/* CompoundBorder.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
it under the terms of the GNU General Public License as published by
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Linking this library statically or dynamically with other modules is
making a combined work based on this library. Thus, the terms and
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As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
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package javax.swing.border;
import java.awt.Component;
import java.awt.Graphics;
import java.awt.Insets;
/**
* A Border that is composed of an interior and an exterior border,
* where the interior border is tightly nested into the exterior.
*
* @author Sascha Brawer (brawer@dandelis.ch)
*/
public class CompoundBorder
extends AbstractBorder
{
/**
* Determined using the <code>serialver</code> tool
* of Apple/Sun JDK 1.3.1 on MacOS X 10.1.5.
*/
static final long serialVersionUID = 9054540377030555103L;
/**
* The inside border, which is painted between the bordered
* Component and the outside border. It is valid for
* <code>insideBorder</code> to be <code>null</code>.
*/
protected Border insideBorder;
/**
* The outside border, which is painted outside both the
* bordered Component and the inside border. It is valid for
* <code>outsideBorder</code> to be <code>null</code>.
*/
protected Border outsideBorder;
/**
* Constructs a CompoundBorder whose inside and outside borders
* are both <code>null</code>. While this does not really make
* any sense (there exists a class EmptyBorder as well, and not
* every Component needs to have a border at all), the API
* specification requires the existence of this constructor.
*
* @see EmptyBorder
*/
public CompoundBorder ()
{
this (null, null);
}
/**
* Constructs a CompoundBorder with the specified inside and
* outside borders.
*
* @param outsideBorder the outside border, which is painted to the
* outside of both <code>insideBorder</code> and the enclosed
* component. It is acceptable to pass <code>null</code>, in
* which case no outside border is painted.
*
* @param insideBorder the inside border, which is painted to
* between <code>outsideBorder</code> and the enclosed
* component. It is acceptable to pass <code>null</code>, in
* which case no inside border is painted.
*/
public CompoundBorder (Border outsideBorder, Border insideBorder)
{
this.outsideBorder = outsideBorder;
this.insideBorder = insideBorder;
}
/**
* Determines whether or not this border is opaque. An opaque
* border fills every pixel in its area when painting. Partially
* translucent borders must return <code>false</code>, or ugly
* artifacts can appear on screen.
*
* @return <code>true</code> if both the inside and outside borders
* are opaque, or <code>false</code> otherwise.
*/
public boolean isBorderOpaque ()
{
/* While it would be safe to assume true for the opacity of
* a null border, this behavior would not be according to
* the API specification. Also, it is pathological to have
* null borders anyway.
*/
if ((insideBorder == null) || (outsideBorder == null))
return false;
return insideBorder.isBorderOpaque()
&& outsideBorder.isBorderOpaque();
}
/**
* Paints the compound border by first painting the outside border,
* then painting the inside border tightly nested into the outside.
*
* @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)
{
/* If there is an outside border, paint it and reduce the
* bounding box by its insets.
*/
if (outsideBorder != null)
{
Insets outsideInsets;
outsideBorder.paintBorder(c, g, x, y, width, height);
outsideInsets = outsideBorder.getBorderInsets(c);
x += outsideInsets.left;
y += outsideInsets.top;
/* Reduce width and height by the respective extent of the
* outside border.
*/
width -= outsideInsets.left + outsideInsets.right;
height -= outsideInsets.top + outsideInsets.bottom;
}
if (insideBorder != null)
insideBorder.paintBorder(c, g, x, y, width, height);
}
/**
* Changes the specified insets to the insets of this border,
* which is the sum of the insets of the inside and the outside
* border.
*
* @param c the component in the center of this border.
* @param insets an Insets object for holding the added insets.
*
* @return the <code>insets</code> object.
*/
public Insets getBorderInsets(Component c, Insets insets)
{
Insets borderInsets;
if (insets == null)
insets = new Insets (0,0,0,0);
else
insets.left = insets.right = insets.top = insets.bottom = 0;
/* If there is an outside border, add it to insets. */
if (outsideBorder != null)
{
borderInsets = outsideBorder.getBorderInsets(c);
insets.left += borderInsets.left;
insets.right += borderInsets.right;
insets.top += borderInsets.top;
insets.bottom += borderInsets.bottom;
}
/* If there is an inside border, add it to insets. */
if (insideBorder != null)
{
borderInsets = insideBorder.getBorderInsets(c);
insets.left += borderInsets.left;
insets.right += borderInsets.right;
insets.top += borderInsets.top;
insets.bottom += borderInsets.bottom;
}
return insets;
}
/**
* Determines the insets of this border, which is the sum of the
* insets of the inside and the outside border.
*
* @param c the component in the center of this border.
*/
public Insets getBorderInsets (Component c)
{
/* It is not clear why CompoundBorder does not simply inherit
* the implementation from AbstractBorder. However, we want
* to be compatible with the API specification, which overrides
* the getBorderInsets(Component) method.
*/
return getBorderInsets (c, null);
}
/**
* Returns the outside border, which is painted outside both the
* bordered Component and the inside border. It is valid for the
* result to be <code>null</code>.
*/
public Border getOutsideBorder ()
{
return outsideBorder;
}
/**
* Returns the inside border, which is painted between the bordered
* Component and the outside border. It is valid for the result to
* be <code>null</code>.
*/
public Border getInsideBorder ()
{
return insideBorder;
}
}