gcc/libjava/javax/swing/border/Border.java

/* Border.java -- 
   Copyright (C) 2003 Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify
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package javax.swing.border;

import java.awt.Component;
import java.awt.Graphics;
import java.awt.Insets;


/**
 * An interface for decorative or spacing borders around a Component.
 *
 * <p>To reduce memory consumption, several Components may share a
 * single Border instance. {@link javax.swing.BorderFactory} is a
 * factory class for producing commonly used shared borders.
 *
 * @see javax.swing.BorderFactory
 * @see EmptyBorder
 * @see CompoundBorder
 * @see BevelBorder
 * @see EtchedBorder
 * @see LineBorder
 * @see MatteBorder
 * @see SoftBevelBorder
 * @see TitledBorder
 * @see AbstractBorder
 *
 * @author Ronald Veldema (rveldema@cs.vu.nl)
 * @author Michael Koch (konqueror@gmx.de)
 * @author Sascha Brawer (brawer@dandelis.ch)
 */
public interface Border
{
  /**
   * Paints the border for a given component.
   *
   * @param c the component whose border is to be painted.
   * @param g the graphics for painting.
   * @param x the horizontal position for painting the border.
   * @param y the vertical position for painting the border.
   * @param width the width of the available area for painting the border.
   * @param height the height of the available area for painting the border.
   */
  public void paintBorder(Component c, Graphics g,
                          int x, int y, int width, int height);
  
  
  /**
   * Measures the width of this border.
   *
   * @param c the component whose border is to be measured.
   *
   * @return an Insets object whose <code>left</code>, <code>right</code>,
   *         <code>top</code> and <code>bottom</code> fields indicate the
   *         width of the border at the respective edge.
   */
  public Insets getBorderInsets(Component c);
  
  
  /**
   * Determines whether this border fills every pixel in its area
   * when painting.
   *
   * @return <code>true</code> if the border is fully opaque, or
   *         <code>false</code> if some pixels of the background
   *         can shine through the border.
   */
  public boolean isBorderOpaque();
}