/**
 *  The intelligence behind the AlphaCanvas.
 *  Contract of this component:  Collects chars until it has a monogram,
 *  then asks AlphaCanvas to use that monogram instead.
 *  Waits to be handed chars; imposes new monogram on AlphaCanvas.
 */
public class AlphaSmarts
{
    protected AlphaCanvas canvas;            // The canvas
    private boolean charWaiting = false;     // Have I already got a char?
    private char firstChar;                  // If so, the char.

    /**
     *  Remember the canvas you're being smart for.
     */
    public AlphaSmarts( AlphaCanvas c )
    {
	this.canvas = c;
    }

    /**
     *  What to do when a char comes in.  (Store it or tell Canvas
     *  about new monogram.
     *  @param c the char that came in.
     */
    public synchronized void handleChar( char c )
    {
	if( ! this.charWaiting ){         // remember first char for later
	    this.charWaiting = true;
	    this.firstChar = c;
	} else {                          // two chars makes a monogram
	    this.charWaiting = false;
	    this.record(  new SafeMonogram( this.firstChar, c ) );
	}
    }

    /**
     *  How to tell the canvas it's time to update the monogram.
     */    
    protected void record( SafeMonogram m )
    {
	this.canvas.setText( m );
    }


}