public static interface ILcdGXYViewLabelPlacer.ViewLabelPlacerCallback
ILcdGXYViewLabelPlacer. This callback is used to
report that labels were updated by the view label placer or that the label placing process
was ended. Methods of this callback interface should always be called on the AWT thread.
ILcdGXYViewLabelPlacer has updated the labels. This method is
typically used to signal that intermediate results are available. When this method is
called, it doesn't necessarily mean that label placing has ended (e.g when asynchronous
label placing is used). So it is possible that it is called multiple times before
labelPlacingEnded() is called.
ILcdGXYViewLabelPlacer has finished updating the labels.