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using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Markup;
namespace MaterialDesignThemes.Wpf
{
public static class TreeViewAssist
{
/// <summary>
/// Allows additional rendering for each tree node, outside of the rippled part of the node which responsds to user selection.
/// </summary>
/// <remarks>
/// The content to be rendered is the same of the <see cref="TreeViewItem"/>; i.e the Header property, or
/// some other content such as a view model, typically when using a <see cref="HierarchicalDataTemplate"/>.
/// </remarks>
public static readonly DependencyProperty AdditionalTemplateProperty = DependencyProperty.RegisterAttached(
"AdditionalTemplate",
typeof(DataTemplate),
typeof(TreeViewAssist),
new FrameworkPropertyMetadata(null, FrameworkPropertyMetadataOptions.Inherits));
/// <summary>
/// Sets the additional template.
/// </summary>
/// <param name="element">The element.</param>
/// <param name="value">The value.</param>
public static void SetAdditionalTemplate(DependencyObject element, DataTemplate value)
{
element.SetValue(AdditionalTemplateProperty, value);
}
/// <summary>
/// Gets the additional template.
/// </summary>
/// <param name="element">The element.</param>
/// <returns>
/// The <see cref="DataTemplate" />.
/// </returns>
public static DataTemplate GetAdditionalTemplate(DependencyObject element)
{
return (DataTemplate)element.GetValue(AdditionalTemplateProperty);
}
/// <summary>
/// Allows additional rendering for each tree node, outside of the rippled part of the node which responsds to user selection.
/// </summary>
/// <remarks>
/// The content to be rendered is the same of the <see cref="TreeViewItem"/>; i.e the Header property, or
/// some other content such as a view model, typically when using a <see cref="HierarchicalDataTemplate"/>.
/// </remarks>
public static readonly DependencyProperty AdditionalTemplateSelectorProperty = DependencyProperty.RegisterAttached(
"AdditionalTemplateSelector",
typeof(DataTemplateSelector),
typeof(TreeViewAssist),
new FrameworkPropertyMetadata(null, FrameworkPropertyMetadataOptions.Inherits));
/// <summary>
/// Sets the additional template selector.
/// </summary>
/// <param name="element">The element.</param>
/// <param name="value">The value.</param>
public static void SetAdditionalTemplateSelector(DependencyObject element, DataTemplateSelector value)
{
element.SetValue(AdditionalTemplateSelectorProperty, value);
}
/// <summary>
/// Gets the additional template selector.
/// </summary>
/// <param name="element">The element.</param>
/// <returns>
/// The <see cref="DataTemplateSelector" />.
/// </returns>
public static DataTemplateSelector GetAdditionalTemplateSelector(DependencyObject element)
{
return (DataTemplateSelector)element.GetValue(AdditionalTemplateSelectorProperty);
}
private static readonly Lazy<DataTemplate> NoAdditionalTemplateProvider = new Lazy<DataTemplate>(CreateEmptyGridDataTemplate);
/// <summary>
/// To be used at <see cref="TreeViewItem"/> level, or to be returned by <see cref="AdditionalTemplateSelector"/>
/// implementors when the additional template associated with a tree should not be used.
/// </summary>
public static readonly DataTemplate SuppressAdditionalTemplate = NoAdditionalTemplateProvider.Value;
public static DataTemplate CreateEmptyGridDataTemplate()
{
var xaml = "<DataTemplate><Grid /></DataTemplate>";
var parserContext = new ParserContext();
parserContext.XmlnsDictionary.Add("", "http://schemas.microsoft.com/winfx/2006/xaml/presentation");
parserContext.XmlnsDictionary.Add("x", "http://schemas.microsoft.com/winfx/2006/xaml");
using (var memoryStream = new MemoryStream(Encoding.ASCII.GetBytes(xaml)))
{
return (DataTemplate)XamlReader.Load(memoryStream, parserContext);
}
}
}
}
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