private void RecalcScrollBars()
{
Rectangle vsize = _control.VirtualSize;
float zoom = _control.Zoom;
//int hLargeChange = _control.GetScrollLargeChange(ScrollOrientation.HorizontalScroll);
//int vLargeChange = _control.GetScrollLargeChange(ScrollOrientation.VerticalScroll);
//int hSmallChange = _control.GetScrollSmallChange(ScrollOrientation.HorizontalScroll);
//int vSmallChange = _control.GetScrollSmallChange(ScrollOrientation.VerticalScroll);
bool hEnabled = _control.GetScrollEnabled(ScrollOrientation.HorizontalScroll);
bool vEnabled = _control.GetScrollEnabled(ScrollOrientation.VerticalScroll);
int width = _control.Control.Width;
int height = _control.Control.Height;
if (AutoShowScrollbars)
{
int vwidth = (int)(vsize.Width * zoom);
int vheight = (int)(vsize.Height * zoom);
int hSpan = tableLayoutPanel1.GetColumnSpan(panel1);
int vSpan = tableLayoutPanel1.GetRowSpan(panel1);
int minWidth = (hSpan == 1) ? _control.Control.Width : _control.Control.Width - _vScrollBar.Width;
int minHeight = (vSpan == 1) ? _control.Control.Height : _control.Control.Height - _hScrollBar.Height;
int maxWidth = minWidth + _vScrollBar.Width;
int maxHeight = minHeight + _hScrollBar.Height;
if (maxWidth >= vwidth && maxHeight >= vheight)
{
ShowHScrollBar(false);
ShowVScrollBar(false);
width = maxWidth;
height = maxHeight;
}
else if (maxWidth >= vwidth)
{
ShowVScrollBar(true);
width = minWidth;
if (minWidth >= vwidth || _control.WidthSynced)
{
ShowHScrollBar(false);
height = maxHeight;
}
else
{
ShowHScrollBar(true);
height = minHeight;
}
}
else if (maxHeight >= vheight)
{
ShowHScrollBar(true);
height = minHeight;
if (minHeight >= vheight || _control.HeightSynced)
{
ShowVScrollBar(false);
width = maxWidth;
}
else
{
ShowVScrollBar(true);
width = minWidth;
}
}
else
{
ShowHScrollBar(true);
ShowVScrollBar(true);
width = minWidth;
height = minHeight;
}
}
// Update scrollbar properties
int hSmallChange = width / 10;
int vSmallChange = height / 10;
int hLargeChange = (int)(width / 1.5);
int vLargeChange = (int)(height / 1.5);
_hScrollBar.Minimum = 0;
_vScrollBar.Minimum = 0;
_hScrollBar.Maximum = (width > vsize.Width * zoom) ? 0
: (int)(((vsize.Width + hLargeChange) * zoom - width) / zoom);
_vScrollBar.Maximum = (height > vsize.Height * zoom) ? 0
: (int)(((vsize.Height + vLargeChange) * zoom - height) / zoom);;
_hScrollBar.SmallChange = hSmallChange;
_vScrollBar.SmallChange = vSmallChange;
_hScrollBar.LargeChange = hLargeChange;
_vScrollBar.LargeChange = vLargeChange;
_hScrollBar.Value = Math.Min(_hScrollBar.Value, Math.Max(0, _hScrollBar.Maximum - _hScrollBar.LargeChange));
_vScrollBar.Value = Math.Min(_vScrollBar.Value, Math.Max(0, _vScrollBar.Maximum - _vScrollBar.LargeChange));
if (_hScrollBar.Maximum <= 0)
{
_hScrollBar.Maximum = 0;
_hScrollBar.Value = 0;
_hScrollBar.Enabled = false;
}
else
{
_hScrollBar.Enabled = true & hEnabled;
}
if (_vScrollBar.Maximum <= 0)
{
_vScrollBar.Maximum = 0;
_vScrollBar.Value = 0;
_vScrollBar.Enabled = false;
}
else
{
_vScrollBar.Enabled = true & vEnabled;
}
if (_hScrollBar.Value != _control.GetScrollValue(ScrollOrientation.HorizontalScroll))
{
_control.SetScrollValue(ScrollOrientation.HorizontalScroll, _hScrollBar.Value);
}
if (_vScrollBar.Value != _control.GetScrollValue(ScrollOrientation.VerticalScroll))
{
_control.SetScrollValue(ScrollOrientation.VerticalScroll, _vScrollBar.Value);
}
}
