private void ScrollVisible(int index, int deltaY)
{
int visibleY = Math.Max(0, index - _location.Y);
if (visibleY <= _visibleCount)
{
Rectangle visible = DisplayRectangle;
RECT scroll = UnsafeUtilities.RECTFromLTRB(visible.X, visibleY * _rowHeight, visible.Right, Math.Max(visible.Bottom, visible.Bottom + _rowHeight));
RECT clip = UnsafeUtilities.RECTFromRectangle(visible);
UnsafeNativeMethods.ScrollWindowEx(this.Handle, 0, deltaY * _rowHeight, ref scroll, ref clip, IntPtr.Zero, IntPtr.Zero, 2 /* SW_INVALIDATE */ | 4 /* SW_ERASE */);
}
}
private void NavigateTo(Point location)
{
location.X = Constrain(location.X, _hScrollBar.Minimum, _hScrollBar.Maximum);
location.Y = Math.Max(0, Math.Min(_exposed.Count, location.Y + (_visibleCount - 1)) - (_visibleCount - 1));
if (location != _location)
{
Point delta = new Point((_location.X - location.X) * _indent, (_location.Y - location.Y) * _rowHeight);
_location = location;
_hScrollBar.Value = _location.X;
_vScrollBar.Value = _location.Y;
UpdateDesigners(true); // even if layout weren't supressed, there is no guarantee that a layout will be performed
RECT rect = UnsafeUtilities.RECTFromRectangle(DisplayRectangle);
UnsafeNativeMethods.ScrollWindowEx(this.Handle, delta.X, delta.Y, ref rect, ref rect, IntPtr.Zero, IntPtr.Zero, 2 /* SW_INVALIDATE */);
PerformLayout();
}
}
private void NavigateTo(Point location)
{
location.X = Constrain(location.X, _hScrollBar.Minimum, _hScrollBar.Maximum);
location.Y = Constrain(location.Y, _vScrollBar.Minimum, _vScrollBar.Maximum);
if (location != _location)
{
Point delta = new Point(SumWidths(_location.X, location.X), (_location.Y - location.Y) * _rowHeight);
_location = location;
_hScrollBar.Value = _location.X;
_vScrollBar.Value = _location.Y;
// Scroll vertically (seperate from horizontal because it does not affect header
RECT rect = UnsafeUtilities.RECTFromRectangle(DataRectangle);
UnsafeNativeMethods.ScrollWindowEx(this.Handle, 0, delta.Y, ref rect, ref rect, IntPtr.Zero, IntPtr.Zero, 2 /* SW_INVALIDATE */);
// Scroll horizontally
rect = UnsafeUtilities.RECTFromRectangle(DisplayRectangle);
UnsafeNativeMethods.ScrollWindowEx(this.Handle, delta.X, 0, ref rect, ref rect, IntPtr.Zero, IntPtr.Zero, 2 /* SW_INVALIDATE */);
PerformLayout();
}
}