Text box like Telegram. Is it possible?

[otopba]

Hi!
I can not figure out how to make so that the text field can expand and shrink to a certain size. Just as it does in the Telegram.
Thank you!

[JordanMartinez]

Something like this might work:

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.stage.Stage;
import org.fxmisc.flowless.VirtualizedScrollPane;
import org.fxmisc.richtext.InlineCssTextArea;

public class AreaHeight extends Application {

    @Override
    public void start(Stage primaryStage) {
        InlineCssTextArea area = new InlineCssTextArea();
        VirtualizedScrollPane<InlineCssTextArea> pane = new VirtualizedScrollPane<>(area);

        area.getParagraphs().sizeProperty().values()
                .map(size -> {
                    int linesToDisplay;
                    if (size > 5) {
                        linesToDisplay = 5;
                    } else if (size == 0) {
                        linesToDisplay = 1;
                    } else {
                        linesToDisplay = size;
                    }

                    double lineHeight = 14;

                    return lineHeight * linesToDisplay;
                })
                .subscribe(pane::setPrefHeight);

        primaryStage.setScene(new Scene(pane, 500, 500));
        primaryStage.show();
    }

}

[otopba]

@JordanMartinez Thank you!
I found another approach

  area.totalHeightEstimateProperty().addListener(new ChangeListener<Double>() {
            @Override
            public void changed(ObservableValue<? extends Double> observable, Double oldValue, Double newValue) {
                if (newValue != null && newValue != 0.0 && newValue < 200.0) {
                    pane.setPrefHeight(newValue);
                }
            }
        });

[JordanMartinez]

@otopba Why not use a lambda instead of a ChangeListener?

[otopba]

@JordanMartinez It's not necessary. I just prefer this way =)

[JordanMartinez]

@otopba Does this resolve your issue? If so, could you close it?

[otopba]

@JordanMartinez Yes. Thank you!