protected override Vector3 ArrangeOverride(Vector3 finalSizeWithoutMargins)
{
// calculate the remaining space for the child after having removed the padding space.
ViewPort = finalSizeWithoutMargins;
// arrange the content
if (VisualContent != null)
{
// calculate the final size given to the child (scroll view virtual size)
var childSizeWithoutPadding = CalculateSizeWithoutThickness(ref finalSizeWithoutMargins, ref padding);
foreach (var index in ScrollModeToDirectionIndices[ScrollMode])
{
if (ContentAsScrollInfo == null || !ContentAsScrollInfo.CanScroll((Orientation)index))
{
childSizeWithoutPadding[index] = Math.Max(VisualContent.DesiredSizeWithMargins[index], childSizeWithoutPadding[index]);
}
}
// arrange the child
VisualContent.Arrange(childSizeWithoutPadding, IsCollapsed);
// update the scrolling bars
UpdateScrollingBarsSize();
// update the scrolling
if (scrollingRequests.Count > 0)
{
// perform the scrolling requests
foreach (var request in scrollingRequests)
{
var scrollPosition = request.IsRelative ? ScrollOffsets - request.ScrollValue : -request.ScrollValue;
UpdateScrollOffsets(scrollPosition);
}
}
else
{
UpdateScrollOffsets(ScrollOffsets); // insures that scrolling is not out of bounds
}
// update the position of the child
UpdateVisualContentArrangeMatrix();
}
scrollingRequests.Clear();
return(finalSizeWithoutMargins);
}
protected override Vector3 ArrangeOverride(Vector3 finalSizeWithoutMargins)
{
// arrange the content
if (VisualContent != null)
{
// calculate the remaining space for the child after having removed the padding and border space.
var availableLessBorders = CalculateSizeWithoutThickness(ref finalSizeWithoutMargins, ref borderThickness);
var childSizeWithoutPadding = CalculateSizeWithoutThickness(ref availableLessBorders, ref padding);
// arrange the child
VisualContent.Arrange(childSizeWithoutPadding, IsCollapsed);
// compute the rendering offsets of the child element wrt the parent origin (0,0,0)
var childOffsets = new Vector3(padding.Left + borderThickness.Left, padding.Top + borderThickness.Top, padding.Front + borderThickness.Front) - finalSizeWithoutMargins / 2;
// set the arrange matrix of the child.
VisualContent.DependencyProperties.Set(ContentArrangeMatrixPropertyKey, Matrix.Translation(childOffsets));
}
return(finalSizeWithoutMargins);
}
