Question

我有以下架构：

一种含有HBox和TilePane的VBox。

在HBox中有按钮，标签和文本字段。

每次我点击根（HBox）时，我都应该将一个ImageView添加到磁贴窗格。此ImageView shold包含一个图像（例如：＆＃34; 2.jpg＆＃34;）。磁贴窗格组件的最大值为5。

每次单击图像时，我都应该将新图像加载到单击的ImageView，例如＆＃34; 1.jpg＆＃34;。它不起作用。当我点击我的图像时，就像我点击根目录一样，它会创建另一个TilePane单元格。这是代码，你能帮助我吗？

/*
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package dadao1;

import java.util.HashSet;
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.control.TextField;
import javafx.scene.image.ImageView;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.HBox;
import javafx.scene.layout.StackPane;
import javafx.scene.layout.TilePane;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.stage.Stage;

/**
 *
 * @author Ambra
 */
public class Dadao1 extends Application {
    VBox root;
    HashSet dadi = new HashSet();
    //static int numeroDadi = 0;
    @Override
    public void start(Stage primaryStage) {       

        setGui();
        Scene scene = new Scene(root, 300, 300);

        primaryStage.setTitle("Hello World!");
        primaryStage.setScene(scene);
        primaryStage.show();
    } 
    /**
     *This private method sets up the GUI.
     * No parameters are required
     */
    private void setGui(){
        root = new VBox();
        HBox buttons = new HBox();
        final Button newGame = new Button("New Game");
        final Button print = new Button("Print");
        final Button animation = new Button("Moving");
        animation.addEventHandler(ActionEvent.ACTION, new EventHandler<ActionEvent>() {
            // this button is labeled "Moving" at the begin. If pressed it changes its label to "Dissolving" and viceversa.
            @Override
            public void handle(ActionEvent event) {
                if (animation.getText().equals(new String("Moving")))
                    animation.setText("Dissolving");
                else animation.setText("Mooving");
            }
        });
        final Label score = new Label("Total");
        final TextField points = new TextField();
        final Label pointsLabel = new Label("Score");
        root.setStyle("-fx-background-color: green");

        buttons.getChildren().addAll(newGame,print,animation,score,points,pointsLabel);
        final TilePane dadiPane = new TilePane();
        dadiPane.setVgap(10);
        dadiPane.setHgap(10);
        root.getChildren().addAll(buttons, dadiPane);

        root.setOnMouseClicked(new EventHandler<MouseEvent>() {

            @Override
            public void handle(MouseEvent event) {
                if(dadi.size()<5){
                    System.out.println("Adding img");
                    final ImageView img = new ImageView("2.jpg");
                    // should I put final in front of ImageView?
                    img.addEventHandler(ActionEvent.ACTION, new EventHandler<ActionEvent>() {

                        @Override
                        public void handle(ActionEvent event) {
                            // I want that when a tile is pressed an event occours.
                            // that event should be "add a new image to the ImageView just clicked",
                            // for example: img is not "2.jpg" but "3.jpj", by the way, I'm not able neither 
                            // to to print the folowing messagge :(
                            // It's like my root is pressed even if my mouse ha clicked at the image in img var.
                            System.out.println("Tile pressed ");
                        }
                    });
                    dadi.add(img);
                    dadiPane.getChildren().add(img);
                }else System.out.println("You cannot create more than 5 dices");
            }
        });
    }
    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        launch(args);
    }

}

Answer 1

ImageView s不生成ActionEvent s;因此，永远不会调用您的事件处理程序也就不足为奇了。由于ImageView未处理鼠标事件，因此它会传播到容器。

尝试

img.addEventHandler(MouseEvent.MOUSE_CLICKED, new EventHandler<MouseEvent>() {

     @Override
     public void handle(MouseEvent event) {
         System.out.println("Tile pressed ");
         event.consume();
     }
});

Answer 2

@James_D是正确的;但是对于Java 8，您可以使用更简单的语法：

img.addEventHandler(MouseEvent.MOUSE_CLICKED, event -> {
         System.out.println("Tile pressed ");
         event.consume();
     });

Answer 3

请注意，MouseEvent.MOUSE_CLICKED是javafx中的类，而不是java.awt.event包中的类

imgView. addEventHandler(javafx.scene.input.MouseEvent.MOUSE_CLICKED, event -> {
    //event clicked here
});

针对错误地import java.awt.event.MouseEvent上课的人

将EventHandler添加到VBox中包含的TilePane中包含的ImageView中？

3 个答案: