From 1f28b5d32f94e0b9157f8176c6fb36aa06b9583e Mon Sep 17 00:00:00 2001
From: Markus Hofknecht <Markus@Hofknecht.eu>
Date: Fri, 13 Mar 2020 14:31:31 +0100
Subject: [PATCH] #NewBug Fixed slow scrolling

---
 Controls/Menu.cs                 | 10 ++++++++--
 Helper/DataGridViewExtensions.cs | 32 ++++++++++++++++++++++++++++++++
 SystemTrayMenu.cs                |  6 ++----
 SystemTrayMenu.csproj            |  1 +
 4 files changed, 43 insertions(+), 6 deletions(-)
 create mode 100644 Helper/DataGridViewExtensions.cs

diff --git a/Controls/Menu.cs b/Controls/Menu.cs
index 9eec362..4114ba1 100644
--- a/Controls/Menu.cs
+++ b/Controls/Menu.cs
@@ -4,6 +4,7 @@ using System.Linq;
 using System.Reflection;
 using System.Windows.Forms;
 using SystemTrayMenu.Controls;
+using SystemTrayMenu.Helper;
 
 namespace SystemTrayMenu
 {
@@ -53,6 +54,9 @@ namespace SystemTrayMenu
             dgvCellStyle.SelectionBackColor = MenuDefines.FileHover;
             dgvCellStyle.SelectionForeColor = Color.Black;
             this.dgv.DefaultCellStyle = dgvCellStyle;
+
+            VScrollBar scrollBar = dgv.Controls.OfType<VScrollBar>().First();
+            scrollBar.MouseWheel += dgv_MouseWheel;
         }
 
         static void SetDoubleBuffer(Control ctl, bool DoubleBuffered)
@@ -209,7 +213,9 @@ namespace SystemTrayMenu
 
         private void AdjustDataGridViewSize()
         {
-            dgv.AutoResizeColumns();
+            //dgv.AutoResizeColumns(); //AutoResizeColumns slow ~45ms
+            DataGridViewExtensions.FastAutoSizeColumns(dgv);
+
             bool scrollbarShown = false;
             foreach (var scroll in dgv.Controls.OfType<VScrollBar>())
             {
@@ -254,7 +260,7 @@ namespace SystemTrayMenu
                 }
             }
 
-            dgv.PerformLayout();
+            Application.DoEvents();
             MouseWheel.Invoke();
         }
 
diff --git a/Helper/DataGridViewExtensions.cs b/Helper/DataGridViewExtensions.cs
new file mode 100644
index 0000000..c83f637
--- /dev/null
+++ b/Helper/DataGridViewExtensions.cs
@@ -0,0 +1,32 @@
+using System.Data;
+using System.Linq;
+using System.Windows.Forms;
+
+namespace SystemTrayMenu.Helper
+{
+    public static class DataGridViewExtensions
+    {
+        public static void FastAutoSizeColumns(this DataGridView dgv)
+        {
+            var rows = dgv.Rows
+               .Cast<DataGridViewRow>();
+            using (var gfx = dgv.CreateGraphics())
+            {
+                int i = 1;
+                gfx.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias;
+                float widthMax = dgv.Columns[i].HeaderCell.Size.Width;
+                foreach (DataGridViewRow row in rows)
+                {
+                    var checkWidth = gfx.MeasureString(
+                        row.Cells[i].Value.ToString() + "_",
+                        dgv.RowTemplate.DefaultCellStyle.Font).Width;
+                    if (checkWidth > widthMax)
+                    {
+                        widthMax = checkWidth;
+                    }
+                }
+                dgv.Columns[i].Width = (int)(widthMax + 0.5);
+            }
+        }
+    }
+}
diff --git a/SystemTrayMenu.cs b/SystemTrayMenu.cs
index 485907d..0dd2a0e 100644
--- a/SystemTrayMenu.cs
+++ b/SystemTrayMenu.cs
@@ -37,7 +37,7 @@ namespace SystemTrayMenu
         OpenCloseState openCloseState = OpenCloseState.Default;
 
         BackgroundWorker worker = new BackgroundWorker();
-        Screen screen = null;
+        Screen screen = Screen.PrimaryScreen;
 
         public SystemTrayMenu(ref bool cancelAppRun)
         {
@@ -124,8 +124,6 @@ namespace SystemTrayMenu
                     #endregion
 
                     openCloseState = OpenCloseState.Opening;
-                    screen = Screen.PrimaryScreen;
-
                     menuNotifyIcon.LoadingStart();
                     worker.RunWorkerAsync();
                 }
@@ -318,7 +316,7 @@ namespace SystemTrayMenu
                         widthPredecessors -= newWith;
                     }
                 }
-                else if (Screen.PrimaryScreen.Bounds.Width <
+                else if (screen.Bounds.Width <
                     widthPredecessors + menuPredecessor.Width + menu.Width)
                 {
                     directionToRight = true;
diff --git a/SystemTrayMenu.csproj b/SystemTrayMenu.csproj
index 5f8ee72..d8746c1 100644
--- a/SystemTrayMenu.csproj
+++ b/SystemTrayMenu.csproj
@@ -160,6 +160,7 @@
     <Compile Include="Controls\RowData.cs" />
     <Compile Include="Controls\AppContextMenu.cs" />
     <Compile Include="Helper\BringWindowToTop.cs" />
+    <Compile Include="Helper\DataGridViewExtensions.cs" />
     <Compile Include="Helper\File\IconReader.cs" />
     <Compile Include="Helper\File\FileIni.cs" />
     <Compile Include="Helper\File\FileLnk.cs" />