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MiGLayout - core layout logic
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package net.miginfocom.layout;

/*
 * License (BSD):
 * ==============
 *
 * Copyright (c) 2004, Mikael Grev, MiG InfoCom AB. (miglayout (at) miginfocom (dot) com)
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 * Redistributions of source code must retain the above copyright notice, this list
 * of conditions and the following disclaimer.
 * Redistributions in binary form must reproduce the above copyright notice, this
 * list of conditions and the following disclaimer in the documentation and/or other
 * materials provided with the distribution.
 * Neither the name of the MiG InfoCom AB nor the names of its contributors may be
 * used to endorse or promote products derived from this software without specific
 * prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
 * OF SUCH DAMAGE.
 *
 * @version 1.0
 * @author Mikael Grev, MiG InfoCom AB
 *         Date: 2006-sep-08
 */

/** An interface to implement if you want to decide the gaps between two types of components within the same cell.
 * 
 * E.g.:
 *
 * 
 * {@code
 * if (adjacentComp == null || adjacentSide == SwingConstants.LEFT || adjacentSide == SwingConstants.TOP)
 *	  return null;
 *
 * boolean isHor = (adjacentSide == SwingConstants.LEFT || adjacentSide == SwingConstants.RIGHT);
 *
 * if (adjacentComp.getComponentType(false) == ComponentWrapper.TYPE_LABEL && comp.getComponentType(false) == ComponentWrapper.TYPE_TEXT_FIELD)
 *    return isHor ? UNRELATED_Y : UNRELATED_Y;
 *
 * return (adjacentSide == SwingConstants.LEFT || adjacentSide == SwingConstants.RIGHT) ? RELATED_X : RELATED_Y;
 * }
 * 
 */
public interface InCellGapProvider
{
	/** Returns the default gap between two components that are in the same cell.
	 * @param comp The component that the gap is for. Never null.
	 * @param adjacentComp The adjacent component if any. May be null.
	 * @param adjacentSide What side the adjacentComp is on. {@link javax.swing.SwingUtilities#TOP} or
	 * {@link javax.swing.SwingUtilities#LEFT} or {@link javax.swing.SwingUtilities#BOTTOM} or {@link javax.swing.SwingUtilities#RIGHT}.
	 * @param tag The tag string that the component might be tagged with in the component constraints. May be null.
	 * @param isLTR If it is left-to-right.
	 * @return The default gap between two components or null if there should be no gap.
	 */
	public abstract BoundSize getDefaultGap(ComponentWrapper comp, ComponentWrapper adjacentComp, int adjacentSide, String tag, boolean isLTR);
}