internal override bool PositionBottomRealizedItem(ref double visibleItemsBottom)
{
RadVirtualizingDataControlItem lastRealizedItem = this.owner.lastItemCache;
double itemLength = this.GetItemLength(lastRealizedItem);
WrapRow lastWrapRow = null;
int wrapRowsCount = this.wrapRows.Count;
if (wrapRowsCount > 0)
{
lastWrapRow = this.wrapRows[wrapRowsCount - 1];
}
bool isEnoughSpaceForItemInRow = true;
if (lastWrapRow != null)
{
isEnoughSpaceForItemInRow = this.CheckEnoughSpaceForItemInRow(lastWrapRow, lastRealizedItem, true);
}
if (lastWrapRow == null || !isEnoughSpaceForItemInRow)
{
if (!isEnoughSpaceForItemInRow)
{
visibleItemsBottom += lastWrapRow.rowLength;
this.OnRowFilled(lastWrapRow, true);
if (!this.CanRealizeBottom(visibleItemsBottom))
{
return(false);
}
}
lastWrapRow = this.InsertWrapRowAt(wrapRowsCount);
lastWrapRow.firstItem = lastRealizedItem;
lastWrapRow.rowOffset = lastWrapRow.previous != null ? lastWrapRow.previous.rowOffset + lastWrapRow.previous.rowLength : 0;
lastWrapRow.rowLength = itemLength;
}
double currentRowLength = lastWrapRow.rowLength;
switch (this.orientationCache)
{
case Orientation.Horizontal:
if (currentRowLength < lastRealizedItem.height)
{
lastWrapRow.rowLength = lastRealizedItem.height;
visibleItemsBottom += lastRealizedItem.height - currentRowLength;
}
lastRealizedItem.SetVerticalOffset(lastWrapRow.rowOffset);
if (lastWrapRow.lastItem == null)
{
lastRealizedItem.SetHorizontalOffset(0);
}
else
{
lastRealizedItem.SetHorizontalOffset(lastWrapRow.lastItem.horizontalOffsetCache + lastWrapRow.lastItem.width);
}
break;
case Orientation.Vertical:
if (currentRowLength < lastRealizedItem.width)
{
lastWrapRow.rowLength = lastRealizedItem.width;
visibleItemsBottom += lastRealizedItem.width - currentRowLength;
}
lastRealizedItem.SetHorizontalOffset(lastWrapRow.rowOffset);
if (lastWrapRow.lastItem == null)
{
lastRealizedItem.SetVerticalOffset(0);
}
else
{
lastRealizedItem.SetVerticalOffset(lastWrapRow.lastItem.verticalOffsetCache + lastWrapRow.lastItem.height);
}
break;
}
lastWrapRow.lastItem = lastRealizedItem;
lastRealizedItem.wrapRow = lastWrapRow;
if (this.owner.IsLastItemLastInListSource())
{
this.OnRowFilled(lastWrapRow, true);
}
return(true);
}
internal override void OnContainerSizeChanged(RadVirtualizingDataControlItem container, Size newSize, Size oldSize)
{
if (!this.topRealized.Contains(container))
{
RadVirtualizingDataControlItem pivotContainer = container.next;
int containersToSkip = 0;
if (pivotContainer != null)
{
containersToSkip = Math.Max(this.stackCount - this.owner.realizedItems.IndexOf(pivotContainer), 0);
}
while (pivotContainer != null)
{
if (containersToSkip > 0)
{
containersToSkip--;
continue;
}
this.slotsRepository.Remove(pivotContainer.associatedDataItem.GetHashCode());
pivotContainer = pivotContainer.next;
}
this.ReorderViewportOnItemsChanged();
}
else
{
double newOffset = 0;
double offsetDelta = 0;
switch (this.orientationCache)
{
case Orientation.Horizontal:
offsetDelta = newSize.Height - oldSize.Height;
newOffset = container.verticalOffsetCache - offsetDelta;
container.SetVerticalOffset(newOffset);
double horizontalOffset = container.horizontalOffsetCache;
while (container.previous != null)
{
container = container.previous;
if (container.horizontalOffsetCache == horizontalOffset)
{
container.SetVerticalOffset(container.verticalOffsetCache - offsetDelta);
}
}
break;
case Orientation.Vertical:
offsetDelta = newSize.Width - oldSize.Width;
newOffset = container.horizontalOffsetCache - offsetDelta;
container.SetHorizontalOffset(newOffset);
double verticalOffset = container.verticalOffsetCache;
while (container.previous != null)
{
container = container.previous;
if (container.verticalOffsetCache == verticalOffset)
{
container.SetHorizontalOffset(container.horizontalOffsetCache - offsetDelta);
}
}
break;
}
}
}
