Java tutorial
/* * Copyright (c) 2011, 2017, 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 javafx.css; import com.sun.javafx.css.PseudoClassState; /** * PseudoClass represents one unique pseudo-class state. Introducing a * pseudo-class into a JavaFX class only requires that the method * {@link javafx.scene.Node#pseudoClassStateChanged(javafx.css.PseudoClass, boolean)} * be called when the pseudo-class state changes. Typically, the * {@code pseudoClassStateChanged} method is called from the * {@code protected void invalidated()} method of one of the property base * classes in the {@code javafx.beans.property} package. * <p> * Note that if a node has a default pseudo-class state, a horizontal orientation * for example, {@code pseudoClassStateChanged} should be called from the * constructor to set the initial state. * <p> * The following example would allow "xyzzy" to be used as a * pseudo-class in a CSS selector. * <pre><code> * public boolean isMagic() { * return magic.get(); * } * * public BooleanProperty magicProperty() { * return magic; * } * * public BooleanProperty magic = * new BooleanPropertyBase(false) { * * {@literal @}Override protected void invalidated() { * pseudoClassStateChanged(MAGIC_PSEUDO_CLASS. get()); * } * * {@literal @}Override public Object getBean() { * return MyControl.this; * } * * {@literal @}Override public String getName() { * return "magic"; * } * } * * private static final PseudoClass * MAGIC_PSEUDO_CLASS = PseudoClass.getPseudoClass("xyzzy"); * </code></pre> * @since JavaFX 8.0 */ public abstract class PseudoClass { /** * There is only one PseudoClass instance for a given pseudoClass. * @param pseudoClass the pseudo-class * @return The PseudoClass for the given pseudoClass. Will not return null. * @throws IllegalArgumentException if pseudoClass parameter is null or an empty String */ public static PseudoClass getPseudoClass(String pseudoClass) { return PseudoClassState.getPseudoClass(pseudoClass); } /** @return the pseudo-class state */ abstract public String getPseudoClassName(); }