165 lines
6.2 KiB
Java
165 lines
6.2 KiB
Java
/*
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* Copyright (c) 2010, 2011, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package javax.swing.border;
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import java.awt.BasicStroke;
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import java.awt.Component;
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import java.awt.Graphics;
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import java.awt.Graphics2D;
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import java.awt.Insets;
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import java.awt.Paint;
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import java.awt.RenderingHints;
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import java.awt.geom.Rectangle2D;
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import java.beans.ConstructorProperties;
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/**
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* A class which implements a border of an arbitrary stroke.
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* <p>
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* <strong>Warning:</strong>
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* Serialized objects of this class will not be compatible with
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* future Swing releases. The current serialization support is
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* appropriate for short term storage or RMI
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* between applications running the same version of Swing.
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* As of 1.4, support for long term storage of all JavaBeans™
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* has been added to the <code>java.beans</code> package.
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* Please see {@link java.beans.XMLEncoder}.
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*
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* @author Sergey A. Malenkov
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*
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* @since 1.7
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*/
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public class StrokeBorder extends AbstractBorder {
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private final BasicStroke stroke;
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private final Paint paint;
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/**
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* Creates a border of the specified {@code stroke}.
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* The component's foreground color will be used to render the border.
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*
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* @param stroke the {@link BasicStroke} object used to stroke a shape
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*
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* @throws NullPointerException if the specified {@code stroke} is {@code null}
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*/
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public StrokeBorder(BasicStroke stroke) {
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this(stroke, null);
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}
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/**
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* Creates a border of the specified {@code stroke} and {@code paint}.
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* If the specified {@code paint} is {@code null},
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* the component's foreground color will be used to render the border.
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*
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* @param stroke the {@link BasicStroke} object used to stroke a shape
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* @param paint the {@link Paint} object used to generate a color
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*
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* @throws NullPointerException if the specified {@code stroke} is {@code null}
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*/
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@ConstructorProperties({ "stroke", "paint" })
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public StrokeBorder(BasicStroke stroke, Paint paint) {
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if (stroke == null) {
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throw new NullPointerException("border's stroke");
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}
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this.stroke = stroke;
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this.paint = paint;
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}
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/**
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* Paints the border for the specified component
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* with the specified position and size.
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* If the border was not specified with a {@link Paint} object,
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* the component's foreground color will be used to render the border.
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* If the component's foreground color is not available,
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* the default color of the {@link Graphics} object will be used.
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*
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* @param c the component for which this border is being painted
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* @param g the paint graphics
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* @param x the x position of the painted border
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* @param y the y position of the painted border
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* @param width the width of the painted border
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* @param height the height of the painted border
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*
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* @throws NullPointerException if the specified {@code g} is {@code null}
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*/
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@Override
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public void paintBorder(Component c, Graphics g, int x, int y, int width, int height) {
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float size = this.stroke.getLineWidth();
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if (size > 0.0f) {
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g = g.create();
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if (g instanceof Graphics2D) {
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Graphics2D g2d = (Graphics2D) g;
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g2d.setStroke(this.stroke);
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g2d.setPaint(this.paint != null ? this.paint : c == null ? null : c.getForeground());
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g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
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RenderingHints.VALUE_ANTIALIAS_ON);
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g2d.draw(new Rectangle2D.Float(x + size / 2, y + size / 2, width - size, height - size));
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}
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g.dispose();
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}
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}
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/**
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* Reinitializes the {@code insets} parameter
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* with this border's current insets.
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* Every inset is the smallest (closest to negative infinity) integer value
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* that is greater than or equal to the line width of the stroke
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* that is used to paint the border.
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*
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* @param c the component for which this border insets value applies
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* @param insets the {@code Insets} object to be reinitialized
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* @return the reinitialized {@code insets} parameter
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*
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* @throws NullPointerException if the specified {@code insets} is {@code null}
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*
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* @see Math#ceil
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*/
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@Override
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public Insets getBorderInsets(Component c, Insets insets) {
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int size = (int) Math.ceil(this.stroke.getLineWidth());
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insets.set(size, size, size, size);
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return insets;
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}
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/**
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* Returns the {@link BasicStroke} object used to stroke a shape
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* during the border rendering.
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*
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* @return the {@link BasicStroke} object
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*/
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public BasicStroke getStroke() {
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return this.stroke;
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}
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/**
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* Returns the {@link Paint} object used to generate a color
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* during the border rendering.
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*
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* @return the {@link Paint} object or {@code null}
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* if the {@code paint} parameter is not set
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*/
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public Paint getPaint() {
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return this.paint;
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}
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}
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