Исходный код

001/*
002 * Copyright (c) 2011, 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.beans.property;
027
028import javafx.beans.InvalidationListener;
029import javafx.beans.value.ChangeListener;
030
031import com.sun.javafx.binding.ExpressionHelper;
032
033/**
034 * Base class for all readonly properties wrapping a {@code boolean}. This class provides a default
035 * implementation to attach listener.
036 *
037 * @see ReadOnlyBooleanProperty
038 */
039public abstract class ReadOnlyBooleanPropertyBase extends ReadOnlyBooleanProperty {
040    
041    ExpressionHelper<Boolean> helper;
042
043    @Override 
044    public void addListener(InvalidationListener listener) {
045        helper = ExpressionHelper.addListener(helper, this, listener);
046    }
047
048    @Override 
049    public void removeListener(InvalidationListener listener) {
050        helper = ExpressionHelper.removeListener(helper, listener);
051    }
052    
053    @Override
054    public void addListener(ChangeListener<? super Boolean> listener) {
055        helper = ExpressionHelper.addListener(helper, this, listener);
056    }
057
058    @Override 
059    public void removeListener(ChangeListener<? super Boolean> listener) {
060        helper = ExpressionHelper.removeListener(helper, listener);
061    }
062    
063    /**
064     * Sends notifications to all attached
065     * {@link javafx.beans.InvalidationListener InvalidationListeners} and
066     * {@link javafx.beans.value.ChangeListener ChangeListeners}.
067     * 
068     * This method needs to be called, if the value of this property changes.
069     */
070    protected void fireValueChangedEvent() {
071        ExpressionHelper.fireValueChangedEvent(helper);
072    }
073    
074}