how can I Check PointerCaptured or not?

Question

I have a Canvas within which i am trying to draw a rectangle on pointer move ment.

How can i know weater pointercaptured or not??

crrentle i am using this:

OnPointerDown(Object sender, PointerEventArgs e)

{

Canvas canvas = sender as Canvas;

 canvas.CapturePointer(e.Pointer);

}

OnpointerMove(Object sender, PointerEventArgs e)

{

if ( ?????) // what here

{

//keep drawing rectangle

}

}

OnPointerUp(Object sender, PointerEventArgs e)   {

Canvas canvas = sender as Canvas;

 canvas.ReleasePointerCaptures();

}

Thanks in advance

Answer 1

UIElement exposes a PointerCaptures property. Will that do what you need?

---

Rebecca M. Riordan

Answer 2

As Rebecca suggests you could check UIElement.PointerCaptures to see if the pointer being moved is captured.

I usually set a flag in OnPointerDown to indicate which pointers were in the drawing state and then clear the flag in OnPointerUp or OnPointerCaptureLost. This lets me store more information about what each pointer is doing than just knowing if it is captured.

Don't forget to handle multiple pointers.

--Rob