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CompoundBorder.java
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1998-06-30
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/*
* @(#)CompoundBorder.java 1.9 98/02/02
*
* Copyright (c) 1997 Sun Microsystems, Inc. All Rights Reserved.
*
* This software is the confidential and proprietary information of Sun
* Microsystems, Inc. ("Confidential Information"). You shall not
* disclose such Confidential Information and shall use it only in
* accordance with the terms of the license agreement you entered into
* with Sun.
*
* SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF THE
* SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
* IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
* PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR ANY DAMAGES
* SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTING
* THIS SOFTWARE OR ITS DERIVATIVES.
*
*/
package com.sun.java.swing.border;
import java.awt.Graphics;
import java.awt.Insets;
import java.awt.Component;
/**
* A composite Border class used to compose two Border objects
* into a single border by nesting an inside Border object within
* the insets of an outside Border object.
*
* For example, this class may be used to add blank margin space
* to a component with an existing decorative border:
* <p>
* <code><pre>
* Border border = comp.getBorder();
* Border margin = new EmptyBorder(10,10,10,10);
* comp.setBorder(new CompoundBorder(border, margin));
* </pre></code>
* <p>
* Warning: serialized objects of this class will not be compatible with
* future swing releases. The current serialization support is appropriate
* for short term storage or RMI between Swing1.0 applications. It will
* not be possible to load serialized Swing1.0 objects with future releases
* of Swing. The JDK1.2 release of Swing will be the compatibility
* baseline for the serialized form of Swing objects.
*
* @version 1.9 02/02/98
* @author David Kloba
*/
public class CompoundBorder extends AbstractBorder {
protected Border outsideBorder;
protected Border insideBorder;
/**
* Creates a compound border with null outside and inside borders.
*/
public CompoundBorder() {
this.outsideBorder = null;
this.insideBorder = null;
}
/**
* Creates a compound border with the specified outside and
* inside borders. Either border may be null.
* @param outsideBorder the outside border
* @param insideBorder the inside border to be nested
*/
public CompoundBorder(Border outsideBorder, Border insideBorder) {
this.outsideBorder = outsideBorder;
this.insideBorder = insideBorder;
}
/**
* Returns whether or not this compound border is opaque.
* Returns true if both the inside and outside borders are
* non-null and opaque; returns false otherwise.
*/
public boolean isBorderOpaque() {
return (outsideBorder != null && outsideBorder.isBorderOpaque()) &&
(insideBorder != null && insideBorder.isBorderOpaque());
}
/**
* Paints the compound border by painting the outside border
* with the specified position and size and then painting the
* inside border at the specified position and size offset by
* the insets of the outside border.
* @param c the component for which this border is being painted
* @param g the paint graphics
* @param x the x position of the painted border
* @param y the y position of the painted border
* @param width the width of the painted border
* @param height the height of the painted border
*/
public void paintBorder(Component c, Graphics g, int x, int y, int width, int height) {
Insets nextInsets;
int px, py, pw, ph;
px = x;
py = y;
pw = width;
ph = height;
if(outsideBorder != null) {
outsideBorder.paintBorder(c, g, px, py, pw, ph);
nextInsets = outsideBorder.getBorderInsets(c);
px += nextInsets.left;
py += nextInsets.top;
pw = pw - nextInsets.right - nextInsets.left;
ph = ph - nextInsets.bottom - nextInsets.top;
}
if(insideBorder != null)
insideBorder.paintBorder(c, g, px, py, pw, ph);
}
/**
* Returns the insets of the composite border by adding
* the insets of the outside border to the insets of the
* inside border.
* @param c the component for which this border insets value applies
*/
public Insets getBorderInsets(Component c) {
int top, left, bottom, right;
Insets nextInsets;
top = left = right = bottom = 0;
if(outsideBorder != null) {
nextInsets = outsideBorder.getBorderInsets(c);
top += nextInsets.top;
left += nextInsets.left;
right += nextInsets.right;
bottom += nextInsets.bottom;
}
if(insideBorder != null) {
nextInsets = insideBorder.getBorderInsets(c);
top += nextInsets.top;
left += nextInsets.left;
right += nextInsets.right;
bottom += nextInsets.bottom;
}
return new Insets(top, left, bottom, right);
}
/**
* Returns the outside border object.
*/
public Border getOutsideBorder() {
return outsideBorder;
}
/**
* Returns the inside border object.
*/
public Border getInsideBorder() {
return insideBorder;
}
}