Position the tooltip

[Neeba Rebbaca]

Hi,

I have written a code for displaying a rectangle object and displaying tooltip on MouseOver. My problem is, on placing the mouse over the rectange object, the tooltip getting displayed on the top of the panel, then displaying over the object. How to avoid displaying on the top of the panel.

Here is my code.

public class MD2 extends JApplet
{
    @Override
    public void init()
    {
        Container cont      = getContentPane();
        cont.setLayout(new BorderLayout());
        setPreferredSize(new Dimension(300, 300));
        JScrollPane scroll  = new JScrollPane();
        getContentPane().add(scroll, "Center");
        setBackground(Color.WHITE);
        scroll.getViewport().add(new Imagepanel());
    }
    
    private class Imagepanel extends JPanel implements MouseListener,MouseMotionListener,ActionListener
    {
        Rectangle rect = new Rectangle(100,120,50,50);
        JLabel label;
        JPanel toolTip;
        
        Imagepanel()
        {
            addMouseMotionListener(this);
            addMouseListener(this);
            
            label = new JLabel();
            toolTip = new JPanel();
            
            toolTip.setBackground(Color.white);
            
            label.setHorizontalAlignment(JLabel.LEFT);
            label.setOpaque(true);
            label.setBackground(UIManager.getColor("ToolTip.background"));
            label.setBorder(UIManager.getBorder("ToolTip.border"));
            
            toolTip.add(label);
            toolTip.setVisible(false);
            add(toolTip);
            toolTip.setOpaque(true);
        }
        @Override
        protected void paintComponent(Graphics g)
        {
            super.paintComponent(g);
            Graphics2D g2 = (Graphics2D)g;
            this.setDoubleBuffered(true);
            g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);
            g2.setColor(getBackground());
            //g2.fillRect(0, 0, getWidth(), getHeight());
            g2.setColor(getForeground());
            setBackground(Color.WHITE);
            
            g2.setColor(Color.BLUE);
            g2.fill(rect);
        }
        public void mouseClicked(MouseEvent e) {}
        public void mousePressed(MouseEvent e) {}
        public void mouseReleased(MouseEvent e) {}
        public void mouseEntered(MouseEvent e) {}
        public void mouseExited(MouseEvent e) {}
        public void mouseDragged(MouseEvent e) 
        {
            
        }
        public void mouseMoved(MouseEvent e) 
        {
            boolean traversing = false;
            Point p = e.getPoint();
            if(rect.contains(p))
            {
                SwingUtilities.convertPointToScreen(p, this);
                showToolTip(e.getX(),e.getY());
                
                traversing = true;
                repaint();
            }
            
            if(!traversing && isToolTipShowing())
                hideToolTip();
        }
        public void showToolTip(int x,int y)
        {
            label.setText("Over the Object...");
            toolTip.setLocation(x,y+30);//p.x,p.y-80);
            toolTip.setVisible(true);
        }
        public boolean isToolTipShowing()
        {
               return true;
        }
        public void hideToolTip()
        {
            toolTip.setVisible(false);
        }
        public void actionPerformed(ActionEvent e) {}
        
    }
    
    public static void main(String[] args)
    {
        JApplet applet = new MD2();
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.add(applet);
        f.setSize(400,400);
        f.setLocationRelativeTo(null);
        applet.init();
        f.setVisible(true);
    }
}

[Akhilesh Trivedi]

I am not sure but I just found a similar thread here on ranch itself.

https://coderanch.com/t/465626/GUI/java/Tooltip-Line-or-Rectangle

[Neeba Rebbaca]

But that doesn't help me. still facing the same problem.

[Darryl Burke]

Regardless of all else, do NOT setBackground(...) or setdoubleBuffered(...) or otherwise change the state of the component in any way in a painting method override (line 51 of the posted code).

Also, adding a component to its viewport is NOT the correct way to use a JScrollPane. Read the API and follow the link to the tutorial to learn how to correctly use scroll panes.

You would also do well to get rid of all redundant code before posting on a forum.

setting the content pane's layout to BorderLayout -- which it is, by default (07)

setBackground calls that are irrelevant to the stated problem (11, 29, 51)

setColor(...) calls that each supersede tha last (48, 50, 53)

And if this is a standalone application, as evidenced by a main(...) method, why do you extend JApplet? Applets are meant for diaply in a browser.

[Neeba Rebbaca]

Thanks for the reply.

I'm debugging the code, so i added the main, actually it is a web application. Still I could not able to fix the problem. I would be very help if someone say me, where i went wrong.
Thanks in advance.