Rendering problem when setting ChoiceBox elements with a service

I am preparing some examples to show the various features of FX when I came across this strange issue. I use a javafx.concurrent.Service to populate the items of a ChoiceBox. When I click the ChoiceBox to display a list of choices, I get only a blank rectangle with a triangle drawn on top. It's only when I click on the triangle the ChoiceBox gets correctly redrawn. From what I could see in the debugger is that the elements are there at the time when I click on the ChoiceBox.

final ChoiceBox<String> choiceBox = new ChoiceBox<>();
ExampleService service = new ExampleService();
service.setOnSucceeded(new EventHandler<WorkerStateEvent>() {
     @Override
     public void handle(WorkerStateEvent aEvent) {
          ObservableList<String> tempValue = (ObservableList<String>) aEvent.getSource().getValue();
          choiceBox.setItems(tempValue);
     }
});
service.start();

Screenshot: [url https://dl.dropbox.com/u/8978331/ChoiceBoxRenderingProblem.png] https://dl.dropbox.com/u/8978331/ChoiceBoxRenderingProblem.png
Code example: [url https://dl.dropbox.com/u/8978331/Example2App.java] https://dl.dropbox.com/u/8978331/Example2App.java

I'll write a Jira issue for this one, or is it my fault?

I use 1.7.0_10 - ea - b13 on Windows 7 64 bit, but same problem occurs on Mac OS X.

(PS: I could also use binding to accomplish this task, but unfortunately the RT-22449 prevents me to do).

Published by: Thilo 13 November 2012 10:57 to repair broken links

Looks like a bug to me. It is not related to the use of a service (or multithreading): the code below suffers from the same issue.

import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.ChoiceBox;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class ChoiceBoxTest extends Application {

  @Override
  public void start(Stage primaryStage) throws Exception {
    primaryStage.setTitle("Example 3");

    final ChoiceBox choiceBox = new ChoiceBox<>();
    final Button populateButton = new Button("Populate");
    populateButton.setOnAction(new EventHandler() {

      @Override
      public void handle(ActionEvent event) {
        ObservableList tempValue = FXCollections.observableArrayList();
        for (int i = 0; i < 10; i++) {
          tempValue.add("Item " + i);
        }
        choiceBox.setItems(tempValue);
        // This will work:
        // choiceBox.getItems().setAll(tempValue);
      }

    });

    VBox root = new VBox();
    root.getChildren().addAll(populateButton, choiceBox);
    primaryStage.setScene(new Scene(root, 300, 250));
    primaryStage.show();
  }

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

}

To work around this problem, replace

choiceBox.setItems(tempValue);

with

choiceBox.getItems().setAll(tempValue);

Tags: Java

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Rendering problem when setting ChoiceBox elements with a service

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