Get FontWeight/FontStyle/TextDecorations from WPF RichTextBox

Question

How can I detect the current text formatting at the cursor position in a WPF RichTextBox?

Answer 1

Here is a solution that determines FontWeight, FontStyle, TextDecorations (strikethrough, underline) and Super- and Subscripts.

        TextRange textRange = new TextRange(rtb.Selection.Start, rtb.Selection.End);

        bool IsTextUnderline = false;
        bool IsTextStrikethrough = false;
        bool IsTextBold = false;
        bool IsTextItalic = false;
        bool IsSuperscript = false;
        bool IsSubscript = false;

        // determine underline property
        if (textRange.GetPropertyValue(Inline.TextDecorationsProperty).Equals(TextDecorations.Strikethrough))
            IsTextStrikethrough = true; // all underlined   
        else if (textRange.GetPropertyValue(Inline.TextDecorationsProperty).Equals(TextDecorations.Underline))
            IsTextUnderline = true; // all strikethrough

        // determine bold property
        if (textRange.GetPropertyValue(Inline.FontWeightProperty).Equals(FontWeights.Bold))
            IsTextBold = true; // all bold

        // determine if superscript or subscript
        if (textRange.GetPropertyValue(Inline.BaselineAlignmentProperty).Equals(BaselineAlignment.Subscript))
            IsSubscript = true; // all subscript
        else if (textRange.GetPropertyValue(Inline.BaselineAlignmentProperty).Equals(BaselineAlignment.Superscript))
            IsSuperscript = true; // all superscript