randomly displaying circles within gridPane cells in javaFX

randomly displaying circles within gridPane cells in javaFX

By : Rehan Julaha
Date : October 23 2020, 08:10 AM
Hope this helps Here is an example that demos how to shuffle Circles around in a GridPane. If you add the Circles to an ArrayList, you can remove the Circles from the GridPane. Then you can shuffle the List. Finally, you can add the shuffled list back to the GridPane.
code :
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Random;
import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Control;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.StackPane;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.scene.shape.Circle;
import javafx.stage.Stage;

 * @author blj0011
public class JavaFXApplication314 extends Application

    Random random = new Random();
    int numberOfRows = 25;
    int numberOfColumns = 25;

    public void start(Stage primaryStage)
        List<Circle> circles = new ArrayList();
        for (int i = 0; i < numberOfColumns * numberOfRows; i++) {
            circles.add(new Circle(10, getRandomColor()));

        GridPane gridPane = new GridPane();
        addCirclesToGridPane(gridPane, circles);
        gridPane.setPadding(new Insets(20, 20, 20, 20));

        Button btn = new Button();
        btn.setText("Say 'Hello World'");
        btn.setOnAction((ActionEvent event) -> {
            Collections.shuffle(circles);//Shuffle the List of Circles.
            for(int i = 0; i < numberOfColumns * numberOfRows; i++) 
                Circle c = circles.get(i); 
                GridPane.setColumnIndex(c, i % numberOfColumns); 
                GridPane.setRowIndex(c, i / numberOfColumns); 

        VBox vBox = new VBox(gridPane, new StackPane(btn));
        vBox.setMaxSize(Control.USE_COMPUTED_SIZE, Control.USE_COMPUTED_SIZE);
        StackPane root = new StackPane(vBox);
        root.setMaxSize(Double.MAX_VALUE, Double.MAX_VALUE);
        Scene scene = new Scene(root);

        primaryStage.setTitle("Hello World!");

     * @param args the command line arguments
    public static void main(String[] args)

    public void addCirclesToGridPane(GridPane gridPane, List<Circle> circles)
        for (int i = 0; i < numberOfColumns * numberOfRows; i++) {
            gridPane.add(circles.get(i), i % numberOfColumns, i / numberOfColumns);

    public Color getRandomColor()
        int r = random.nextInt(255);
        int g = random.nextInt(255);
        int b = random.nextInt(255);

        return Color.rgb(r, g, b);

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JavaFX force all cells to be of the same size in a GridPane

JavaFX force all cells to be of the same size in a GridPane

By : press_kill
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , Turns out the answer was rather simple. The gridpane didn't resize the cell becuse the cell is a StackPane and stackpane minHeight/minWidth is equal to its component so it would refuse to resize. Using setMinSize(0,0) works just fine
JavaFX GridPane: Expand button to fill multiple cells

JavaFX GridPane: Expand button to fill multiple cells

By : Gareth Hobbs
Date : March 29 2020, 07:55 AM
Any of those help Using JavaFX's GridPane container, how can I set a button (or anything else) to expand horizontally until it fills all assigned cells? , You can do
code :
// allow button to grow:

// ask GridPane to make button fill it's cells:
GridPane.setFillWidth(button, true);
JavaFX GridPane cells not auto-sizing to content

JavaFX GridPane cells not auto-sizing to content

By : David Owens
Date : March 29 2020, 07:55 AM
seems to work fine Well, these little gaps are coming from the calculation of the width of all Rectangles, when you bind the value to the height of the Scene.
Dirty solution is to add a -1 margin around the Rectangles using GridPane.setMargin(Node child, Insets value):
code :
// add the rectangle to its respective square in the GridPane
checkerboardPane.add(rect, j, i);
GridPane.setMargin(rect, new Insets(-1, -1, -1, -1));
How to merge cells of a GridPane in JavaFX through code?

How to merge cells of a GridPane in JavaFX through code?

