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package javax.swing.border;
import java.awt.Graphics;
import java.awt.Insets;
import java.awt.Component;
import java.beans.ConstructorProperties;
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:
Border border = comp.getBorder();
Border margin = new EmptyBorder(10,10,10,10);
comp.setBorder(new CompoundBorder(border, margin));
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 applications running
the same version of Swing. As of 1.4, support for long term storage
of all JavaBeansTM
has been added to the java.beans package. Please see XMLEncoder.
Author: David Kloba
/**
* 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>
* <pre>
* Border border = comp.getBorder();
* Border margin = new EmptyBorder(10,10,10,10);
* comp.setBorder(new CompoundBorder(border, margin));
* </pre>
* <p>
* <strong>Warning:</strong>
* 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 applications running
* the same version of Swing. As of 1.4, support for long term storage
* of all JavaBeans<sup><font size="-2">TM</font></sup>
* has been added to the <code>java.beans</code> package.
* Please see {@link java.beans.XMLEncoder}.
*
* @author David Kloba
*/
public class CompoundBorder extends AbstractBorder {
protected Border outsideBorder;
protected Border insideBorder;
Creates a compound border with null outside and inside borders.
/**
* 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.
Params: - outsideBorder – the outside border
- insideBorder – the inside border to be nested
/**
* 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
*/
@ConstructorProperties({"outsideBorder", "insideBorder"})
public CompoundBorder(Border outsideBorder, Border insideBorder) {
this.outsideBorder = outsideBorder;
this.insideBorder = insideBorder;
}
Returns whether or not the compound border is opaque.
Returns: true if the inside and outside borders are each either null or opaque; or false otherwise
/**
* Returns whether or not the compound border is opaque.
*
* @return {@code true} if the inside and outside borders
* are each either {@code null} or opaque;
* or {@code false} otherwise
*/
@Override
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.
Params: - c – the component for which this border is being painted
- g – the paint graphics
- x – the x position of the painted border
- y – the y position of the painted border
- width – the width of the painted border
- height – the height of the painted border
/**
* 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);
}
Reinitialize the insets parameter with this Border's current Insets.
Params: - c – the component for which this border insets value applies
- insets – the object to be reinitialized
/**
* Reinitialize the insets parameter with this Border's current Insets.
* @param c the component for which this border insets value applies
* @param insets the object to be reinitialized
*/
public Insets getBorderInsets(Component c, Insets insets) {
Insets nextInsets;
insets.top = insets.left = insets.right = insets.bottom = 0;
if(outsideBorder != null) {
nextInsets = outsideBorder.getBorderInsets(c);
insets.top += nextInsets.top;
insets.left += nextInsets.left;
insets.right += nextInsets.right;
insets.bottom += nextInsets.bottom;
}
if(insideBorder != null) {
nextInsets = insideBorder.getBorderInsets(c);
insets.top += nextInsets.top;
insets.left += nextInsets.left;
insets.right += nextInsets.right;
insets.bottom += nextInsets.bottom;
}
return insets;
}
Returns the outside border object.
/**
* Returns the outside border object.
*/
public Border getOutsideBorder() {
return outsideBorder;
}
Returns the inside border object.
/**
* Returns the inside border object.
*/
public Border getInsideBorder() {
return insideBorder;
}
}