ClassElementTreeHelper
Exposes helper methods for searching and traversing visual trees.
Definition
Namespace:Telerik.Core
Assembly:Telerik.WinUI.Controls.dll
Syntax:
public static class ElementTreeHelperInheritance: objectElementTreeHelper
Methods
EnumVisualDescendants(DependencyObject, Predicate<DependencyObject>, TreeTraversalMode)
Returns a lazily evaluated iterator that allows linear iteration over a tree of DependencyObjects.
Declaration
public static IEnumerable<DependencyObject> EnumVisualDescendants(DependencyObject parent, Predicate<DependencyObject> condition = null, TreeTraversalMode mode = TreeTraversalMode.BreadthFirst)Parameters
parent
DependencyObject
The root element of the tree to iterate over.
condition
Predicate<DependencyObject>
A predicate to filter what elements are returned.
mode
The tree traversal mode of the iteration algorithm.
Returns
IEnumerable<DependencyObject>
A lazily evaluated iterator that allows linear iteration over a tree of DependencyObjects.
FindLastVisualAncestor<T>(DependencyObject, Predicate<DependencyObject>)
Finds the last visual ancestor of the provided type.
Declaration
public static T FindLastVisualAncestor<T>(DependencyObject child, Predicate<DependencyObject> condition = null) where T : classParameters
child
DependencyObject
The from which to start the search.
condition
Predicate<DependencyObject>
A condition to test each ancestor of the T type.
Returns
T
The last ancestor of the specified T type which matches the condition.
FindVisualAncestor<T>(DependencyObject, Predicate<DependencyObject>)
Finds a visual ancestor from a given type and based on a given condition that is in the parent chain of a given child element.
Declaration
public static T FindVisualAncestor<T>(DependencyObject child, Predicate<DependencyObject> condition = null) where T : classParameters
child
DependencyObject
The child.
condition
Predicate<DependencyObject>
The condition.
Returns
T
An instance of the given type if found, otherwise null.
FindVisualDescendant<T>(DependencyObject, Predicate<DependencyObject>)
Finds a visual descendant from a given type and based on a given condition that is in the hierarchy of a given parent element.
Declaration
public static T FindVisualDescendant<T>(DependencyObject parent, Predicate<DependencyObject> condition = null) where T : classParameters
parent
DependencyObject
The parent.
condition
Predicate<DependencyObject>
The condition.
Returns
T
An instance of the given type if found, otherwise null.
IsElementRendered(FrameworkElement)
Determines whether the specified element is rendered on the visual tree.
Declaration
public static bool IsElementRendered(FrameworkElement element)Parameters
element
FrameworkElement
Returns
IsParentChainHitTestVisible(UIElement)
Determines whether all the ancestors of the specified UIElement instance are hit-test visible.
Declaration
public static bool IsParentChainHitTestVisible(UIElement element)Parameters
element
UIElement
The element to start from.
Returns
True if all the ancestors are hit-test visible, false otherwise.
SafeTransformBounds(FrameworkElement, FrameworkElement, Rect)
Transforms the specified rect using the TransformToVisual routine while checking for valid transform conditions - e.g. elements are both loaded and rendered.
Declaration
public static Rect SafeTransformBounds(FrameworkElement from, FrameworkElement to, Rect bounds)Parameters
from
FrameworkElement
From.
to
FrameworkElement
To.
bounds
Rect
The bounds.
Returns
Rect
SafeTransformPoint(FrameworkElement, FrameworkElement, Point)
Transforms the specified point using the TransformToVisual routine while checking for valid transform conditions - e.g. elements are both loaded and rendered.
Declaration
public static Point SafeTransformPoint(FrameworkElement from, FrameworkElement to, Point point)Parameters
from
FrameworkElement
From.
to
FrameworkElement
To.
point
Point
The transform point.
Returns
Point
TransformRectForFlowDirection(Rect, FlowDirection)
Transforms a rectangle according to the provided float direction. Since a struct has its origin always at the top left point, to make a usable in a RightToLeft scenario we need to offset its X coordinate with its width.
Declaration
public static Rect TransformRectForFlowDirection(Rect source, FlowDirection direction)Parameters
source
Rect
The source rectangle to transform.
direction
FlowDirection
The flow direction to transform against.
Returns
Rect
The transformed rectangle.