ScrollPane setVvalue（）在Javafx中不工作

Question

我试过下面的代码来创建动态TextField，并将它添加到ScrollPane中的VBox中。但是我面临的问题是，如果添加的TextField数量超过TextField在ScrollPane中不可见。

The line scrollPane.setVvalue（Double.MAX_VALUE）;不管用。

ScrollPaneDemo.java

package scrollpanedemo; 

import java.util.ArrayList; 
import java.util.List; 
import javafx.application.Application; 
import javafx.scene.Scene; 
import javafx.scene.control.ScrollPane; 
import javafx.scene.control.TextField; 
import javafx.scene.input.KeyCode; 
import javafx.scene.input.KeyEvent; 
import javafx.scene.layout.HBox; 
import javafx.scene.layout.Priority; 
import javafx.scene.layout.VBox; 
import javafx.stage.Stage; 

/** 
* 
* @author vikassingh 
*/ 
public class ScrollPaneDemo extends Application { 

    VBox vboxInner = new VBox(); 
    ScrollPane scrollPane = new ScrollPane(); 
    List<TextFieldClass> textfieldClass = new ArrayList<TextFieldClass>(); 

    @Override 
    public void start(Stage primaryStage) { 

     VBox.setVgrow(vboxInner, Priority.ALWAYS); 
     vboxInner.setPrefHeight(200); 
     vboxInner.getChildren().clear(); 
     textfieldClass.clear(); 
     newRow(); 
     scrollPane.setContent(vboxInner); 

     Scene scene = new Scene(scrollPane, 300, 250); 

     primaryStage.setScene(scene); 
     primaryStage.show(); 
    } 

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

    private void newRow() { 
     // Add row 
     textfieldClass.add(new TextFieldClass(new TextField())); 
     TextField newTextFileld = null; 
     HBox productDHbox = null; 
     for (TextFieldClass ctObject : textfieldClass) { 
      newTextFileld = ctObject.getTextField(); 
     } 

     vboxInner.getChildren().add(newTextFileld); 
     // Rate TextField Listner 
     newTextFileld.addEventFilter(KeyEvent.KEY_PRESSED, event -> { 
      if (event.getCode().equals(KeyCode.ENTER) || event.getCode().equals(KeyCode.TAB) || event.getCode().equals(KeyCode.RIGHT)) { 
       // Add new TextField 
       newRow(); 

       // 
       //**** Ensure Visibility of last TextField (Not working) 

       scrollPane.setVvalue(Double.MAX_VALUE); 

       //***** Ensure Visibility of last TextField (Not working) 
       // 

       textfieldClass.get(textfieldClass.size() - 1).getTextField().requestFocus(); 
       event.consume(); 
      } 

     }); 
    } 

} 

TextFieldClass.java

package scrollpanedemo; 

import javafx.scene.control.TextField; 

/** 
* 
* @author vikassingh 
*/ 
class TextFieldClass { 

    private final TextField newTextFiled; 

    TextFieldClass(TextField newTextFiled) { 

     this.newTextFiled = newTextFiled; 
    } 

     // First textfield 
    public TextField getTextField() { 
     return newTextFiled; 
    } 

} 

Answer 1

我只动setVvalue（）如果条件块之后的语句。它没有完全解决您的问题，但是当用户输入内容时，最后的文本字段将自动显示。

newTextFileld.addEventFilter(KeyEvent.KEY_PRESSED, event -> 
    { 
     if (event.getCode().equals(KeyCode.ENTER) || event.getCode().equals(KeyCode.TAB) 
       || event.getCode().equals(KeyCode.RIGHT)) 
     { 
      // Add new TextField 
      newRow(); 

      textfieldClass.get(textfieldClass.size() - 1).getTextField().requestFocus(); 
      event.consume(); 
     } 
     scrollPane.setVvalue(Double.MAX_VALUE); 

    });