Develop Reference

JavaFX FXML: Expand ScrollPane to Fit height of its Content Pane Until it reahces its MaxHeight property

I have the following FXML view:
VBox
ScrollPane
VBox buttonsContainer
Button (Adds a new button to buttonsContainer)
I want the ScrollPane to expand its height to match its child vbox's height, until it reaches a certain height [200px for example] then it stops expanding.
I've been playing around for the past 1 hour with the Min/Pref Viewport Height, and Min/Max/Pref Height properties to achieve this, but nothing worked out.
Is this this possible to do?
Edit: Here's a minimal, complete, and verifiable example :
MainView.fxml
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.ScrollPane?>
<?import javafx.scene.layout.VBox?>
<VBox alignment="CENTER" prefHeight="0.0" prefWidth="200.0" spacing="5.0" xmlns="http://javafx.com/javafx/8.0.60" xmlns:fx="http://javafx.com/fxml/1" fx:controller="MainController">
<ScrollPane maxHeight="200.0" VBox.vgrow="ALWAYS">
<VBox fx:id="_buttonsContainer" />
</ScrollPane>
<Button fx:id="_btnAddButton" mnemonicParsing="false" text="Button" />
</VBox>
MainController.java
public class MainController implements Initializable{
#FXML private Button _btnAddButton;
#FXML private VBox _buttonsContainer;
#Override
public void initialize(URL location, ResourceBundle resources) {
_btnAddButton.setOnAction(e -> {
addButton();
});
}
private void addButton(){
_buttonsContainer.getChildren().add(new Button());
}
}

This seems to work:
<ScrollPane fx:id="scrollPane" maxHeight="200.0" minViewportHeight="0.0" minHeight="0.0">
<VBox fx:id="_buttonsContainer" />
</ScrollPane>
The scroll pane, and its viewport, seem to have some fixed positive minimum height by default.

ScrollPane.prefHeightProperty().bind(VBox.heightProperty());
then add ScrollPane.setMaxHeight(200); try this

JavaFX WebView scrolled issue

I've developed an application using JavaFX that, in part, uses a WebView. However, I've noticed that when either by the user or programmatically via JS, the WebView is scrolled to the bottom or just near the bottom, strange things seem to happen. I am specifically hoping for some way to stop this behavior, and still need to allow scrolling in both senses. It's similar to this question but they are not the same. The rest of my post explains what is happening.
If you scroll to the bottom and resize the window to be larger than previously and hover over other JavaFX controls in the window, they become white boxes.
To illustrate, suppose you have the following window:
Scroll to the bottom and resize the window to be larger than previously and then hover over the JavaFX button and TextBox, who both disappear when you do so:
This happens on at least Windows 10 with Java8u111 and Java8u51. I've made an example to demonstrate this:
example.Main.java
package example;
import java.io.IOException;
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Scene;
import javafx.scene.layout.BorderPane;
import javafx.stage.Stage;
public class Main extends Application {
#Override
public void start(Stage primaryStage) throws IOException {
FXMLLoader loader = new FXMLLoader();
loader.setLocation(Main.class.getResource("Example.fxml"));
BorderPane rootWindow = (BorderPane) loader.load();
Scene scene = new Scene(rootWindow);
primaryStage.setScene(scene);
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}
example.ExampleController.java
package example;
import javafx.concurrent.Worker;
import javafx.fxml.FXML;
import javafx.scene.web.WebEngine;
import javafx.scene.web.WebView;
public class ExampleController {
#FXML private WebView webView;
#FXML
private void initialize() {
WebEngine engine = webView.getEngine();
engine.load("https://stackoverflow.com");
engine.getLoadWorker().stateProperty().addListener( (o, oldVal, newVal) -> {
if (newVal == Worker.State.SUCCEEDED) {
engine.executeScript("window.scrollTo(0, document.body.scrollHeight);");
}
});
}
}
example.Example.fxml
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.geometry.Insets?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.TextField?>
<?import javafx.scene.layout.BorderPane?>
<?import javafx.scene.layout.HBox?>
<?import javafx.scene.web.WebView?>
<BorderPane prefHeight="400.0" prefWidth="500.0" xmlns:fx="http://javafx.com/fxml/1" xmlns="http://javafx.com/javafx/8.0.111" fx:controller="example.ExampleController">
<center>
<WebView fx:id="webView" prefHeight="200.0" prefWidth="200.0" BorderPane.alignment="CENTER">
<BorderPane.margin>
<Insets bottom="10.0" left="10.0" right="10.0" top="10.0" />
</BorderPane.margin>
</WebView>
</center>
<bottom>
<HBox BorderPane.alignment="CENTER">
<children>
<TextField HBox.hgrow="ALWAYS" />
<Button alignment="TOP_LEFT" mnemonicParsing="false" text="Button" />
</children>
</HBox>
</bottom>
</BorderPane>
Is there a way I can stop this from happening or at least mitigate it?

