private void UpdateControl(LoggingEvent loggingEvent)
{
// There may be performance issues if the buffer gets too long
// So periodically clear the buffer
if (richtextBox.TextLength > maxTextLength)
{
richtextBox.Clear();
richtextBox.AppendText(string.Format("(earlier messages cleared because log length exceeded maximum of {0})\n\r", maxTextLength));
}
// look for a style mapping
LevelTextStyle selectedStyle = levelMapping.Lookup(loggingEvent.Level) as LevelTextStyle;
if (selectedStyle != null)
{
// set the colors of the text about to be appended
if (!selectedStyle.BackgroundColor.IsEmpty)
{
richtextBox.SelectionBackColor = selectedStyle.BackgroundColor;
}
if (!selectedStyle.ForgroundColor.IsEmpty)
{
richtextBox.SelectionColor = selectedStyle.ForgroundColor;
}
// alter selection font as much as necessary
// missing settings are replaced by the font settings on the control
if (selectedStyle.Font != null)
{
// set Font Family, size and styles
richtextBox.SelectionFont = selectedStyle.Font;
}
else if (selectedStyle.PointSize > 0 && richtextBox.Font.SizeInPoints != selectedStyle.PointSize)
{
// use control's font family, set size and styles
float size = selectedStyle.PointSize > 0.0f ? selectedStyle.PointSize : richtextBox.Font.SizeInPoints;
richtextBox.SelectionFont = new Font(richtextBox.Font.FontFamily.Name, size, selectedStyle.FontStyle);
}
else if (richtextBox.Font.Style != selectedStyle.FontStyle)
{
// use control's font family and size, set styles
richtextBox.SelectionFont = new Font(richtextBox.Font, selectedStyle.FontStyle);
}
}
richtextBox.AppendText(RenderLoggingEvent(loggingEvent));
}
/// <summary>
/// Add a mapping of level to text style - done by the config file
/// </summary>
/// <param name="mapping">The mapping to add</param>
/// <remarks>
/// <para>
/// Add a <see cref="LevelTextStyle"/> mapping to this appender.
/// Each mapping defines the text style for a level.
/// </para>
/// </remarks>
public void AddMapping(LevelTextStyle mapping)
{
_levelMapping.Add(mapping);
}