/// <summary>
/// Scrolls the line into viewable area.
/// </summary>
/// <param name="lineIndex">Index of the line.</param>
/// <param name="lineSize">Size of the line.</param>
public override void ScrollInView(int lineIndex, double lineSize)
{
VisibleLinesCollection lines = GetVisibleLines();
VisibleLineInfo line = lines.GetVisibleLineAtLineIndex(lineIndex);
double delta = 0;
if (line != null)
{
if (!line.IsClipped || line.IsFooter || line.IsHeader)
{
return;
}
if (line.IsClippedOrigin && !line.IsClippedCorner)
{
delta = -(lineSize - line.ClippedSize);
}
else if (!line.IsClippedOrigin && line.IsClippedCorner)
{
//Following code prevent the horizontal auto scrolling when column size is bigger than viewPort size.
if (line.ClippedOrigin < line.ClippedSize)
{
delta = 0;
}
else
{
delta = lineSize - line.ClippedSize;
}
}
else
{
delta = lineSize - line.ClippedSize;
}
}
else
{
double d = Distances.GetCumulatedDistanceAt(lineIndex);
if (d > ScrollBar.Value)
{
d = d + lineSize - ScrollBar.LargeChange;
}
delta = d - ScrollBar.Value;
}
if (delta != 0)
{
ScrollBar.Value += delta;
}
}
/// <summary>
/// Scrolls the line into viewable area.
/// </summary>
/// <param name="lineIndex">Index of the line.</param>
/// <param name="lineSize"></param>
public override void ScrollInView(int lineIndex, double lineSize)
{
VisibleLinesCollection lines = GetVisibleLines();
VisibleLineInfo line = lines.GetVisibleLineAtLineIndex(lineIndex);
double delta = 0;
if (line != null)
{
if (!line.IsClipped || line.IsFooter || line.IsHeader)
{
return;
}
if (line.IsClippedOrigin && !line.IsClippedCorner)
{
delta = -1;
}
else if (!line.IsClippedOrigin && line.IsClippedCorner)
{
double y = line.Size - line.ClippedSize;
int scrollIndex = this.ScrollLineIndex;
double visibleScrollIndex = ScrollBar.Value;
while (y > 0 && visibleScrollIndex < ScrollBar.Maximum)
{
delta++;
visibleScrollIndex++;
y -= GetLineSize(ScrollBarValueToLineIndex(visibleScrollIndex));
}
}
}
else
{
double visibleScrollIndex = LineIndexToScrollBarValue(lineIndex);
if (visibleScrollIndex > ScrollBar.Value)
{
int scrollIndexLinex = this.IntPreviousPageLineIndex(ScrollPageSize - GetLineSize(lineIndex), lineIndex);
visibleScrollIndex = LineIndexToScrollBarValue(scrollIndexLinex);
}
delta = visibleScrollIndex - ScrollBar.Value;
}
if (delta != 0)
{
ScrollBar.Value += delta;
}
base.ScrollInView(lineIndex, lineSize);
}
/// <summary>
/// Gets the cumulated corner taking scroll position into account. The
/// returned value is between ScrollBar.Minimum and ScrollBar.Maximum.
/// </summary>
/// <param name="line">The line.</param>
/// <returns></returns>
private double GetCumulatedCorner(VisibleLineInfo line)
{
VisibleLinesCollection lines = GetVisibleLines();
if (line.IsHeader)
{
return(line.Corner);
}
else if (line.IsFooter)
{
return(ScrollBar.Maximum - lines[lines.firstFooterVisibleIndex].Origin + line.Corner);
}
return(line.Corner - ScrollBar.Minimum + ScrollBar.Value);
}
/// <summary>
/// Returns the first and last point for the given lines in a region.
