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Rich text control for JavaFX
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/*
 * Copyright (c) 2022, Gluon
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see .
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL GLUON BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package com.gluonhq.richtextarea.model;

import javafx.beans.property.ReadOnlyIntegerProperty;
import javafx.beans.property.ReadOnlyIntegerWrapper;

import java.util.HashSet;
import java.util.Objects;
import java.util.Set;
import java.util.function.Consumer;

public abstract class AbstractTextBuffer implements TextBuffer {

    private final Set> listeners = new HashSet<>();

    // textLengthProperty
    final ReadOnlyIntegerWrapper textLengthProperty = new ReadOnlyIntegerWrapper(this, "textLength");
    public ReadOnlyIntegerProperty textLengthProperty() {
        return textLengthProperty.getReadOnlyProperty();
    }
    public int getTextLength() {
        return textLengthProperty.get();
    }

    public final void addChangeListener(Consumer listener) {
        listeners.add(Objects.requireNonNull(listener));
    }

    public final void removeChangeListener(Consumer listener) {
        listeners.remove(Objects.requireNonNull(listener));
    }

    protected void fire( TextBuffer.Event event ) {
        listeners.forEach(l -> l.accept(event));
    }

}