Constructs a new instance of this class given the event source and
the values to store in its fields.
@param source the ImageLoader that was loading when the event occurred
@param imageData the image data for the event
@param incrementCount the image data increment for the event
@param endOfImage the end of image flag for the event
Constructs a new instance of this class given the event source and the values to store in its fields.
@param source the ImageLoader that was loading when the event occurred @param imageData the image data for the event @param incrementCount the image data increment for the event @param endOfImage the end of image flag for the event