Document events for text replacement

Question

Hello!
This is a question about Document events in JTextComponent.
Two document events in a row are fired when the user performs a text replacement (some text is selected and the user inserts or pastes new text): first, DocumentListener.removeUpdate is called for the selected text being removed; second, insertUpdate for the text being inserted or pasted.
The question is: how can I be aware that both events are related and exist in response for the same and unique action?
More specifically, I need to know that the remove event is part of a two-step edition in order to bypass execution flow.
I have some bizarre ideas in mind, like proxing the original ActionMap "paste" action (for pasting) and tracking the keyboard (for inserting), but I don't think this is a too elegant approach.
Please let me know if you would find helpful some sample code.
Thank you!

Answer 1

That's from JTextComponent replaceSelection() method source
   public void replaceSelection(String content) {
        Document doc = getDocument();
        if (doc != null) {
                if (doc instanceof AbstractDocument) {
                    ((AbstractDocument)doc).replace(p0, p1 - p0, content,null);
                else {
                    if (p0 != p1) {
                        doc.remove(p0, p1 - p0);
                    if (content != null && content.length() > 0) {
                        doc.insertString(p0, content, null);
...As you can see it calls ((AbstractDocument)doc).replace() in the most cases all the default EditorKits uses AbstractDocument extensions.
Then from AbstractDocument's replace
    public void replace(int offset, int length, String text,
                        AttributeSet attrs) throws BadLocationException {
        DocumentFilter filter = getDocumentFilter();
            if (filter != null) {
                filter.replace(getFilterBypass(), offset, length, text,
                               attrs);So I think you can set your own DocumentFilter and override the filter's replace. Set the flag replaceStarted=true and call super.replace(). In the DocumentListener just check the flag.