JavaFX 2.0 - Disable owner window for FileChooser

In last article "JavaFX 2.0: FileChooser, set initial directory from last directory", showOpenDialog(Window ownerWindow) was called with ownerWindow of "null". Such that the user can touch the parent window and re-open another FileChooser, can cause error!

We can pass the owner window, primaryStage, to showOpenDialog(primaryStage). Such that it will be blocked while the file dialog is being shown.

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package javafx_filechooser;

import java.io.File;
import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.layout.StackPane;
import javafx.scene.layout.VBox;
import javafx.stage.FileChooser;
import javafx.stage.Stage;

/**
 *
 * @author Seven
 */
public class JavaFX_FileChooser extends Application {
    
    File file;

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        launch(args);
    }
    
    @Override
    public void start(final Stage primaryStage) {
        primaryStage.setTitle("Hello World!");
        
        final Label labelFile = new Label();
        
        Button btn = new Button();
        btn.setText("Open FileChooser'");
        btn.setOnAction(new EventHandler<ActionEvent>() {

            @Override
            public void handle(ActionEvent event) {
                FileChooser fileChooser = new FileChooser();
                
                //Open directory from existing directory
                if(file != null){
                    File existDirectory = file.getParentFile();
                    fileChooser.setInitialDirectory(existDirectory);
                }

                //Set extension filter
                FileChooser.ExtensionFilter extFilter = new FileChooser.ExtensionFilter("AVI files (*.avi)", "*.avi");
                fileChooser.getExtensionFilters().add(extFilter);
                
                //Show open file dialog, with primaryStage blocked.
                file = fileChooser.showOpenDialog(primaryStage);
                
                labelFile.setText(file.getPath());
            }
        });
        
        VBox vBox = new VBox();
        vBox.getChildren().addAll(labelFile, btn);
        
        StackPane root = new StackPane();
        root.getChildren().add(vBox);
        primaryStage.setScene(new Scene(root, 300, 250));
        primaryStage.show();
    }
}

Related article:
- Use FileChooser.showOpenMultipleDialog() to open multi files.