Enables a UIElement subclass to expose child elements that assist with resolving touch targeting.
Syntax
protected virtual IEnumerable<IEnumerable> FindSubElementsForTouchTargeting( Point point, Rect boundingRect )
Parameters
- point
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Type: Point
The point being touched.
- boundingRect
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Type: Rect
The bounds used for touch tolerance.
Return value
Type: IIterable<IIterable> [C++] | System.Collections.Generic.IEnumerable<IIterable> [.NET]
A set of point sets. These represent the vertices of sub elements that are intersected by the given touch point (plus tolerance).
Remarks
Points in the list are in descending z-order: topmost in the rendering stack appears first in the list.
FindElementsInHostCoordinates is a similar static-class helper method that is also used for hit testing and general object tree examination. However, FindSubElementsForTouchTargeting adds the refinement of a Rect input to use for touch tolerance.
If you are programming using C# or Microsoft Visual Basic, the return value type of this method is projected as an IEnumerable generic collection that contains UIElement items. If you are programming using Visual C++ component extensions (C++/CX), the return type of this method is IIterable<UIElement>.
Requirements
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Minimum supported client | Windows 8 |
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Minimum supported server | Windows Server 2012 |
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See also
Build date: 1/31/2013
