issue #16 work around

README.md

@@ -30,6 +30,7 @@ https://github.com/Seelge/TrackballScroll/releases/latest
 - Build the solution
 
 ###### Version history
+- v4 prevents #16... sort of (middle clicks can be disabled if necessary using the tray menu).
 - v3 feature #12: Allows to choose which X-buttons are used and saves the settings. Also changed versioning scheme to single numbers.
 - v2.1.2 fixes #14. Compatibility with Windows 10 versions of 2017.
 - v2.1.1 fixes issues #8, #9, #10. Instead of calculating the scaled coordinates, both original and scaled coordinates are memorized.

TrackballScroll/App.config

@@ -19,6 +19,9 @@
             <setting name="preferAxis" serializeAs="String">
                 <value>True</value>
             </setting>
+            <setting name="emulateMiddleButton" serializeAs="String">
+                <value>True</value>
+            </setting>
         </TrackballScroll.Properties.Settings>
     </userSettings>
 </configuration>

TrackballScroll/Properties/Resources.resx

@@ -140,7 +140,7 @@
     <value>Prefer vertical/horizontal movement</value>
   </data>
   <data name="TextMessageBoxAbout" xml:space="preserve">
-    <value>TrackballScroll v3
+    <value>TrackballScroll v4
 Copyright (c) 2016, 2017 Martin Seelge
 Project URL: https://github.com/Seelge/TrackballScroll/
 
@@ -159,4 +159,7 @@ https://github.com/Seelge/TrackballScroll/blob/master/LICENSE</value>
   <data name="TextButtonHookUseX2" xml:space="preserve">
     <value>Use button X2</value>
   </data>
+  <data name="TextButtonEmulateMiddleButton" xml:space="preserve">
+    <value>Emulate middle button when not scrolling</value>
+  </data>
 </root>

TrackballScroll/Properties/Settings.settings

@@ -11,5 +11,8 @@
     <Setting Name="preferAxis" Type="System.Boolean" Scope="User">
       <Value Profile="(Default)">True</Value>
     </Setting>
+    <Setting Name="emulateMiddleButton" Type="System.Boolean" Scope="User">
+      <Value Profile="(Default)">True</Value>
+    </Setting>
   </Settings>
 </SettingsFile>

TrackballScroll/Sources/MainForm.cs

@@ -30,6 +30,7 @@ public static void Main()
         private MenuItem itemUseX1;
         private MenuItem itemUseX2;
         private MenuItem itemPreferAxis;
+        private MenuItem itemEmulateMiddleButton;
         private MouseHookTrackballScroll mouseHook;
 
         public MainForm()
@@ -58,11 +59,17 @@ public MainForm()
             itemPreferAxis.Checked = preferAxis;
             mouseHook.preferAxisMovement = preferAxis;
 
+            var useMiddleButton = Properties.Settings.Default.emulateMiddleButton;
+            itemEmulateMiddleButton = new MenuItem(Properties.Resources.TextButtonEmulateMiddleButton, OnToggleEmulateMiddleButton);
+            itemEmulateMiddleButton.Checked = useMiddleButton;
+            mouseHook.emulateMiddleButton = useMiddleButton;
+
             ContextMenu trayMenu = new ContextMenu();
             trayMenu.MenuItems.Add(itemEnabled);
             trayMenu.MenuItems.Add(itemUseX1);
             trayMenu.MenuItems.Add(itemUseX2);
             trayMenu.MenuItems.Add(itemPreferAxis);
+            trayMenu.MenuItems.Add(itemEmulateMiddleButton);
             trayMenu.MenuItems.Add(Properties.Resources.TextButtonAbout, OnAbout);
             trayMenu.MenuItems.Add(Properties.Resources.TextButtonExit, OnExit);
 
@@ -147,6 +154,14 @@ private void OnToggleAxis(object sender, EventArgs e)
             Properties.Settings.Default.Save();
         }
 
+        private void OnToggleEmulateMiddleButton(object sender, EventArgs e)
+        {
+            itemEmulateMiddleButton.Checked = !itemEmulateMiddleButton.Checked;
+            mouseHook.emulateMiddleButton = itemEmulateMiddleButton.Checked;
+            Properties.Settings.Default.emulateMiddleButton = itemEmulateMiddleButton.Checked;
+            Properties.Settings.Default.Save();
+        }
+
         private void OnAbout(object sender, EventArgs e)
         {
             MessageBox.Show(Properties.Resources.TextMessageBoxAbout, Properties.Resources.TextTitle);

TrackballScroll/Sources/MouseHookTrackballScroll.cs

@@ -33,6 +33,7 @@ class MouseHookTrackballScroll : MouseHookBase, IDisposable
         private System.Timers.Timer timer { get; set; }
         public bool useX1 { get; set; }
         public bool useX2 { get; set; }
+        public bool emulateMiddleButton { get; set; }
 
         enum State
         {
@@ -105,8 +106,12 @@ public override IntPtr HookCallback(int nCode, IntPtr wParam, IntPtr lParam)
                         {
                             break;
                         }
-                        preventCallNextHookEx = true;
                         _state = State.NORMAL;
+                        if(!emulateMiddleButton)
+                        {
+                            break;
+                        }
+                        preventCallNextHookEx = true;
                         WinAPI.INPUT[] input = new WinAPI.INPUT[2];
                         input[0].type = WinAPI.INPUT_MOUSE;
                         input[0].mi.dx = p.pt.x;

TrackballScroll/TrackballScroll.csproj

@@ -24,7 +24,7 @@
     <UpdateRequired>false</UpdateRequired>
     <MapFileExtensions>true</MapFileExtensions>
     <ApplicationRevision>0</ApplicationRevision>
-    <ApplicationVersion>3.0.0.%2a</ApplicationVersion>
+    <ApplicationVersion>4.0.0.%2a</ApplicationVersion>
     <UseApplicationTrust>false</UseApplicationTrust>
     <BootstrapperEnabled>true</BootstrapperEnabled>
   </PropertyGroup>