如何在滚动窗格内自动调整流盘的大小

Question

我想将目录中的图像加载到流盘中。流动盘在滚动盘内部。一切都很好，但是当最大化应用程序时，流盘不会使用其父级（即滚动盘）自动调整大小。我希望流窗格使用滚动盘自动调整自身大小。

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

<?import javafx.geometry.Insets?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Menu?>
<?import javafx.scene.control.MenuBar?>
<?import javafx.scene.control.MenuItem?>
<?import javafx.scene.control.ScrollPane?>
<?import javafx.scene.control.SplitPane?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.layout.FlowPane?>
<?import javafx.scene.layout.HBox?>
<?import javafx.scene.layout.VBox?>

<VBox maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="800.0" prefWidth="900.0" xmlns="http://javafx.com/javafx/11.0.1" xmlns:fx="http://javafx.com/fxml/1" fx:controller="application.MainController">
   <children>
      <MenuBar>
        <menus>
          <Menu mnemonicParsing="false" text="File">
            <items>
              <MenuItem mnemonicParsing="false" text="Close" />
            </items>
          </Menu>
          <Menu mnemonicParsing="false" text="Edit">
            <items>
              <MenuItem mnemonicParsing="false" text="Delete" />
            </items>
          </Menu>
          <Menu mnemonicParsing="false" text="Help">
            <items>
              <MenuItem mnemonicParsing="false" text="About" />
            </items>
          </Menu>
        </menus>
      </MenuBar>
      <VBox prefHeight="70.0" prefWidth="900.0">
         <children>
            <AnchorPane prefHeight="200.0" prefWidth="200.0" style="-fx-background-color: green;">
               <children>
                  <Button id="importBtn" layoutX="824.0" layoutY="12.0" mnemonicParsing="false" onMouseClicked="#importImages" prefHeight="43.0" prefWidth="62.0" text="Import" textFill="#e42d2d" AnchorPane.rightAnchor="14.0" />
               </children>
            </AnchorPane>
         </children>
      </VBox>
      <SplitPane dividerPositions="0.2828507795100223, 0.8028953229398663" prefHeight="436.0" prefWidth="900.0" VBox.vgrow="ALWAYS">
        <items>
          <AnchorPane minHeight="0.0" minWidth="0.0" prefHeight="160.0" prefWidth="100.0" />
            <ScrollPane pannable="true" prefHeight="737.0" prefWidth="506.0">
               <content>
                  <FlowPane fx:id="flowPane" FlowPane.  hgap="20.0" prefHeight="669.0" prefWidth="459.0" style="-fx-background-color: yellow;" vgap="20.0">
                     <padding>
                        <Insets bottom="10.0" left="10.0" right="10.0" top="10.0" />
                     </padding></FlowPane>
               </content>
            </ScrollPane>
          <AnchorPane maxWidth="200.0" minHeight="0.0" minWidth="0.0" prefHeight="160.0" prefWidth="100.0" />
        </items>
      </SplitPane>
      <HBox prefHeight="32.0" prefWidth="900.0" />
   </children>
</VBox>