[[oktatas:programozás:java:java_fx|< Java FX]]

====== Java FX tananyag ======

  * **Szerző:** Sallai András
  * Copyright (c) Sallai András, 2021, 2022, 2023
  * Licenc: [[https://creativecommons.org/licenses/by-sa/4.0/|CC Attribution-Share Alike 4.0 International]]
  * Web: https://szit.hu

===== Helló Világ =====

Első programunk egy ablakot jelenít meg egy felirattal. Ehhez négy osztályra van szükségünk.


<code java App.java>
import javafx.application.Application;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.layout.StackPane;

public class App extends Application {
    @Override
    public void start(Stage stage) {
        StackPane root = new StackPane();
        Scene scene = new Scene(root, 300, 250);
        stage.setScene(scene);
        stage.setTitle("Helló Világ!");
        stage.show();
    }
}
</code>

A stage egy ablaknak felel meg. A scene azon belül egy konténernek.

Futtatás a bin könyvtárból:

<code>
java --module-path /home/janos/Library/javafx-sdk-16/lib --add-modules javafx.controls,javafx.fxml App
</code>


===== A main() metódus =====

A JavaFX program elfut a main() metódus nélkül is; azért szokták hozzáadni, mert így kezelhetők a parancssori argumentumok is.

<code java App.java>
import javafx.application.Application;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.layout.StackPane;

public class App extends Application {
    @Override
    public void start(Stage stage) {
        StackPane root = new StackPane();
        Scene scene = new Scene(root, 300, 250);
        stage.setScene(scene);
        stage.setTitle("Helló Világ!");
        stage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
}
</code>

{{:oktatas:programozas:java:java_fx:javafx_hellovilag_mainmethod.png|}}

Egyes kódszerkesztők (ilyen a Visual Studio Code is) esetén előfordulhat, hogy 
nem hajlandó futni csak main() metódus megléte esetén.




===== Text =====
A Text osztály szöveg megjelenítésére alkalmas.

<code java App.java>
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.layout.VBox;
import javafx.scene.text.Text;
import javafx.stage.Stage;

public class App extends Application {
    public static void main(String[] args) {
        launch(args);
    }
    
    @Override
    public void start(Stage stage) throws Exception {
        Text text = new Text("Helló");
        Scene scene = new Scene(new VBox(text), 300, 250);
        stage.setScene(scene);
        stage.setTitle("Valami");
        stage.show();
    }
}
</code>

{{:oktatas:programozas:java:java_fx:javafx_text_control.png|}}

==== Szöveg elhelyezése ====

<code java App.java>
import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.text.Text;
import javafx.stage.Stage;
 
public class App extends Application {
    public static void main(String[] args) {
        launch(args);
    }
 
    @Override
    public void start(Stage stage) throws Exception {
        Text text = new Text();
        text.setText("Helló Világ");
        text.setX(150);
        text.setY(150);
        Group root = new Group(text);
        Scene scene = new Scene(root, 300, 250);
        stage.setScene(scene);
        stage.setTitle("Valami");
        stage.show();
    }
}
</code>

{{:oktatas:programozas:java:java_fx:javafx_text_control_position.png|}}

===== Label =====
A Label osztály szöveg és mellette egy kép megjelenítésére alkalmas.
<code java App.java>
import javafx.application.Application;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.control.Label;
 
public class App extends Application {
    @Override
    public void start(Stage stage) {
        Label label = new Label("Helló");
        Scene scene = new Scene(label, 300, 250);
        stage.setScene(scene);
        stage.setTitle("Valami");
        stage.show();
    }
 
    public static void main(String[] args) {
        launch(args);
    }
}
</code>




Fontbeállítás:
<code java>
import javafx.scene.text.Font;

...

label.setFont(new Font("Arial", 24));
</code>


{{:oktatas:programozas:java:java_fx:javafx_label_control_setfont.png|}}

Szövegbeállítás:
<code java>
label.setText("Új szöveg");
</code>

Kép beállítása szöveg mellé:
<code java>
...
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;

...

String iconPath = "resources/images/icon01.png";
FileInputStream input = new FileInputStream(iconPath);
Image image = new Image(input);
ImageView imageView = new ImageView(image);
Label label = new Label("Helló", imageView);
</code>

A fájlbeolvasást tegyük a ''label'' objektum létrehozása elé.


{{:oktatas:programozas:java:java_fx:javafx_label_control_plus_image.png|}}

<code>
app01/
  |-.vscode/
  |   |-launch.json
  |   `-settings.json
  |-bin/
  |-lib/
  |-resouces/
  |   `-images/
  |       `-kep01.png
  |-src/
  |  `-App.java
  `-README.md
</code>


Szöveg igazítása:
<code java>
label1.setAligment(Pos.CENTER);
</code>

Ügyeljünk a label1 szélességére. Tegyük egy konténerben, amiben a mérete teljes szélességű.


Abszolút pozíciónálás:

<code java>
    public void start(Stage stage) throws Exception {
        
        Pane pane = new Pane();
        Label label1 = new Label("Első");
        Label label2 = new Label("Második");
        label1.setLayoutX(50);
        label1.setLayoutY(50);
        label2.setLayoutX(50);
        label2.setLayoutY(70);
        pane.getChildren().addAll(label1, label2);        
        Scene scene = new Scene(pane, 400, 300);
        stage.setScene(scene);
        stage.show();
    }
</code>


===== Nyomógomb =====

Importáljuk a gombot:

<code java>
import javafx.scene.control.Button;
</code>

Példányosítjuk a start() metódusban, majd adjuk a panelhez:

<code java>
Button button = new Button("Katt");
//...
root.getChildren().add(button);
</code>

A teljes kód:

<code java App.java>
import javafx.application.Application;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.StackPane;
 
public class App extends Application {
 
    public static void main(String[] args) {
        launch(args);
    }

    @Override
    public void start(Stage stage) {
        Button button = new Button("Mehet");
        
        StackPane root = new StackPane();
        root.getChildren().add(button);
        Scene scene = new Scene(root, 300, 250);
        stage.setScene(scene);
        stage.setTitle("Valami");
        stage.show();
    }

}
</code>


{{:oktatas:programozas:java:java_fx:javafx_button_control.png|}}
===== Nyomógomb eseménye =====

Szükségünk van két új osztályra:
<code java>
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
</code>

Adjunk a gombhoz eseménykezelést:

<code java>
        button.setOnAction(new EventHandler<ActionEvent>() {
            @Override
            public void handle(ActionEvent event) {
                System.out.println("Kattintás volt");
            }
        });
</code>


A teljes kód:

<code java App.java>
import javafx.application.Application;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.layout.StackPane;
import javafx.scene.control.Button;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;

public class App extends Application {
    @Override
    public void start(Stage stage) {
        Button button = new Button("Katt");
        button.setOnAction(new EventHandler<ActionEvent>() {
            @Override
            public void handle(ActionEvent event) {
                System.out.println("Kattintás volt");
            }
        });

        StackPane root = new StackPane();
        root.getChildren().add(button);
        Scene scene = new Scene(root, 300, 250);
        stage.setScene(scene);
        stage.setTitle("Valami");
        stage.show();
    }

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

</code>

Kilépés programból:
  stage.close();

Eseménykezelés lambda kifejezéssel a [[oktatas:programozas:java:java_fx:tananyag#gomb_lambda_esemenykezelessel|függelékben]].


