/// <summary>
/// This will search for a parent of the specified type.
/// </summary>
/// <typeparam name="T">The type of the element to find</typeparam>
/// <param name="startingObject">The node where the search begins.</param>
/// <param name="checkStartingObject">Should the specified startingObject be checked first.</param>
/// <param name="additionalCheck">Provide a callback to check additional properties
/// of the found elements. Can be left Null if no additional criteria are needed.</param>
/// <returns>Returns the found element. Null if nothing is found.</returns>
/// <example>Button button = TreeHelper.FindParent<Button>( this, foundChild => foundChild.Focusable );</example>
public static T FindParent <T>(DependencyObject startingObject, bool checkStartingObject, Func <T, bool> additionalCheck) where T : DependencyObject
{
T foundElement;
DependencyObject parent = (checkStartingObject ? startingObject : TreeHelper.GetParent(startingObject, true));
while (parent != null)
{
foundElement = parent as T;
if (foundElement != null)
{
if (additionalCheck == null)
{
return(foundElement);
}
else
{
if (additionalCheck(foundElement))
{
return(foundElement);
}
}
}
parent = TreeHelper.GetParent(parent, true);
}
return(null);
}
/// <summary>
/// Returns true if the specified element is a child of parent somewhere in the visual
/// tree. This method will work for Visual, FrameworkElement and FrameworkContentElement.
/// </summary>
/// <param name="element">The element that is potentially a child of the specified parent.</param>
/// <param name="parent">The element that is potentially a parent of the specified element.</param>
public static bool IsDescendantOf(DependencyObject element, DependencyObject parent, bool recurseIntoPopup)
{
while (element != null)
{
if (element == parent)
{
return(true);
}
element = TreeHelper.GetParent(element, recurseIntoPopup);
}
return(false);
}
/// <summary>
/// Tries its best to return the specified element's parent. It will
/// try to find, in this order, the VisualParent, LogicalParent, LogicalTemplatedParent.
/// It only works for Visual, FrameworkElement or FrameworkContentElement.
/// </summary>
/// <param name="element">The element to which to return the parent. It will only
/// work if element is a Visual, a FrameworkElement or a FrameworkContentElement.</param>
/// <remarks>If the logical parent is not found (Parent), we check the TemplatedParent
/// (see FrameworkElement.Parent documentation). But, we never actually witnessed
/// this situation.</remarks>
public static DependencyObject GetParent(DependencyObject element)
{
return(TreeHelper.GetParent(element, true));
}