File size: 3,954 Bytes
fab29d7 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 | using System;
using System.Collections.Generic;
namespace VersOne.Epub
{
/// <summary>
/// A single navigation element of the book (typically within the table of contents).
/// Depending on the value of the <see cref="Type" /> property, it can act either as a header or as a navigation link.
/// Unlike <see cref="EpubNavigationItemRef" />, this class contains the <see cref="HtmlContentFile" /> property
/// which (if it's not <c>null</c>) holds the whole content of the file referenced by this navigation element.
/// </summary>
public class EpubNavigationItem
{
/// <summary>
/// Initializes a new instance of the <see cref="EpubNavigationItem" /> class.
/// </summary>
/// <param name="type">The value determining whether this navigation item acts as a header or as a navigation link.</param>
/// <param name="title">The title of the navigation element (which is either the text of the header or the title of the navigation link).</param>
/// <param name="link">The link of the navigation element if it acts as a navigation link or <c>null</c> if it acts as a header.</param>
/// <param name="htmlContentFile">
/// The EPUB content file referenced by the navigation element or <c>null</c> if the value of the <paramref name="link" /> parameter is <c>null</c>.
/// </param>
/// <param name="nestedItems">A list of child navigation elements constituting the nested navigational hierarchy within the navigation element.</param>
/// <exception cref="ArgumentNullException">The <paramref name="title" /> parameter is <c>null</c>.</exception>
public EpubNavigationItem(EpubNavigationItemType type, string title, EpubNavigationItemLink? link, EpubLocalTextContentFile? htmlContentFile, List<EpubNavigationItem>? nestedItems)
{
Type = type;
Title = title ?? throw new ArgumentNullException(nameof(title));
Link = link;
HtmlContentFile = htmlContentFile;
NestedItems = nestedItems ?? new List<EpubNavigationItem>();
}
/// <summary>
/// Gets the value determining whether this navigation item acts as a header or as a navigation link.
/// </summary>
public EpubNavigationItemType Type { get; }
/// <summary>
/// Gets the title of the navigation element (which is either the text of the header or the title of the navigation link).
/// </summary>
public string Title { get; }
/// <summary>
/// Gets the link of the navigation element if it acts as a navigation link or <c>null</c> if it acts as a header.
/// </summary>
public EpubNavigationItemLink? Link { get; }
/// <summary>
/// Gets the EPUB content file referenced by the navigation element or <c>null</c> if the value of the <see cref="Link" /> property is <c>null</c>.
/// </summary>
public EpubLocalTextContentFile? HtmlContentFile { get; }
/// <summary>
/// <para>Gets a list of child navigation elements constituting the nested navigational hierarchy within the navigation element.</para>
/// </summary>
public List<EpubNavigationItem> NestedItems { get; }
/// <summary>
/// Returns a string containing the values of the <see cref="Type" /> and <see cref="Title" /> properties
/// and the number of the elements in the <see cref="NestedItems" /> property for debugging purposes.
/// </summary>
/// <returns>
/// A string containing the values of the <see cref="Type" /> and <see cref="Title" /> properties
/// and the number of the elements in the <see cref="NestedItems" /> property.
/// </returns>
public override string ToString()
{
return $"Type: {Type}, Title: {Title}, NestedItems.Count: {NestedItems.Count}";
}
}
}
|