===== ToggleButton =====

<code java>
import javafx.scene.control.ToggleButton;
...

ToggleButton toggleButton1 = new ToggleButton("Mehet");
...
</code>

A lenyomott állapot ellenőrzése:
<code java>
boolean lenyomva = toggleButton1.isSelected();

</code>

Teljes kód:

<code java App.java>
import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.control.ToggleButton;
import javafx.scene.layout.VBox;
 
public class App extends Application {
 
    public static void main(String[] args) {
        launch(args);
    }
 
    @Override
    public void start(Stage primaryStage) {
        ToggleButton toggleButton1 = new ToggleButton("Fent");
        ToggleButton toggleButton2 = new ToggleButton("Lenyomva");
        VBox vbox = new VBox();
        vbox.setPadding(new Insets(10, 10, 10, 10));
        vbox.setSpacing(10);
 
        vbox.getChildren().add(toggleButton1);
        vbox.getChildren().add(toggleButton2);
        Scene scene = new Scene(vbox, 300, 250);
        primaryStage.setScene(scene);
        primaryStage.setTitle("Valami");
        primaryStage.show();
    }
}
</code>

{{:oktatas:programozas:java:java_fx:two_togglebutton.png|}}

===== Elrendezés =====

Függőleges elrendezéshez használjuk a VBox osztályt:
<code java>
VBox vbox = new VBox();
vbox.getChildren().addAll(label, button);
</code>

Vízszintes elrendezéshez HBox osztály használahtó.


<code java>
import javafx.application.Application;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.layout.VBox;
import javafx.scene.control.Button;
import javafx.scene.control.Label;

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

    @Override
    public void start(Stage primaryStage) {
        Label label = new Label("Felirat");
        Button button = new Button("Gomb");
        VBox vbox = new VBox();
        vbox.getChildren().addAll(label, button);
        Scene scene = new Scene(vbox, 300, 250);
        primaryStage.setScene(scene);
        primaryStage.show();
    }
}

</code>

{{:oktatas:programozas:java:java_fx:javafx_layout_vbox01.png|}}

20 pixel a komponensek között:
<code java>
VBox vbox = new VBox(20);
</code>



==== Két gomb függőlegesen ====


<code java App.java>

import javafx.application.Application;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.StackPane;
import javafx.scene.layout.VBox;

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

    @Override
    public void start(Stage stage) {
        
        Button button1 = new Button("Mehet");
        Button button2 = new Button("Mehet");
        button1.setOnAction(e -> onButton1Click());
        button2.setOnAction(e -> onButton2Click());
        
        StackPane root = new StackPane();
        VBox vbox = new VBox(10);
        vbox.getChildren().addAll(button1, button2);
        root.getChildren().add(vbox);
        Scene scene = new Scene(root, 300, 250);
        stage.setScene(scene);
        stage.setTitle("Valami");
        stage.show();
    }

    private void onButton1Click() {
        System.out.println("1-s gomb kattintás");
    }
    private void onButton2Click() {
        System.out.println("2-s gomb kattintás");
    }

}
</code>

{{:oktatas:programozas:java:java_fx:javafx_layout_vbox.png|}}
===== Scene csere =====

<code java App.java>
import javafx.application.Application;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.layout.VBox;
import javafx.scene.control.Button;
import javafx.scene.control.Label;

public class App extends Application {
    Stage primaryStage;

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

    @Override
    public void start(Stage primaryStage) {
        this.primaryStage = primaryStage;

        Label label1 = new Label("Első");
        Button button1 = new Button("Másik");
        VBox vbox1 = new VBox();
        vbox1.getChildren().addAll(label1, button1);
        Scene scene1 = new Scene(vbox1, 300, 250);

        Label label2 = new Label("Második");
        Button button2 = new Button("Vissza");
        VBox vbox2 = new VBox();
        vbox2.getChildren().addAll(label2, button2);
        Scene scene2 = new Scene(vbox2, 300, 250);

        button1.setOnAction(e -> primaryStage.setScene(scene2));
        button2.setOnAction(e -> primaryStage.setScene(scene1));

        primaryStage.setScene(scene1);
        primaryStage.show();
    }
}
</code>

===== Párbeszédablak =====

<code java App.java>
import javafx.application.Application;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.layout.VBox;
import javafx.scene.control.Button;
import javafx.scene.control.Label;

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

    @Override
    public void start(Stage primaryStage) {
        Label label1 = new Label("Első");
        Button button1 = new Button("Másik");
        VBox vbox1 = new VBox();
        vbox1.getChildren().addAll(label1, button1);
        Scene scene1 = new Scene(vbox1, 300, 250);

        button1.setOnAction(e -> MsgBox.show("cím", "Valami"));

        primaryStage.setScene(scene1);
        primaryStage.show();
    }
}

</code>


<code java MsgBox.java>
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.layout.VBox;
import javafx.stage.Modality;
import javafx.stage.Stage;

public class MsgBox {
    public static void show(String title, String msg) {
        Stage stage = new Stage();
        stage.initModality(Modality.APPLICATION_MODAL);
        stage.setTitle(title);

        Label label = new Label(msg);
        Button button = new Button("Bezár");
        button.setOnAction(e -> stage.close());
        VBox vbox = new VBox();
        vbox.getChildren().addAll(label, button);
        vbox.setAlignment(Pos.CENTER);

        Scene scene = new Scene(vbox, 300, 250);
        stage.setScene(scene);
        stage.show();
    }
}

</code>

{{:oktatas:programozas:java:java_fx:javafx_messagebox.png|}}
===== Dialógus ablak =====

Szükségünk van a showAndWait(); metódusra, mert máskülönben a System.out.println()
nem várja meg az ablak bezárását.




