tresf/ResizeBeforeShow.java

## ResizeBeforeShow.java

import javafx.animation.AnimationTimer;
import javafx.application.Application;
import javafx.concurrent.Worker;
import javafx.embed.swing.SwingFXUtils;
import javafx.scene.Scene;
import javafx.scene.web.WebView;
import javafx.stage.Stage;

import javax.imageio.ImageIO;
import java.io.File;

public class ResizeBeforeShow extends Application {
    public static void main(String[] args) {
        launch(args);
    }

    @Override
    public void start(Stage stage) {
        WebView webView = new WebView();
        webView.setPrefSize(100, 0);
        webView.setMinSize(100, 0);
        webView.autosize();
        webView.getEngine().loadContent("<html style='background-color: red;'><h1>test1<br></h1><p>testing<br><br><br><br></p></html>");

        webView.getEngine().getLoadWorker().stateProperty().addListener((ov, oldState, newState) -> {
            if (newState == Worker.State.SUCCEEDED) {
                String height = webView.getEngine().executeScript("Math.max(document.body.offsetHeight, document.body.scrollHeight)").toString();
                Double prefHeight = Double.parseDouble(height);
                System.out.println("Setting height as " + prefHeight);
                webView.setPrefHeight(prefHeight);
                webView.setMinHeight(prefHeight);
                stage.setScene(new Scene(webView));
                stage.show();

                // Snapshot on next pulse to allow render
                new AnimationTimer() {
                    @Override
                    public void handle(long now) {
                        webView.snapshot(param -> {
                            try {
                                File outputfile = new File(System.getProperty("user.home") + "/Desktop/a.png");
                                ImageIO.write(SwingFXUtils.fromFXImage(param.getImage(), null), "png", outputfile);
                            } catch (Throwable t) {
                                t.printStackTrace();
                            }
                            return null;
                        }, null, null);
                    }
                }.start();
            }
        });
    }
}

	import javafx.animation.AnimationTimer;
	import javafx.application.Application;
	import javafx.concurrent.Worker;
	import javafx.embed.swing.SwingFXUtils;
	import javafx.scene.Scene;
	import javafx.scene.web.WebView;
	import javafx.stage.Stage;

	import javax.imageio.ImageIO;
	import java.io.File;

	public class ResizeBeforeShow extends Application {
	public static void main(String[] args) {
	launch(args);
	}

	@Override
	public void start(Stage stage) {
	WebView webView = new WebView();
	webView.setPrefSize(100, 0);
	webView.setMinSize(100, 0);
	webView.autosize();
	webView.getEngine().loadContent("<html style='background-color: red;'><h1>test1<br></h1><p>testing<br><br><br><br></p></html>");

	webView.getEngine().getLoadWorker().stateProperty().addListener((ov, oldState, newState) -> {
	if (newState == Worker.State.SUCCEEDED) {
	String height = webView.getEngine().executeScript("Math.max(document.body.offsetHeight, document.body.scrollHeight)").toString();
	Double prefHeight = Double.parseDouble(height);
	System.out.println("Setting height as " + prefHeight);
	webView.setPrefHeight(prefHeight);
	webView.setMinHeight(prefHeight);
	stage.setScene(new Scene(webView));
	stage.show();

	// Snapshot on next pulse to allow render
	new AnimationTimer() {
	@Override
	public void handle(long now) {
	webView.snapshot(param -> {
	try {
	File outputfile = new File(System.getProperty("user.home") + "/Desktop/a.png");
	ImageIO.write(SwingFXUtils.fromFXImage(param.getImage(), null), "png", outputfile);
	} catch (Throwable t) {
	t.printStackTrace();
	}
	return null;
	}, null, null);
	}
	}.start();
	}
	});
	}
	}