/* * Copyright (c) 1997, 2006, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation.  Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */package javax.swing.border; import java.awt.Graphics;import java.awt.Insets;import java.awt.Rectangle;import java.awt.Component;import java.io.Serializable; /** * A class that implements an empty border with no size. * This provides a convenient base class from which other border * classes can be easily derived. * <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 abstract class AbstractBorder implements Border, Serializable{    /**     * This default implementation does no painting.     * @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) {    }     /**     * This default implementation returns a new {@link Insets} object     * that is initialized by the {@link #getBorderInsets(Component,Insets)}     * method.     * By default the {@code top}, {@code left}, {@code bottom},     * and {@code right} fields are set to {@code 0}.     *     * @param c  the component for which this border insets value applies     * @return a new {@link Insets} object     */    public Insets getBorderInsets(Component c)       {        return getBorderInsets(c, new Insets(0, 0, 0, 0));    }     /**     * Reinitializes 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     * @return the <code>insets</code> object     */    public Insets getBorderInsets(Component c, Insets insets) {        insets.left = insets.top = insets.right = insets.bottom = 0;        return insets;    }     /**     * This default implementation returns false.     * @return false     */    public boolean isBorderOpaque() { return false; }     /**     * This convenience method calls the static method.     * @param c the component for which this border is being computed     * @param x the x position of the border     * @param y the y position of the border     * @param width the width of the border     * @param height the height of the border     * @return a <code>Rectangle</code> containing the interior coordinates     */    public Rectangle getInteriorRectangle(Component c, int x, int y, int width, int height) {        return getInteriorRectangle(c, this, x, y, width, height);    }     /**     * Returns a rectangle using the arguments minus the     * insets of the border. This is useful for determining the area     * that components should draw in that will not intersect the border.     * @param c the component for which this border is being computed     * @param b the <code>Border</code> object     * @param x the x position of the border     * @param y the y position of the border     * @param width the width of the border     * @param height the height of the border     * @return a <code>Rectangle</code> containing the interior coordinates     */    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);    }     /**     * Returns the baseline.  A return value less than 0 indicates the border     * does not have a reasonable baseline.     * <p>     * The default implementation returns -1.  Subclasses that support     * baseline should override appropriately.  If a value &gt;= 0 is     * returned, then the component has a valid baseline for any     * size &gt;= the minimum size and <code>getBaselineResizeBehavior</code>     * can be used to determine how the baseline changes with size.     *     * @param c <code>Component</code> baseline is being requested for     * @param width the width to get the baseline for     * @param height the height to get the baseline for     * @return the baseline or &lt; 0 indicating there is no reasonable     *         baseline     * @throws IllegalArgumentException if width or height is &lt; 0     * @see java.awt.Component#getBaseline(int,int)     * @see java.awt.Component#getBaselineResizeBehavior()     * @since 1.6     */    public int getBaseline(Component c, int width, int height) {        if (width < 0 || height < 0) {            throw new IllegalArgumentException(                    "Width and height must be >= 0");        }        return -1;    }     /**     * Returns an enum indicating how the baseline of a component     * changes as the size changes.  This method is primarily meant for     * layout managers and GUI builders.     * <p>     * The default implementation returns     * <code>BaselineResizeBehavior.OTHER</code>, subclasses that support     * baseline should override appropriately.  Subclasses should     * never return <code>null</code>; if the baseline can not be     * calculated return <code>BaselineResizeBehavior.OTHER</code>.  Callers     * should first ask for the baseline using     * <code>getBaseline</code> and if a value &gt;= 0 is returned use     * this method.  It is acceptable for this method to return a     * value other than <code>BaselineResizeBehavior.OTHER</code> even if     * <code>getBaseline</code> returns a value less than 0.     *     * @param c <code>Component</code> to return baseline resize behavior for     * @return an enum indicating how the baseline changes as the border is     *         resized     * @see java.awt.Component#getBaseline(int,int)     * @see java.awt.Component#getBaselineResizeBehavior()     * @since 1.6     */    public Component.BaselineResizeBehavior getBaselineResizeBehavior(            Component c) {        if (c == null) {            throw new NullPointerException("Component must be non-null");        }        return Component.BaselineResizeBehavior.OTHER;    }     /*     * Convenience function for determining ComponentOrientation.     * Helps us avoid having Munge directives throughout the code.     */    static boolean isLeftToRight( Component c ) {        return c.getComponentOrientation().isLeftToRight();    } }