<code java App.java>
import javafx.application.Application;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.StackPane;

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

    @Override
    public void start(Stage primaryStage) throws Exception {
        Button goButton = new Button("Mehet");
        goButton.setOnAction(e -> {
            boolean result = DlgBox.show("cím", "Biztos?");
            System.out.println("válasz: " + result);
        });
        StackPane root = new StackPane();
        root.getChildren().add(goButton);
        Scene scene1 = new Scene(root, 300, 250);
        primaryStage.setScene(scene1);
        primaryStage.show();
    }

}

</code>




<code java DlgBox.java>
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.layout.HBox;
import javafx.scene.layout.VBox;
import javafx.stage.Modality;
import javafx.stage.Stage;

public class DlgBox {
    static boolean result;

    public static boolean show(String title, String msg) {
        Stage stage = new Stage();
        stage.initModality(Modality.APPLICATION_MODAL);
        stage.setTitle(title);

        Label label = new Label(msg);
        Button yesButton = new Button("Igen");
        Button noButton = new Button("Nem");

        yesButton.setOnAction(e -> {
            result = true;
            stage.close();
        });
        noButton.setOnAction(e -> {
            result = false;
            stage.close();
        });
        VBox vbox = new VBox();
        HBox hbox = new HBox(10);
        vbox.getChildren().addAll(label, hbox);
        vbox.setAlignment(Pos.CENTER);
        hbox.getChildren().addAll(yesButton, noButton);
        hbox.setAlignment(Pos.CENTER);

        Scene scene = new Scene(vbox, 300, 250);
        stage.setScene(scene);
        stage.showAndWait();

        return result;
    }
}

</code>

{{:oktatas:programozas:java:java_fx:javafx_dialogbox.png|}}


===== Üzenetdoboz =====


<code java>
import javafx.scene.control.Alert;
...

Alert alert = new Alert(Alert.AlertType.INFORMATION);        
alert.setTitle("Címsor szöveg");
alert.setHeaderText("Fejrész szöveg");
alert.setContentText("Üzenet");
alert.showAndWait();
</code>


Teljes kód:

<code java App.java>
import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Alert;
import javafx.scene.layout.VBox;
 
public class App extends Application {
    public static void main(String[] args) {
        launch(args);
    }
 
    @Override
    public void start(Stage primaryStage) throws Exception {
        Button showButton = new Button("Mutat");
        Alert alert = new Alert(Alert.AlertType.INFORMATION);        
        showButton.setOnAction(e -> {
            alert.setTitle("Címsor szöveg");
            alert.setHeaderText("Fejrész szöveg");
            alert.setContentText("Üzenet");
            alert.showAndWait();
        });
 
        VBox vbox = new VBox();
        vbox.setPadding(new Insets(10, 10, 10, 10));
        vbox.setSpacing(10);
        vbox.getChildren().add(showButton);
 
        Scene scene = new Scene(vbox, 300, 250);
        primaryStage.setScene(scene);
 
        primaryStage.show();
    }
 
}
</code>



{{:oktatas:programozas:java:java_fx:alert_message.png|}}
===== Beviteli =====

Bevitelhez a TextField osztály használjuk.

<code java App.java>
import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.TextField;
import javafx.scene.layout.VBox;

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

    @Override
    public void start(Stage primaryStage) throws Exception {
        TextField numInput = new TextField();
        Button doubleButton = new Button("Dupla");
        doubleButton.setOnAction(e -> {
            String numStr = numInput.getText();
            int num = Integer.parseInt(numStr);
            Integer result = num * 2;
            numInput.setText(result.toString());
        });

        VBox vbox = new VBox();
        vbox.setPadding(new Insets(10, 10, 10, 10));
        vbox.getChildren().addAll(numInput, doubleButton);

        Scene scene = new Scene(vbox, 300, 250);
        primaryStage.setScene(scene);

        primaryStage.show();
    }

}

</code>

{{:oktatas:programozas:java:java_fx:javafx_textfield_control.png|}}
===== Jelszó =====


Jelszóbevitel
<code java>
...
import javafx.scene.control.PasswordField;

...

PasswordField passInput = new PasswordField();
passInput.setPromptText("password");
</code>


A következő program egy felhasználónevet és jelszót kér be. 

Teljes kód:

<code java App.java>
import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.TextField;
import javafx.scene.control.PasswordField;
import javafx.scene.control.Alert;
import javafx.scene.layout.VBox;
 
public class App extends Application {
    public static void main(String[] args) {
        launch(args);
    }
 
    @Override
    public void start(Stage primaryStage) throws Exception {
        TextField userInput = new TextField();
        PasswordField passInput = new PasswordField();
        passInput.setPromptText("jelszó");
        Button loginButton = new Button("Belépés");
        Alert alert = new Alert(Alert.AlertType.INFORMATION);        
        loginButton.setOnAction(e -> {
            String user = userInput.getText();
            String pass = passInput.getText();
            System.out.printf("|%s|\n",user);
            System.out.printf("|%s|\n", pass);
            String msgStr = "";
            if(user.equals("janos") && pass.equals("titok")) {
                msgStr = "Azonosítás OK";
            }else {
                msgStr = "Hiba! Azonosítás sikertelen!";
            }
            alert.setContentText(msgStr);
            alert.showAndWait();
        });
 
        VBox vbox = new VBox();
        vbox.setPadding(new Insets(10, 10, 10, 10));
        vbox.setSpacing(10);
        
        vbox.getChildren().add(userInput);
        vbox.getChildren().add(passInput);
        vbox.getChildren().add(loginButton);
 
        Scene scene = new Scene(vbox, 300, 250);
        primaryStage.setScene(scene);
 
        primaryStage.show();
    }
 
}
</code>

{{:oktatas:programozas:java:java_fx:user_pass_input.png|}}

  * https://docs.oracle.com/javafx/2/ui_controls/password-field.htm



===== Rádiógomb =====

<code java>
import javafx.scene.control.RadioButton;
...

RadioButton rb1 = new RadioButton();
rb1.setText("Valami");
</code>

Esetleg így:
<code java>
RadioButton rb1 = new RadioButton("Valami");
</code>


Csoportosítás:
<code java>
final ToggleGroup group1 = new ToggleGroup();        
RadioButton radio1 = new RadioButton("Emese");
RadioButton radio2 = new RadioButton("Béla");

radio1.setToggleGroup(group1);
radio2.setToggleGroup(group1);
</code>


A kiválasztott gomb vizsgálata:
<code java>
System.out.println(radio1.isSelected() );
</code>


Teljes kód:

<code java App.java>
import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.RadioButton;
import javafx.scene.control.ToggleGroup;
import javafx.scene.layout.VBox;
 
public class App extends Application {
    public static void main(String[] args) {
        launch(args);
    }
 
