content: // ===============================================================================
  // Authors: AFRL/RQQD
  // Organization: Air Force Research Laboratory, Aerospace Systems Directorate, Power and Control Division
  // 
  // Copyright (c) 2017 Government of the United State of America, as represented by
  // the Secretary of the Air Force.  No copyright is claimed in the United States under
  // Title 17, U.S. Code.  All Other Rights Reserved.
  // ===============================================================================
  
  /*
   * 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);
          }
      }
  }
  