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package org.rosuda.REngine;
/** interface defining delegate methods used by {@link REngine} to forward user interface callbacks from R. */
public interface REngineUIInterface {
/** called when the busy state of R changes - usual response is to change the shape of the cursor
* @param eng calling engine
* @param state busy state of R (0 = not busy)
*/
public void RBusyState (REngine eng, int state);
/** called when R wants the user to choose a file.
* @param eng calling engine
* @param newFile if <code>true</code> then the user can specify a non-existing file to be created, otherwise an existing file must be selected.
* @return full path and name of the selected file or <code>null</code> if the selection was cancelled.
*/
public String RChooseFile (REngine eng, boolean newFile);
}
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