//
// Vertical Scrollbar scroll event
//
private void vScrollBar_Scroll(object sender, ScrollEventArgs e)
{
offsetPoint.Y = e.NewValue;
Invalidate();
VerticalScroll?.Invoke(this, e);
}
//
// Mouse Move event handler. Used to drag the viewport
//
protected override void OnMouseMove(MouseEventArgs e)
{
base.OnMouseMove(e);
if (draggingViewport)
{
offsetPoint = new Point(-MousePosition.X + mouseOffset.X, -MousePosition.Y + mouseOffset.Y);
// Fire scroll events
HorizontalScroll?.Invoke(this, new ScrollEventArgs(ScrollEventType.ThumbPosition, offsetPoint.X));
VerticalScroll?.Invoke(this, new ScrollEventArgs(ScrollEventType.ThumbPosition, offsetPoint.Y));
ClipTransform();
Invalidate();
}
}
protected override void WndProc(ref Message m)
{
try {
if (m.Msg == WM_ERASEBKGND)
{
m.Result = IntPtr.Zero;
return;
}
if (m.Msg == 0x0115)
{
if (VerticalScroll != null)
{
VerticalScroll.Invoke(this, EventArgs.Empty);
}
}
base.WndProc(ref m);
} catch (AccessViolationException) { }
}