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March 20, 2022 22:33
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Snippet to turn a ListBox into a colored logs renderer
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| public Form1() | |
| { | |
| InitializeComponent(); | |
| // set custom draw method | |
| List_EventsLog.DrawMode = DrawMode.OwnerDrawVariable; | |
| List_EventsLog.DrawItem += List_EventsLog_DrawItem; | |
| } | |
| /// <summary> | |
| /// Draw an item in the events list. | |
| /// Implements color based on log level. | |
| /// </summary> | |
| private void List_EventsLog_DrawItem(object sender, DrawItemEventArgs e) | |
| { | |
| e.DrawBackground(); | |
| if (e.Index == -1) { return; } | |
| Graphics g = e.Graphics; | |
| string text = List_EventsLog.Items[e.Index].ToString() ?? ""; | |
| var fontBrush = new SolidBrush(e.ForeColor); | |
| var selected = (e.State.HasFlag(DrawItemState.Focus) || e.State.HasFlag(DrawItemState.Selected)); | |
| if (text.StartsWith(LogLevels.Notice.ToString())) | |
| { | |
| if (selected) | |
| { | |
| g.FillRectangle(new SolidBrush(Color.LightGreen), e.Bounds); | |
| fontBrush = new SolidBrush(Color.Black); | |
| } | |
| else | |
| { | |
| g.FillRectangle(new SolidBrush(Color.Green), e.Bounds); | |
| fontBrush = new SolidBrush(Color.White); | |
| } | |
| } | |
| else if (text.StartsWith(LogLevels.Warn.ToString())) | |
| { | |
| if (selected) { fontBrush = new SolidBrush(Color.Red); } | |
| g.FillRectangle(new SolidBrush(Color.Yellow), e.Bounds); | |
| } | |
| else if (text.StartsWith(LogLevels.Error.ToString())) | |
| { | |
| if (selected) { fontBrush = new SolidBrush(Color.Red); } | |
| g.FillRectangle(new SolidBrush(Color.Pink), e.Bounds); | |
| } | |
| else if (text.StartsWith(LogLevels.Debug.ToString())) | |
| { | |
| fontBrush = selected ? new SolidBrush(Color.White) : new SolidBrush(Color.Gray); | |
| } | |
| else if (text.StartsWith(LogLevels.Assert.ToString())) | |
| { | |
| g.FillRectangle(new SolidBrush(Color.DarkRed), e.Bounds); | |
| fontBrush = new SolidBrush(Color.White); | |
| } | |
| g.DrawString(text, e.Font, fontBrush, new PointF(e.Bounds.X, e.Bounds.Y)); | |
| e.DrawFocusRectangle(); | |
| } | |
| /// <summary> | |
| /// Write a message to events log. | |
| /// </summary> | |
| void WriteEventLog(string message, LogLevels logLevel) | |
| { | |
| // get formatted text | |
| var msgText = string.Format("{0,-6} | {1,-5} | {2, -16}", | |
| logLevel.ToString(), | |
| DateTime.Now.ToShortTimeString(), | |
| message); | |
| // add to log list | |
| if (logLevel != LogLevels.Trace) | |
| { | |
| List_EventsLog.Invoke((MethodInvoker)(() => | |
| { | |
| List_EventsLog.Items.Add(msgText); | |
| if (List_EventsLog.SelectedIndex == List_EventsLog.Items.Count - 2) | |
| { | |
| List_EventsLog.SelectedIndex = List_EventsLog.Items.Count - 1; | |
| } | |
| })); | |
| } | |
| } | |
| /// <summary> | |
| /// Log levels for event logs. | |
| /// </summary> | |
| public enum LogLevels | |
| { | |
| Trace, | |
| Debug, | |
| Info, | |
| Notice, | |
| Warn, | |
| Error, | |
| Assert | |
| } |
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Usage example:
WriteEventLog("Oh no!", LogLevels.Warn);Note: works best with monospace font.