline, Boolean inclusive)
at Telerik.Windows.Documents.DocumentPosition.get_IsPositionInSkipPositionRange()
at Telerik.Windows.Documents.DocumentPosition.get_IsValidPosition()
at Telerik.Windows.Documents.DocumentPosition.Validator.EnsureValidPosition(DocumentPosition position, Func`1 shouldSearchForward)
at Telerik.Windows.Documents.DocumentPosition.OnPositionChanged()
at Telerik.Windows.Documents.Utils.SuspendChangingAndChangedActionCounter.InvokeChangedActionInternal()
at Telerik.Windows.Documents.Utils.SuspendChangingAndChangedActionCounter.InvokeChanged()
at Telerik.Windows.Documents.DocumentPosition.MoveToPosition(DocumentPosition newPosition)
at DocuPraxis.MainWindow.AddPurchaseDatePicker(Table table, TableRow row) in E:\Source\Repos\Panarc\DocuPraxisTel\DocuPraxis\DocuPraxisTemplateHandler.cs:line 1634

We are using a similar method to add DateProperties in other generated documents without problem, e.g.:

        public void AddNotesDatePicker(Table table, TableRow row)
        {
            try
            {
                RadDocument document = doc_text.Document;
                RadDocumentEditor editor = new RadDocumentEditor(document);
                var dateCell = row.Cells.ToList()[0];
                DocumentPosition position = new DocumentPosition(document);
                string dateVal = string.Empty;
                
                var span = dateCell.EnumerateChildrenOfType<Span>().FirstOrDefault();
                if (span != null)
                {
                    dateVal = span.Text;
                    if(String.IsNullOrEmpty(dateVal) || dateVal == " " )
                    {
                        dateVal = DateTime.Now.ToString("dd/MM/yyyy");
                    }
                    span.Text = " ";
                }
                position.MoveToDocumentElementStart(dateCell.Blocks.First());
                document.CaretPosition.MoveToPosition(position);
                editor.ChangeFontFamily(new FontFamily(CGlobals.docu_default_font));
                editor.ChangeFontSize(Unit.PointToDip(CGlobals.docu_default_font_size));
                DateProperties dataProperties = new DateProperties();
                dataProperties.FullDate = DateTime.Parse(dateVal);
                dataProperties.IsTemporary = false;
                dataProperties.StyleName = "TemplateFields";
                editor.InsertStructuredDocumentTag(dataProperties);
                doc_text.Document = document;
                table.Rows.ElementAdded += doc_text_NoteChanged;
            }
            catch { }
        }

What are we doing wrong?

RichTextBox

answered on 07 Oct 2024