Spec-Zone .ru
спецификации, руководства, описания, API
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
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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
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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 an arbitrary {@code Object}. This class provides a default
035 * implementation to attach listener.
036 *
037 * @see ReadOnlyObjectProperty
038 *
039 * @param <T> the type of the wrapped {@code Object}
040 */
041public abstract class ReadOnlyObjectPropertyBase<T> extends ReadOnlyObjectProperty<T> {
042    
043    ExpressionHelper<T> helper;
044
045    @Override 
046    public void addListener(InvalidationListener listener) {
047        helper = ExpressionHelper.addListener(helper, this, listener);
048    }
049
050    @Override 
051    public void removeListener(InvalidationListener listener) {
052        helper = ExpressionHelper.removeListener(helper, listener);
053    }
054    
055    @Override
056    public void addListener(ChangeListener<? super T> listener) {
057        helper = ExpressionHelper.addListener(helper, this, listener);
058    }
059
060    @Override 
061    public void removeListener(ChangeListener<? super T> listener) {
062        helper = ExpressionHelper.removeListener(helper, listener);
063    }
064    
065    /**
066     * Sends notifications to all attached
067     * {@link javafx.beans.InvalidationListener InvalidationListeners} and
068     * {@link javafx.beans.value.ChangeListener ChangeListeners}.
069     * 
070     * This method needs to be called, if the value of this property changes.
071     */
072    protected void fireValueChangedEvent() {
073        ExpressionHelper.fireValueChangedEvent(helper);
074    }
075    
076}