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Rich-text area for JavaFX

There is a newer version: 0.11.3

package org.fxmisc.richtext.model;

/**
 * An object that specifies where a change occurred in a {@link org.fxmisc.richtext.GenericStyledArea}.
 */
public class RichTextChange extends TextChange, RichTextChange> {

    public RichTextChange(int position, StyledDocument removed, StyledDocument inserted) {
        super(position, removed, inserted);
    }

    @Override
    protected int removedLength() {
        return removed.length();
    }

    @Override
    protected int insertedLength() {
        return inserted.length();
    }

    @Override
    protected final StyledDocument concat(StyledDocument a, StyledDocument b) {
        return a.concat(b);
    }

    @Override
    protected final StyledDocument sub(StyledDocument doc, int from, int to) {
        return doc.subSequence(from, to);
    }

    @Override
    protected final RichTextChange create(int position, StyledDocument removed, StyledDocument inserted) {
        return new RichTextChange<>(position, removed, inserted);
    }

    public final PlainTextChange toPlainTextChange() {
        return new PlainTextChange(position, removed.getText(), inserted.getText());
    }

    /**
     * Equivalent to {@code richChange.toPlainTextChange().isIdentity()} but without the additional object
     * creation via {@link #toPlainTextChange()}.
     */
    public final boolean isPlainTextIdentity() {
        return removed.getText().equals(inserted.getText());
    }
}