JavaFX 15. TreeView Events

1. Main.java

package application;
    
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.stage.Stage;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.layout.BorderPane;
 
 
public class Main extends Application {
    @Override
    public void start(Stage primaryStage) {
        try {
 
            Parent root = FXMLLoader.load(getClass().getResource("/application/Main.fxml"));
            Scene scene = new Scene(root);
            scene.getStylesheets().add(getClass().getResource("application.css").toExternalForm());
            primaryStage.setScene(scene);
            primaryStage.show();
        } catch(Exception e) {
            e.printStackTrace();
        }
    }
    
    public static void main(String[] args) {
        launch(args);
    }
}

2. Main.fxml

<?xml version="1.0" encoding="UTF-8"?>
 
<?import javafx.scene.control.TreeView?>
<?import javafx.scene.layout.AnchorPane?>
 
<AnchorPane prefHeight="500.0" prefWidth="500.0" xmlns="http://javafx.com/javafx/8.0.60" xmlns:fx="http://javafx.com/fxml/1" fx:controller="application.MainController">
   <children>
      <TreeView fx:id="treeView" layoutX="14.0" layoutY="14.0" onContextMenuRequested="#mouseClick" onMouseClicked="#mouseClick" prefHeight="387.0" prefWidth="469.0" />
   </children>
</AnchorPane>
 

3. MainController.java

package application;
 
import java.net.URL;
import java.util.ResourceBundle;
 
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.TreeItem;
import javafx.scene.control.TreeView;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.input.MouseEvent;
 
public class MainController implements Initializable{
 
    @FXML
    TreeView <String> treeView;
    
    Image icon = new Image(getClass().getResourceAsStream("/img/folder.png"));
    @Override
    public void initialize(URL location, ResourceBundle resources) {
        ImageView[] iv = new ImageView[7];
        for (int i = 0; i < 7; i++) {
            iv[i] = new ImageView(icon);
            iv[i].setFitHeight(50);
            iv[i].setFitWidth(50);
        }
        
        
        TreeItem<String> root = new TreeItem<>("Root", iv[0]);
        root.setExpanded(true); // 처음부터 노드가 열려있도록 한다.
        
        
        TreeItem<String> nodeA = new TreeItem<>("node A", iv[1]);
        TreeItem<String> nodeB = new TreeItem<>("node B", iv[2]);
        TreeItem<String> nodeC = new TreeItem<>("node C", iv[3]);
        
        root.getChildren().addAll(nodeA, nodeB, nodeC);
        /*root.getChildren().add(nodeA);
        root.getChildren().add(nodeB);
        root.getChildren().add(nodeC);*/ 
        
        nodeA.setExpanded(true);
        
        TreeItem<String> nodeA1 = new TreeItem<>("node A1", iv[4]);
        TreeItem<String> nodeB1 = new TreeItem<>("node B1", iv[5]);
        TreeItem<String> nodeC1 = new TreeItem<>("node C1", iv[6]);
        
        nodeA.getChildren().addAll(nodeA1, nodeB1, nodeC1);
        
        treeView.setRoot(root);
    }
 
    public void mouseClick(MouseEvent mouseEvent) {
        if (mouseEvent.getClickCount() == 2){
        TreeItem<String> item = treeView.getSelectionModel().getSelectedItem();
        System.out.println(item.getValue());
        }
    }
}