From 0ff70fe612fbb306162b034c5c12ede5bc50a3d6 Mon Sep 17 00:00:00 2001
From: Sigmanor <sigmanor@gmail.com>
Date: Wed, 31 May 2017 22:10:09 +0300
Subject: [PATCH] Fixed #6

---
 Crypto Notepad/CustomRichTextBox.cs | 39 +++++++++++++++++------------
 Crypto Notepad/Form1.Designer.cs    |  4 +--
 2 files changed, 25 insertions(+), 18 deletions(-)

diff --git a/Crypto Notepad/CustomRichTextBox.cs b/Crypto Notepad/CustomRichTextBox.cs
index b100a6d..14dfc61 100644
--- a/Crypto Notepad/CustomRichTextBox.cs	
+++ b/Crypto Notepad/CustomRichTextBox.cs	
@@ -53,22 +53,29 @@ protected override void OnHandleCreated(EventArgs e)
             }
         }
 
-        //protected override void WndProc(ref Message m)
-        //{
-        //    if (m.Msg == WM_MOUSEWHEEL)
-        //    {
-        //        int scrollLines = SystemInformation.MouseWheelScrollLines;
-        //        for (int i = 0; i < scrollLines; i++)
-        //        {
-        //            if ((int)m.WParam > 0) // when wParam is greater than 0
-        //                SendMessage(this.Handle, WM_VSCROLL, (IntPtr)0, IntPtr.Zero); // scroll up 
-        //            else
-        //                SendMessage(this.Handle, WM_VSCROLL, (IntPtr)1, IntPtr.Zero); // else scroll down
-        //        }
-        //        return;
-        //    }
-        //    base.WndProc(ref m);
-        //}
+        protected override void WndProc(ref Message m)
+        {
+            if (m.Msg == WM_MOUSEWHEEL)
+            {
+                int scrollLines = SystemInformation.MouseWheelScrollLines;
+                for (int i = 0; i < scrollLines; i++)
+                {
+                    try
+                    {
+                        if ((int)m.WParam >= 0) // when wParam is greater than 0
+                            SendMessage(this.Handle, WM_VSCROLL, (IntPtr)0, IntPtr.Zero); // scroll up 
+                        else
+                            SendMessage(this.Handle, WM_VSCROLL, (IntPtr)1, IntPtr.Zero); // scroll down
+                    }
+                    catch (OverflowException)
+                    {
+                        SendMessage(this.Handle, WM_VSCROLL, (IntPtr)1, IntPtr.Zero); // scroll down
+                    }
+                }
+                return;
+            }
+            base.WndProc(ref m);
+        }
 
         /// <summary>
         ///  Search and Highlight all text in RichTextBox Control 
diff --git a/Crypto Notepad/Form1.Designer.cs b/Crypto Notepad/Form1.Designer.cs
index e3df925..a4ffb50 100644
--- a/Crypto Notepad/Form1.Designer.cs	
+++ b/Crypto Notepad/Form1.Designer.cs	
@@ -795,9 +795,9 @@ public void InitializeComponent()
             this.customRTB.ContextMenuStrip = this.contextMenuStrip1;
             this.customRTB.Font = new System.Drawing.Font("Microsoft Sans Serif", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(204)));
             this.customRTB.ForeColor = System.Drawing.SystemColors.WindowText;
-            this.customRTB.Location = new System.Drawing.Point(6, 52);
+            this.customRTB.Location = new System.Drawing.Point(6, 47);
             this.customRTB.Name = "customRTB";
-            this.customRTB.Size = new System.Drawing.Size(523, 247);
+            this.customRTB.Size = new System.Drawing.Size(529, 252);
             this.customRTB.TabIndex = 10;
             this.customRTB.Text = "";
             this.customRTB.LinkClicked += new System.Windows.Forms.LinkClickedEventHandler(this.customRTB_LinkClicked);