/// <summary>
/// this causes paint for the table scrollbar area after scrollbar disappear while using Windows Themes
/// </summary>
protected void HideVerticalScrollbarAnimationForWindowsThemes()
{
if (NativeWindowCommon.IsThemeActive())
{
NativeScroll.SCROLLINFO sc = ScrollInfo(NativeScroll.SB_VERT); //force table to stop dragging when we hide scrollbar
ScrollEventArgs arg = new ScrollEventArgs(ScrollEventType.EndScroll, sc.nPos, sc.nPos, ScrollOrientation.VerticalScroll);
this.OnScroll(arg);
SuspendLayout();
sc.nPos = 0;
sc.nMin = 0;
//For some reason, we need the following code
// a. While dragging thumb: As in case of Defect #115454. After the scrollbar is displayed, try dragging the thumbbar upwards.
// It remains visible even after the scrollbar is hidden. The problem is fixed if nMax and nPage are set to 0.
// b. While clicking on the scrollbar just above the thumb so that scroll will be hidden (as in case of defect #115331, RIA task)
// After hiding vertical scrollbar if column width is increased to display horizontal scrollbar and then the thumb on horizontal
// scroll bar is clicked, some area above horizontal scroll bar is grayed. The problem is fixed if nMax and nPage are set to 1.
if (_isThumbDrag)
{
sc.nMax = sc.nPage = 0;
}
else
{
sc.nMax = sc.nPage = 1;
}
sc.fMask = NativeScroll.SIF_ALL;
NativeScroll.SetScrollInfo(this.Handle, NativeScroll.SB_VERT, ref sc, true);
NativeScroll.ShowScrollBar(this.Handle, NativeScroll.SB_VERT, false);
isVerticalScrollBarVisible = false;
ResumeLayout();
NativeWindowCommon.RedrawWindow(this.Handle, IntPtr.Zero, IntPtr.Zero, NativeWindowCommon.RedrawWindowFlags.RDW_FRAME |
NativeWindowCommon.RedrawWindowFlags.RDW_INVALIDATE);
this._header.Refresh();
}
else
{
NativeScroll.ShowScrollBar(this.Handle, NativeScroll.SB_VERT, false);
}
}
/// <summary>
/// Retrun TRUE if Visual Styles for the application are active.
/// </summary>
/// <returns></returns>
public static bool IsXPStylesActive()
{
return(isWinXPOrNewer() && NativeWindowCommon.IsThemeActive());
}
