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AbstractBorder.java
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1998-06-30
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/*
* @(#)AbstractBorder.java 1.17 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.Rectangle;
import java.awt.Component;
import java.io.Serializable;
/**
* A class which implements an empty border with no size.
* This provides a convenient base class from which other border
* classes can be easily derived.
* <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 1.17 02/02/98
* @author David Kloba
*/
public abstract class AbstractBorder implements Border, Serializable
{
/** This default implementation does no painting. */
public void paintBorder(Component c, Graphics g, int x, int y, int width, int height) {
}
/** This default implementation returns the value of getBorderMargins. */
public Insets getBorderInsets(Component c) {
return new Insets(0, 0, 0, 0);
}
/** This default implementation returns false. */
public boolean isBorderOpaque() { return false; }
/** This is a convience method that calls the static method. */
public Rectangle getInteriorRectangle(Component c, int x, int y, int width, int height) {
return getInteriorRectangle(c, this, x, y, width, height);
}
/** This method returns a rectangle using the arguements minus the
* insets of the border. This is useful for determining the area
* that components should draw in that will not intersect the border.
*/
public static Rectangle getInteriorRectangle(Component c, Border b, int x, int y, int width, int height) {
Insets insets;
if(b != null)
insets = b.getBorderInsets(c);
else
insets = new Insets(0, 0, 0, 0);
return new Rectangle(x + insets.left,
y + insets.top,
width - insets.right - insets.left,
height - insets.top - insets.bottom);
}
}