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package mybinding;

import javafx.application.Application;

import javafx.beans.property.SimpleStringProperty;

import javafx.beans.property.StringProperty;

import javafx.event.ActionEvent;

import javafx.event.Event;

import javafx.event.EventHandler;

import javafx.geometry.HPos;

import javafx.geometry.Insets;

import javafx.geometry.Pos;

import javafx.geometry.VPos;

import javafx.scene.Scene;

import javafx.scene.control.Button;

import javafx.scene.control.Hyperlink;

import javafx.scene.control.Label;

import javafx.scene.control.PasswordField;

import javafx.scene.control.TextField;

import javafx.scene.layout.GridPane;

import javafx.stage.Stage;

public class GridPaneSampleBinding extends Application {

    //Declaring a JavaFX property

    private StringProperty message = new SimpleStringProperty();

    public void start(Stage primaryStage) {

        Label userIdLbl = new Label("User ID:");

        TextField userIdTxt = new TextField();

        Label userPwdLbl = new Label("Password:");

        PasswordField userPwdTxt = new PasswordField();

        Button signInBtn = new Button("Sign In");

        Button cancelBtn = new Button("Cancel");

        Hyperlink forgotPwdLink = new Hyperlink("Forgot password");

        // A label to display messages using binding

        Label messageLbl = new Label();

        // binding the StringProperty to a GUI component

        messageLbl.textProperty().bind(message);

        GridPane root = new GridPane();

        root.setVgap(20);

        root.setPadding(new Insets(10));

        root.setAlignment(Pos.CENTER);

        // Using static methods for setting node constraints

        GridPane.setConstraints(userIdLbl, 0, 0);

        GridPane.setConstraints(userIdTxt, 1, 0);

        GridPane.setConstraints(userPwdLbl, 0, 1);

        GridPane.setConstraints(userPwdTxt, 1, 1);

        GridPane.setConstraints(signInBtn, 0, 2);

        //Cancel button: span 1, right aligned

        GridPane.setConstraints(cancelBtn, 1, 2, 1, 1,

                HPos.RIGHT, VPos.CENTER);

        GridPane.setConstraints(forgotPwdLink, 0, 3, 2, 1);

        // Message label: span 2

        GridPane.setConstraints(messageLbl, 0, 4, 2, 1);

        root.getChildren().addAll(userIdLbl, userIdTxt, userPwdLbl,

                userPwdTxt, signInBtn, cancelBtn, forgotPwdLink, messageLbl);

        // event handlers

        //1. Anonymous class

        signInBtn.setOnAction(new EventHandler() {

            @Override

            public void handle(Event event) {

                message.set("Sign in clicked.");

            }

        });

        // lambda expression

        cancelBtn.setOnAction(evt

                -> message.set("Cancel clicked.")

        );

        // method reference

        forgotPwdLink.setOnAction(this::forgotPwdHandler);

        // Show the window

        Scene scene = new Scene(root, 250, 220);

        primaryStage.setScene(scene);

        primaryStage.show();

    }

    private void forgotPwdHandler(ActionEvent evt) {

        message.set("Forgot password clicked");

    }

    public static void main(String[] args) {

        launch(args);

    }

}