JavaFX | Pos Class

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Pos class is a part of JavaFX. Pos class contains values which state the horizontal and vertical positioning or alignment. Pos class inherits Enum class.

Commonly Used Methods:

Method	Explanation
getHpos()	Returns the horizontal alignment.
getVpos()	Returns the vertical alignment.
valueOf(String n)	Returns the Pos object whose name is the string specified.
values()	Returns an array which contains all the Pos values.

Below programs illustrate the use of Pos Class:

Java Program to create a tilepane and add a specified Pos value as its alignment: In this program we will create a TilePane named tile_pane. Add Label named label and some buttons to the tile_pane. Set the Alignment of the tile_pane using the setAlignment() function. Set the alignment of the tile_pane to the Pos value TOP_LEFT. Add the tile_pane to the scene and add the scene to the stage and call the show() function to display the final results.

// Java Program to create a tilepane and add
// a specified Pos value as its alignment
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.layout.*;
import javafx.stage.Stage;
import javafx.geometry.*;
import javafx.scene.paint.*;
import javafx.scene.canvas.*;
import javafx.scene.text.*;
import javafx.scene.Group;
import javafx.scene.shape.*;
  
public class Pos_1 extends Application {
  
    // launch the application
    public void start(Stage stage)
    {
  
        try {
  
            // set title for the stage
            stage.setTitle("Pos");
  
            // create a label
            Label label = new Label("this is Pos example");
  
            // create a Tile pane
            TilePane tile_pane = new TilePane(label);
  
            // create and add buttons to tilepane
            for (int i = 1; i <= 7; i++) {
                tile_pane.getChildren().add(new Button("Button " + i));
            }
  
            // set Alignment of pane
            tile_pane.setAlignment(Pos.TOP_LEFT);
  
            // create a scene
            Scene scene = new Scene(tile_pane, 400, 300);
  
            // set the scene
            stage.setScene(scene);
  
            stage.show();
        }
  
        catch (Exception e) {
  
            System.out.println(e.getMessage());
        }
    }
  
    // Main Method
    public static void main(String args[])
    {
  
        // launch the application
        launch(args);
    }
}

Output:

Java Program to create a TilePane and a combobox that contains different values of Pos: In this program we will create a TilePane named tile_pane. Add Label named label and some buttons to the tile_pane. Set the Alignment of the tile_pane using the setAlignment() function. We will set the alignment of the tile_pane to the Pos value BASELINE_CENTER. Store all the names of Pos values in a String array. Now create a combobox which will contain the names of Pos values and also cranate a Action Event to handle the combobox events. The Event handler will set the Alignment of the tilepane to the chosen pos value. Now create a VBox and add the tilepane and the combo box to vbox. Finally, add the vbox to the scene and add the scene to the stage and call the show() function to display the final results.

// Java Program to create a TilePane and 
// a combobox that contains different 
// values of Pos
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.layout.*;
import javafx.stage.Stage;
import javafx.geometry.*;
import javafx.scene.paint.*;
import javafx.scene.canvas.*;
import javafx.scene.text.*;
import javafx.scene.Group;
import javafx.scene.shape.*;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.collections.*;
   
public class Pos_2 extends Application {
   
// launch the application
public void start(Stage stage)
{
  
    try {
  
        // set title for the stage
        stage.setTitle("Pos Class");
  
        // create a label
        Label label = new Label("This is Pos Class Example");
  
        // create a Tile pane
        TilePane tile_pane = new TilePane(label);
  
        // create and add buttons to tilepane
        for (int i = 1; i <= 7; i++) {
  
            tile_pane.getChildren().add(new Button("Button " + i));
        }
  
        // set Alignment of pane
        tile_pane.setAlignment(Pos.BASELINE_CENTER);
  
        // pos names
        String pos_name[] = {"BASELINE_CENTER", "BASELINE_LEFT",
                             "BASELINE_RIGHT", "BOTTOM_CENTER", 
                             "BOTTOM_LEFT", "BOTTOM_RIGHT", 
                             "CENTER", "CENTER_LEFT", "CENTER_RIGHT",
                             "TOP_CENTER", "TOP_LEFT", "TOP_RIGHT"};
  
        // Create a combo box
        ComboBox combo_box = 
          new ComboBox(FXCollections.observableArrayList(pos_name));
  
        // Create action event
        EventHandler<ActionEvent> event =
        new EventHandler<ActionEvent>() {
  
            public void handle(ActionEvent e)
            {
  
                // set Alignement of the TilePane
                tile_pane.setAlignment(Pos.valueOf(
                     (String)combo_box.getValue()));
            }
        };
  
        // Set on action
        combo_box.setOnAction(event);
  
        // create a VBox
        VBox vbox = new VBox(30, combo_box, tile_pane);
  
        // set Alignemnet
        vbox.setAlignment(Pos.CENTER);
  
        // create a scene
        Scene scene = new Scene(vbox, 400, 300);
  
        // set the scene
        stage.setScene(scene);
  
        stage.show();
    }
  
    catch (Exception e) {
  
        System.out.println(e.getMessage());
    }
}
  
// Main Method
public static void main(String args[])
{
  
    // launch the application
    launch(args);
}
}