private void ScrollToMain(LogicalExtent scrollTo, GridPlacement placement)
{
_scrollToMain = scrollTo;
_scrollToMainPlacement = placement;
SetScrollDeltaMain(0, false);
InvalidateMeasure();
}
private void AdjustScrollToMain(double delta, bool assertRealized)
{
_scrollToMain = Translate(ScrollToMainExtent + delta);
SetScrollDeltaMain(0, false);
CoerceScrollToMain();
if (assertRealized)
{
AssertAdjustedScrollToMain();
}
}
private double Translate(LogicalExtent logicalExtent)
{
var gridExtent = logicalExtent.GridExtent;
if (gridExtent >= MaxGridExtentMain)
{
return(MaxGridExtentMain == 0 ? 0 : GetLogicalMainTrack(MaxGridExtentMain - 1).EndExtent);
}
else
{
var span = GetLogicalMainTrack(gridExtent).ExtentSpan;
return(span.Start + span.Length * logicalExtent.Fraction);
}
}
private void CoerceScrollToMain()
{
var min = MinScrollToMain;
if (_scrollToMain.Value < min.Value)
{
_scrollToMain = min;
}
var max = MaxScrollToMain;
if (_scrollToMain.Value > max.Value)
{
_scrollToMain = max;
}
}
