JavaFX Tutorial - Java ComboBox .setCellFactory (Callback < ListView < T >, ListCell < T >> value)

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Syntax

ComboBox.setCellFactory(Callback < ListView < T >, ListCell < T >> value) has the following syntax.

public final void setCellFactory(Callback < ListView < T >, ListCell < T >> value)

Example

In the following code shows how to use ComboBox.setCellFactory(Callback < ListView < T >, ListCell < T >> value) method.

import javafx.application.Application;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.Insets;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.ComboBox;
import javafx.scene.control.Label;
import javafx.scene.control.ListCell;
import javafx.scene.control.ListView;
import javafx.scene.control.TextArea;
import javafx.scene.control.TextField;
import javafx.scene.layout.GridPane;
import javafx.scene.paint.Color;
import javafx.stage.Stage;
import javafx.util.Callback;
//  ww w.j  a v a 2  s  .  c  om
public class Main extends Application {
  public static void main(String[] args) {
    launch(args);
  }

  @Override
  public void start(Stage stage) {
    stage.setTitle("ComboBoxSample");
    Scene scene = new Scene(new Group(), 450, 250);

    ComboBox emailComboBox = new ComboBox();
    emailComboBox.getItems().addAll("A","B","C","D","E");
    emailComboBox.setCellFactory(
        new Callback<ListView<String>, ListCell<String>>() {
            @Override public ListCell<String> call(ListView<String> param) {
                final ListCell<String> cell = new ListCell<String>() {
                    {
                        super.setPrefWidth(100);
                    }    
                    @Override public void updateItem(String item, 
                        boolean empty) {
                            super.updateItem(item, empty);
                            if (item != null) {
                                setText(item);    
                                if (item.contains("A")) {                                    
                                    setTextFill(Color.RED);
                                }
                                else if (item.contains("B")){
                                    setTextFill(Color.GREEN);
                                }
                                else {
                                    setTextFill(Color.BLACK);
                                }
                            }
                            else {
                                setText(null);
                            }
                        }
            };
            return cell;
        }
                    
    });
    
    GridPane grid = new GridPane();
    grid.setVgap(4);
    grid.setHgap(10);
    grid.setPadding(new Insets(5, 5, 5, 5));
    grid.add(new Label("To: "), 0, 0);
    grid.add(emailComboBox, 1, 0);
    
    
    Group root = (Group) scene.getRoot();
    root.getChildren().add(grid);
    stage.setScene(scene);
    stage.show();

  }
}

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