ActionEvent, ActionListener, and MouseListener
import java.awt.event.ActionEvent; import java.awt.event.ActionListener; /** An action listener that prints a message. */ public class ButtonListener implements ActionListener { public void actionPerformed(ActionEvent event) { System.out.println("You clicked me!!!!"); } }
import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JFrame; /** This program demonstrates how to install an action listener. */ public class ButtonViewer { private static final int FRAME_WIDTH = 100; private static final int FRAME_HEIGHT = 60; public static void main(String[] args) { JFrame frame = new JFrame(); JButton button = new JButton("Click here if you dare!"); frame.add(button); ActionListener listener = new ButtonListener(); button.addActionListener(listener); frame.setSize(FRAME_WIDTH, FRAME_HEIGHT); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setVisible(true); } }
import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.geom.Ellipse2D; import javax.swing.JComponent; /** This component displays a circle that can be moved. */ public class ShapeComponent extends JComponent { private static final int SQUARE_X = 100; private static final int SQUARE_Y = 100; private static final int SQUARE_WIDTH = 50; private static final int SQUARE_HEIGHT = 50; private Ellipse2D.Double circle; public ShapeComponent() { // The circle that the paintComponent method draws circle = new Ellipse2D.Double(SQUARE_X, SQUARE_Y, SQUARE_WIDTH, SQUARE_HEIGHT); } public void paintComponent(Graphics g) { Graphics2D g2 = (Graphics2D) g; g2.draw(circle); } /** Moves the rectangle to the given location. @param x the x-position of the new location @param y the y-position of the new location */ public void moveTo(int x, int y) { circle = new Ellipse2D.Double(x, y, SQUARE_WIDTH, SQUARE_HEIGHT); repaint(); } }
import java.awt.event.MouseListener; import java.awt.event.MouseEvent; import javax.swing.JFrame; import java.awt.Color; /** This program displays a ShapeComponent. */ public class ShapeComponentViewer { private static final int FRAME_WIDTH = 300; private static final int FRAME_HEIGHT = 400; public static void main(String[] args) { final ShapeComponent component = new ShapeComponent(); // Add mouse press listener class MousePressListener implements MouseListener { public void mousePressed(MouseEvent event) { int x = event.getX(); int y = event.getY(); component.moveTo(x, y); } // Do-nothing methods public void mouseReleased(MouseEvent event) {} public void mouseClicked(MouseEvent event) {} public void mouseEntered(MouseEvent event) {} public void mouseExited(MouseEvent event) {} } MouseListener listener = new MousePressListener(); component.addMouseListener(listener); JFrame frame = new JFrame(); frame.getContentPane().setBackground(new Color(255, 0, 0)); frame.add(component); frame.setSize(FRAME_WIDTH, FRAME_HEIGHT); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setVisible(true); } }
Classwork:
Use the resources given to create a new GUI application, YI_CrazyCircle.java and its JFrame to generate random colors background and random filled circles wherever you click the mouse on the window. PLEASE INCLUDE SCREEN SHOT OF YOUR WORK.
Hint: To be able to also change the background at random create a rectangle of size equivalent to the JFrame. Instead of creating two public classes, create one inner class, the JComponnet inside main so it can have access to the JFrame size.