java fx custom cell factory for combo box

To create a custom cell factory for a combo box in JavaFX, you can use the setCellFactory() method of the ComboBox class. This method allows you to specify a factory that will be used to create the cells that are displayed in the combo box.

Here's an example of how to create a custom cell factory for a combo box:

import javafx.scene.control.ComboBox;
import javafx.util.Callback;

public class Main {
  public static void main(String[] args) {
    ComboBox<String> comboBox = new ComboBox<>();

    // Set a custom cell factory for the combo box
    comboBox.setCellFactory(new Callback<>() {
      @Override
      public ListCell<String> call(ListView<String> param) {
        return new ListCell<>() {
          @Override
          protected void updateItem(String item, boolean empty) {
            super.updateItem(item, empty);
            if (empty || item == null) {
              setText(null);
            } else {
              setText(item);
            }
          }
        };
      }
    });
  }
}

This code creates a combo box and sets a custom cell factory for it using the setCellFactory() method. The cell factory is specified as an anonymous inner class that implements the Callback interface. The call() method of the Callback interface is overridden to return a custom ListCell object that displays the text of the item in the cell.

You can customize the appearance of the cells in the combo box by modifying the updateItem() method of the ListCell object. For example, you can set the text color, font, or background color of the cells by calling the appropriate methods on the ListCell object.

You can find more information about the ComboBox class and the setCellFactory() method in the JavaFX documentation.