java - 如何使用Javafx将TextField设置在顶部？

Question

大家好，

我是 Javafx 的初学者，尝试将 TextField 设置在顶部，并且我正在使用 GridPane。所以我尝试了这段代码，但这给了我错误:

源代码:

package sample;

import javafx.application.Application;
import javafx.geometry.HPos;
import javafx.geometry.VPos;
import javafx.scene.Scene;
import javafx.scene.layout.GridPane;
import javafx.scene.web.WebEngine;
import javafx.scene.web.WebView;
import javafx.stage.Stage;
import javafx.scene.control.TextField;
import javafx.geometry.HPos;

public class Main extends Application {
        @Override
        public void start (Stage primaryStage){
        primaryStage.setTitle("Modern web browser made by Rajendra Arora using JavaFX.");
        WebView wv = new WebView();
        WebEngine we = wv.getEngine();
        we.load("http://www.google.com/");

        TextField tf = new TextField("http://www.google.com/");
        tf.setMaxHeight(Double.MAX_VALUE);
        tf.positionCaret(25);
        GridPane sp = new GridPane();
        sp.getChildren().add(wv);
        GridPane.setConstraints(tf, 1, 0, 0, 0, HPos.CENTER, VPos.CENTER);

        Scene scene = new Scene(sp, 600, 500);
        primaryStage.setScene(scene);
        primaryStage.show();
        }

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

但出现此错误:

Exception in Application start method
Exception in thread "main" java.lang.RuntimeException: Exception in Application start method
    at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:894)
    at com.sun.javafx.application.LauncherImpl.access$000(LauncherImpl.java:56)
    at com.sun.javafx.application.LauncherImpl$1.run(LauncherImpl.java:158)
    at java.lang.Thread.run(Thread.java:744)
Caused by: java.lang.IllegalArgumentException: rowSpan must be greater or equal to 1, but was 0
    at javafx.scene.layout.GridPane.setRowSpan(GridPane.java:346)
    at javafx.scene.layout.GridPane.setConstraints(GridPane.java:591)
    at sample.Main.start(Main.java:27)
    at com.sun.javafx.application.LauncherImpl$8.run(LauncherImpl.java:837)
    at com.sun.javafx.application.PlatformImpl$7.run(PlatformImpl.java:335)
    at com.sun.javafx.application.PlatformImpl$6$1.run(PlatformImpl.java:301)
    at com.sun.javafx.application.PlatformImpl$6$1.run(PlatformImpl.java:298)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.sun.javafx.application.PlatformImpl$6.run(PlatformImpl.java:298)
    at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at com.sun.glass.ui.win.WinApplication.access$300(WinApplication.java:39)
    at com.sun.glass.ui.win.WinApplication$4$1.run(WinApplication.java:112)
    ... 1 more

请帮忙:(

帮助将不胜感激!

Answer 1

错误消息非常清楚:您正在调用方法 setConstraints(...)并为 rowSpan 和 colSpan 传入 0。错误消息表明您无法将 rowSpan 设置为零。 (您大概也不能将 colSpan 设置为零。)这些限制似乎是有道理的。