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Monday, 26 December 2016

Chapter 16 Exercise 1, Introduction to Java Programming, Tenth Edition Y. Daniel LiangY.

16.1 (Use radio buttons)
Write a GUI program as shown in Figure 16.36a.
You can use buttons to move the message to the left
and right and use the radio buttons to change the color for
the message displayed.

import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.RadioButton;
import javafx.scene.control.ToggleGroup;
import javafx.scene.image.ImageView;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.HBox;
import javafx.scene.layout.Pane;
import javafx.scene.paint.Color;
import javafx.scene.text.Font;
import javafx.scene.text.Text;
import javafx.stage.Stage;

public class Exercise_01 extends Application {

    @Override
    public void start(Stage primaryStage) throws Exception {

        Text text = new Text(50, 50, "JavaFX");
        text.setFont(Font.font("Arial", 20));

        TextPane pane = new TextPane(text);

        primaryStage.setScene(new Scene(pane));
        primaryStage.setTitle("Text Pane");
        primaryStage.show();
    }

    public static void main(String[] args) {

        Application.launch(args);
    }

    private class TextPane extends BorderPane {

        Text text;

        private TextPane(Text text) {
            this.text = text;
            Pane textPane = new Pane(this.text);
            setCenter(textPane);
            setPrefWidth(400);
            setPrefHeight(200);

            // Create Color Radio Buttons
            String[] strColors = {"Red", "Yellow", "Black", "Orange", "Green"};
            Color[] colors = {Color.RED, Color.YELLOW, Color.BLACK, Color.ORANGE, Color.GREEN};
            RadioButton[] rbColors = new RadioButton[strColors.length];

            HBox colorRbPane = new HBox(10);
            colorRbPane.setAlignment(Pos.CENTER);
            colorRbPane.setPadding(new Insets(1, 10, 1, 10));
            colorRbPane.setStyle("-fx-border-color: green");
            setTop(colorRbPane);

            // Create ToggleGroup to sync radio buttons together
            ToggleGroup colorGroup = new ToggleGroup();

            for (int i = 0; i < rbColors.length; i++) {

                rbColors[i] = new RadioButton(strColors[i]);

                // Add radio buttons to ButtonGroup
                rbColors[i].setToggleGroup(colorGroup);

                final int index = i; // Index inside inside lambda
                rbColors[i].setOnAction(e -> text.setFill(colors[index]));

                colorRbPane.getChildren().add(rbColors[i]); // add radioButton to buttonsPane
            }

            // Create Left and Right arrow buttons
            Button btLeft = new Button("", new ImageView("/image/left.gif"));
            Button btRight = new Button("", new ImageView("/image/right.gif"));

            // Add buttons to hBox pane
            HBox arrowBtPane = new HBox(btLeft, btRight);

            // Set arrowPane to the bottom of border pane
            setBottom(arrowBtPane);
            // Configure arrowPane to properly display in BorderPane
            arrowBtPane.setAlignment(Pos.CENTER);
            arrowBtPane.setPadding(new Insets(1, 10, 1, 10));
            arrowBtPane.setSpacing(10);
            arrowBtPane.setStyle("-fx-border-color: green");

            btLeft.setOnAction(e -> text.setX(text.getX() - 10));
            btRight.setOnAction(e -> text.setX(text.getX() + 10));
        }


    }
}

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