public static PageObject PrevPageObject(this ChapterObject value, PageObject page_object) { Int32 index = value.IndexOfPageObject(page_object) - 1; if (index < 0) { return(null); } return(value.Pages[index]); }
public static PageObject NextPageObject(this ChapterObject value, PageObject page_object) { Int32 index = value.IndexOfPageObject(page_object) + 1; if (index >= value.Pages.Count) { return(null); } return(value.Pages[index]); }