Line breaks as I type

[John]

In an application I work on, a developer has recently added replaced a couple regular Microsoft multiline textboxes with Telerik RichTextBoxes.  In one instance, it works fine.  In another instance the line breaks after several characters so it appears on the UI as typing like:

 This is an
example of what is happening when typing |

 

What may be causing this unintended line break?  This is the code implemented in this instance:

        private const string XamlMultilineTextBox =
            "<telerik:RadRichTextBox xmlns=\"{0}\" xmlns:telerik=\"{1}\" xmlns:x=\'{3}\' xmlns:rtf=\"clr-namespace:Telerik.Windows.Documents.FormatProviders.Txt;assembly=Telerik.Windows.Documents\" x:Name=\"RTFBox\"   Height=\"48\" VerticalScrollBarVisibility=\"Auto\" Margin=\"0\" VerticalContentAlignment=\"Stretch\"  FontFamily=\"Segoe UI\" FontSize=\"12\" FontStyle=\"Normal\" IsSpellCheckingEnabled=\"False\" FontWeight=\"Normal\" DocumentInheritsDefaultStyleSettings=\"True\"><telerik:RadRichTextBox.Resources><rtf:TxtDataProvider x:Key=\"RtfDataProvider\" RichTextBox=\"{{Binding ElementName=RTFBox}}\" Text=\"{{Binding {2}, Mode=TwoWay}}\"  /></telerik:RadRichTextBox.Resources></telerik:RadRichTextBox>";

        private static UIElement BuildMultiLineTextBox(MultilineTextBoxDescriptor descriptor)
        {
            var propertyName = descriptor.PropertyName;
            var output = string.Format(XamlMultilineTextBox, DefaultNamespace, TelerikNamespace, propertyName, winfxNamespace);
            
            // ReSharper disable JoinDeclarationAndInitializer
            UIElement ctrl;
            // ReSharper restore JoinDeclarationAndInitializer

#if SILVERLIGHT
            ctrl = (UIElement)XamlReader.Load(output);
#else
            ctrl = (UIElement)XamlReader.Parse(output);
#endif

            var multilineTextBox = (RadRichTextBox)ctrl;
            multilineTextBox.IsSelectionMiniToolBarEnabled = false;
            multilineTextBox.LayoutMode=DocumentLayoutMode.Flow;
            multilineTextBox.TabIndex = descriptor.TabIndex;
            multilineTextBox.ShowFormattingSymbols = false;
            multilineTextBox.IsContextMenuEnabled = false;


            multilineTextBox.SetBinding(RadRichTextBox.IsReadOnlyProperty,
                                        new Binding
                                        {
                                            Path =
                                                new PropertyPath(GetIsReadOnlyPropertyName(descriptor.PropertyName)),
                                            Mode = BindingMode.TwoWay
                                        });

            multilineTextBox.SetBinding(UIElement.VisibilityProperty,
                                        new Binding
                                        {
                                            Path =
                                                new PropertyPath(GetIsVisiblePropertyName(descriptor.PropertyName)),
                                            Mode = BindingMode.TwoWay,
                                            Converter = new BoolToVisibilityConverter(),
                                            ConverterParameter = descriptor.PropertyName
                                        });

            return ctrl;
        }

 

 

Thank you,
John 

[Boby]

Hi John,

I was not able to reproduce the problem on my side, so I suppose it could be related to a specific styling applied in your application - for example through explicit styles. We have seen similar problems for example when there is implicit styling for TextBlocks - and as RadRichTextBox uses TextBlock to visualize the text lines, inconsistencies could arise.

Another possibility is that the problem is bound to a specific RadDocument content (as the document contains styles and other properties that could affect the layout). From the sample code you send here, it seems that you are using TxtFormatProvider, so this shouldn't be the problem, but is another clue that can help you trace the issue.

That said, could you try to isolate the problem in a separate application and send it to us for further investigation? Looking forward to your reply.

Regards,
Boby
Telerik