My.Computer.Mouse.WheelExists Property

Gets a Boolean that indicates if the mouse has a scroll wheel.

' Usage
Dim value As Boolean = My.Computer.Mouse.WheelExists
' Declaration
Public ReadOnly Property WheelExists As Boolean

Property Value

A Boolean with value True if the mouse has a scroll wheel; otherwise False.

Exceptions

The following condition can cause an exception:

• The computer has no mouse installed (InvalidOperationException).

Remarks

The My.Computer.Mouse.WheelExists property provides functionality similar to the MouseWheelPresent property.

You should check the value of the My.Computer.Mouse.WheelExists property before attempting to access the My.Computer.Mouse.WheelScrollLines Property, which throws an exception if the mouse does not have a scroll wheel.

The My.Computer.Mouse.WheelExists property provides information about the computer that runs the code.

Example

This example uses the My.Computer.Mouse.WheelExists property to determine if the mouse has a scroll wheel and 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

Permissions

No permissions are required.

See Also

Reference

My.Computer.Mouse Object

My.Computer.Mouse.WheelScrollLines Property

Mouse.WheelExists