/// <summary>
/// Adds a page to the list describing the order of pages in the document.
/// </summary>
/// <param name="page">The page to add.</param>
/// <param name="after">The page to add <paramref name="page"/> after, or <c>null</c> to add
/// the page to the end of the order.</param>
public void AddPageToPageOrder(Page page, Page after = null)
{
if (PageOrder.IndexOf(page) == -1)
{
int insertIndex = after == null ? PageOrder.Count : PageOrder.IndexOf(after);
PageOrder.Insert(insertIndex, page);
}
else
{
throw new Exception("Page must not already be in the page order.");
}
}
/// <summary>
/// Swaps the order of two pages in the list describing the order of pages in the document.
/// </summary>
/// <param name="page1">The pages to swap.</param>
/// <param name="page2">The pages to swap.</param>
public void SwapPages(Page page1, Page page2)
{
int page1Index = PageOrder.IndexOf(page1),
page2Index = PageOrder.IndexOf(page2);
if (page1Index == -1 || page2Index == -1)
{
throw new Exception("Both pages must be in the page order.");
}
else
{
PageOrder.RemoveAt(page1Index);
PageOrder.Insert(page1Index, page2);
PageOrder.RemoveAt(page2Index);
PageOrder.Insert(page2Index, page1);
}
}