I also encountered the same problem, and I found a solution：
Add a parameter to jvm：-Dprism.order=sw
see:https://news.kynosarges.org/2016/04/09/javafx-and-java_tool_options/?tdsourcetag=s_pctim_aiomsg

Transparent stage/scene loses its transparency after loading another FXML file

When I start my application my transparent javafx.stage.Stage shows a half transparent image as expected. But after a second stage is loaded the first stage loses its transparency.
The weird thing is that if the second fxml file ("MainScreen.fxml") doesn't contains any components like buttons or text fields, the background stays transparent.
I'm using JavaFX with JavaSE-1.8 in eclipse neon.2 on macOS Sierra.
Main class
package customPackage.main;
import javafx.animation.FadeTransition;
import javafx.application.Application;
import javafx.application.Platform;
import javafx.geometry.Rectangle2D;
import javafx.scene.Scene;
import javafx.scene.paint.Color;
import javafx.stage.Screen;
import javafx.stage.Stage;
import javafx.stage.StageStyle;
import javafx.util.Duration;
public class Main extends Application implements Runnable {
private Stage primaryStage;
private Stage stage;
private Controller launchController;
#Override
public void start(Stage primaryStage) {
this.primaryStage = primaryStage;
launchController = new Controller("LaunchScreen.fxml");
Scene launchScene = new Scene(launchController);
launchScene.setFill(Color.TRANSPARENT);
primaryStage.initStyle(StageStyle.TRANSPARENT);
primaryStage.setAlwaysOnTop(true);
primaryStage.setResizable(false);
primaryStage.setScene(launchScene);
primaryStage.show();
Thread thread = new Thread(this);
thread.start();
}
#Override
public void run() {
try {
Thread.sleep(3000);
// simulate work
} catch (InterruptedException e) {
e.printStackTrace();
}
Controller controller = new Controller("MainScreen.fxml");
Scene scene = new Scene(controller);
Platform.runLater(new Runnable() {
#Override
public void run() {
stage = new Stage();
stage.initStyle(StageStyle.UNDECORATED);
stage.setResizable(false);
stage.setScene(scene);
stage.show();
}
});
}
}
Controller class
package customPackage.main;
import java.io.IOException;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.scene.control.ProgressBar;
import javafx.scene.layout.AnchorPane;
public class LaunchController extends AnchorPane {
#FXML
private ProgressBar bar;
public LaunchController(String filename) {
FXMLLoader fxmlLoader = new FXMLLoader(getClass().getResource(filename));
fxmlLoader.setRoot(this);
fxmlLoader.setController(this);
try {
fxmlLoader.load();
} catch (IOException e) {
e.printStackTrace();
}
}
}
FXML File ("LaunchScreen.fxml")
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.effect.*?>
<?import javafx.scene.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.image.*?>
<?import java.lang.*?>
<?import javafx.scene.layout.*?>
<?import javafx.scene.layout.AnchorPane?>
<fx:root fx:id="pane" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="326.0" prefWidth="883.0" type="AnchorPane" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1">
<children>
<ImageView fitHeight="326.0" fitWidth="883.0" layoutX="7.0" layoutY="134.0" pickOnBounds="true" preserveRatio="true" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0">
<image>
<Image url="#http://www.lunapic.com/editor/premade/transparent.gif" />
</image>
</ImageView>
</children>
<cursor>
<Cursor fx:constant="DEFAULT" />
</cursor>
</fx:root>
FXML File ("MainScreen.fxml")
<?xml version="1.0" encoding="UTF-8"?>
<?import java.net.*?>
<?import javafx.geometry.*?>
<?import javafx.scene.image.*?>
<?import javafx.scene.control.*?>
<?import java.lang.*?>
<?import javafx.scene.layout.*?>
<?import javafx.scene.layout.AnchorPane?>
<fx:root fx:id="pane" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="720.0" prefWidth="1280.0" type="AnchorPane" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1">
<children>
<ImageView fitHeight="720.0" fitWidth="1280.0" pickOnBounds="true" preserveRatio="true" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0">
<image>
<Image url="#http://i.telegraph.co.uk/multimedia/archive/03589/Wellcome_Image_Awa_3589699k.jpg" />
</image>
</ImageView>
<HBox spacing="100.0" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0">
<children>
<Button fx:id="button1" mnemonicParsing="false" onAction="#button1Press" prefHeight="45.0" prefWidth="1000.0" text="Singleplayer" />
<Button fx:id="button2" mnemonicParsing="false" onAction="#button2Press" prefHeight="45.0" prefWidth="1000.0" text="Multiplayer" />
<Button fx:id="button3" mnemonicParsing="false" onAction="#button3Press" prefHeight="45.0" prefWidth="1000.0" text="Settings" />
<Button fx:id="button4" mnemonicParsing="false" onAction="#button4Press" prefHeight="45.0" prefWidth="1000.0" text="Quit" />
</children>
<padding>
<Insets bottom="30.0" left="100.0" right="100.0" top="20.0" />
</padding>
</HBox>
<Region fx:id="region" prefHeight="15.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0" />
</children>
</fx:root>
Solution (solved by James_D)
I added
.root {
-fx-background-color: transparent;
}
to the external style sheet and added stylesheets="#application.css" to the root node in the FXML file.

