Java Fx

• On newer versions of ubuntu, JavaFX is distributed separately from the JDK.

  sudo apt install openjfx
  

• Once you have that installed, you need to specify the runtime modules for OpenJFX by adding these to your command to compile

  --module-path /usr/share/openjfx/lib --add-modules=javafx.base,javafx.controls,javafx.fxml,javafx.graphics,javafx.media,javafx.swing,javafx.web
  

• Your commands to compile and run will now look like

  javac --module-path /usr/share/openjfx/lib --add-modules=javafx.base,javafx.controls,javafx.fxml,javafx.graphics,javafx.media,javafx.swing,javafx.web q1.java
  
  
  java --module-path /usr/share/openjfx/lib --add-modules=javafx.base,javafx.controls,javafx.fxml,javafx.graphics,javafx.media,javafx.swing,javafx.web q1
  

• All JavaFx programs have a class that extends javafx.application.Application

​```java import javafx.application.Application; import javafx.stage.Stage; public class demo extends Application{ public static void main(String args[]){

}
@Override
public void start(Stage primaryStage)throws Exception }   ```

• Every JavaFx application has the following components :

  • Stage
  • Layout
  • Scene
  • Control
  • Events

• Sample Program

  import javafx.application.Application;
  import javafx.stage.Stage;
  import javafx.scene.control.*; //Button
  import javafx.scene.layout.*; // HBox
  import javafx.scene.*; //Scene
    
  public class demo1 extends Application {
      public static void main(String[] args) {
          launch();
      }
    
      @Override
      public void start(Stage primaryStage) throws Exception{
          Button b = new Button("Click Me");
    
          HBox hb = new HBox();
    
          hb.getChildren().add(b);
          Scene s = new Scene(hb);
          primaryStage.setScene(s);
          primaryStage.show();
      }
  }
  

Function Available
primaryStage.show();
primaryStage.setScene(val);
primaryStage.setTitle(val);
primaryStage.getTitle();
primaryStage.setWidth(val);
primaryStage.setHeight(val);
primaryStage.getWidth();
primaryStage.getHeight();
primaryStage.setFullScreen(true);
primaryStage.isFullScreen();
primaryStage.close();

• Layouts

  • Can be flexible layouts or dynamic layouts

  • HBox, VBox, StackPane, FlowPane, GridPane, BorderPane

    • Layout	Description
      HBox	arranges its content nodes horizontally in a single row
      VBox	arranges its content nodes vertically in a single column
      StackPane	places the content nodes in a back-to-front single stack
      FlowPane	arranges its content nodes in either a horizontal or vertical “flow”, wrapping at the specified width or height boundaries
      GridPane	Flexible grid of rows and columns in which to lay out content nodes
      BorderPane	lays out its content nodes in the top, bottom, right, left or centre region

  • ListView

    ListView<String> lv = new ListView<String>();
    lv.getSelectionModel().setSelectionMode(SelectionMode.MULTIPLE);
    lv.getItems().add("English");
    lv.getItems().add("Physics");
    lv.getItems().add("Java");
    lv.getItems().add("DBMS");
    

  • DatePicker

    DatePicker d = new DatePicker();
    

  • Label

    import javafx.scene.control.Label;
    import javafx.scene.paint.Color;
    import javafx.scene.text.TextAlignment;
    
    
    Label l = new Label("test");
    l.setTextFill(Color.RED);
    l.setText("hello");
    l.setWrapText(true);
    l.setFont(new Font("Times New Roman", 32));
    l.setTextAlignment(TextAlignment.CENTER);
    // LEFT, CENTER, RIGHT, JUSTIFY
    
    
    // adding a picture to the label
    FileInputStream fin = new FileInputStream("/path/to/pic");
            Image img = new Image(fin);
            ImageView iv = new ImageView(img);
            Label l = new Label("Hello World", iv);
    

  • Button

    import javafx.scene.control.Button;
    
    Button b = new Button();
    b.setText("Hello World");
    b.setDisable(true);
    b.setWrapText(true);
    

  • Radio Button

    import javafx.scene.control.RadioButton;
    
    ToggleGroup tg = new ToggleGroup();
    
    RadioButton opt1 = new RadioButton("English");
    RadioButton opt2 = new RadioButton("Chemistry");
    RadioButton opt3 = new RadioButton("French");
    
    opt1.setToggleGroup(tg);
    opt2.setToggleGroup(tg);
    opt3.setToggleGroup(tg);
    

  • CheckBox

    import javafx.scene.control.CheckBox;
    
    //same as RadioButton
    

  • HyperLink

    import javafx.scene.control.Hyperlink;
    HyperLink link1 = new HyperLink("http://something.com");
    

• GridPane

    GridPane grid = new GridPane();
    grid.addRow(6, errorLabel);
      
    grid.add(textFieldLabel, 0, 0);
  // component, column, row
      
    grid.setHgap(10);
    grid.setVgap(10);
  

  • ComboBox

    import javafx.scene.control.ComboBox;
        
    ComboBox<String> stuff = new ComboBox<String>();
    stuff.getItems().add("English");
    stuff.getItems().add("Physics");
    

Events in Java

Java has a wide variety of events, most common of which are ActionEvent

import javafx.event.ActionEvent;
import javafx.event.EventHandler;

We define an action event callback as follows :

EventHandler<ActionEvent> event = new EventHandler<ActionEvent>() {

            public void handle(ActionEvent e) {
                System.out.println("Hello World");
            }
        };

We then call our JavaFx object and register this callback

Button btn = new Button("Click Me") ;
btn.setOnAction(event);