button在将vbox和stackpane放入另一个stackpane后不起作用

3b6akqbq  于 2021-07-06  发布在  Java
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我想找一个 TextField 在屏幕中间 Circle 在它周围和圆圈下面的按钮。所以我做了一个 VBox 带着圆圈和按钮 StackPane 只有一个 TextField . 我又做了一个 StackPane 把两个 VBox 以及 StackPane 在同一个场景,但现在按钮不起作用。我真的不知道这是什么原因。
以下是我目前的代码。


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package circleandtextbox;

import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.Pos;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.TextField;
import javafx.scene.layout.Pane;
import javafx.scene.layout.StackPane;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.scene.shape.Circle;
import javafx.stage.Stage;

/**
 *
 * @author diego
 */
public class CircleAndTextBox extends Application {

    @Override
    public void start(Stage primaryStage) {
        int programX = 400;
        int programY = 400;
        int circleRadius = 100;
        Circle circle = new Circle(programX / 2,programY / 2,circleRadius);
        circle.setStroke(Color.RED);
        circle.setStrokeWidth(3);
        circle.setFill(Color.TRANSPARENT);

        TextField input = new TextField();
        input.setMaxWidth(100);

        Button btn = new Button();
        btn.setText("Change the size of the circle");
        btn.setOnAction((ActionEvent event) -> {
            System.out.println("It worked!");
        });

        VBox root = new VBox();
        root.setAlignment(Pos.CENTER);
        root.setSpacing(10);
        root.getChildren().addAll(circle,btn);

        StackPane textBox = new StackPane();
        textBox.setAlignment(Pos.CENTER);
        textBox.getChildren().add(input);

        StackPane together = new StackPane();
        together.getChildren().addAll(root,textBox);

        Scene scene = new Scene(together, programX, programY);

        primaryStage.setTitle("Circle code");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        launch(args);
    }

}
khbbv19g

khbbv19g1#

你的第二个 StackPane 覆盖您的 VBox ,隐藏其 Button . 要看到效果,就要改变

together.getChildren().addAll(root, textBox);

together.getChildren().addAll(textBox , root);

当然,现在 TextField 已覆盖。相反,使用单个 StackPane 对于圆和场:

StackPane textBox = new StackPane();
textBox.setAlignment(Pos.CENTER);
textBox.getChildren().addAll(circle, input);

然后将结果添加到 VBox 用按钮。

VBox root = new VBox();
root.setAlignment(Pos.CENTER);
root.setSpacing(10);
root.setPadding(new Insets(16));
root.getChildren().addAll(textBox, btn);


也可以考虑使用 Spinner 和/或 Slider ,此处显示,用于控制大小。测试代码:

import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.TextField;
import javafx.scene.layout.Pane;
import javafx.scene.layout.StackPane;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.scene.shape.Circle;
import javafx.stage.Stage;

/**
 * @author diego
 * @see https://stackoverflow.com/a/64852023/230513
 * @see https://stackoverflow.com/a/37935114/230513
 */
public class CircleAndTextBox extends Application {

    @Override
    public void start(Stage primaryStage) {
        int programX = 400;
        int programY = 400;
        int circleRadius = 100;
        Circle circle = new Circle(programX / 2,programY / 2,circleRadius);
        circle.setStroke(Color.RED);
        circle.setStrokeWidth(3);
        circle.setFill(Color.TRANSPARENT);

        TextField input = new TextField();
        input.setMaxWidth(100);

        Button btn = new Button();
        btn.setText("Change the size of the circle");
        btn.setOnAction((ActionEvent event) -> {
            System.out.println("It worked!");
        });

        StackPane textBox = new StackPane();
        textBox.setAlignment(Pos.CENTER);
        textBox.getChildren().addAll(circle, input);
        VBox root = new VBox();
        root.setAlignment(Pos.CENTER);
        root.setSpacing(10);
        root.setPadding(new Insets(16));
        root.getChildren().addAll(textBox, btn);

        Scene scene = new Scene(root);

        primaryStage.setTitle("Circle code");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        launch(args);
    }
}

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