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using System.Windows;
using System.Windows.Controls;
using VersOne.Epub.WpfDemo.ViewModels;
namespace VersOne.Epub.WpfDemo.Controls
{
/// <summary>
/// A data template selector class that chooses between the <see cref="NavigationHeaderTemplate" /> and <see cref="NavigationItemTemplate" /> templates
/// based on the type of the navigation item.
/// </summary>
public class NavigationTemplateSelector : DataTemplateSelector
{
/// <summary>
/// Gets or sets the data template to render a navigation header.
/// </summary>
public DataTemplate NavigationHeaderTemplate { get; set; }
/// <summary>
/// Gets or sets the data template to render a navigation link.
/// </summary>
public DataTemplate NavigationItemTemplate { get; set; }
/// <summary>
/// Returns the <see cref="NavigationItemTemplate" /> if the <paramref name="item" /> is a navigation link and <see cref="NavigationHeaderTemplate" /> otherwise.
/// </summary>
/// <param name="item">The navigation item for which to select the template.</param>
/// <param name="container">The data-bound object. Not used in this template selector.</param>
/// <returns>The selected data template.</returns>
public override DataTemplate SelectTemplate(object item, DependencyObject container)
{
if (item is NavigationItemViewModel navigationItemViewModel)
{
return navigationItemViewModel.IsLink ? NavigationItemTemplate : NavigationHeaderTemplate;
}
else
{
return null;
}
}
}
}
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