package textbender.o.awt; // Copyright 2005, Michael Allan.  Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Textbender Software"), to deal in the Textbender Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicence, and/or sell copies of the Textbender Software, and to permit persons to whom the Textbender Software is furnished to do so, subject to the following conditions: The preceding copyright notice and this permission notice shall be included in all copies or substantial portions of the Textbender Software. THE TEXTBENDER SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE TEXTBENDER SOFTWARE OR THE USE OR OTHER DEALINGS IN THE TEXTBENDER SOFTWARE.

import java.awt.*;
import java.awt.event.*;


/** Adjustable utilities.
  */
public final class AdjustableX
{

    private AdjustableX() {}



    /** Will re-adjust to minimum, following the next adjustment.
      * <p>
      *     For example: use as a workaround to prevent a viewport from tracking the bottom
      *     of its view, as JScrollPane sometimes does when its view changes size.
      *     That is hard to correct, because the adjustment may occur later, after the size change.
      *     To catch and correct it, simply call this on the vertical scroll bar.
      *     </p>
      */
    public static void bounceNextAdjustmentToMinimum( Adjustable adjustable )
    {
        adjustable.addAdjustmentListener( miniBouncer ); // removes itself later
    }


        private static final AdjustmentListener miniBouncer = new AdjustmentListener()
        {
            public void adjustmentValueChanged( AdjustmentEvent e )
            {
                if( e.getValueIsAdjusting() ) return;

                final Adjustable adjustable = e.getAdjustable();
                adjustable.removeAdjustmentListener( miniBouncer ); // one bounce only
                EventQueue.invokeLater( new Runnable()
                {
                    public final void run() { adjustable.setValue( adjustable.getMinimum() ); } // later, after the initial adjustment actually takes effect (or it will clobber this adjustment)
                });
            }
        };



}