WPF: Get “wrapped” text out of a textbox

Question

Is there a way in WPF to get the text formatted as it display on the textbox when TextWrapping=\"Wrap\"?

Answer 1

Here's how to get the complete text with apparent line breaks.

Note:

• Include the following classes from Advanced Text Formatting Example in your project:
  • CustomTextSource
  • FontRendering
  • GenericTextProperties
• There are some limitations which are mentioned in CustomTextSource class. However, I believe your requirements aren't impacted by those limitations.
• These are just examples. You may want to modify code as per your needs.
• The code still uses a hack (although a decent one) - InputTextBox.ViewportWidth. You may want to test if the final output is exactly as desired.

See: Advanced Text Formatting and Advanced Text Formatting Example

Sample Code
XAML:

Codebehind:

private void CopyButton_Click(object sender, RoutedEventArgs e)
{
    List stringList = GetTextAsStringList();
    StringBuilder sb = new StringBuilder();
    foreach (string s in stringList)
    {
        sb.Append(s);
        sb.Append("\r\n");
    }

    Clipboard.SetData(System.Windows.DataFormats.Text, sb.ToString());

    FormattedDisplayTextBox.Clear();
    FormattedDisplayTextBox.Text = sb.ToString();
}

private List GetTextAsStringList()
{
    List stringList = new List();
    int pos = 0;
    string inputText = InputTextBox.Text;

    CustomTextSource store = new CustomTextSource();
    store.Text = inputText;
    store.FontRendering = new FontRendering(InputTextBox.FontSize,
                                            InputTextBox.TextAlignment,
                                            null,
                                            InputTextBox.Foreground,
                                            new Typeface(InputTextBox.FontFamily,
                                                InputTextBox.FontStyle,
                                                InputTextBox.FontWeight,
                                                InputTextBox.FontStretch));

    using (TextFormatter formatter = TextFormatter.Create())
    {
        while (pos < store.Text.Length)
        {
            using (TextLine line = formatter.FormatLine(store,
                                    pos,
                                    InputTextBox.ViewportWidth,
                                    new GenericTextParagraphProperties(
                                        store.FontRendering),
                                    null))
            {
                stringList.Add(inputText.Substring(pos, line.Length - 1));
                pos += line.Length;
            }
        }
    }

    return stringList;
}