compoundemptyborder.java

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/*
 * Created on Apr 14, 2005
 */
package org.flexdock.plaf.common.border;

import java.awt.Insets;

import javax.swing.border.Border;
import javax.swing.border.CompoundBorder;
import javax.swing.border.EmptyBorder;

/**
 * @author Christopher Butler
 */
public class CompoundEmptyBorder extends CompoundBorder {
	protected static final Insets EMPTY_INSETS = new Insets(0, 0, 0, 0);
	protected boolean inner;
	
	public static CompoundEmptyBorder create(Border border, boolean inner) {
		return create(border, inner, null);
	}
	
	public static CompoundEmptyBorder create(Border border, boolean inner, Insets base) {
		if(base==null)
			base = new Insets(0, 0, 0, 0);
		
		MutableEmptyBorder empty = new MutableEmptyBorder(base.top, base.left, base.bottom, base.right);
		if(inner)
			return new CompoundEmptyBorder(border, empty, inner);
		return new CompoundEmptyBorder(empty, border, inner);
	}
	
	protected CompoundEmptyBorder(Border outer, Border inner, boolean emptyInner) {
		super(outer, inner);
		this.inner = emptyInner;
	}
	
	public boolean setEmptyInsets(Insets insets) {
		if(insets==null)
			insets = EMPTY_INSETS;
		return setEmptyInsets(insets.top, insets.left, insets.bottom, insets.right);
	}
	
	public boolean setEmptyInsets(int top, int left, int bottom, int right) {
		Border border = inner? getInsideBorder(): getOutsideBorder();
		return ((MutableEmptyBorder)border).updateInsets(top, left, bottom, right);
	}
	
	public Insets getEmptyInsets() {
		Border border = inner? getInsideBorder(): getOutsideBorder();
		MutableEmptyBorder empty = (MutableEmptyBorder)border;
		return empty.getInsetsCopy();
	}
	
	public Border getWrappedBorder() {
	    return inner? getOutsideBorder(): getInsideBorder();
	}
	
	protected static class MutableEmptyBorder extends EmptyBorder {
		public MutableEmptyBorder(int top, int left, int bottom, int right) {
			super(top, left, bottom, right);
		}

		public MutableEmptyBorder(Insets borderInsets) {
			super(borderInsets);
		}
		
		private boolean updateInsets(int top, int left, int bottom, int right) {
			boolean changed = this.top!=top || this.left!=left || this.bottom!=bottom || this.right!=right;
			this.top = top;
			this.bottom = bottom;
			this.left = left;
			this.right = right;
			return changed;
		}
		
		private Insets getInsetsCopy() {
			return new Insets(top, left, bottom, right);
		}
	}
}