/**
* <summary>Moves a page range to a target position within the document.</summary>
* <param name="startIndex">The beginning index, inclusive.</param>
* <param name="endIndex">The ending index, exclusive.</param>
* <param name="targetIndex">The target index.</param>
*/
public void Move(
int startIndex,
int endIndex,
int targetIndex
)
{
int pageCount = pages.Count;
IList <Page> movingPages = pages.GetSlice(startIndex, endIndex);
// Temporarily remove the pages from the pages collection!
/*
* NOTE: Shallow removal (only page references are removed, as their data are kept in the document).
*/
pages.RemoveAll(movingPages);
// Adjust indexes!
pageCount -= movingPages.Count;
if (targetIndex > startIndex)
{
targetIndex -= movingPages.Count;
} // Adjusts the target position due to shifting for temporary page removal.
// Reinsert the pages at the target position!
/*
* NOTE: Shallow addition (only page references are added, as their data are already in the document).
*/
if (targetIndex >= pageCount)
{
pages.AddAll(movingPages);
}
else
{
pages.InsertAll(targetIndex, movingPages);
}
pages.Update(); // NOTE: Update is fundamental to override original page collection.
}