My.Computer.Mouse.WheelScrollLines Property
Gets a number that indicates how much to scroll when the mouse wheel is rotated one notch.
' Usage
Dim value As Integer = My.Computer.Mouse.WheelScrollLines
' Declaration
Public ReadOnly Property WheelScrollLines As Integer
Property Value
An Integer that indicates how much to scroll when the mouse wheel is rotated one notch. A positive value indicates scrolling by that number of lines, while a negative value indicates scrolling by one screen at a time.
Exceptions
The following conditions can cause an exception:
The computer has no mouse installed (InvalidOperationException).
The mouse has no scroll wheel (InvalidOperationException).
Remarks
You can use this property to determine how many lines to scroll up or down in a multi-line control that has a scroll bar.
The My.Computer.Mouse.WheelScrollLines property provides functionality similar to the MouseWheelScrollLines property.
Because this property throws an exception if the mouse does not have a scroll wheel, you should make sure a mouse has a scroll wheel by checking the My.Computer.Mouse.WheelExists property.
This property provides information about the computer that runs the code.
Example
This example determines if the mouse has a scroll wheel and uses the My.Computer.Mouse.WheelExists property to determine how much to scroll when the mouse wheel is rotated.
If My.Computer.Mouse.WheelExists Then
Dim lines As Integer = My.Computer.Mouse.WheelScrollLines
If lines > 0 Then
MsgBox("Application scrolls " & _
lines & " line(s) for each wheel turn.")
Else
MsgBox("Application scrolls " & _
(-lines) & " page(s) for each wheel turn.")
End If
Else
MsgBox("Mouse has no scroll wheel.")
End If
Requirements
Namespace:Microsoft.VisualBasic.Devices
Class:Mouse
Assembly: Visual Basic Runtime Library (in Microsoft.VisualBasic.dll)
Availability by Project Type
Project type |
Available |
|---|---|
Windows Application |
Yes |
Class Library |
Yes |
Console Application |
Yes |
Windows Control Library |
Yes |
Web Control Library |
No |
Windows Service |
Yes |
Web Site |
No |
Permissions
No permissions are required.