The default CSS style sheet for JavaFX, modena, applies a non-transparent color to the background of the root node. That's the color you're seeing when you display your main view.
The reason you don't see this in your first screen, or if you remove the buttons from the main screen, is that the default style sheet is only loaded the first time the Control class (or one of its subclasses) is instantiated. This is done to avoid the overhead of CSS processing for applications not needing it.
To fix, either add style="-fx-background-color: transparent;" to the root node in the FXML file, or add the rule
.root {
-fx-background-color: transparent ;
}
to the external style sheet.

SubScene in JavaFX does not show elements loaded from an FXML file

I have a program created with an FXML file (made in SceneBuilder) that has four SubScenes in it:
#FXML
public SubScene p1sub;
#FXML
public SubScene p2sub;
#FXML
public SubScene p3sub;
#FXML
public SubScene p4sub;
Each of these subscenes is nearly identical to the rest.
I can get the root node (which contains these) to show up just fine, but when I try to add the SubScenes, they don't show up.
//This is the code I use to initialize one of the four.
Parent root2a = null;
try {
FXMLLoader loader2 = new FXMLLoader(getClass().getResource(
"PlayerConfigurationSubScreen.fxml"));
root2a = (Parent) loader2.load();
} catch (Exception e) {
/*code*/
}
/*code*/
if (root2a != null) {
System.out.println("root2 isn't null");
p1sub = new SubScene(root2a, 149, 260);
}
/*code*/
stage.show();
Any idea how to make them show up? I'm new at JavaFX.

Set the subscene dimensions in fxml and instead of "new" just add the parent to the subscene.
....
p1sub.setRoot(root2a);
....

I think you are approaching the problem the wrong way. From what I understand from your code, you want to load a subscene and then assign it to one of your predefined "slots".
This however will not work, as the pre-defined slots has nothing to do with what is actually rendered. Everything that is drawn in a window has to be assigned as child of a container of some kind.
I've made an example here that reproduces the problem you are facing:
public class ReplaceTest extends Application {
#FXML Button button;
#FXML Label oldLabel;
#Override
public void start(Stage primaryStage) throws IOException{
Parent root = FXMLLoader.load( getClass().getResource("ReplaceTest.fxml") );
Scene scene = new Scene(root);
primaryStage.setScene(scene);
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
private static int i = 0;
#FXML protected void simpleClick(ActionEvent e){
Label newLabel = new Label("Hello! " + i++);
oldLabel = newLabel;
System.out.println("Nothing happens...");
}
}
And the FXML file
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.geometry.*?>
<?import javafx.scene.control.*?>
<?import java.lang.*?>
<?import javafx.scene.layout.*?>
<?import javafx.scene.layout.AnchorPane?>
<VBox alignment="TOP_CENTER" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="100.0" prefWidth="200.0" spacing="10.0" xmlns="http://javafx.com/javafx/8.0.40" xmlns:fx="http://javafx.com/fxml/1" fx:controller="replaceTest.ReplaceTest">
<children>
<Label fx:id="oldLabel" text="TEXT TO BE REPLACED" />
<Button fx:id="button" onAction="#simpleClick" text="Replace label" />
</children>
<padding>
<Insets top="10.0" />
</padding>
</VBox>
If you try this example, you will see that overwriting oldLabel does not affect the rendering window. Instead, you can try to create areas to which you add your new subscenes as children. This will update the rendering window and will (hopefully) produce the behavior you desire. Again, I've made an example you can consult:
public class ReplaceTest extends Application {
#FXML Button button;
#FXML VBox wrappingBox;
#Override
public void start(Stage primaryStage) throws IOException{
Parent root = FXMLLoader.load( getClass().getResource("ReplaceTest.fxml") );
Scene scene = new Scene(root);
primaryStage.setScene(scene);
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
private static int i = 0;
#FXML protected void simpleClick(ActionEvent e){
Label newLabel = new Label("Hello! " + i++);
wrappingBox.getChildren().clear();
wrappingBox.getChildren().add(newLabel);
System.out.println("Someting happens!");
}
}
And the FXML
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.geometry.*?>
<?import javafx.scene.control.*?>
<?import java.lang.*?>
<?import javafx.scene.layout.*?>
<?import javafx.scene.layout.AnchorPane?>
<VBox alignment="TOP_CENTER" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="100.0" prefWidth="200.0" spacing="10.0" xmlns="http://javafx.com/javafx/8.0.40" xmlns:fx="http://javafx.com/fxml/1" fx:controller="replaceTest.ReplaceTest">
<children>
<VBox fx:id="wrappingBox" alignment="TOP_CENTER">
<children>
<Label text="TEXT TO BE REPLACED" />
</children>
</VBox>
<Button fx:id="button" onAction="#simpleClick" text="Replace label" />
</children>
<padding>
<Insets top="10.0" />
</padding>
</VBox>