    @Override
    public void start(Stage primaryStage) throws Exception {
        final ToggleGroup group1 = new ToggleGroup();        
        RadioButton radio1 = new RadioButton("Emese");
        RadioButton radio2 = new RadioButton("Béla");
        Button button1 = new Button("Választ");
        
        radio1.setToggleGroup(group1);
        radio2.setToggleGroup(group1);        
        
        button1.setOnAction(e -> {
            String valasztott = "";
            if(radio1.isSelected()) {
                valasztott = "Emese";
            }else {
                valasztott = "Béla";
            }
            System.out.println("Választott: " + valasztott);
        });
 
        VBox vbox = new VBox(10);
        vbox.setPadding(new Insets(10, 10, 10, 10));
        vbox.getChildren().addAll(radio1, radio2, button1);
 
        Scene scene = new Scene(vbox, 300, 250);
        primaryStage.setScene(scene);
 
        primaryStage.show();
    }
 
}
</code>


{{:oktatas:programozas:java:java_fx:radiobutton_example.png|}}


Link:
  * https://docs.oracle.com/javafx/2/ui_controls/radio-button.htm (2022)
===== Jelőlönézet =====


<code java App.java>
import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.CheckBox;
import javafx.scene.layout.VBox;

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

    @Override
    public void start(Stage primaryStage) throws Exception {
        CheckBox checkbox1 = new CheckBox("Emese");
        CheckBox checkbox2 = new CheckBox("Béla");
        Button button = new Button("Dupla");

        checkbox1.setSelected(true);
        button.setOnAction(e -> {
            if (checkbox1.isSelected()) {
                System.out.println("Emese ok");
            }
            if (checkbox2.isSelected()) {
                System.out.println("Béla ok");
            }
        });

        VBox vbox = new VBox(10);
        vbox.setPadding(new Insets(10, 10, 10, 10));
        vbox.getChildren().addAll(checkbox1, checkbox2, button);

        Scene scene = new Scene(vbox, 300, 250);
        primaryStage.setScene(scene);

        primaryStage.show();
    }

}

</code>

{{:oktatas:programozas:java:java_fx:javafx_checkbox_control.png|}}
===== ChoiceBox =====

<code java App.java>
import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.ChoiceBox;
import javafx.scene.layout.VBox;

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

    @Override
    public void start(Stage primaryStage) throws Exception {
        ChoiceBox<String> choicebox = new ChoiceBox<>();

        choicebox.setValue("Szilva");
        choicebox.getItems().add("szilva");
        choicebox.getItems().add("körte");
        choicebox.getItems().add("barack");
        choicebox.getItems().addAll("alma", "banán", "citrom");

        Button button = new Button("Mehet");
        button.setOnAction(e -> {
            System.out.println(choicebox.getValue());
        });

        VBox vbox = new VBox(10);
        vbox.setPadding(new Insets(10, 10, 10, 10));
        vbox.getChildren().addAll(choicebox, button);

        Scene scene = new Scene(vbox, 300, 250);
        primaryStage.setScene(scene);

        primaryStage.show();
    }

}

</code>

{{:oktatas:programozas:java:java_fx:javafx_choicebox_control.png|}}


A szelekció változásának figyelése:
<code java>
        choicebox.getSelectionModel().selectedItemProperty()
                .addListener((obj, oldValue, newValue) -> System.out.println(newValue));
</code>

===== ComboBox =====

<code java App.java>
import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.ComboBox;
import javafx.scene.layout.VBox;

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

    @Override
    public void start(Stage primaryStage) throws Exception {
        ComboBox<String> combobox = new ComboBox<>();

        combobox.getItems().add("alma");
        combobox.getItems().add("körte");
        combobox.getItems().add("barack");
        combobox.getItems().addAll("szilva", "banán", "citrom");
        combobox.setValue("barack");

        Button button = new Button("Mehet");
        button.setOnAction(e -> {
            System.out.println(combobox.getValue());
        });

        VBox vbox = new VBox(10);
        vbox.setPadding(new Insets(10, 10, 10, 10));
        vbox.getChildren().addAll(combobox, button);

        Scene scene = new Scene(vbox, 300, 250);
        primaryStage.setScene(scene);

        primaryStage.show();
    }

}

</code>

{{:oktatas:programozas:java:java_fx:javafx_combobox_control.png|}}

Beállíthatunk olyan szöveget is, ami előzetesen megjelenik, de nem jelent kiválasztást:
<code java>
//combobox.setValue("barack");
combobox.setPromptText("Válassz gyümölcsöt");
</code>
Ebben az esetben törölni kell a setValue() beállítást.

Változás figyelése:
<code java>
combobox.setOnAction(e -> System.out.println("Valami ki lett választva"));
</code>

Szerkeszthetőség beállítása:
<code java>
combobox.setEditable(true);
</code>


===== ListBox =====

<code java App.java>
import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.ListView;
import javafx.scene.layout.VBox;

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

    @Override
    public void start(Stage primaryStage) throws Exception {
        ListView<String> list = new ListView<>();
        list.getItems().setAll("alma", "körte", "barack", "szilva");

        Button button = new Button("Mehet");
        button.setOnAction(e -> {
            System.out.println(list.getSelectionModel().getSelectedIndex());
            System.out.println(list.getSelectionModel().getSelectedItem());
        });

        VBox vbox = new VBox(10);
        vbox.setPadding(new Insets(10, 10, 10, 10));
        vbox.getChildren().addAll(list, button);

        Scene scene = new Scene(vbox, 300, 250);
        primaryStage.setScene(scene);

        primaryStage.show();
    }

}

</code>

{{:oktatas:programozas:java:java_fx:javafx_listview_control_oneline.png|}}


Többsoros kijelölés:

<code java App.java>
import javafx.application.Application;
import javafx.collections.ObservableList;
import javafx.geometry.Insets;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.ListView;
import javafx.scene.control.SelectionMode;
import javafx.scene.layout.VBox;

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

    @Override
    public void start(Stage primaryStage) throws Exception {
        ListView<String> list = new ListView<>();
        list.getItems().setAll("alma", "körte", "barack", "szilva");

        list.getSelectionModel().setSelectionMode(SelectionMode.MULTIPLE);

        Button button = new Button("Mehet");
        button.setOnAction(e -> {
            ObservableList<String> obsList;
            obsList = list.getSelectionModel().getSelectedItems();
            for (String item : obsList) {
                System.out.println(item);
            }
        });

        VBox vbox = new VBox(10);
        vbox.setPadding(new Insets(10, 10, 10, 10));
        vbox.getChildren().addAll(list, button);

        Scene scene = new Scene(vbox, 300, 250);
        primaryStage.setScene(scene);

        primaryStage.show();
    }

}

</code>

{{:oktatas:programozas:java:java_fx:javafx_listview_control_multiline.png|}}
===== TreeView =====


