JavaFX：从Vbox中删除子级

Question

所以我是JavaFX的新手，我正在尝试为学校做一个应用程序，我已经阅读了很多相关的帖子，但我似乎不知道如何为我自己的案例做。这是一张照片

因此，大屏幕是我的主屏幕，带有红色边框的是Vbox的子屏幕。对于孩子，我有一个单独的FXML和一个控制器。当我点击“成交”按钮时，我想删除Vbox的特定子级。

我知道我应该做parent.get孩子（）。删除（specific_child_node）；问题是我不知道如何为按下“关闭交易”按钮的孩子获取specific_child_node。关闭按钮在孩子的控制器中，Vbox在主页控制器中

有人知道我该怎么做吗？

Answer 1

我创建了一个小示例来展示如何做到这一点：

主控制器类：

package sample;

import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.VBox;

import java.io.IOException;

public class MainController {

    @FXML
    private VBox middleVBox;

    @FXML
    public void handleAddChildBtnClick() {

        FXMLLoader loader = new FXMLLoader(getClass().getResource("deal.fxml"));
        GridPane root = null;
        try {
            root = loader.load();
        } catch (IOException ex) {
            ex.printStackTrace();
        }
        if (root == null) return;

        // Get the controller instance:
        DealController controller = loader.getController();

        // Set a reference for the parent vbox:
        controller.setParent(middleVBox);

        middleVBox.getChildren().add(1, root);
    }
}

FXML文件"main.fxml"：

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.layout.ColumnConstraints?>
<?import javafx.scene.layout.GridPane?>
<?import javafx.scene.layout.RowConstraints?>
<?import javafx.scene.layout.VBox?>

<GridPane alignment="center" xmlns="http://javafx.com/javafx/11.0.1" xmlns:fx="http://javafx.com/fxml/1" fx:controller="sample.MainController">
   <children>
      <VBox style="-fx-background-color: black;">
         <children>
            <Label text="Welcome, Client" textFill="WHITE" />
         </children>
      </VBox>
      <VBox fx:id="middleVBox" GridPane.columnIndex="1">
         <children>
            <Label text="Generate Public Auction" />
            <VBox>
               <children>
                  <Label text="dfgh" textFill="#1aab0d" />
               </children>
            </VBox>
         </children>
      </VBox>
      <VBox GridPane.columnIndex="2">
         <children>
            <Button mnemonicParsing="false" onAction="#handleAddChildBtnClick" text="Add Child" />
         </children>
      </VBox>
   </children>
   <columnConstraints>
      <ColumnConstraints />
      <ColumnConstraints />
      <ColumnConstraints />
   </columnConstraints>
   <rowConstraints>
      <RowConstraints prefHeight="200.0" />
   </rowConstraints>
</GridPane>

DealController类：

package sample;

import javafx.fxml.FXML;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.VBox;

public class DealController {

    @FXML
    private GridPane dealRoot;

    private VBox parent;

    @FXML
    public void handleCloseDealBtnClick() {
        parent.getChildren().remove(dealRoot);
    }

    void setParent(VBox parent) {
        this.parent = parent;
    }
}

FXML文件“deal.FXML”：

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.layout.ColumnConstraints?>
<?import javafx.scene.layout.GridPane?>
<?import javafx.scene.layout.RowConstraints?>

<GridPane fx:id="dealRoot" xmlns="http://javafx.com/javafx/11.0.1" xmlns:fx="http://javafx.com/fxml/1" fx:controller="sample.DealController">
  <columnConstraints>
    <ColumnConstraints hgrow="SOMETIMES" />
      <ColumnConstraints hgrow="SOMETIMES" />
  </columnConstraints>
  <rowConstraints>
    <RowConstraints vgrow="SOMETIMES" />
    <RowConstraints vgrow="SOMETIMES" />
  </rowConstraints>
   <children>
      <Label text="cvbn" textFill="#008612" />
      <Button mnemonicParsing="false" onAction="#handleCloseDealBtnClick" text="Close Deal" GridPane.columnIndex="1" GridPane.rowIndex="1" />
   </children>
</GridPane>

主要类别：

package sample;

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;

public class Main extends Application {

    @Override
    public void start(Stage primaryStage) throws Exception {
        Parent root = FXMLLoader.load(getClass().getResource("main.fxml"));
        primaryStage.setScene(new Scene(root));
        primaryStage.show();
    }


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