PROG4_Wk3b

Main.java

package PROG4_WK3b;

import javafx.application.Application;
import javafx.event.EventHandler;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.GridPane;

public class Main extends Application {
	@Override
	public void start(Stage primaryStage) {
		try {
			Squares scene = new Squares(400, 300);

			scene.enterStage(primaryStage);
		
			primaryStage.show();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

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

Squares.java

package PROG4_WK3b;

import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.event.Event;
import javafx.event.EventHandler;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.Background;
import javafx.scene.layout.BackgroundFill;
import javafx.scene.layout.Border;
import javafx.scene.layout.BorderStroke;
import javafx.scene.layout.BorderStrokeStyle;
import javafx.scene.layout.BorderWidths;
import javafx.scene.layout.ColumnConstraints;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.RowConstraints;
import javafx.scene.layout.StackPane;
import javafx.scene.paint.Color;
import javafx.scene.paint.Paint;
import javafx.stage.Stage;

public class Squares {
	final private int cols = 3;
	final private int rows = 2;

	private Scene scene;

	public Squares(int width, int height) {
		super();

		GridPane gridPane = new GridPane();
		// create the square panes
		for (int c = 0; c < cols; c++) {
			for (int r = 0; r < rows; r++) {
				Color mycolor = Color.rgb(r * 50 + 50, c * 30 + 30, r + c * 60 + 60);
				StackPane sqp = new StackPane();
				
				sqp.setBackground(new Background(new BackgroundFill(mycolor, null, null)));
				

//				sqp.focusedProperty().addListener(new ChangeListener<Boolean>() {
//					@Override
//					public void changed(ObservableValue<? extends Boolean> observable, Boolean oldValue,
//							Boolean newValue) {
//						if (newValue) {
//							sqp.setBorder(new Border(new BorderStroke(Color.WHITE, BorderStrokeStyle.SOLID, null, new BorderWidths(3))));
//						} else {
//							sqp.setBorder(null);
//						}
//						
//					}
//				});				
				sqp.focusedProperty().addListener((observable, oldValue, newValue) -> {
					if (newValue) {
						sqp.setBorder(new Border(new BorderStroke(Color.WHITE, BorderStrokeStyle.SOLID, null, new BorderWidths(3))));
					} else {
						sqp.setBorder(null);
					}
				});
				
				
//				sqp.setOnMouseEntered(new EventHandler<MouseEvent>() {
//
//					@Override
//					public void handle(MouseEvent event) {
//						sqp.requestFocus();
//					}
//				});
				sqp.setOnMouseEntered(evt -> sqp.requestFocus());
				
				
				gridPane.add(sqp, c, r);
			}
		}
		ColumnConstraints columnConstraint = new ColumnConstraints();
		columnConstraint.setPercentWidth(100d / 3d);
		RowConstraints rowConstraint = new RowConstraints();
		rowConstraint.setPercentHeight(50);
		gridPane.getRowConstraints().addAll(rowConstraint, rowConstraint);
		gridPane.getColumnConstraints().addAll(columnConstraint, columnConstraint, columnConstraint);

		scene = new Scene(gridPane, width, height);
	}

	public void enterStage(Stage stage) {
		stage.setScene(scene);
	}

}