Autocompletion in codearea in javafx

Question

How could I create a listview at the current caret position in codearea while typing as autocompletion in javafx? So far I locate the word that is currently being typed and I see if that word is contained in the array. This is the code I have so far. Thank you in advance!

String[] keyphrases = new String[]{"int main(){\n}", "cout", "cin"};

((CodeArea)tabPane.getSelectionModel().getSelectedItem().getContent()).textProperty().addListener(new ChangeListener<String>()
                        {
                            @Override
                            public void changed(ObservableValue<? extends String> observableValue, String s, String s2) {
                                CodeArea sto = ((CodeArea)tabPane.getSelectionModel().getSelectedItem().getContent());
                                String curr = "";
                                String currFinal = "";
                                for (int i = sto.getAnchor(); i > 0; i--) {
                                    if (sto.getText().charAt(i) == '\n' || sto.getText().charAt(i) == ' ') {
                                        break;
                                    }else {
                                        curr += sto.getText().charAt(i);
                                    }
                                }
                                for (int i = curr.length()-1; i >= 0; i--) {
                                    currFinal += curr.charAt(i);
                                }
                                System.out.println(currFinal);
                                ArrayList<String> fil = new ArrayList<String>();
                                for (int i = 0; i < keyphrases.length; i++) {
                                    if (keyphrases[i].contains(currFinal)) {
                                        fil.add(keyphrases[i]);
                                    }
                                }
                                //display fil as listview in caret position?
                            } 
                        });

Answer 1

Using Sai's answer I created my own solution!

codeArea.textProperty().addListener(new ChangeListener<String>()
    {
        @Override
        public void changed(ObservableValue<? extends String> observableValue, String s, String s2) {
            
            
            String curr = "";
            String currFinal = "";
            for (int i = codeArea.getAnchor(); i > 0; i--) {
                if (codeArea.getText().charAt(i) == '\n' || codeArea.getText().charAt(i) == ' ') {
                    break;
                }else {
                    curr += codeArea.getText().charAt(i);
                }
            }
            
            for (int i = curr.length()-1; i >= 0; i--) {
                currFinal += curr.charAt(i);
            }
            
            if (currFinal != "") {
                ArrayList<String> fil = new ArrayList<String>();
                for (int i = 0; i < keyphrases.length; i++) {
                    if (keyphrases[i].contains(currFinal)) {
                        fil.add(keyphrases[i]);
                    }
                }
                System.out.println("Fil " + fil);
                if (popup != null) {
                    popup.hide();
                }
                if (fil.size() > 0) {
                    
                    
                    
                    ListView lop = new ListView();
                    for (int i = 0; i < fil.size(); i++) {
                        lop.getItems().add(fil.get(i));
                    }
                    
                    popup = new Popup();
                 
                    lop.setMaxHeight(80);
                    popup.getContent().addAll(lop);
                    popup.show(codeArea, codeArea.getCaretBounds().get().getMaxX(), codeArea.getCaretBounds().get().getMaxY());
                    codeArea.requestFocus();
                    
                }
                codeArea.requestFocus();
            }else { 
                if (popup != null) {
                    popup.hide();
                }
            }
        }
            
            
    });