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Java get Coordinate of current mouse position

Posted on 2009-03-29
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Last Modified: 2013-11-23
I have a double array [10][10] or JButtons.  I added the 100 buttons to a JPanel.  I wanted to know if there is a way to get the coordinate position  of the button where the mouse cursor is.  i.e. if the mouse is over the first button that would return 0,0.

Thanks.
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Question by:ubuntuguy
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InteractiveMind earned 500 total points
ID: 24013630
You could add a MouseMotionListener to your frame, which will tell you the new position of the cursor (x,y) every time it moves. But to work out which button it's on would require you knowing the dimensions of the buttons and their insets.

I expect a better method would be to add a MouseListener to each individual button.
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LVL 25

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by:InteractiveMind
ID: 24013690
Here's an example.
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
 
public class Example extends JFrame implements MouseListener
{
   JButton [] buttons=new JButton[100];
   
   public Example()
   {
      super("Example buttons");
      setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      
      setLayout(new GridLayout(10,10));
      
      for(int i=0; i<buttons.length; i++)
      {
         buttons[i]=new JButton(""+i);
         buttons[i].setName(""+i); // this allows us to identify it later
         buttons[i].addMouseListener(this);
         add(buttons[i]);
      }
      
      pack();
      setLocationRelativeTo(null);
      setVisible(true);
   }
   
   public static void main(String[]a)
   {
      new Example();
   }
   
   
   public void mouseEntered(MouseEvent evt)
   {
      JButton buttonPressed=(JButton)evt.getSource();
      
      int xplusy=Integer.parseInt(buttonPressed.getName());
      int x=xplusy % 10;
      int y=(xplusy-x)/10;
      
      setTitle("Currently on button ("+x+", "+y+")");
   }
   
   public void mouseExited(MouseEvent evt)
   {
      setTitle("Example buttons");//back to normal
   }
   
   
   public void mousePressed(MouseEvent evt){}
   public void mouseReleased(MouseEvent evt){}
   public void mouseClicked(MouseEvent evt){}
}

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