MouseWheel Event

[FYRe]

I am trying to create an event which, when you scroll the mouse wheel UPwards, an event occur, & when you scroll the mouse wheel DOWNwards, an event will occur.

 

Is anyone familiar with using MouseWheel Event, in VS 2003 ? or is there some other Event that can be used? I need example/s or maybe tutorial/s a.s.a.p. for my project.

 

thks,

FYRe

[PlausiblyDamp]

When you use the mouse wheel the MouseWheel event occurs, e.Delta tells you how much the wheel was turned by and the direction is indicated by the sign.

[rustyd]

Mousewheel event

 

This is from a VS 2002 app. The mousewheel event is not in the list of events but exists (found that on this site).

 Private Sub Form1_MouseWheel(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles MyBase.MouseWheel
   If e.Delta < 0 Then
     ' Routine when mouse scroll down
   Else
     ' Routine when mouse scroll up
   End If
 End Sub

[FYRe]

Mouse Wheel Event/ Rotation

 

This is from a VS 2002 app. The mousewheel event is not in the list of events but exists (found that on this site).

 Private Sub Form1_MouseWheel(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles MyBase.MouseWheel
   If e.Delta < 0 Then
     ' Routine when mouse scroll down
   Else
     ' Routine when mouse scroll up
   End If
 End Sub

 

 

 

thks... it works! Now I have another query,

But how do I know how many "notch" the wheel is rotated?

- Each mouse wheel rotation have a notch.

 

- How do I determine how many notches have been turned; both forward and backwards ?

 

:confused:

[rustyd]

Add this line of code and the delta value produced by scrolling will appear in your output window.

   Console.WriteLine("e.delta = " & e.Delta.ToString)

 

Mousewheel forward, or up, e.delta = 120;

Mousewheel backward, or down, e.delta = -120;

I noticed when I aggressively scrolled the value changed to 240 depending on the direction I scrolled.

 

From scrolling up and down I get the following output:

e.delta = 120

e.delta = 120

e.delta = 120

e.delta = 120

e.delta = 120

e.delta = 120

e.delta = 120

e.delta = 120

e.delta = 120

e.delta = 120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = 120

e.delta = 120

e.delta = 120

e.delta = 120

e.delta = 120

e.delta = 120

e.delta = 120

e.delta = 120

e.delta = 120

e.delta = 120

e.delta = 120

e.delta = 120

e.delta = 240

e.delta = 120

e.delta = 120

e.delta = 120

e.delta = 120

e.delta = 120

e.delta = 120

e.delta = 240

e.delta = 240

e.delta = 120

e.delta = 120

e.delta = 120

e.delta = 120

e.delta = 240

e.delta = 240

e.delta = 120

e.delta = 120

e.delta = 120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = 120

e.delta = 120

e.delta = 240

e.delta = 240

e.delta = 240

e.delta = 120

e.delta = 120

e.delta = 120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = 120

e.delta = 120

e.delta = 120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = 120

e.delta = 120

e.delta = 120

e.delta = 120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = 120

e.delta = 120

e.delta = 120

e.delta = 120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = 120

e.delta = 120

e.delta = 120

e.delta = 120

e.delta = 120

e.delta = 120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = 120

e.delta = 120

e.delta = 240

e.delta = 120

e.delta = 120

e.delta = -120

e.delta = -120

e.delta = -240

e.delta = -120

e.delta = -120

e.delta = 240

e.delta = 240

e.delta = 120

e.delta = 120

e.delta = 120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = 120

e.delta = 240

e.delta = 120

e.delta = 120

e.delta = 120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = -240

e.delta = -120

e.delta = -120

e.delta = 240

e.delta = 240

e.delta = 120

e.delta = 120

e.delta = 120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = -240

e.delta = -240

e.delta = -120

e.delta = -120

e.delta = 120

e.delta = 120

e.delta = 120

e.delta = 120

e.delta = 120

e.delta = 120

e.delta = 120

e.delta = 120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = 240

e.delta = 240

e.delta = 240

e.delta = 240

e.delta = 240

e.delta = 120

e.delta = 120

e.delta = 240

e.delta = 240

e.delta = 240

e.delta = 240

e.delta = 120

e.delta = 120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = -120

e.delta = 120

e.delta = 120

e.delta = 240

e.delta = 240

e.delta = 240

e.delta = 120

[FYRe]

Ok, let me get this clearly, you mentioned that:

 

Mousewheel forward, or up, e.delta = 120;

Mousewheel backward, or down, e.delta = -120

 

does a "Mousewheel forward/backward" means ONE notch of a Mouse Scroll? or generally scrolling the MouseWheel ?

 

Are the statements below TRUE ?

 

Meaning ONE notch forward: e.Delta = 120

TWO notch forward: e.Delta = 240

THREE notch forward: e.Delta = 360 etc...

 

Meaning ONE notch backward: e.Delta = -120

TWO notch backward: e.Delta = -240

THREE notch backward: e.Delta = -360 etc...

[rustyd]

I know that up is negative, down is positive. It seems (+/-) 120 is the magic number, but I also occassionaly received (+/-) 240 when I scrolled aggressively. I don't know where you're getting 360.

 

Basically, check for positive or negative to determine the direction of the scroll.

[Afraits]

According to ducumentation on MouseWheel event arguments, one mouse wheel click gives a delta of 120 (+ or -), 'aggressive scrolling' may then register more than 1 click between events being raised.