private void UpdateCanvas(FixedPagePresenter presenter, SinglePageInfo pageInfo, Point scrollOffset, Rect viewport)
{
Canvas.SetLeft(presenter, pageInfo.PositionInView.X - scrollOffset.X);
double offset = pageInfo.PositionInView.Y - scrollOffset.Y;
if (offset > pageInfo.VerticalOffset || (offset > 0 && offset < pageInfo.VerticalOffset))
{
Canvas.SetTop(presenter, pageInfo.VerticalOffset);
return;
}
else if (offset < 0)
{
double totalheight = pageInfo.BottomPositionInView - pageInfo.TopPositionInView;
double heightOutside = -offset;
double heightInside = totalheight - heightOutside;
if (heightInside < viewport.Height)
{
Canvas.SetTop(presenter, viewport.Height - totalheight);
return;
}
}
Canvas.SetTop(presenter, offset);
}
private void UpdateCanvas(FixedPagePresenter presenter, SinglePageInfo pageInfo, Point scrollOffset, Rect viewport)
{
Canvas.SetLeft(presenter, pageInfo.PositionInView.X - scrollOffset.X);
double offset = pageInfo.PositionInView.Y - scrollOffset.Y;
if (offset > pageInfo.VerticalOffset || (offset > 0 && offset < pageInfo.VerticalOffset))
{
Canvas.SetTop(presenter, pageInfo.VerticalOffset);
return;
}
else if (offset < 0)
{
double totalheight = pageInfo.BottomPositionInView - pageInfo.TopPositionInView;
double heightOutside = -offset;
double heightInside = totalheight - heightOutside;
if (heightInside < viewport.Height)
{
Canvas.SetTop(presenter, viewport.Height - totalheight);
return;
}
}
Canvas.SetTop(presenter, offset);
}
