/// <summary>
/// initialize horizontal scroll
/// </summary>
private void initHScroll()
{
NativeScroll.SCROLLINFO sc = ScrollInfo(NativeScroll.SB_HORZ);
sc.nMax = sc.nMin = sc.nPos = 0;
sc.nPage = 0;
sc.fMask = NativeScroll.SIF_RANGE | NativeScroll.SIF_POS | NativeScroll.SIF_PAGE;
NativeScroll.SetScrollInfo(this.Handle, NativeScroll.SB_HORZ, ref sc, false);
}
/// <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>
/// update horizontal scrollbar
/// </summary>
protected virtual void updateHScroll()
{
if (HorizontalScrollBar)
{
int logWidth = getLogWidth();
int curWidth = ClientSize.Width;
int Xcorner = getXCorner();
SuspendLayout();
//should be scrollbar
if (logWidth > curWidth)
{
int maxRange = logWidth - curWidth;
if (Xcorner > maxRange)
{
ScrollHorizontally(Xcorner, maxRange);
}
NativeScroll.SCROLLINFO sc = ScrollInfo(NativeScroll.SB_HORZ);
sc.nMax = logWidth;
sc.nPage = curWidth;
sc.fMask = NativeScroll.SIF_PAGE | NativeScroll.SIF_RANGE;
NativeScroll.SetScrollInfo(this.Handle, NativeScroll.SB_HORZ, ref sc, false);
if (rightToLeftLayout)
{
int prevPos = 0, newPos;
prevPos = sc.nMax - sc.nPos;
newPos = sc.nMax - prevPos;
if (newPos != sc.nPos)
{
ScrollHorizontally(sc.nPos, newPos);
}
}
if (!isHorizontalScrollBarVisible)
{
NativeScroll.ShowScrollBar(this.Handle, NativeScroll.SB_HORZ, true);
isHorizontalScrollBarVisible = true;
}
}
//no scrollbar
else // if (logWidth <= curWidth)
{
if (_prevLogWidth > _prevWidth)
{
ScrollHorizontally(Xcorner, 0);
}
//It seems that horizontal scrollbar is shown by default on displaying vertical scroll.
// May be even the otherway is true and hence there is a need to refresh vertical scrollbar's visibility in following code
// Anyway, hide it unconditionally. This fixes the issue of black area in table control
//if (isHorizontalScrollBarVisible)
{
NativeScroll.ShowScrollBar(this.Handle, NativeScroll.SB_HORZ, false);
NativeScroll.ShowScrollBar(this.Handle, NativeScroll.SB_VERT, isVscrollShown());
isHorizontalScrollBarVisible = false;
}
}
if ((_prevLogWidth > _prevWidth && logWidth <= curWidth) ||
(_prevLogWidth <= _prevWidth && logWidth > curWidth))
{
if (HorizontalScrollVisibilityChanged != null)
{
HorizontalScrollVisibilityChanged(this, new EventArgs());
}
}
_prevLogWidth = logWidth;
_prevWidth = curWidth;
_displayWidth = Math.Max(logWidth, curWidth);
ResumeLayout();
}
else
{
// We need to update the display width even when there is no scrollbar so as to get correct cordinate in case of Rtl
UpdateDisplayWidth();
}
}
/// <summary>
/// Update vertical scroll bar
/// </summary>
/// <param name="calculateRowsInPage">Calculate rows in page before updating scroll bar</param>
protected override void updateVScroll(bool calculateRowsInPage)
{
bool visibleChanged = false;
bool hScrollBarExisted;
bool hScrollBarExists;
if (SuspendPaint)
{
return;
}
if (calculateRowsInPage)
{
ComputeAndSetRowsInPage(false);
}
hScrollBarExisted = isHscrollShown();
if (isVscrollShown())
{
if (isVerticalScrollBarVisible != isVscrollShown())
{
// In case of thumb drag window is already locked, no need to lock again
if (RightToLeft == RightToLeft.Yes && !_isThumbDrag)
{
NativeWindowCommon.LockWindowUpdate(this.Handle);
}
NativeScroll.ShowScrollBar(this.Handle, NativeScroll.SB_VERT, true);
if (RightToLeft == RightToLeft.Yes && !_isThumbDrag)
{
NativeWindowCommon.LockWindowUpdate(IntPtr.Zero);
}
visibleChanged = true;
}
// Unlock window and update
if (UnlockWindowDrawOnThumbDrag())
{
this.Update();
}
NativeScroll.SCROLLINFO sc = ScrollInfo(NativeScroll.SB_VERT);
sc.nPos = _vScrollThumbPos;
sc.nMax = _virtualItemsCount;
sc.nPage = PageSize;
sc.fMask = NativeScroll.SIF_PAGE | NativeScroll.SIF_RANGE | NativeScroll.SIF_POS;
NativeScroll.SetScrollInfo(this.Handle, NativeScroll.SB_VERT, ref sc, true);
// lock drawing on the window
LockWindowDrawOnThumbDrag();
}
else
{
// If the scrollbar was shown earlier (isVerticalScrollBarVisible is true) and is to be removed
// now (isVscrollShown() is false)...