Primary stage changes scene size

I have designed a simple scene with a few buttons in scene builder. Nothing special on that:
I've put that on the primary stage and it looks ok to me:
But now, if i change the resizable attribute of the primary stage to false, the scene is growing on the right and on the bottom:
Why is the scene growing on the right and bottom? In my oppionion there is nothing special on it:
#Override
public void start(Stage stage) throws Exception {
AnchorPane root = FXMLLoader.load(getClass().getResource("/fxml/start.fxml"));
Scene scene = new Scene(root);
stage.setResizable(false);
stage.setTitle("Game");
stage.setScene(scene);
stage.centerOnScreen();
stage.show();
}
The FXML:
<?xml version="1.0" encoding="UTF-8"?>
<?import java.lang.*?>
<?import java.net.*?>
<?import java.util.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>
<?import javafx.scene.paint.*?>
<AnchorPane fx:id="rootPane" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="310.0" prefWidth="320.0" xmlns:fx="http://javafx.com/fxml" fx:controller="bla.bla.bla.Controller">
<children>
<Button fx:id="btnNewGame" layoutX="10.0" layoutY="10.0" mnemonicParsing="false" prefHeight="50.0" prefWidth="300.0" text="New Game" />
<Button fx:id="btnLoadGame" layoutX="10.0" layoutY="70.0" mnemonicParsing="false" prefHeight="50.0" prefWidth="300.0" text="Load Game" />
<Button fx:id="btnEditor" layoutX="10.0" layoutY="130.0" mnemonicParsing="false" prefHeight="50.0" prefWidth="300.0" text="Editor" />
<Button fx:id="btnProperties" layoutX="10.0" layoutY="190.0" mnemonicParsing="false" prefHeight="50.0" prefWidth="300.0" text="Properties" />
<Button fx:id="btnExit" layoutX="10.0" layoutY="250.0" mnemonicParsing="false" prefHeight="50.0" prefWidth="300.0" text="Exit" />
</children>
<stylesheets>
<URL value="#start.css" />
</stylesheets>
</AnchorPane>
And the css:
#rootPane{
-fx-background-color: #333333;
}
.button{
-fx-background-color: #555555;
-fx-text-fill: silver;
-fx-background-radius: 0;
-fx-border-radius: 0;
-fx-border-color: #444444;
}
Thanks in advance!

My test program looks like this:
#Override
public void start(final Stage stage) throws Exception {
StackPane root = FXMLLoader.load(getClass().getResource("stage.fxml"));
final Scene scene = new Scene(root);
scene.widthProperty().addListener(new ChangeListener<Number>() {
#Override
public void changed(ObservableValue<? extends Number> observableValue, Number number, Number number2) {
System.out.println("width: "+number+" -> "+number2);
}
});
boolean resizable = true;
stage.setResizable(resizable);
stage.setTitle("Stage Resizable "+ resizable);
stage.setScene(scene);
stage.centerOnScreen();
stage.show();
}
When the Stage#reziable flag is set to false, for example, setWidth is called twice. With your example fxml, my output is as follows:
width: 0 -> 320
width: 320 -> 330
whereas, when resizable is true, setWidth is only called once:
width: 0 -> 320
I cannot see where the 10 extra pixels are coming from, this has nothing to do with the interior of the scene (I switchted to an empty StackPane for my tests). I assumed that this is a bug in JavaFX, and a quick jira search revealed the following: https://javafx-jira.kenai.com/browse/RT-30647
So, if you want that to be fixed, I suggest you upvote that issue ;)

I'm not familiar with FXML but did you try stage.sizeToScene(); in your start method?
Edit: i'm sorry it doesn't work, and reading Sebastian answers makes it obvious.