/// <summary>
/// Sets if the navigation file must be present as a chapter.
/// </summary>
/// <param name="position"></param>
public void SetNavigation(NavigationPosition position)
{
//Finds the navigation ID in the manifest
string navId = (string)manifest
.Elements(opfNamespace + "item")
.FirstOrDefault(x => x.HasAttributes && (string)x.Attribute("properties") == "nav")
?.Attribute("id");
//The navigation must exists, otherwise throw exception
if (navId == null)
{
throw new Exception("Could not find the navigation file in the manifest");
}
//Removes the navigation from the spine
spine
.Elements(opfNamespace + "itemref")
.FirstOrDefault(x => x.HasAttributes && (string)x.Attribute("idref") == navId)
?.Remove();
//If the navigation is set as FirstChapter, adds it to the spine
if (position == NavigationPosition.FirstChapter)
{
spine.AddFirst(
new XElement(opfNamespace + "itemref",
new XAttribute("idref", navId)
)
);
}
}
public NavigationAttribute(string title, string url, int order, string iconClass, NavigationPosition position)
{
Title = title;
Position = position;
IconClass = iconClass;
Order = order;
Url = url;
}
public static IEnumerable <NavigationItem> GetItems(Assembly asm, NavigationPosition position)
{
var items = from n in GetItems(asm)
let attr = n.Attributes.FirstOrDefault(a => a.Position == position)
where n.Attributes.Any(a => a.Position == position)
select new NavigationItem
{
Title = attr.Title,
IconClass = attr.IconClass,
Url = attr.Url,
Order = attr.Order
};
return(items.OrderBy(i => i.Order).ThenBy(i => i.Title).ToArray());
}
/// <summary>
/// Event handler to handle navigation event.
/// </summary>
/// <param name="sender">Sender of event.</param>
/// <param name="eventargs">Event arguments</param>
private void OnNavigationEvent(object sender, NavigationEventArgs eventargs)
{
NavigationPosition navigationPosition = eventargs.NavigationPosition;
bool enabledState = navigationPosition != NavigationPosition.None;
_backButton.Enabled = enabledState;
_nextButton.Enabled = enabledState;
if (navigationPosition == NavigationPosition.First)
{
_backButton.Enabled = false;
}
if (navigationPosition == NavigationPosition.Last)
{
_nextButton.Enabled = false;
}
}
/// <summary>
/// Gets current navigation poistion.
/// </summary>
/// <returns>Navigation position</returns>
private NavigationPosition GetNavigationPosition()
{
NavigationPosition position = NavigationPosition.None;
if (_nodes.Count > 1)
{
if (_nodeIndex == 0)
{
position = NavigationPosition.First;
}
else if (_nodeIndex == _nodes.Count - 1)
{
position = NavigationPosition.Last;
}
else
{
position = NavigationPosition.Middle;
}
}
return(position);
}
/// <summary>
/// Constructor to create instance of
/// </summary>
/// <param name="navigationPosition">Navigation position</param>
public NavigationEventArgs(NavigationPosition navigationPosition)
{
_navigationPosition = navigationPosition;
}
/// <summary>
/// Constructor to create instance of
/// </summary>
/// <param name="navigationPosition">Navigation position</param>
public NavigationEventArgs(NavigationPosition navigationPosition)
{
_navigationPosition = navigationPosition;
}
