RichTextBox for WPF | ComponentOne
Working with WPF RichTextBox / Custom Command Bars / Formatting Functions
In This Topic
    Formatting Functions
    In This Topic

    The following code snippets demonstrate the code used for formatting functions in RichTextBox .NET and .NET Framework versions.

    You can also use Ctrl+a shortcut to select the entire text, Ctrl+b shortcut to bold the text, Ctrl+i shortcut to italicize the text, and Ctrl+u shortcut to underline the text.  

    Foreground Color

    C#
    Copy Code 
    rtb.Selection.Foreground = newSolidColorBrush(Colors.Red);
Highlight (background) color
rtb.Selection.InlineBackground = newSolidColorBrush(Colors.Yellow);
Toggle Bold
if(rtb.Selection.FontWeight != null&& rtb.Selection.FontWeight.Value.Weight == FontWeights.Bold.Weight)
{
    rtb.Selection.FontWeight = FontWeights.Normal;
}
else
{
    rtb.Selection.FontWeight = FontWeights.Bold;
}

    Toggle Italic

    C#
    Copy Code 
    if(rtb.Selection.FontStyle != null&& rtb.Selection.FontStyle == FontStyle.Italic)
{
    rtb.Selection.FontStyle = FontStyle.Normal;
}
else
{
    rtb.Selection.FontStyle = FontStyle.Italic;
}

    Toggle Underline

    C#
    Copy Code 
    var range = rtb.Selection;
var collection = new C1TextDecorationCollection();
if (range.TextDecorations == null)
{
    collection.Add(C1TextDecorations.Underline[0]);
}
else if (!range.TextDecorations.Contains(C1TextDecorations.Underline[0]))
{
    foreach (var decoration in range.TextDecorations)
        collection.Add(decoration);

    collection.Add(C1TextDecorations.Underline[0]);
}
else
{
    foreach (var decoration in range.TextDecorations)
        collection.Add(decoration);

    collection.Remove(C1TextDecorations.Underline[0]);
    if (collection.Count == 0)
        collection = null;
}
range.TextDecorations = collection;

    Clear Formatting

    C#
    Copy Code 
    rtb.Selection.InlineBackground = null;
rtb.Selection.Foreground = rtb.Foreground;
rtb.Selection.FontWeight = FontWeights.Normal;
rtb.Selection.FontStyle = FontStyle.Normal;
rtb.Selection.TextDecorations = null;

    You can also use Ctrl+a shortcut to select the entire text, Ctrl+b shortcut to bold the text, Ctrl+i shortcut to italicize the text, and Ctrl+u shortcut to underline the text.

     

    The following code implements Selection, Bold, Italics, and Underline formatting functions.

    C#
    Copy Code 
    private void RichTextBoxSelectionChanged(object sender, EventArgs e)
{ 
    var sel = _rtb.Selection;

    FontWeight? fw = _rtb.Selection.FontWeight;
    _btnBold.IsChecked = fw.HasValue && fw.Value == FontWeights.Bold;

    FontStyle? fs = _rtb.Selection.FontStyle;
    _btnItalic.IsChecked = fs.HasValue && fs.Value == FontStyles.Italic;

    _btnUnderline.IsChecked = (sel.TextDecorations != null);
}

private void UnderlineClick(object sender, RoutedEventArgs e)
{
    if (_btnUnderline.IsChecked.HasValue)
    {
        _rtb.Selection.TextDecorations = _btnUnderline.IsChecked.Value
        ? C1.WPF.RichTextBox.Documents.C1TextDecorations.Underline
       : null;
    }
}

private void ItalicClick(object sender, RoutedEventArgs e)
{
    FontStyle? fs = _rtb.Selection.FontStyle;
    _rtb.Selection.FontStyle = fs.HasValue && fs.Value == FontStyles.Italic
        ? FontStyles.Normal
        : FontStyles.Italic;
}

private void BoldClick(object sender, RoutedEventArgs e)
{
    FontWeight? fw = _rtb.Selection.FontWeight;
    _rtb.Selection.FontWeight = fw.HasValue && fw.Value == FontWeights.Bold
        ? FontWeights.Normal
        : FontWeights.Bold;