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how to know when a drop cursor is on top of an element ?

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Dear all,

I have a first list box which contains images (Blue square below). Then I have at the botton a set of pictures within there own canvas ( orange box).

 

What I need to do it to drag an image from the list box onto one of the picture box in orange. When the drag cusror is over the orange image container, I need to change the color of the border and when the drop is realease I need to do some operation at the drop position.

How do I know when my drop curos is over one of the orange container ?

regards

serge


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