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POJavaFX Panel inside Panel auto resizing
 

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    <p>I have a JavaFX application which has only one FXML file. In this file I have one AnchorPane which has a StackPane inside it. Here is the screenshot:</p> <p><img src="https://i.stack.imgur.com/xtysq.png" alt="my panel inside panel application"></p> <p>When I start this application, I want to resize StackPane automatically with the AnchorPane. Thus; StackPane will get the current avaliable width and height automatically. At the moment when I resize the application, AnchorPane is being resized automatically but StackPane stays as his fixed size.</p> <p>How can I resize the StackPane automatically and make it fully stretched inside its parent panel?</p> <p><strong>My Code</strong></p> <p><em>Main.java</em></p> <pre><code>package app; 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 { public static void main(String[] args) { Application.launch(args); } @Override public void start(Stage stage) throws Exception { Parent root = FXMLLoader.load(getClass().getResource("Main.fxml")); Scene scene = new Scene(root,800,600); scene.getStylesheets().add(this.getClass().getResource("/app/style1.css").toExternalForm()); stage.setScene(scene); stage.show(); } } </code></pre> <p><em>MainController.java</em></p> <pre><code>package app; import java.net.URL; import java.util.ResourceBundle; import javafx.fxml.FXML; import javafx.fxml.Initializable; import javafx.scene.layout.AnchorPane; import javafx.scene.layout.StackPane; public class MainController implements Initializable { @FXML private AnchorPane anchorPane; @FXML private StackPane stackPane; @Override public void initialize(URL url, ResourceBundle rb) { stackPane.setPrefSize(anchorPane.getPrefWidth(), anchorPane.getPrefHeight()); //didn't work } } </code></pre> <p><em>Main.fxml</em></p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;?import java.lang.*?&gt; &lt;?import java.util.*?&gt; &lt;?import javafx.scene.*?&gt; &lt;?import javafx.scene.control.*?&gt; &lt;?import javafx.scene.layout.*?&gt; &lt;AnchorPane fx:id="anchorPane" xmlns:fx="http://javafx.com/fxml" fx:controller="app.MainController"&gt; &lt;StackPane fx:id="stackPane" &gt;&lt;/StackPane&gt; &lt;/AnchorPane&gt; </code></pre> <p><em>style1.css</em></p> <pre><code>#anchorPane { -fx-border-width: 2px; -fx-border-color: chartreuse; } #stackPane { -fx-border-width: 2px; -fx-border-color: red; /* didn't work */ -fx-hgap: 100%; -fx-vgap: 100%; } </code></pre>
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