Invoked when the dragged image exits the destination’s bounds rectangle (in the case of a view object) or its frame rectangle (in the case of a window object).
The object sending the message; use it to get details about the dragging operation.
Managing a Dragging Session Before an Image Is Released
Invoked when the dragged image enters destination bounds or frame; delegate returns dragging operation to perform.
Invoked periodically as the image is held within the destination area, allowing modification of the dragging operation or mouse-pointer position.