<code java App.java>
import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.TreeItem;
import javafx.scene.control.TreeView;
import javafx.scene.layout.VBox;

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

    @Override
    public void start(Stage primaryStage) throws Exception {
        TreeView<String> tree;
        TreeItem<String> rootNode, progNode, databaseNode;

        rootNode = new TreeItem<>("Tanulnivaló");

        progNode = createNode("Programozás", rootNode);
        createNode("Java", progNode);
        createNode("Charp", progNode);

        databaseNode = createNode("Adatbázis", rootNode);
        createNode("MySQL", databaseNode);
        createNode("Mariadb", databaseNode);

        tree = new TreeView<>(rootNode);

        Button button = new Button("Vált");
        button.setOnAction(e -> {
            if (tree.isShowRoot())
                tree.setShowRoot(false);
            else
                tree.setShowRoot(true);
        });

        VBox vbox = new VBox(10);
        vbox.setPadding(new Insets(10, 10, 10, 10));
        vbox.getChildren().addAll(tree, button);

        Scene scene = new Scene(vbox, 300, 250);
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    public TreeItem<String> createNode(String title, TreeItem<String> parent) {
        TreeItem<String> node = new TreeItem<>(title);
        parent.getChildren().add(node);
        return node;
    }

}

</code>

{{:oktatas:programozas:java:java_fx:javafx_tree_control.png|}}

A csomópont nyitása, zárása a setExpanded() metódussal lehetséges.
<code java>
root.setExpanded(true);
</code>

A csomópont nyitva, vagy zárva van-e:
<code java>
root.isExpanded()
</code>

Melyik elem lett kijelölve:
<code java>
tree.getSelectionModel().selectedItemProperty().addListener((obj, odlNode, newNode) -> {
    if (newNode != null) {
        System.out.println(newNode.getValue());
    }
});
</code>

Még több:
  * https://docs.oracle.com/javase/8/javafx/user-interface-tutorial/tree-view.htm

===== Táblázat =====
==== Megjelenítés táblázatban ====

A táblázathoz a következő osztályok szükségesek:
  * TableView
  * TableColumn
  * PropertyValueFactory
  * ObservableList
  * FXCollections

Szükség van egy olyan osztályra, amiben tárolhatjuk a táblázat sorait. Legyen a példa kedvéért egy dolgozókat tároló osztály:

<code java Employee.java>
public class Employee {
    String name;
    String city;
    double salary;

    public Employee(String name, String city, double salary) {
        this.name = name;
        this.city = city;
        this.salary = salary;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getCity() {
        return city;
    }

    public void setCity(String city) {
        this.city = city;
    }

    public double getSalary() {
        return salary;
    }

    public void setSalary(double salary) {
        this.salary = salary;
    }   

}

</code>

Szükségünk lesz, minden mező számára beállító és lekérdező (getter, setter) függvényekre.


<code java App.java>
import javafx.application.Application;
import javafx.collections.ObservableList;
import javafx.scene.Scene;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.stage.Stage;
import javafx.collections.FXCollections;

public class App extends Application {

    private final TableView<Employee> table = new TableView<>();

    public static void main(String[] args) {
        launch(args);
    }
    
    @Override
    public void start(Stage primaryStage) throws Exception {

        TableColumn<Employee, String> nameCol = new TableColumn<>("Név");
        nameCol.setMinWidth(100);
        nameCol.setCellValueFactory(new PropertyValueFactory<>("name"));

        TableColumn<Employee, String> cityCol = new TableColumn<>("Település");
        cityCol.setMinWidth(100);
        cityCol.setCellValueFactory(new PropertyValueFactory<>("city"));

        TableColumn<Employee, Double> salaryCol = new TableColumn<>("Fizetés");
        salaryCol.setMinWidth(100);
        salaryCol.setCellValueFactory(new PropertyValueFactory<>("salary"));

        table.setItems(getEmployees());

        table.getColumns().add(nameCol);
        table.getColumns().add(cityCol);
        table.getColumns().add(salaryCol);

        Scene scene = new Scene(table, 302, 250);
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    private ObservableList<Employee> getEmployees() {

        ObservableList<Employee> employees = 
        FXCollections.observableArrayList(
                new Employee("Poros Béla", "Szeged", 2870000), 
                new Employee("Tér Irén", "Szeged", 2435000),
                new Employee("Pakos Péter", "Hatvan", 2530000), 
                new Employee("Szu Emese", "Szolnok", 2270000));
        return employees;
    }

}
</code>

{{:oktatas:programozas:java:java_fx:javafx_table_control_1.png|}}

A táblázat mezőit a table.getColumns().addAll() függvénnyel is felvehetjük, de ez típusbiztonsági figyelmeztetést eredményez, mivel ismétlődő típusok argumentumlistáját adjuk át.

Több kijelölhető sor beállítása:
<code java>
table.getSelectionModel().setSelectionMode(
    SelectionMode.MULTIPLE
    ); 
</code>


==== Táblázat sorkezeléssel ====

<code java Employee.java>
public class Employee {
    String name;
    String city;
    Double salary;

    public Employee(String name, String city, double salary) {
        this.name = name;
        this.city = city;
        this.salary = salary;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getCity() {
        return city;
    }

    public void setCity(String city) {
        this.city = city;
    }

    public Double getSalary() {
        return salary;
    }

    public void setSalary(Double salary) {
        this.salary = salary;
    }
 
}

</code>

<code java App.java>
import javafx.application.Application;
import javafx.collections.ObservableList;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.TextField;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.scene.layout.HBox;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
import javafx.collections.FXCollections;

public class App extends Application {

    private TableView<Employee> table = new TableView<>();
    private TextField nameInput, cityInput, salaryInput;

    public static void main(String[] args) {
        launch(args);
    }
    
    @Override
    public void start(Stage primaryStage) throws Exception {

        TableColumn<Employee, String> nameCol = new TableColumn<>("Név");
        nameCol.setMinWidth(100);
        nameCol.setCellValueFactory(new PropertyValueFactory<>("name"));

        TableColumn<Employee, String> cityCol = new TableColumn<>("Település");
        cityCol.setMinWidth(100);
        cityCol.setCellValueFactory(new PropertyValueFactory<>("city"));


        TableColumn<Employee, String> salaryCol = new TableColumn<>("Fizetés");
        salaryCol.setMinWidth(100);
        salaryCol.setCellValueFactory(new PropertyValueFactory<>("salary"));

        

        nameInput = new TextField();
        nameInput.setPromptText("Név");

        cityInput = new TextField();
        cityInput.setPromptText("Település");

        salaryInput = new TextField();
        salaryInput.setPromptText("Fizetés");


