/// <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));
}
/// <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);
}
