[RESOLVED] How to raise event trapping mouse wheel scroll?

Looks like only way is to perform a hook. I dont want to use WH_MOUSE_LL, so how about instead overriding wndProc in my user control to trap WM_MOUSEWHEEL, then just raise a custom event with the delta value? Is this possible. Is this how I should do it?

Ok here's my override of wndProc. If I left click on my user control white space(where I dont have any child controls) I get my messagebox for left mouse click. If I scroll the wheel in same area, It doesnt see it. I assume its because when you click the user control has focus for a moment. Ok, I'll live with not being able to scroll when mouse is over the user control white space. So I commented out this statement if (msg.HWnd != this.Handle) so that all messages will be received. But the problem persists. Even if I click on the child object to bring focus like a text box, it still doesnt see the WM_MOUSEWHEEL, or WM_LBUTTONDOWN

Code:

---

protected override void WndProc(ref Message msg)
 
{
 
base.WndProc(ref msg);
 
if (msg.HWnd != this.Handle)
 
return;
 
switch (msg.Msg)
 
{
 
case WM_LBUTTONDOWN:
 
MessageBox.Show("Left Button Down");
 
break;
 
case WM_MOUSEWHEEL:
 
MessageBox.Show("Scroll!!!!!");
 
try
 
{
 
int zDelta = HiWord((int)msg.WParam);
 
int y = HiWord((int)msg.LParam);
 
int x = LoWord((int)msg.LParam);
 
System.Windows.Forms.MouseButtons butt;
 
switch (LoWord((int)msg.WParam))
 
{
 
case MK_LBUTTON:
 
butt = System.Windows.Forms.MouseButtons.Left;
 
break;
 
case MK_MBUTTON:
 
butt = System.Windows.Forms.MouseButtons.Middle;
 
break;
 
case MK_RBUTTON:
 
butt = System.Windows.Forms.MouseButtons.Right;
 
break;
 
case MK_XBUTTON1:
 
butt = System.Windows.Forms.MouseButtons.XButton1;
 
break;
 
case MK_XBUTTON2:
 
butt = System.Windows.Forms.MouseButtons.XButton2;
 
break;
 
default:
 
butt = System.Windows.Forms.MouseButtons.None;
 
break;
 
}
 
System.Windows.Forms.MouseEventArgs arg0 = new System.Windows.Forms.MouseEventArgs(butt, 1, x, y, zDelta);
 
this.ScrollMouseWheel(this, arg0);
 
}
 
catch (Exception) { }
 
break;
 
 
 
default:
 
break;
 
}
 
}

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Ok, i'm getting close(I ditched the wndProc idea). In order to use the mousewheel to scroll the panel of user controls, the panel needs to have focus. So now I need to raise events from my user control that tell me when the mouse has entered visability of the labels. Then in my main form, I can trap those events, and set focus to the panel. Sounds pretty easy. Well for me and my NOOBNESS, its not. I am getting an error when trying to pass the mouse enter event for a label control. Here is my code.

Code:

---


publicevent System.EventHandler NoFocus;
 

privatevoid label2_MouseEnter(object sender, EventArgs e)
{
        NoFocus(sender,e); // Object reference not set to an instance of an object.
}


---

and I get this error

Quote:

---

Object reference not set to an instance of an object.

---

the arg sender shows the label control that generated the event, and e is empty. NoFocus = null. I think this is the problem. How do I fix it?

Please help....... This has got to be an easy one for you guys.

I tried adding this statement

newDetails.NoFocus += newEventArgs(NoFocus);

when I create an instance of my user control(named newDetails) and I get a compile error.

Quote:

---

Error 3 No overload for method 'EventArgs' takes '1' arguments

---

I have defined NoFocus as this.....

Code:

---

privatevoid NoFocus(object sender, EventArgs e)
{
        splitContainer2.Panel2.Focus();
}

---

I'm stupid. I knew it was something easy.

newDetails.NoFocus += newEventArgs(NoFocus);

Needed to be........

newDetails.NoFocus += newEventHandler(NoFocus);

Works great now. Got my panel scrolling the user controls.