        Button addButton = new Button("Hozzáad");
        addButton.setOnAction(e->onClickAddButton());
        Button delButton = new Button("Törlés");
        delButton.setOnAction(e->onClickDelButton());

        HBox inputBox = new HBox(10);
        inputBox.setPadding(new Insets(10, 10, 10, 10));
        inputBox.setSpacing(10);
        inputBox.getChildren().addAll(
            nameInput, cityInput, salaryInput
        );
        HBox buttonBox = new HBox(10);
        buttonBox.setPadding(new Insets(10, 10, 10, 10));
        buttonBox.setSpacing(10);
        buttonBox.getChildren().addAll(
            addButton, delButton
        );

        
        VBox vbox = new VBox();
        vbox.getChildren().addAll(table, inputBox, buttonBox);

        table.setItems(getEmployees());

        table.getColumns().add(nameCol);
        table.getColumns().add(cityCol);
        table.getColumns().add(salaryCol);

        Scene scene = new Scene(vbox, 302, 250);
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    private void onClickAddButton() {
        String name = this.nameInput.getText();
        String city = this.cityInput.getText();
        double salary = Double.parseDouble(this.salaryInput.getText());
        Employee employee = new Employee(name, city, salary);
        table.getItems().add(employee);
        this.nameInput.clear();
        this.cityInput.clear();
        this.salaryInput.clear();
    }

    private void onClickDelButton() {
        ObservableList<Employee> selectedEmployee, employees;
        employees = table.getItems();
        selectedEmployee = table.getSelectionModel().getSelectedItems();
        selectedEmployee.forEach(employees::remove);
    }

    private ObservableList<Employee> getEmployees() {

        ObservableList<Employee> employees = 
        FXCollections.observableArrayList(
                new Employee("Poros Béla", "Szeged", 2870000), 
                new Employee("Tér Irén", "Szeged", 2435000),
                new Employee("Pakos Péter", "Hatvan", 2530000), 
                new Employee("Szu Emese", "Szolnok", 2270000));
        return employees;
    }

}

</code>

{{:oktatas:programozas:java:java_fx:javafx_table_control.png|}}
==== Szerkeszthető cellák ====

Az Employee osztályban a salary mezőt beállító, lekérdező metódusokat átírtuk.
A lekérő String típust ad vissza, a beállító String típust fogad, de átalakítja Double típussá.

<code java Employee.java>
public class Employee {
    String name;
    String city;
    Double salary;

    public Employee(String name, String city, double salary) {
        this.name = name;
        this.city = city;
        this.salary = salary;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getCity() {
        return city;
    }

    public void setCity(String city) {
        this.city = city;
    }

    public String getSalary() {
        return salary.toString();
    }

    public void setSalary(String salary) {
        this.salary = Double.parseDouble(salary);
    }
 
}

</code>

<code java App.java>
import javafx.application.Application;
import javafx.collections.ObservableList;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.TextField;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.scene.layout.HBox;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
import javafx.collections.FXCollections;
import javafx.event.EventHandler;
import javafx.scene.control.TableColumn.CellEditEvent;
import javafx.scene.control.cell.TextFieldTableCell;

public class App extends Application {

    private TableView<Employee> table = new TableView<>();
    private TextField nameInput, cityInput, salaryInput;

    public static void main(String[] args) {
        launch(args);
    }
    
    @Override
    public void start(Stage primaryStage) throws Exception {

        TableColumn<Employee, String> nameCol = new TableColumn<>("Név");
        nameCol.setMinWidth(100);
        nameCol.setCellValueFactory(new PropertyValueFactory<>("name"));

        TableColumn<Employee, String> cityCol = new TableColumn<>("Település");
        cityCol.setMinWidth(100);
        cityCol.setCellValueFactory(new PropertyValueFactory<>("city"));


        TableColumn<Employee, String> salaryCol = new TableColumn<>("Fizetés");
        salaryCol.setMinWidth(100);
        salaryCol.setCellValueFactory(new PropertyValueFactory<>("salary"));


        nameCol.setCellFactory(
            TextFieldTableCell.<Employee>forTableColumn()    
        );

        cityCol.setCellFactory(
            TextFieldTableCell.<Employee>forTableColumn()    
        );

        salaryCol.setCellFactory(
            TextFieldTableCell.<Employee>forTableColumn()    
        );

        nameCol.setOnEditCommit(
            new EventHandler<CellEditEvent<Employee, String>>() {
                @Override
                public void handle(CellEditEvent<Employee, String> t) {
                    ((Employee) t.getTableView().getItems().get(
                        t.getTablePosition().getRow())
                        ).setName(t.getNewValue());
                }
            }
        );

        cityCol.setOnEditCommit(
            new EventHandler<CellEditEvent<Employee, String>>() {
                @Override
                public void handle(CellEditEvent<Employee, String> t) {
                    ((Employee) t.getTableView().getItems().get(
                        t.getTablePosition().getRow())
                        ).setCity(t.getNewValue());
                }
            }
        );

        salaryCol.setOnEditCommit(
            new EventHandler<CellEditEvent<Employee, String>>() {
                @Override
                public void handle(CellEditEvent<Employee, String> t) {
                    ((Employee) t.getTableView().getItems().get(
                        t.getTablePosition().getRow())
                        ).setSalary(t.getNewValue());
                }
            }
        );

        table.setEditable(true);

        nameInput = new TextField();
        nameInput.setPromptText("Név");

        cityInput = new TextField();
        cityInput.setPromptText("Település");

        salaryInput = new TextField();
        salaryInput.setPromptText("Fizetés");


        Button addButton = new Button("Hozzáad");
        addButton.setOnAction(e->onClickAddButton());
        Button delButton = new Button("Törlés");
        delButton.setOnAction(e->onClickDelButton());

        HBox inputBox = new HBox(10);
        inputBox.setPadding(new Insets(10, 10, 10, 10));
        inputBox.setSpacing(10);
        inputBox.getChildren().addAll(
            nameInput, cityInput, salaryInput
        );
        HBox buttonBox = new HBox(10);
        buttonBox.setPadding(new Insets(10, 10, 10, 10));
        buttonBox.setSpacing(10);
        buttonBox.getChildren().addAll(
            addButton, delButton
        );

        
        VBox vbox = new VBox();
        vbox.getChildren().addAll(table, inputBox, buttonBox);

        table.setItems(getEmployees());

        table.getColumns().add(nameCol);
        table.getColumns().add(cityCol);
        table.getColumns().add(salaryCol);

