public static IEnumerable <DependencyObject> Descendants(this DependencyObject obj)
{
if (obj is null)
{
throw new ArgumentNullException(nameof(obj));
}
var children = ArrayPool <DependencyObject> .Shared.Rent(obj.MaximumChildrenCount());
try
{
var childrenCount = obj.Children(children);
for (var i = 0; i != childrenCount; ++i)
{
var child = children[i];
yield return(child);
foreach (var grandChild in child.Descendants())
{
yield return(grandChild);
}
}
}
finally
{
ArrayPool <DependencyObject> .Shared.Return(children);
}
}
/// <summary>
/// 特定の型の子要素を取得
/// </summary>
/// <param name="obj">起点となるオブジェクト</param>
/// <returns>子要素</returns>
public static IEnumerable <T> Children <T>(this DependencyObject obj)
where T : DependencyObject
{
if (obj == null)
{
throw new ArgumentNullException(nameof(obj));
}
return(obj.Children().OfType <T>());
}
public static IEnumerable <DependencyObject> Descendants(this DependencyObject obj)
{
if (obj == null)
{
throw new ArgumentNullException();
}
foreach (var child in obj.Children())
{
yield return(child);
foreach (var grandChild in child.Descendants())
{
yield return(grandChild);
}
}
}
private static DependencyObject GetInfoBubble(DependencyObject parent)
{
if (parent.GetType().Name == nameof(InfoBubbleView))
{
return(parent);
}
foreach (var child in parent.Children())
{
var output = GetInfoBubble(child);
if (output != null)
{
return(output);
}
}
return(null);
}
public static IEnumerable <T> ChildrenOfType <T>(this DependencyObject parent)
where T : DependencyObject
{
foreach (var child in parent.Children())
{
var childType = child as T;
if (childType == null)
{
foreach (var ele in ChildrenOfType <T>(child))
{
yield return(ele);
}
}
else
{
yield return(childType);
}
}
}
public static IEnumerable <T> Children <T>(this DependencyObject obj)
where T : DependencyObject
{
return(obj.Children().OfType <T>());
}
/* TODO In GetFocusableControls, assess if it is possible to use Linq and extension
* methods provided by this class:
*
* return dependencyObject.Children<Control>()
* .Where(x => x.IsKeyboardFocusable())
* .OrderBy(x => x.TabIndex);
*
* Steven Volckaert. September 26, 2013.
*/
/// <summary>
/// Returns the DependencyObject's child System.Windows.FrameworkElement by examining the visual tree.
/// </summary>
/// <typeparam name="T">The type of the child element, which must inherit System.Windows.FrameworkElement.</typeparam>
/// <param name="dependencyObject">The DependencyObject instance that this extension method affects.</param>
/// <param name="name">The identifying name of the child FrameworkElement.</param>
/// <returns>The child FrameworkElement, or <c>null</c> if it does not exist.</returns>
public static T Child <T>(this DependencyObject dependencyObject, string name)
where T : FrameworkElement
{
return(dependencyObject.Children <T>().FirstOrDefault(x => x.Name == name));
}
public static IEnumerable <DependencyObject> Descendants(this DependencyObject view)
{
return(view.Children().Flat(Children));
}
