Append Text with Color?

Hi, new to this control. I’d like to append text to the box with a set color. With the WinForms RichTextBox I would do something like this:

        private void AppendTextToLogBoxWithColor(string text, Color color)
        {
            richTextBoxLog.SelectionStart = richTextBoxLog.TextLength;
            richTextBoxLog.SelectionLength = 0;

            richTextBoxLog.SelectionColor = color;
            richTextBoxLog.AppendText(text);
            richTextBoxLog.SelectionColor = richTextBoxLog.ForeColor;
        }

I was reading the documentation and saw that I can define custom syntax highlighting rules but is there a simple way to accomplish the same thing with AvalonEdit? Simply appending text with a specific color?

[derekantrican]

Ok, it took quite a bit of digging through the code base, messing around, etc but I found a basic enough example for my situation:

(Note that I am using a ported version of AvalonEdit: AvaloniaEdit])

RichTextModel richTextModel = new RichTextModel();

public MainWindow()
{
    InitializeComponent();

    TextEditor avaloniaEdit = this.FindControl<TextEditor>("log");
    avaloniaEdit.TextArea.TextView.LineTransformers.Add(new RichTextColorizer(richTextModel));
}

private void AppendTextWithColor(string text, Color color)
{
    TextEditor avaloniaEdit = this.FindControl<TextEditor>("log");
    avaloniaEdit.AppendText(text);
    richTextModel.ApplyHighlighting(avaloniaEdit.Text.Length - text.Length, text.Length, new HighlightingColor() { Foreground = new SimpleHighlightingBrush(color)});
}

Thanks for all your help!

[dgrunwald]

AvalonEdit has some classes that can help with implementing something like a rich text editor: ICSharpCode.AvalonEdit.Highlighting.RichTextModel is a data structure that can store font style/weight/color; RichTextColorizer can apply these during rendering. This way the colors don’t need to be part of the TextDocument. Note that you’ll manually have to hook these classes up to the editor.