JaavFX CheckBox

JavaFX Control: CheckBox

§  a special type of button

§  Interactive control – allows user to select or deselect a choice

§  Allows multiple choices to be selected

§  Check Box supports three states – checked, unchecked and indeterminate (also called undefined).

§  Check Box defines two constructors.

o   default constructor.

o   Constructor with a string that identifies the box.

                             CheckBox(String str)

§  Check Box generates an action event when it is clicked.

§  Create action event handler on a Check Box by calling setOnAction( )

§  Obtain the state of a check box by calling isSelected( ).

     final boolean isSelected( )

 

// JavaFX controls

// CheckBox

 

import java.io.*;

import java.net.*;

import javafx.application.*;

import javafx.scene.*;

import javafx.stage.*;

import javafx.scene.layout.*;

import javafx.scene.control.*;

import javafx.event.*;

import javafx.geometry.*;

import javafx.scene.image.*;

import javafx.event.ActionEvent;

import javafx.event.EventHandler;

import javafx.scene.control.Label;

import javafx.stage.Stage;

 

public class JfxChkBox extends Application

{  

     public static void main(String[] args)

     {

          // Start the JavaFX application by calling launch().

          launch(args);

     }

     // Override the start() method.

     public void start(Stage myStage)

     {

          // Give the stage a title.

          myStage.setTitle("JavaFx controls - CheckBox");

 

          // Use a FlowPane for the root node.

          FlowPane fp = new FlowPane(Orientation.VERTICAL, 20,20);

 

          // Center the controls in the scene.

          fp.setAlignment(Pos.CENTER);

 

          // Create a scene.

          Scene myScene = new Scene(fp, 400, 200);

 

          // Set the scene on the stage.

          myStage.setScene(myScene);

 

          // Creating a heading

          Label heading = new Label("Checkbox Demo");

 

          // Create Three checkbox.

          CheckBox CB1, CB2, CB3;

         

          CB1 = new CheckBox("Selected");

          CB2 = new CheckBox("Unselected");

          CB3 = new CheckBox("Indeterminate");

         

          CB1.setSelected(true);

          CB2.setSelected(false);

          CB3.setIndeterminate(true);

         

          // Add to the scene graph.

          fp.getChildren().addAll(heading, CB1, CB2, CB3);

         

          // Show the stage and its scene.

          myStage.show();

     }

}

// JavaFX controls

// CheckBox and Event handling

 

import javafx.application.*;

import javafx.scene.*;

import javafx.stage.*;

import javafx.event.*;

import javafx.scene.layout.*;

import javafx.scene.control.*;

import javafx.geometry.*;

 

public class JfxCBoxEH extends Application

{

   CheckBox CB1, CB2, CB3;

   Label heading, respText;

  

   public static void main(String[] args)

   {

        // Start the JavaFX application by calling launch().

        launch(args);

   }

 

   // Override the start() method.

   public void start(Stage myStage)

   {

        // Give the stage a title.

        myStage.setTitle("JavaFx controls - CheckBox and event handling");

 

        // Use a FlowPane for the root node.

        FlowPane fp = new FlowPane(Orientation.VERTICAL, 20,20);

 

        // Center the controls in the scene.

        fp.setAlignment(Pos.CENTER_LEFT);

        fp.setPadding(new Insets(0,0,0,35));

 

        // Create a scene.

        Scene myScene = new Scene(fp, 400, 200);

 

        // Set the scene on the stage.

        myStage.setScene(myScene);

 

        // Creating a heading and response text

        heading = new Label("Checkbox and Event Handling Demo");

        respText = new Label("No Device selected.");

 

        // Create Three checkbox.

        CB1 = new CheckBox("Mouse");

        CB2 = new CheckBox("Keyboard");

        CB3 = new CheckBox("Touch Screen");

       

        // Add to the scene graph.

        fp.getChildren().addAll(heading, CB1, CB2, CB3, respText);

       

        CB1.setOnAction(new EventHandler<ActionEvent>(){

             public void handle(ActionEvent ae)

             {  

                 fnDisplay();

             }

        } ) ;

       

        CB2.setOnAction(new EventHandler<ActionEvent>(){

             public void handle(ActionEvent ae)

             {  

                 fnDisplay();

             }

        } ) ;

       

        CB3.setOnAction(new EventHandler<ActionEvent>(){

             public void handle(ActionEvent ae)

             {  

                 fnDisplay();

             }

        } ) ;

            

        // Show the stage and its scene.

        myStage.show();

   }

  

 

 

        void fnDisplay()

        {

             String s = "Selected devices : ";

            

             if(CB1.isSelected())

                 s = s+"Mouse ";

             if(CB2.isSelected())

                 s = s+"Keyboard ";

             if(CB3.isSelected())

                 s = s+"Touch Screen ";

            

             if(s.equals("Selected devices : "))

                 s = s+"None.";

            

             respText.setText(s);

        }

}