private void RemoveVScrollBar()
{
if (_VScrollBar != null)
{
Rectangle r = _VScrollBar.Bounds;
this.Controls.Remove(_VScrollBar);
_VScrollBar.Dispose();
_VScrollBar = null;
this.Invalidate(r);
_AutoScrollPosition.Y = 0;
if (m_ItemContainer != null)
m_ItemContainer.NeedRecalcSize = true;
}
}
private void UpdateScrollBars()
{
if (!_AutoScroll)
{
RemoveHScrollBar();
RemoveVScrollBar();
if (_Thumb != null)
{
this.Controls.Remove(_Thumb);
_Thumb.Dispose();
_Thumb = null;
}
return;
}
Rectangle innerBounds = ElementStyleLayout.GetInnerRect(this.BackgroundStyle, this.ClientRectangle);
// Check do we need vertical scrollbar
Size scrollSize = _AutoScrollMinSize;
if (scrollSize.Height > innerBounds.Height)
{
if (_VScrollBar == null)
{
_VScrollBar = new DevComponents.DotNetBar.VScrollBarAdv();
_VScrollBar.Appearance = _ScrollBarAppearance;
_VScrollBar.Width = SystemInformation.VerticalScrollBarWidth;
this.Controls.Add(_VScrollBar);
_VScrollBar.BringToFront();
_VScrollBar.Scroll += new ScrollEventHandler(VScrollBarScroll);
}
if (_VScrollBar.Minimum != 0)
_VScrollBar.Minimum = 0;
if (_VScrollBar.LargeChange != innerBounds.Height && innerBounds.Height > 0)
_VScrollBar.LargeChange = innerBounds.Height;
_VScrollBar.SmallChange = 22;
if (_VScrollBar.Maximum != _AutoScrollMinSize.Height)
_VScrollBar.Maximum = _AutoScrollMinSize.Height;
if (_VScrollBar.Value != -_AutoScrollPosition.Y)
_VScrollBar.Value = (Math.Min(_VScrollBar.Maximum, Math.Abs(_AutoScrollPosition.Y)));
}
else
RemoveVScrollBar();
// Check horizontal scrollbar
if (scrollSize.Width > innerBounds.Width)
{
if (_HScrollBar == null)
{
_HScrollBar = new DevComponents.DotNetBar.ScrollBar.HScrollBarAdv();
_HScrollBar.Appearance = _ScrollBarAppearance;
_HScrollBar.Height = SystemInformation.HorizontalScrollBarHeight;
this.Controls.Add(_HScrollBar);
_HScrollBar.BringToFront();
_HScrollBar.Scroll += new ScrollEventHandler(HScrollBarScroll);
}
if (_HScrollBar.Minimum != 0)
_HScrollBar.Minimum = 0;
if (_HScrollBar.LargeChange != innerBounds.Width && innerBounds.Width > 0)
_HScrollBar.LargeChange = innerBounds.Width;
if (_HScrollBar.Maximum != _AutoScrollMinSize.Width)
_HScrollBar.Maximum = _AutoScrollMinSize.Width;
if (_HScrollBar.Value != -_AutoScrollPosition.X)
_HScrollBar.Value = (Math.Min(_HScrollBar.Maximum, Math.Abs(_AutoScrollPosition.X)));
_HScrollBar.SmallChange = 22;
}
else
RemoveHScrollBar();
RepositionScrollBars();
}