JTable: get object location inside a cell

Question

I can't figure out how to solve this problem:

I have a JTable with a custom cell renderer. Inside a cell renderer I put a JLabel with a grid bag layout.

If I try to obtain the location of the JLabel inside the renderer, I always get 0, 0. I tried to revalidate the JLabel before but I'm not able to find a correct solution.

This is the code of the custom renderer:

public CustomRenderer() {
    // set the renderer layout to null
    setLayout(new GridBagLayout());
    // create the layouts label
    layoutsLbl = new JLabel("Layout");
    // create a grid bag constraints instance
    GridBagConstraints gbc = new GridBagConstraints();
    // first column
    gbc.gridx = 0;
    // first row
    gbc.gridy = 0;
    // maximum horizontal weight
    gbc.weightx = 1;
    // anchor to the top left corner
    gbc.anchor = GridBagConstraints.FIRST_LINE_START;
    // fill horizontally
    gbc.fill = GridBagConstraints.HORIZONTAL;
    // set the insets
    gbc.insets = new Insets(35, 0, 10, 0);
    // add the layouts label to the view
    add(layoutsLbl, gbc);
}

public String clickCheck() {
    // revalidate the layouts label
    layoutsLbl.revalidate();
    // get the layouts label location
    System.out.println("Label location: " + layoutsLbl.getLocation());
}

I know that in some cases I might be able to calculate the JLabel location because it is fixed, but I would like to have a general approach because I need it for a renderer where I have a lot of dinamically generated JLabel.

The final goal is to find the location of each JLabel to be able to identify which JLabel has been clicked with a MouseListener attached to the table. I'm able to find the clicked cell, the mouse location in the cell and therefore I need the JLabel location in the cell to test it against the mouse location.

Answer 1

The final goal is to find the location of each JLabel to be able to identify Blockquote which JLabel has been clicked with a MouseListener attached to the table.

This Problem is pretty easy to solve. Just use this simple Code snippet to get the clicked Object.

this.addMouseListener(new MouseListener() {
        @Override
        public void mouseClicked(MouseEvent e) {

            Component clicked = getComponentAt(e.getPoint());
            if(clicked instanceof JLabel){
                JLabel myLabel = (JLabel) clicked;
                //obviously myLabel is the clicked JLabel
                System.out.println("Clicked Label: " + myLabel.getLocation());
            }

        }

        @Override
        public void mousePressed(MouseEvent e) {

        }

        @Override
        public void mouseReleased(MouseEvent e) {

        }

        @Override
        public void mouseEntered(MouseEvent e) {

        }

        @Override
        public void mouseExited(MouseEvent e) {

        }
    });

Using the getLocation() Method will now give you the real Location the JLabel has.

UPDATE: Here is the requested complete Example (Using JTable instead)

This is my Main:

public static void main(String[] args) {
    JFrame frame =  new JFrame();
    frame.setContentPane(new CostumTable());
    frame.getContentPane().addMouseListener(new MouseListener() {

        @Override
        public void mouseClicked(MouseEvent e) {

            Component clicked = frame.getContentPane().getComponentAt(e.getPoint());
            if(clicked instanceof JLabel){
                JLabel myLabel = (JLabel) clicked;
                //obviously myLabel is the clicked JLabel
                System.out.println("Text of clicked Label: " + myLabel.getText());
            }

        }
        @Override
        public void mousePressed(MouseEvent e) {

        }
        @Override
        public void mouseReleased(MouseEvent e) {

        }
        @Override
        public void mouseEntered(MouseEvent e) {

        }
        @Override
        public void mouseExited(MouseEvent e) {

        }

    });

    frame.setSize(200, 500);
    frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    frame.setVisible(true);
}

and this would be the CustomRenderer (now CostumTable):

    public CostumTable() {
    // set the renderer layout to GridBagLayout
    setLayout(new GridBagLayout());
    // create the layouts label
    layoutsLbl = new JLabel("Layout");
    // create a grid bag constraints instance
    GridBagConstraints gbc = new GridBagConstraints();
    // first column
    gbc.gridx = 0;
    // first row
    gbc.gridy = 0;
    // maximum horizontal weight
    gbc.weightx = 1;
    // anchor to the top left corner
    gbc.anchor = GridBagConstraints.FIRST_LINE_START;
    // fill horizontally
    gbc.fill = GridBagConstraints.HORIZONTAL;
    // set the insets
    gbc.insets = new Insets(35, 0, 10, 0);
    // add the layouts label to the view
    add(layoutsLbl, gbc);


    //Just here to test the MousListener
    List<JLabel> testLabel = new ArrayList<>();
    for(int i = 0; i < 3; i++) {
        testLabel.add(new JLabel("TestLabel number " + i));
        gbc.gridx = 0;
        gbc.gridy = i + 1;
        add(testLabel.get(i), gbc);
    }
    //
}

public String clickCheck() {
    // revalidate the layouts label
    layoutsLbl.revalidate();
    // get the layouts label location
    System.out.println("Label location: " + layoutsLbl.getLocation());
    return null; //I dont know what you want to return
}