import com.sun.javafx.runtime.VersionInfo;
import javafx.application.Application;
import javafx.application.Platform;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.layout.HBox;
import javafx.scene.layout.Pane;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.scene.shape.Line;
import javafx.scene.shape.Rectangle;
import javafx.stage.Stage;


public class ScrollPaneApp extends Application {

    private ScrollPane scrollPane;
    private Slider prefViewPortWidth;
    private Slider prefViewPortHeight;

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

    @Override
    public void start(Stage stage) throws Exception {
        stage.setTitle(VersionInfo.getRuntimeVersion());
        stage.setScene(createScene());
        stage.show();
    }

    Scene createScene() {
        HBox root = new HBox();
        scrollPane = new ScrollPane();
        scrollPane.setContent(createCustomContent(200, 200));

        prefViewPortWidth = new Slider();
        prefViewPortWidth.setMin(100);
        prefViewPortWidth.setMax(500);
        prefViewPortWidth.setShowTickLabels(true);

        prefViewPortHeight = new Slider();
        prefViewPortHeight.setMin(100);
        prefViewPortHeight.setMax(500);
        prefViewPortHeight.setShowTickLabels(true);

        CheckBox fitToWidth = new CheckBox("Fit to width (UNIDIR)");
        fitToWidth.setSelected(scrollPane.isFitToWidth());
        fitToWidth.selectedProperty().addListener(new ChangeListener<Boolean>() {
            @Override
            public void changed(ObservableValue<? extends Boolean> observableValue, Boolean oldValue, Boolean value) {
                scrollPane.setFitToWidth(value);
                if (value) {
                    scrollPane.prefViewportWidthProperty().bind(prefViewPortWidth.valueProperty());
                } else {
                    scrollPane.prefViewportWidthProperty().unbind();
                }
            }
        });

        CheckBox fitToHeight = new CheckBox("Fit to height (UNIDIR)");
        fitToHeight.setSelected(scrollPane.isFitToHeight());
        fitToHeight.selectedProperty().addListener(new ChangeListener<Boolean>() {
            @Override
            public void changed(ObservableValue<? extends Boolean> observableValue, Boolean oldValue, Boolean value) {
                scrollPane.setFitToHeight(value);
                if (value) {
                    scrollPane.prefViewportHeightProperty().bind(prefViewPortHeight.valueProperty());
                } else {
                    scrollPane.prefViewportHeightProperty().unbind();
                }
            }
        });

        ToggleButton bidirFitToHeight = new ToggleButton("Fit to height (BIDIR)");
        bidirFitToHeight.selectedProperty().addListener(new ChangeListener<Boolean>() {
            @Override
            public void changed(ObservableValue<? extends Boolean> observableValue, Boolean oldValue, Boolean value) {
                scrollPane.setFitToHeight(value);
                if (value) {
                    scrollPane.prefViewportHeightProperty().bindBidirectional(prefViewPortHeight.valueProperty());
                } else {
                    scrollPane.prefViewportHeightProperty().unbindBidirectional(prefViewPortHeight.valueProperty());
                }
            }
        });

        ToggleButton bidirFitToWidth = new ToggleButton("Fit to width (BIDIR)");
        bidirFitToWidth.selectedProperty().addListener(new ChangeListener<Boolean>() {
            @Override
            public void changed(ObservableValue<? extends Boolean> observableValue, Boolean oldValue, Boolean value) {
                scrollPane.setFitToWidth(value);
                if (value) {
                    scrollPane.prefViewportWidthProperty().bindBidirectional(prefViewPortWidth.valueProperty());
                } else {
                    scrollPane.prefViewportWidthProperty().unbindBidirectional(prefViewPortWidth.valueProperty());
                }
            }
        });

        Button content = new Button("Change content");
        content.setOnAction(new EventHandler<ActionEvent>() {
            @Override
            public void handle(ActionEvent actionEvent) {
                Pane canvas = new Pane();
                canvas.setStyle("-fx-background-color: blue;");
                canvas.setPrefHeight(100);
                canvas.setPrefWidth(100);
                scrollPane.setContent(canvas);
            }
        });

        Pane pane = new Pane();
        pane.setPrefSize(600, 600);
        pane.getChildren().add(scrollPane);

        root.getChildren().add(pane);
        root.getChildren().add(new VBox(new HBox(5, bidirFitToHeight, fitToHeight, new Label("Pref viewport height"), prefViewPortHeight),
                                        new HBox(5, bidirFitToWidth, fitToWidth, new Label("Pref viewport width"),prefViewPortWidth),
                                        content));

        return new Scene(root, 1200, 800);
    }

    static Group createCustomContent(int height, int width) {
        Group res = new Group();

        Rectangle r = new Rectangle();
        r.setStroke(Color.BLACK);
        r.setStyle("-fx-border-color: GREEN;");

        res.getChildren().add(r);

        for (int i = 10; i < height; i += 10) {
            Line line1 = new Line(0, i, i - 5, i);
            Line line2 = new Line(i, 0, i, i - 5);
            Line line3 = new Line(i - 5, i, i - 5, height);
            Line line4 = new Line(i, i - 5, width, i - 5);

            line1.setStroke(Color.RED);
            line2.setStroke(Color.YELLOW);
            line3.setStroke(Color.BLUE);
            line4.setStroke(Color.MAGENTA);

            res.getChildren().addAll(line1, line2, line3, line4);
        }

        Rectangle rec = new Rectangle(0, 0, width, height);
        rec.setFill(Color.TRANSPARENT);
        rec.setStroke(Color.RED);

        res.getChildren().add(rec);

        return res;
    }
}