        Scene scene = new Scene(vbox, 302, 250);
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    private void onClickAddButton() {
        String name = this.nameInput.getText();
        String city = this.cityInput.getText();
        double salary = Double.parseDouble(this.salaryInput.getText());
        Employee employee = new Employee(name, city, salary);
        table.getItems().add(employee);
        this.nameInput.clear();
        this.cityInput.clear();
        this.salaryInput.clear();
    }

    private void onClickDelButton() {
        ObservableList<Employee> selectedEmployee, employees;
        employees = table.getItems();
        selectedEmployee = table.getSelectionModel().getSelectedItems();
        selectedEmployee.forEach(employees::remove);
    }

    private ObservableList<Employee> getEmployees() {

        ObservableList<Employee> employees = 
        FXCollections.observableArrayList(
                new Employee("Poros Béla", "Szeged", 2870000), 
                new Employee("Tér Irén", "Szeged", 2435000),
                new Employee("Pakos Péter", "Hatvan", 2530000), 
                new Employee("Szu Emese", "Szolnok", 2270000));
        return employees;
    }

}

</code>

{{:oktatas:programozas:java:java_fx:javafx_editable_table.png|}}

===== GridPane =====

<code java App.java>
import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
import javafx.scene.layout.GridPane;

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

    @Override
    public void start(Stage primaryStage) throws Exception {
        GridPane grid = new GridPane();
        grid.setVgap(10);
        grid.setHgap(10);
        grid.setPadding(new Insets(10, 10, 10, 10));

        Label baseLabel = new Label("Alap: ");
        GridPane.setConstraints(baseLabel, 0, 0);

        TextField baseInput = new TextField();
        GridPane.setConstraints(baseInput, 1, 0);

        Label heightLabel = new Label("Magasság: ");
        GridPane.setConstraints(heightLabel, 0, 1);

        TextField heightInput = new TextField();
        GridPane.setConstraints(heightInput, 1, 1);

        Button calcButton = new Button("Számít");
        GridPane.setConstraints(calcButton, 1, 2);

        grid.getChildren().addAll(baseLabel, baseInput, heightLabel, heightInput, calcButton);

        Scene scene = new Scene(grid, 300, 150);
        primaryStage.setScene(scene);

        primaryStage.show();
    }

}

</code>

{{:oktatas:programozas:java:java_fx:javafx_gridpane_example.png|}}

===== Menü =====
==== Menükészítés ====

<code java App.java>
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Menu;
import javafx.scene.control.MenuBar;
import javafx.scene.control.MenuItem;
import javafx.scene.layout.BorderPane;
import javafx.stage.Stage;

public class App extends Application {
    public static void main(String[] args) {
        launch(args);
    }
    
    @Override
    public void start(Stage primaryStage) throws Exception {
        Menu fileMenu = new Menu("Segítség");
        fileMenu.getItems().add(new MenuItem("Tartalom"));
        fileMenu.getItems().add(new MenuItem("Névjegy"));

        MenuBar menuBar = new MenuBar();
        menuBar.getMenus().addAll(fileMenu);

        BorderPane borderPane = new BorderPane();
        borderPane.setTop(menuBar);
        Scene scene = new Scene(borderPane, 300, 250);
        primaryStage.setScene(scene);
        primaryStage.show();
    }
}

</code>

{{:oktatas:programozas:java:java_fx:javafx_menu_01.png|}}
==== Menü eseménykezeléssel ====

<code java App.java>
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Menu;
import javafx.scene.control.MenuBar;
import javafx.scene.control.MenuItem;
import javafx.scene.layout.BorderPane;
import javafx.stage.Stage;

public class App extends Application {
    public static void main(String[] args) {
        launch(args);
    }
    
    @Override
    public void start(Stage primaryStage) throws Exception {
        MenuBar menuBar = new MenuBar();
        Menu helpMenu = new Menu("Segítség");
        MenuItem contentMenuItem = new MenuItem("Tartalom");
        MenuItem aboutMenuItem = new MenuItem("Névjegy");

        contentMenuItem.setOnAction(e->System.out.println("Tartalom"));
        aboutMenuItem.setOnAction(e->System.out.println("Névjegy"));

        helpMenu.getItems().addAll(contentMenuItem, aboutMenuItem);
        menuBar.getMenus().addAll(helpMenu);

        BorderPane borderPane = new BorderPane();
        borderPane.setTop(menuBar);
        Scene scene = new Scene(borderPane, 300, 250);
        primaryStage.setScene(scene);
        primaryStage.show();
    }
}
</code>

==== Még több menü ====

<code java App.java>
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Menu;
import javafx.scene.control.MenuBar;
import javafx.scene.control.MenuItem;
import javafx.scene.layout.BorderPane;
import javafx.stage.Stage;

public class App extends Application {
    public static void main(String[] args) {
        launch(args);
    }
    
    @Override
    public void start(Stage primaryStage) throws Exception {
        MenuBar menuBar = new MenuBar();
        Menu fileMenu = new Menu("Fájl");
        Menu helpMenu = new Menu("Segítség");
        MenuItem exitMenuItem = new MenuItem("Kilépés");
        MenuItem contentMenuItem = new MenuItem("Tartalom");
        MenuItem aboutMenuItem = new MenuItem("Névjegy");

        exitMenuItem.setOnAction(e->primaryStage.close());
        contentMenuItem.setOnAction(e->System.out.println("Tartalom"));
        aboutMenuItem.setOnAction(e->System.out.println("Névjegy"));

        fileMenu.getItems().addAll(exitMenuItem);
        helpMenu.getItems().addAll(contentMenuItem, aboutMenuItem);
        menuBar.getMenus().addAll(fileMenu, helpMenu);

        BorderPane borderPane = new BorderPane();
        borderPane.setTop(menuBar);
        Scene scene = new Scene(borderPane, 300, 250);
        primaryStage.setScene(scene);
        primaryStage.show();
    }
}
</code>

===== TabPane =====

<code java>
TabPane tabPane = new TabPane();
Tab tab1 = new Tab("Nevek");
Tab tab2 = new Tab("Csoportok");
Tab tab3 = new Tab("Tárgyak");

tabPane.getTabs().add(tab1);
tabPane.getTabs().add(tab2);
tabPane.getTabs().add(tab3);
</code>


A fülek felirata és tartalma beállítható metódussal:
<code java>
tab1.setText("Valami");
tab1.setContent(vbox1);
</code>

Fülek a panelhez egyetlen metódussal:
<code java>
tabPane.getTabs().addAll(tab1, tab2);
</code>



Teljes kód:

<code java App.java>
import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.control.Tab;
import javafx.scene.control.TabPane;
import javafx.scene.layout.VBox;
 
public class App extends Application {
 
    public static void main(String[] args) {
        launch(args);
    }
 
    @Override
    public void start(Stage primaryStage) {
        TabPane tabPane = new TabPane();
        Tab tab1 = new Tab("Nevek");
        Tab tab2 = new Tab("Csoportok");
        Tab tab3 = new Tab("Tárgyak");

        tabPane.getTabs().add(tab1);
        tabPane.getTabs().add(tab2);
        tabPane.getTabs().add(tab3);

