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package javax.swing.border;
import java.awt.BasicStroke;
import java.awt.Component;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Insets;
import java.awt.Paint;
import java.awt.RenderingHints;
import java.awt.geom.Rectangle2D;
import java.beans.ConstructorProperties;
A class which implements a border of an arbitrary stroke.
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 JavaBeans™
has been added to the java.beans package. Please see XMLEncoder.
Author: Sergey A. Malenkov Since: 1.7
/**
* A class which implements a border of an arbitrary stroke.
* <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™
* has been added to the <code>java.beans</code> package.
* Please see {@link java.beans.XMLEncoder}.
*
* @author Sergey A. Malenkov
*
* @since 1.7
*/
@SuppressWarnings("serial") // Same-version serialization only
public class StrokeBorder extends AbstractBorder {
private final BasicStroke stroke;
private final Paint paint;
Creates a border of the specified stroke. The component's foreground color will be used to render the border. Params: - stroke – the
BasicStroke object used to stroke a shape
Throws: - NullPointerException – if the specified
stroke is null
/**
* Creates a border of the specified {@code stroke}.
* The component's foreground color will be used to render the border.
*
* @param stroke the {@link BasicStroke} object used to stroke a shape
*
* @throws NullPointerException if the specified {@code stroke} is {@code null}
*/
public StrokeBorder(BasicStroke stroke) {
this(stroke, null);
}
Creates a border of the specified stroke and paint. If the specified paint is null, the component's foreground color will be used to render the border. Params: - stroke – the
BasicStroke object used to stroke a shape - paint – the
Paint object used to generate a color
Throws: - NullPointerException – if the specified
stroke is null
/**
* Creates a border of the specified {@code stroke} and {@code paint}.
* If the specified {@code paint} is {@code null},
* the component's foreground color will be used to render the border.
*
* @param stroke the {@link BasicStroke} object used to stroke a shape
* @param paint the {@link Paint} object used to generate a color
*
* @throws NullPointerException if the specified {@code stroke} is {@code null}
*/
@ConstructorProperties({ "stroke", "paint" })
public StrokeBorder(BasicStroke stroke, Paint paint) {
if (stroke == null) {
throw new NullPointerException("border's stroke");
}
this.stroke = stroke;
this.paint = paint;
}
Paints the border for the specified component with the specified position and size. If the border was not specified with a Paint object, the component's foreground color will be used to render the border. If the component's foreground color is not available, the default color of the Graphics object will be used. 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
Throws: - NullPointerException – if the specified
g is null
/**
* Paints the border for the specified component
* with the specified position and size.
* If the border was not specified with a {@link Paint} object,
* the component's foreground color will be used to render the border.
* If the component's foreground color is not available,
* the default color of the {@link Graphics} object will be used.
*
* @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
*
* @throws NullPointerException if the specified {@code g} is {@code null}
*/
@Override
public void paintBorder(Component c, Graphics g, int x, int y, int width, int height) {
float size = this.stroke.getLineWidth();
if (size > 0.0f) {
g = g.create();
if (g instanceof Graphics2D) {
Graphics2D g2d = (Graphics2D) g;
g2d.setStroke(this.stroke);
g2d.setPaint(this.paint != null ? this.paint : c == null ? null : c.getForeground());
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
g2d.draw(new Rectangle2D.Float(x + size / 2, y + size / 2, width - size, height - size));
}
g.dispose();
}
}
Reinitializes the insets parameter with this border's current insets. Every inset is the smallest (closest to negative infinity) integer value that is greater than or equal to the line width of the stroke that is used to paint the border. Params: - c – the component for which this border insets value applies
- insets – the
Insets object to be reinitialized
Throws: - NullPointerException – if the specified
insets is null
See Also: Returns: the reinitialized insets parameter
/**
* Reinitializes the {@code insets} parameter
* with this border's current insets.
* Every inset is the smallest (closest to negative infinity) integer value
* that is greater than or equal to the line width of the stroke
* that is used to paint the border.
*
* @param c the component for which this border insets value applies
* @param insets the {@code Insets} object to be reinitialized
* @return the reinitialized {@code insets} parameter
*
* @throws NullPointerException if the specified {@code insets} is {@code null}
*
* @see Math#ceil
*/
@Override
public Insets getBorderInsets(Component c, Insets insets) {
int size = (int) Math.ceil(this.stroke.getLineWidth());
insets.set(size, size, size, size);
return insets;
}
Returns the BasicStroke object used to stroke a shape during the border rendering. Returns: the BasicStroke object
/**
* Returns the {@link BasicStroke} object used to stroke a shape
* during the border rendering.
*
* @return the {@link BasicStroke} object
*/
public BasicStroke getStroke() {
return this.stroke;
}
Returns the Paint object used to generate a color during the border rendering. Returns: the Paint object or null if the paint parameter is not set
/**
* Returns the {@link Paint} object used to generate a color
* during the border rendering.
*
* @return the {@link Paint} object or {@code null}
* if the {@code paint} parameter is not set
*/
public Paint getPaint() {
return this.paint;
}
}