if (isVerticalScrollBarVisible)
{
if (RightToLeft == RightToLeft.Yes && !_isThumbDrag)
{
NativeWindowCommon.LockWindowUpdate(this.Handle);
}
// Also, handle scrollbar animation caused due to bug in Windows theme
HideVerticalScrollbarAnimationForWindowsThemes();
if (RightToLeft == RightToLeft.Yes && !_isThumbDrag)
{
NativeWindowCommon.LockWindowUpdate(IntPtr.Zero);
}
//...end thumb drag.
if (_isThumbDrag)
{
EndThumbDrag();
}
visibleChanged = true;
}
}
hScrollBarExists = isHscrollShown();
if (visibleChanged)
{
OnVScrollBarVisibleChanged(isVscrollShown(), hScrollBarExisted, hScrollBarExists);
}
isVerticalScrollBarVisible = isVscrollShown();
}
/// <summary>
/// update vertical scroll bar
/// </summary>
protected override void updateVScroll(bool calculateRowsInPage)
{
bool visibleChanged = false;
bool hScrollBarExisted;
bool hScrollBarExists;
if (calculateRowsInPage)
{
ComputeAndSetRowsInPage(false);
}
hScrollBarExisted = isHscrollShown();
if (isVscrollShown())
{
if (isVerticalScrollBarVisible != isVscrollShown())
{
NativeScroll.ShowScrollBar(this.Handle, NativeScroll.SB_VERT, true);
isVerticalScrollBarVisible = true;
visibleChanged = true;
}
NativeScroll.SCROLLINFO sc = ScrollInfo(NativeScroll.SB_VERT);
if (this.DesignMode)
{
if (sc.nMax != 1)
{
sc.nMax = 1;
NativeScroll.SetScrollInfo(this.Handle, NativeScroll.SB_VERT, ref sc, true);
}
}
else if ((_virtualItemsCount != 0 && sc.nMax != _virtualItemsCount - 1) ||
(RowsInPage != 0 && sc.nPage != RowsInPage))
{
sc.nMax = _virtualItemsCount - 1;
sc.nPage = RowsInPage;
sc.nPos = _topIndex + RecordsBeforeCurrentView;
sc.fMask = NativeScroll.SIF_PAGE | NativeScroll.SIF_RANGE | NativeScroll.SIF_POS;
NativeScroll.SetScrollInfo(this.Handle, NativeScroll.SB_VERT, ref sc, true);
}
}
else
{
// If the scrollbar was shown earlier (isVerticalScrollBarVisible is true) and is to be removed
// now (isVscrollShown() is false), handle scrollbar animation caused due to bug in Windows theme
if (isVerticalScrollBarVisible)
{
HideVerticalScrollbarAnimationForWindowsThemes();
visibleChanged = true;
}
}
hScrollBarExists = isHscrollShown();
if (visibleChanged)
{
OnVScrollBarVisibleChanged(isVscrollShown(), hScrollBarExisted, hScrollBarExists);
}
}