        VBox vbox = new VBox(tabPane);
        vbox.setPadding(new Insets(10, 10, 10, 10));
        vbox.setSpacing(10);

        Scene scene = new Scene(vbox, 300, 250);
        primaryStage.setScene(scene);
        primaryStage.setTitle("Valami");
        primaryStage.show();
    }
}

</code>

{{:oktatas:programozas:java:java_fx:tabpane_example1.png|}}


==== Feliratok ====

<code java>
TabPane tabPane = new TabPane();
Tab tab1 = new Tab("Nevek", new Label("Nevek megjelenítése"));
Tab tab2 = new Tab("Csoportok", new Label("Csoportok megjelenítése"));
Tab tab3 = new Tab("Tárgyak", new Label("Tárgyak megjelenítése"));

tabPane.getTabs().add(tab1);
tabPane.getTabs().add(tab2);
tabPane.getTabs().add(tab3);
</code>

{{:oktatas:programozas:java:java_fx:tabpane_example2.png|}}

==== Gombok a fülön ====

A füleken (tab) elhelyezhető elrendezéskezelő is.
Ebben a példában az első fülön egy VBox elrendezéskezelőn
két gombot helyeztünk el:

<code java App.java>
import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.Tab;
import javafx.scene.control.TabPane;
import javafx.scene.layout.VBox;
 
public class App extends Application {
 
    public static void main(String[] args) {
        launch(args);
    }
 
    @Override
    public void start(Stage primaryStage) {
        Button tab1Button1 = new Button("Mehet");
        Button tab1Button2 = new Button("Jöhet");

        VBox tab1Vbox = new VBox();
        tab1Vbox.setPadding(new Insets(10, 10, 10, 10));
        tab1Vbox.setSpacing(10);
        tab1Vbox.getChildren().add(tab1Button1);
        tab1Vbox.getChildren().add(tab1Button2);

        TabPane tabPane = new TabPane();
        Tab tab1 = new Tab("Nevek", tab1Vbox);
        Tab tab2 = new Tab("Csoportok", new Label("Csoportok megjelenítése"));
        Tab tab3 = new Tab("Tárgyak", new Label("Tárgyak megjelenítése"));

        tabPane.getTabs().add(tab1);
        tabPane.getTabs().add(tab2);
        tabPane.getTabs().add(tab3);

        VBox vbox = new VBox(tabPane);
        vbox.setPadding(new Insets(10, 10, 10, 10));
        vbox.setSpacing(10);

        Scene scene = new Scene(vbox, 300, 250);
        primaryStage.setScene(scene);
        primaryStage.setTitle("Valami");
        primaryStage.show();
    }
}
</code>

{{:oktatas:programozas:java:java_fx:tabpane_example3.png|}}

===== Hibás feladatok =====

==== Két gomb ====

A következő program két gombot jelenít meg.
Az felső gomb kattintásra ki kellene írja: "1-s gomb kattintás".
Az alsó gomb kattintásra ki kellene írja: "2-s gomb kattintás".
Azonban a felső gombra kattintásnál ezt írj ki: "2-s gomb kattintás".
Az alsó gombra kattintva nem történik semmi.
Hol a hiba?

<code java App.java>

import javafx.application.Application;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.StackPane;
import javafx.scene.layout.VBox;

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

    @Override
    public void start(Stage stage) {
        
        Button button1 = new Button("Felső");
        Button button2 = new Button("Alsó");
        button1.setOnAction(e -> onButton1Click());
        button1.setOnAction(e -> onButton2Click());
        
        StackPane root = new StackPane();
        VBox vbox = new VBox(10);
        vbox.getChildren().addAll(button1, button2);
        root.getChildren().add(vbox);
        Scene scene = new Scene(root, 300, 250);
        stage.setScene(scene);
        stage.setTitle("Valami");
        stage.show();
    }

    private void onButton1Click() {
        System.out.println("1-s gomb kattintás");
    }
    private void onButton2Click() {
        System.out.println("2-s gomb kattintás");
    }

}
</code>



===== Függelék =====

==== Label képpel ====

Teljes kód:
<code java App.java>

import java.io.FileInputStream;
import java.io.FileNotFoundException;

import javafx.application.Application;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.text.Font;
 
public class App extends Application {
 
    public static void main(String[] args) {
        launch(args);
    }
    private ImageView getImage() {
        ImageView imageView = null;
        try {
            imageView = tryGetImage();
        } catch (Exception e) {
            System.err.println("Hiba! A fájl nem található");
        }
        return imageView;
    }

    private ImageView tryGetImage() throws FileNotFoundException{
        String iconPath = "resources/images/kep02.png";
        FileInputStream input = new FileInputStream(iconPath);
        Image image = new Image(input);
        ImageView imageView = new ImageView(image);
        return imageView;
    }

    @Override
    public void start(Stage stage) {
        Label label = new Label("Helló", getImage());
        label.setFont(new Font("Arial", 24));
        Scene scene = new Scene(label, 300, 250);
        stage.setScene(scene);
        stage.setTitle("Valami");
        stage.show();
    }

}
</code>


A fájlbetöltése itt átkerült külön metódusba.

==== Gomb lambda eseménykezeléssel ====

<code java App.java>

import javafx.application.Application;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.StackPane;

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

    @Override
    public void start(Stage stage) {
        Button button = new Button("Mehet");
        button.setOnAction(e -> onButtonClick());
        
        StackPane root = new StackPane();
        root.getChildren().add(button);
        Scene scene = new Scene(root, 300, 250);
        stage.setScene(scene);
        stage.setTitle("Valami");
        stage.show();
    }

    private void onButtonClick() {
        System.out.println("Kattintás volt");
    }

}
</code>

===== Linkek =====
  * https://openjfx.io/ (2023)
    * https://openjfx.io/javadoc/19/javafx.controls/javafx/scene/control/Alert.html (2022)
  * https://docs.oracle.com/javafx/2/ (2023)
  * https://controlsfx.github.io/ (2023)
    * http://fxexperience.com/controlsfx/features/ (2023)

Tutorial:
  * https://jenkov.com/tutorials/javafx/index.html (2022)


TableBox:
  * https://docs.oracle.com/javase/8/javafx/user-interface-tutorial/table-view.htm (2021)
  * https://docs.oracle.com/javafx/2/ui_controls/table-view.htm (2021)
  * https://dzone.com/articles/editable-tables-in-javafx (2021)
  * http://tutorials.jenkov.com/javafx/tableview.html (2021)