By : user7697582
Date : March 29 2020, 07:55 AM
wish helps you Use GridPane.setColumnSpan or use the appropriate GridPane.add method to add the Slider:
code :
GridPane.setColumnSpan(slider, 3);
gridPane.add(slider, 0, 0, 3, 1);
gridpane javafx clickable cells that get toggled and untoggled

gridpane javafx clickable cells that get toggled and untoggled

By : O. M-Coombs
Date : March 29 2020, 07:55 AM
wish helps you I am trying to create a gridpane that is toggled/untoggled as the user clicks on specific cells. For example, when the user clicks on a cell with the content "*", I would like the content of that specific cell to be changed into a blank cell " ". Similarly, if the user clicks on a cell with a blank content " ", I would like the content of that cell to be changed into a cell with the content "*". , This could be better served with ToggleButton. Comments in code.
code :
import java.util.ArrayList;
import java.util.List;
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.control.ToggleButton;
import javafx.scene.layout.GridPane;
import javafx.stage.Stage;

 * @author Sedrick
public class JavaFXApplication60 extends Application {   

    public void start(Stage primaryStage) {     
        //Start create GUI
        Label lblRequirement11 = new Label("Requirement1");
        Label lblRequirement12 = new Label("Requirement2");
        Label lblRequirement13 = new Label("Requirement3");
        GridPane.setConstraints(lblRequirement11, 1, 0);
        GridPane.setConstraints(lblRequirement12, 2, 0);
        GridPane.setConstraints(lblRequirement13, 3, 0);

        Label lblState1 = new Label("State1");
        ToggleButton toggleButton11 = new ToggleButton();
        ToggleButton toggleButton12 = new ToggleButton();
        ToggleButton toggleButton13 = new ToggleButton();
        GridPane.setConstraints(lblState1, 0, 1);
        GridPane.setConstraints(toggleButton11, 1, 1);
        GridPane.setConstraints(toggleButton12, 2, 1);
        GridPane.setConstraints(toggleButton13, 3, 1);

        Label lblState2 = new Label("State2");
        ToggleButton toggleButton21 = new ToggleButton();
        ToggleButton toggleButton22 = new ToggleButton();
        ToggleButton toggleButton23 = new ToggleButton();
        GridPane.setConstraints(lblState2, 0, 2);
        GridPane.setConstraints(toggleButton21, 1, 2);
        GridPane.setConstraints(toggleButton22, 2, 2);
        GridPane.setConstraints(toggleButton23, 3, 2);

        Label lblState3 = new Label("State3");
        ToggleButton toggleButton31 = new ToggleButton();
        ToggleButton toggleButton32 = new ToggleButton();
        ToggleButton toggleButton33 = new ToggleButton();
        GridPane.setConstraints(lblState3, 0, 3);
        GridPane.setConstraints(toggleButton31, 1, 3);
        GridPane.setConstraints(toggleButton32, 2, 3);
        GridPane.setConstraints(toggleButton33, 3, 3);

        GridPane root = new GridPane(); 
        root.getChildren().addAll(lblRequirement11, lblRequirement12, lblRequirement13);
        root.getChildren().addAll(lblState1, toggleButton11, toggleButton12, toggleButton13);
        root.getChildren().addAll(lblState2, toggleButton21, toggleButton22, toggleButton23);
        root.getChildren().addAll(lblState3, toggleButton31, toggleButton32, toggleButton33);
        //End create GUI

        //Start create ToggleButtons' event handlers.
        List<ToggleButton> toggleButtonList = new ArrayList();

        for(ToggleButton tempToggleButton : toggleButtonList)
            tempToggleButton.setOnAction(actionEvent -> {
        ////End create ToggleButtons' event handlers.

        Scene scene = new Scene(root, 400, 300);

        primaryStage.setTitle("Hello World!");

     * @param args the command line arguments
    public static void main(String[] args) {

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