/// </summary>
/// <param name="region">The region.</param>
/// <param name="first">The index of the first line.</param>
/// <param name="last">The index of the last line.</param>
/// <param name="allowEstimatesForOutOfViewLines">if set to <c>true</c> allow estimates for out of view lines.</param>
/// <returns></returns>
public override DoubleSpan RangeToPoints(ScrollAxisRegion region, int first, int last, bool allowEstimatesForOutOfViewLines)
{
VisibleLinesCollection lines = GetVisibleLines();
// If line is visible use already calculated values,
// otherwise get value from Distances
VisibleLineInfo line1 = lines.GetVisibleLineAtLineIndex(first);
VisibleLineInfo line2 = lines.GetVisibleLineAtLineIndex(last);
double p1, p2;
p1 = line1 == null?Distances.GetCumulatedDistanceAt(first) : GetCumulatedOrigin(line1);
p2 = line2 == null?Distances.GetCumulatedDistanceAt(last + 1) : GetCumulatedCorner(line2);
return(RangeToPointsHelper(region, p1, p2));
}
private DoubleSpan RangeToPointsHelper(ScrollAxisRegion region, double p1, double p2)
{
VisibleLinesCollection lines = GetVisibleLines();
switch (region)
{
case ScrollAxisRegion.Header:
if (HeaderLineCount > 0)
{
return(new DoubleSpan(p1, p2));
}
else
{
return(DoubleSpan.Empty);
}
case ScrollAxisRegion.Footer:
if (IsFooterVisible)
{
VisibleLineInfo l = lines[lines.FirstFooterVisibleIndex];
double p3 = Distances.TotalDistance - this.FooterExtent;
p1 += l.Origin - p3;
p2 += l.Origin - p3;
return(new DoubleSpan(p1, p2));
}
else
{
return(DoubleSpan.Empty);
}
case ScrollAxisRegion.Body:
p1 += HeaderExtent - ScrollBar.Value;
p2 += HeaderExtent - ScrollBar.Value;
return(new DoubleSpan(p1, p2));
}
return(DoubleSpan.Empty);
}
/// <summary>
/// Returns the first and last point for the given lines in a region.
/// </summary>
/// <param name="region">The region.</param>
/// <param name="first">The index of the first line.</param>
/// <param name="last">The index of the last line.</param>
/// <param name="allowEstimatesForOutOfViewLines">if set to <c>true</c> allow estimates for out of view lines.</param>
/// <returns></returns>
public override DoubleSpan RangeToPoints(ScrollAxisRegion region, int first, int last, bool allowEstimatesForOutOfViewLines)
{
VisibleLinesCollection visibleLines = this.GetVisibleLines();
bool firstVisible, lastVisible;
VisibleLineInfo firstLine, lastLine;
GetLinesAndVisibility(first, last, true, out firstVisible, out lastVisible, out firstLine, out lastLine);
if (firstLine == null || lastLine == null)
{
return(DoubleSpan.Empty);
}
if (allowEstimatesForOutOfViewLines)
{
switch (region)
{
case ScrollAxisRegion.Header:
if (!firstLine.IsHeader)
{
return(DoubleSpan.Empty);
}
break;
case ScrollAxisRegion.Footer:
if (!lastLine.IsFooter)
{
return(DoubleSpan.Empty);
}
break;
case ScrollAxisRegion.Body:
if (firstLine.IsFooter || lastLine.IsHeader)
{
return(DoubleSpan.Empty);
}
break;
} // switch
return(new DoubleSpan(firstLine.Origin, lastLine.Corner));
}
else
{
switch (region)
{
case ScrollAxisRegion.Header:
{
if (!firstLine.IsHeader)
{
return(DoubleSpan.Empty);
}
if (!lastVisible || !lastLine.IsHeader)
{
double corner = firstLine.Corner;
for (int n = firstLine.LineIndex + 1; n <= last; n++)
{
corner += GetLineSize(n);
}
return(new DoubleSpan(firstLine.Origin, corner));
}
return(new DoubleSpan(firstLine.Origin, lastLine.Corner));
}
case ScrollAxisRegion.Footer:
{
if (!lastLine.IsFooter)
{
return(DoubleSpan.Empty);
}
if (!firstVisible || !firstLine.IsFooter)
{
double origin = lastLine.Origin;
for (int n = lastLine.LineIndex - 1; n >= first; n--)
{
origin -= GetLineSize(n);
}
return(new DoubleSpan(origin, lastLine.Corner));
}
return(new DoubleSpan(firstLine.Origin, lastLine.Corner));
}
case ScrollAxisRegion.Body:
{
if (firstLine.IsFooter || lastLine.IsHeader)
{
return(DoubleSpan.Empty);
}
double origin = firstLine.Origin;
if (!firstVisible || firstLine.Region != ScrollAxisRegion.Body)
{
origin = HeaderExtent;
for (int n = ScrollLineIndex - 1; n >= first; n--)
{
origin -= GetLineSize(n);
}
}
double corner = lastLine.Corner;
if (!lastVisible || lastLine.Region != ScrollAxisRegion.Body)
{
corner = LastBodyVisibleLine.Corner;
for (int n = LastBodyVisibleLine.LineIndex + 1; n <= last; n++)
{
corner += GetLineSize(n);
}
}
return(new DoubleSpan(origin, corner));
}
} // switch
return(new DoubleSpan(firstLine.Origin, lastLine.Corner));
}
}
