如何更改javafx中listview中仅第一个单元格的背景颜色？

Question

How can I change the background color of only the first cell in listview in JavaFX?I only want to change the background color of the first cell in the listview. Is there any way to do this.

Answer 1

You would need to implement a custom CellFactory on the ListView . We can then determine if the cell belongs to the first item in the List you used to populate the Listview . If so, apply a different style to just that cell.

I am not aware if there is a way to determine the first cell of a ListView , but we can certainly capture the first item in a List .

Consider the following application. We have a ListView that just displays a list of strings.

We set a custom CellFactory on the ListView and set the cell style if the item is the first in the List populating the ListView .

---

import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.ListCell;
import javafx.scene.control.ListView;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class Main extends Application {

    public static void main(String[] args) {
        launch(args);
    }

    @Override
    public void start(Stage primaryStage) {

        // Simple interface
        VBox root = new VBox(5);
        root.setPadding(new Insets(10));
        root.setAlignment(Pos.CENTER);

        // Create the ListView
        ListView<String> listView = new ListView<>();
        listView.getItems().setAll("Title", "One", "Two", "Three", "Four", "Five");

        // Set the CellFactory for the ListView
        listView.setCellFactory(list -> {
            ListCell<String> cell = new ListCell<String>() {
                @Override
                protected void updateItem(String item, boolean empty) {
                    super.updateItem(item, empty);
                    if (empty || item == null) {
                        // There is no item to display in this cell, so leave it empty
                        setGraphic(null);

                        // Clear the style from the cell
                        setStyle(null);
                    } else {
                        // If the item is equal to the first item in the list, set the style
                        if (item.equalsIgnoreCase(list.getItems().get(0))) {
                            // Set the background color to blue
                            setStyle("-fx-background-color: blue; -fx-text-fill: white");
                        }
                        // Finally, show the item text in the cell
                        setText(item);

                    }
                }
            };
            return cell;
        });

        root.getChildren().add(listView);

        // Show the Stage
        primaryStage.setScene(new Scene(root));
        primaryStage.show();
    }
}

The Result

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Obviously, you'll need to make some adjustments to match your data model and just matching by a String would not be the best approach.

This does not prevent the user from selecting the first item and may not work as expected if the list is sorted after building the Scene.

While this may answer your direct question, there are other things to consider in order to ensure a good experience for the user.