hi, every one
my problem is how to write code for the following :
- just i create a Button on aToolBar and Panel in the main frame
when i press the button and go to the pane and click any where on the panel the mouse must draw string at (x , y) for mouse .
please tell me how to make it as i try many times but i can't do it as i'm a java beginner
Hi
This should help.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Main extends JPanel implements MouseListener{
/** Size of the panel. */
private static final Dimension PANEL_SIZE = new Dimension(200,200);
/** Background colour of the panel. */
private static final Color BACKGROUND_COLOUR = Color.BLACK;
/** String colour. */
private static final Color STRING_COLOUR = Color.YELLOW;
/** Boolean flag which determines when to draw the string. */
private boolean m_DisplayString;
/** Mouse X position. */
private int m_MouseX;
/** Mouse Y position. */
private int m_MouseY;
/** Constructor. */
public Main() {
m_DisplayString = false;
m_MouseX = 0;
m_MouseY = 0;
// Create panel and set size.
setLayout(new BorderLayout());
setPreferredSize(PANEL_SIZE);
// Add a mouse listener to this panel.
addMouseListener(this);
// Create a button and add a listener.
JButton button = new JButton("off");
button.addActionListener(new ButtonListener());
// Create a toolbar and add the button.
JToolBar toolBar = new JToolBar();
toolBar.add(button);
// Add the toolbar to the panel.
add(toolBar, BorderLayout.NORTH);
// Create frame and add this panel.
JFrame frame = new JFrame();
frame.getContentPane().add(this);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setVisible(true);
}
private class ButtonListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
JButton b = (JButton)e.getSource();
if (b.getText().equals("off")) {
b.setText("on");
m_DisplayString = true;
} else {
b.setText("off");
m_DisplayString = false;
repaint();
}
}
}
protected void paintComponent(Graphics g) {
g.setColor(BACKGROUND_COLOUR);
g.fillRect(0, 0, getWidth(), getHeight());
if (m_DisplayString) {
g.setColor(STRING_COLOUR);
g.drawString("java4all", m_MouseX, m_MouseY);
}
}
public void mousePressed(MouseEvent e) {
m_MouseX = e.getX();
m_MouseY = e.getY();
repaint();
}
// Required by mouseLisener.
public void mouseClicked(MouseEvent e) {}
public void mouseEntered(MouseEvent e) {}
public void mouseExited(MouseEvent e) {}
public void mouseReleased(MouseEvent e) {}
public static void main(String[] args) {
new Main();
}
}
Regards
Paul
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Main extends JPanel implements MouseListener{
/** Size of the panel. */
private static final Dimension PANEL_SIZE = new Dimension(200,200);
/** Background colour of the panel. */
private static final Color BACKGROUND_COLOUR = Color.BLACK;
/** String colour. */
private static final Color STRING_COLOUR = Color.YELLOW;
/** Boolean flag which determines when to draw the string. */
private boolean m_DisplayString;
/** Mouse X position. */
private int m_MouseX;
/** Mouse Y position. */
private int m_MouseY;
/** Constructor. */
public Main() {
m_DisplayString = false;
m_MouseX = 0;
m_MouseY = 0;
// Set the layout manager.
setLayout(new BorderLayout());
// Set the size of this panel.
setPreferredSize(PANEL_SIZE);
// Add a mouse listener to this panel.
addMouseListener(this);
// Create a button and add a listener.
JButton button = new JButton("off");
button.addActionListener(new ButtonListener());
// Create a toolbar and add the button.
JToolBar toolBar = new JToolBar();
toolBar.add(button);
// Add the toolbar to the panel.
add(toolBar, BorderLayout.NORTH);
// Create frame and add this panel.
JFrame frame = new JFrame();
frame.getContentPane().add(this);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setVisible(true);
}
private class ButtonListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
JButton b = (JButton)e.getSource();
if (b.getText().equals("off")) {
b.setText("on");
m_DisplayString = true;
} else {
b.setText("off");
m_DisplayString = false;
repaint();
}
}
}
protected void paintComponent(Graphics g) {
g.setColor(BACKGROUND_COLOUR);
g.fillRect(0, 0, getWidth(), getHeight());
if (m_DisplayString) {
g.setColor(STRING_COLOUR);
g.drawString("java4all", m_MouseX, m_MouseY);
}
}
public void mousePressed(MouseEvent e) {
if (m_DisplayString) {
m_MouseX = e.getX();
m_MouseY = e.getY();
repaint();
}
}
// Required by mouseLisener.
public void mouseClicked(MouseEvent e) {}
public void mouseEntered(MouseEvent e) {}
public void mouseExited(MouseEvent e) {}
public void mouseReleased(MouseEvent e) {}
public static void main(String[] args) {
new Main();
}
}