Merge the ReplaceEdit(remove and insertString edit) into a single CompoundEdit

• download example.jar
• download src.zip
• repository

Code

class DocumentFilterUndoManager extends UndoManager {
  private CompoundEdit compoundEdit;
  public final DocumentFilter undoFilter = new DocumentFilter() {
    @Override public void replace(
        DocumentFilter.FilterBypass fb,
        int offset, int length, String text,
        AttributeSet attrs) throws BadLocationException {
      if (length == 0) {
        fb.insertString(offset, text, attrs);
      } else {
        compoundEdit = new CompoundEdit();
        fb.replace(offset, length, text, attrs);
        compoundEdit.end();
        addEdit(compoundEdit);
        compoundEdit = null;
      }
    }
  };
  @Override public void undoableEditHappened(UndoableEditEvent e) {
    if (compoundEdit == null) {
      addEdit(e.getEdit());
    } else {
      compoundEdit.addEdit(e.getEdit());
    }
  }
}

References

• Merge the ReplaceEdit(remove and insertString edit) into a single CompoundEdit(Japanese)