diff --git a/.semver.txt b/.semver.txt
index b112f91..c787b21 100644
--- a/.semver.txt
+++ b/.semver.txt
@@ -1 +1 @@
-1.0.21
+1.0.22
diff --git a/src/MonsterMonitor/MonsterMonitor.csproj b/src/MonsterMonitor/MonsterMonitor.csproj
index 14abc3d..1eb9296 100644
--- a/src/MonsterMonitor/MonsterMonitor.csproj
+++ b/src/MonsterMonitor/MonsterMonitor.csproj
@@ -6,10 +6,10 @@
7.3
MonsterMonitor
devenv
- 1.0.21
- 1.0.21
- 1.0.21
- 1.0.21
+ 1.0.22
+ 1.0.22
+ 1.0.22
+ 1.0.22
diff --git a/src/MonsterMonitor/UI/MainForm.cs b/src/MonsterMonitor/UI/MainForm.cs
index 081f158..7370817 100644
--- a/src/MonsterMonitor/UI/MainForm.cs
+++ b/src/MonsterMonitor/UI/MainForm.cs
@@ -1,5 +1,6 @@
using System;
using System.Drawing;
+using System.Runtime.InteropServices;
using System.Threading.Tasks;
using System.Windows.Forms;
using MonsterMonitor.Models;
@@ -9,6 +10,9 @@ namespace MonsterMonitor.UI
{
public sealed class MainForm : Form
{
+ private const int EmGetFirstVisibleLine = 0x00CE;
+ private const int EmLineScroll = 0x00B6;
+
private readonly RichTextBox _console = new RichTextBox();
private readonly Button _btnSettings = new Button();
private readonly Button _btnExit = new Button();
@@ -192,14 +196,49 @@ namespace MonsterMonitor.UI
return;
}
+ var wasNearBottom = IsConsoleNearBottom();
+ var firstVisibleLineBeforeAppend = GetFirstVisibleLine(_console);
+
_console.SelectionStart = _console.TextLength;
_console.SelectionLength = 0;
_console.SelectionColor = GetColor(entry.Level);
_console.AppendText($"[{entry.Timestamp:HH:mm:ss}] [{entry.Level}] {entry.Message}{Environment.NewLine}");
_console.SelectionColor = _console.ForeColor;
- _console.ScrollToCaret();
+
+ if (wasNearBottom)
+ {
+ _console.ScrollToCaret();
+ return;
+ }
+
+ var firstVisibleLineAfterAppend = GetFirstVisibleLine(_console);
+ var linesToRestore = firstVisibleLineBeforeAppend - firstVisibleLineAfterAppend;
+ if (linesToRestore != 0)
+ {
+ SendMessage(_console.Handle, EmLineScroll, IntPtr.Zero, (IntPtr)linesToRestore);
+ }
}
+ private bool IsConsoleNearBottom()
+ {
+ if (_console.TextLength == 0)
+ {
+ return true;
+ }
+
+ var bottomLeftPoint = new Point(1, Math.Max(0, _console.ClientSize.Height - 1));
+ var lastVisibleCharIndex = _console.GetCharIndexFromPosition(bottomLeftPoint);
+ return lastVisibleCharIndex >= _console.TextLength - 2;
+ }
+
+ private static int GetFirstVisibleLine(RichTextBox richTextBox)
+ {
+ return SendMessage(richTextBox.Handle, EmGetFirstVisibleLine, IntPtr.Zero, IntPtr.Zero).ToInt32();
+ }
+
+ [DllImport("user32.dll", CharSet = CharSet.Auto)]
+ private static extern IntPtr SendMessage(IntPtr hWnd, int msg, IntPtr wParam, IntPtr lParam);
+
private void ConfigureUpdateTimer()
{
_updateTimer.Interval = (int)TimeSpan.FromHours(1).TotalMilliseconds;