// This Source Code is in the Public Domain per: http://unlicense.org
package org.litesoft.GWT.client.widgets.nonpublic;

public class DragPositionableController extends AbstractMovable
{
    public DragPositionableController( UiPositionable pTarget )
    {
        super( pTarget );
    }

    @Override
    protected boolean dragBy( int pDeltaX, int pDeltaY )
    {
        getTarget().setPosition( calcNewPos( "X", getTarget().getPosLeft(), pDeltaX, //
                                             getTarget().minPosLeft(), getTarget().maxPosLeft() ), calcNewPos( "Y", getTarget().getPosTop(), pDeltaY, //
                                                                                                               getTarget().minPosTop(), getTarget().maxPosTop() ) );
        return true;
    }

    /**
     * @noinspection UnusedDeclaration
     */
    private int calcNewPos( String pOrientation, int pCurrentPosition, int pDelta, int pMinimumPosition, int pMaximumPosition )
    {
        int zNewPosition = pCurrentPosition;
        if ( pDelta < 0 )
        {
            if ( (zNewPosition += pDelta) < pMinimumPosition )
            {
                zNewPosition = pMinimumPosition;
            }
        }
        else if ( (pDelta > 0) && (pMaximumPosition > 0) )
        {
            if ( (zNewPosition += pDelta) > pMaximumPosition )
            {
                zNewPosition = pMaximumPosition;
            }
        }
        return zNewPosition;
    }
}