Исходный код

001/*
002 * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
003 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004 *
005 * This code is free software; you can redistribute it and/or modify it
006 * under the terms of the GNU General Public License version 2 only, as
007 * published by the Free Software Foundation.  Oracle designates this
008 * particular file as subject to the "Classpath" exception as provided
009 * by Oracle in the LICENSE file that accompanied this code.
010 *
011 * This code is distributed in the hope that it will be useful, but WITHOUT
012 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
013 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
014 * version 2 for more details (a copy is included in the LICENSE file that
015 * accompanied this code).
016 *
017 * You should have received a copy of the GNU General Public License version
018 * 2 along with this work; if not, write to the Free Software Foundation,
019 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
020 *
021 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
022 * or visit www.oracle.com if you need additional information or have any
023 * questions.
024 */
025
026package javafx.scene.paint;
027
028import com.sun.javafx.beans.event.AbstractNotifyListener;
029import com.sun.javafx.tk.Toolkit;
030
031/**
032 * Base class for a color or gradients used to fill shapes and backgrounds when
033 * rendering the scene graph.
034 */
035public abstract class Paint {
036    /**
037     * @treatAsPrivate implementation detail
038     * @deprecated This is an internal API that is not intended for use and will be removed in the next version
039     */
040    static {
041        Toolkit.setPaintAccessor(new Toolkit.PaintAccessor() {
042
043            @Override
044            public boolean isMutable(Paint paint) {
045                return paint.acc_isMutable();
046            }
047
048            @Override
049            public Object getPlatformPaint(Paint paint) {
050                return paint.acc_getPlatformPaint();
051            }
052
053            @Override
054            public void addListener(Paint paint, AbstractNotifyListener platformChangeListener) {
055                paint.acc_addListener(platformChangeListener);
056            }
057            
058            @Override
059            public void removeListener(Paint paint, AbstractNotifyListener platformChangeListener) {
060                paint.acc_removeListener(platformChangeListener);
061            }
062            
063            
064        });
065    }
066    
067    boolean acc_isMutable() {
068        return false;
069    }
070
071    abstract Object acc_getPlatformPaint();
072    
073    void acc_addListener(AbstractNotifyListener platformChangeListener) {
074        throw new UnsupportedOperationException("Not Supported.");
075    }
076
077    void acc_removeListener(AbstractNotifyListener platformChangeListener) {
078        throw new UnsupportedOperationException("Not Supported.");
079    }
080    
081    /**
082     * Gets whether this Paint is completely opaque. An opaque paint is one that
083     * has no alpha component in any of its colors. It may be possible for a Paint
084     * to be opaque and yet return false, if it cannot be easily determined
085     * whether the paint is actually opaque. For example, the ImagePattern may not
086     * be able to cheaply determine its opacity.
087     *
088     * @return true if the Paint is opaque, false if it is not opaque or if
089     *         it cannot be determined.
090     */
091    public abstract boolean isOpaque();
092      
093    /**
094     * Creates a paint value from a string representation. Recognizes strings 
095     * representing {@code Color}, {@code RadialGradient} or {@code LinearGradient}.
096     * String specifying LinearGradient must begin with linear-gradient keyword
097     * and string specifying RadialGradient must begin with radial-gradient.
098     * 
099     * @param value the string to convert
100     * @throws NullPointerException if {@code value} is {@code null}
101     * @throws IllegalArgumentException if {@code value} cannot be parsed
102     * @return a {@code Color}, {@code RadialGradient} or {@code LinearGradient}
103     * object holding the value represented by the string argument.
104     * 
105     * @see Color#valueOf(String)
106     * @see LinearGradient#valueOf(String)
107     * @see RadialGradient#valueOf(String)
108     */
109    public static Paint valueOf(String value) {
110        if (value == null) {
111            throw new NullPointerException("paint must be specified");
112        }
113
114        if (value.startsWith("linear-gradient(")) {
115            return LinearGradient.valueOf(value);
116        } else if (value.startsWith("radial-gradient(")) {
117            return RadialGradient.valueOf(value);
118        } else {                
119            return Color.valueOf(value);
120        }
121    }
122}