JavaFx ImageView won't resize when binding fitWidthProperty to VBox

I am trying to resize an image so that it fits (scales) in the space allocated SplitPane

(for workarounds: this image will change when the program is run, it must be generated from text). The ImageView I'm using is currently changing location SplitPane

Divider

. The divider can never result in ImageView

reducing the size of the image.

Two images showing this behavior .

Binding ImageView

fitWidthProperty to VBox

didn't give me the resizing behavior I was expecting. Increasing the size ImageView

works (where it's fixed without snapping), but the image never grows, it just gets borders around it.

My MWE:

sample.fxml

:

<?import javafx.scene.control.SplitPane?>
<?import javafx.scene.control.TextArea?>
<?import javafx.scene.image.ImageView?>
<?import javafx.scene.layout.HBox?>
<?import javafx.scene.layout.VBox?>
<SplitPane orientation="HORIZONTAL" xmlns:fx="http://javafx.com/fxml">
    <TextArea fx:id="textArea"/>
    <VBox fx:id="vBox" alignment="CENTER">
        <HBox fx:id="hBox" alignment="CENTER">
            <ImageView fx:id="imageView"/>
        </HBox>
    </VBox>
</SplitPane>

      

Controller.java

:

import javafx.fxml.FXML;
import javafx.scene.control.TextArea;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.HBox;
import javafx.scene.layout.VBox;

public class Controller {
    @FXML
    private TextArea textArea = new TextArea();
    @FXML
    private VBox vBox = new VBox();
    @FXML
    private HBox hBox = new HBox();
    @FXML
    private ImageView imageView = new ImageView();

    public Controller() {
        imageView.fitWidthProperty().bind(vBox.widthProperty());
        imageView.fitHeightProperty().bind(hBox.heightProperty());
    }

    public void start() {
        textArea.setText("text");

        Image image = new Image("https://www.google.nl/images/srpr/logo11w.png");
        imageView.setImage(image);
    }
}

      

and Main.java

:

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(final Stage primaryStage) throws Exception {
        final Controller controller = new Controller();

        FXMLLoader fxmlLoader = new FXMLLoader(getClass().getResource("sample.fxml"));
        fxmlLoader.setController(controller);

        final Parent root = fxmlLoader.load();
        primaryStage.setTitle("MWE");
        final Scene scene = new Scene(root, 640, 480);
        primaryStage.setScene(scene);
        primaryStage.show();

        controller.start();
    }

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

      

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2 answers


You can try binding the ImageView fitWidthProperty()

to the SplitPane splitter position property.

A binding like this should work:



imageView.fitWidthProperty().bind(Bindings.subtract(1, 
               splitPane.getDividers().get(0).positionProperty())
                                      .multiply(splitPane.widthProperty());

      

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this is my sample for you!

<?import javafx.scene.control.SplitPane?>
<?import javafx.scene.image.Image?>
<?import javafx.scene.image.ImageView?>
<?import javafx.scene.layout.StackPane?>
<?import javafx.scene.layout.VBox?>
<StackPane fx:controller="sample.Controller"
       xmlns:fx="http://javafx.com/fxml" alignment="center">

<SplitPane fx:id="splitpane">
    <VBox fx:id="left" prefWidth="300" prefHeight="200" style="-fx-background-color: antiquewhite">
        <ImageView fx:id="image1" preserveRatio="true" pickOnBounds="true">
            <image>
                <Image url="@/sample/test.jpg"/>
            </image>
        </ImageView>
    </VBox>
    <VBox fx:id="right" prefWidth="300" prefHeight="300" style="-fx-background-color: aquamarine">
        <ImageView fx:id="image2" preserveRatio="true" pickOnBounds="true">
            <image>
                <Image url="@/sample/test.jpg"/>
            </image>
        </ImageView>
    </VBox>
</SplitPane>

      



package sample;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.SplitPane;
import javafx.scene.image.ImageView;
import java.net.URL;
import java.util.ResourceBundle;

public class Controller implements Initializable {

    @FXML
    ImageView image1;
    @FXML
    ImageView image2;
    @FXML
    SplitPane splitpane;
    @Override
    public void initialize(URL location, ResourceBundle resources) {
   splitpane.getDividers().get(0).positionProperty().addListener((observable, oldValue, newValue) -> {
        System.out.println(newValue);
        int w = 600;
        double w1 = w * newValue.doubleValue();
        double w2 = w - w1;
        image1.setFitWidth(w1);
        image2.setFitWidth(w2);
    });
   }
}

      

execute result

+1


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