public void performScrollVertical(ScrollEventType type)
{
int sbfromScrollEventType = this.getSBFromScrollEventType(type);
if (sbfromScrollEventType != -1)
{
ScrollablePanel.SendMessage(base.Handle, 277u, (UIntPtr)((ulong)((long)sbfromScrollEventType)), (IntPtr)0);
}
}
private ScrollEventType getScrollEventType(IntPtr wParam)
{
ScrollEventType result;
switch (ScrollablePanel.LoWord((int)wParam))
{
case 0:
result = ScrollEventType.SmallDecrement;
break;
case 1:
result = ScrollEventType.SmallIncrement;
break;
case 2:
result = ScrollEventType.LargeDecrement;
break;
case 3:
result = ScrollEventType.LargeIncrement;
break;
case 4:
result = ScrollEventType.ThumbPosition;
break;
case 5:
result = ScrollEventType.ThumbTrack;
break;
case 6:
result = ScrollEventType.First;
break;
case 7:
result = ScrollEventType.Last;
break;
case 8:
result = ScrollEventType.EndScroll;
break;
default:
result = ScrollEventType.EndScroll;
break;
}
return(result);
}
protected override void WndProc(ref Message msg)
{
base.WndProc(ref msg);
if (!(msg.HWnd != base.Handle))
{
int num = msg.Msg;
switch (num)
{
case 276:
try
{
ScrollEventType scrollEventType = this.getScrollEventType(msg.WParam);
ScrollEventArgs e = new ScrollEventArgs(scrollEventType, ScrollablePanel.GetScrollPos(base.Handle, 0));
this.ScrollHorizontal(this, e);
}
catch (Exception)
{
}
break;
case 277:
try
{
ScrollEventType scrollEventType = this.getScrollEventType(msg.WParam);
ScrollEventArgs e = new ScrollEventArgs(scrollEventType, ScrollablePanel.GetScrollPos(base.Handle, 1));
this.ScrollVertical(this, e);
}
catch (Exception)
{
}
break;
default:
if (num == 522)
{
if (this.VisibleAutoScrollVertical)
{
try
{
int delta = ScrollablePanel.HiWord((int)msg.WParam);
int y = ScrollablePanel.HiWord((int)msg.LParam);
int x = ScrollablePanel.LoWord((int)msg.LParam);
num = ScrollablePanel.LoWord((int)msg.WParam);
MouseButtons button;
if (num <= 16)
{
switch (num)
{
case 1:
button = MouseButtons.Left;
goto IL_103;
case 2:
button = MouseButtons.Right;
goto IL_103;
default:
if (num == 16)
{
button = MouseButtons.Middle;
goto IL_103;
}
break;
}
}
else
{
if (num == 32)
{
button = MouseButtons.XButton1;
goto IL_103;
}
if (num == 64)
{
button = MouseButtons.XButton2;
goto IL_103;
}
}
button = MouseButtons.None;
IL_103:
MouseEventArgs e2 = new MouseEventArgs(button, 1, x, y, delta);
this.ScrollMouseWheel(this, e2);
}
catch (Exception)
{
}
}
}
break;
}
}
}