CODEWITHSUNDEEP
javaswinguser-interfacejtable
Van
Van

Reputation: 305

Expand JTable size to fill JPanel

I'm trying to create a program that displays a table with data on it, called a Time Log program. I'm having trouble expanding a Jtable to fill a JPanel, since it's currently looking like this:

Huge white gap You can see the huge white gap below the table, but I want the rows to be evenly distributed among the space.

Below is my code.

This is a class I call TimeLogApplication, which has main method and creates a JFrame. 

public static void main(String[] args) {

    /* Create a new frame */
    JFrame guiFrame = new JFrame("Time Log Program");

    /* Set size of the frame */
    guiFrame.setSize(FRAME_WIDTH, FRAME_HEIGHT);

    /* Add the panel */
    guiFrame.add(new TimeLogPanel());

    /* Exit normally on closing the window */
    guiFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    /* Show the frame */
    guiFrame.setVisible(true);
}

The JFrame calls TimeLogPanel class that creates a JPanel. This panel has a Border Layout. The table is added to the center panel, which also has Border Layout. 

public TimeLogPanel() {

    // Set layout, add table panel
    setLayout(new BorderLayout(20, 20));
    add(tablePanel);

    // Create table panel and set layout
    tablePanel = new JPanel();
    tablePanel.setLayout(new BorderLayout());

    // Create a new table with row and column number
    table = new JTable(rowNum, colNum); 
    table.setShowGrid(true);
    table.setGridColor(Color.BLACK);

    // Set a raised border
    table.setBorder(new EtchedBorder(EtchedBorder.RAISED));

    // Add table to table panel
    tablePanel.add(table);      
}

I have tried to get the panel height but since it is not created until the frame is created, the panel height is zero.

Thanks in advance for any suggestions!

UPDATE: I tried out the suggestions and it worked beautifully (adding ComponentListener to the JPanel that holds the JTable). This is what I did:

tablePanel.addComponentListener(new ComponentListener() {

        @Override
        public void componentResized(ComponentEvent e) {
                tablePanelSize = tablePanel.getHeight();
                table.setRowHeight(tablePanel.getHeight()/rowNum); //RowNum is the number of rows
        }

        // Below methods are not used but must be there, as a requirement when adding a listener
        @Override
        public void componentMoved(ComponentEvent e) {          
        }

        @Override
        public void componentShown(ComponentEvent e) {              
        }

        @Override
        public void componentHidden(ComponentEvent e) {             
        }           
    });

Upvotes: 2

Views: 1169

Answers (1)

Stefan Reich
Stefan Reich

Reputation: 1110

I think you have to add a ComponentListener (componentResized event), calculate the row height and then call JTable.setRowHeight.

Upvotes: 3

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