Java – how to dynamically set rowheight in JTable

I want to place a string in a JTable that is longer than the given cell width

import javax.swing.*;

public class ExampleTable {

public JPanel createTable() {               
    JPanel totalGUI = new JPanel();

    //define titles for table
    String[] title = {"TITLE1","TITLE2","TITLE3"};

    //table data
    Object[][] playerdata = {       
    {new Integer(34),"Steve","test test test"},{new Integer(32),"Patrick","dumdi dumdi dummdi dumm di di didumm"},{new Integer(10),"Sarah","blabla bla bla blabla bla bla blabla"},};

    //create object 'textTable'
    JTable textTable = new JTable(playerdata,title);

    //set column width
    textTable.setAutoResizeMode(JTable.AUTO_RESIZE_OFF); 
    textTable.getColumnModel().getColumn(0).setPreferredWidth(60);
    textTable.getColumnModel().getColumn(1).setPreferredWidth(60);
    textTable.setDefaultRenderer(String.class,new RowHeightCellRenderer());

    //scrollbar
    JScrollPane scrollPane = new JScrollPane(textTable);

    totalGUI.add(scrollPane);               
    return totalGUI;
}

private static void createAndShowGUI() {

    //create main frame
    JFrame mainFrame = new JFrame("");
    ExampleTable test = new ExampleTable();

    JPanel totalGUI = new JPanel();
    totalGUI = test.createTable();

    //visible mode
    mainFrame.add(totalGUI); //integrate main panel to main frame
    mainFrame.pack();
    mainFrame.setVisible(true);     
}


public static void main (String[] args) {               

    createAndShowGUI();     

}//main
}

Here, you will see the code for wrapping each text in a given cell

import java.awt.*;
    import javax.swing.*;
    import javax.swing.table.*;


    public class RowHeightCellRenderer extends JTextArea implements TableCellRenderer
    {
      /**
         * 
         */
        private static final long serialVersionUID = 1L;

    public Component getTableCellRendererComponent (JTable table,Object value,boolean isSelected,boolean hasFocus,int row,int column )  {
        setText( value.toString() );    
        return this;
      }
    }

Thanks, but I want to dynamically implement rowheight, depending on the string length... I want to read the whole string / text in the cell Any suggestions?

I'm a JAVA beginner. This is my first question I'm glad to get the answer

Solution

There are several problems with using jtextarea as a rendering component (and most, if not all, have been explained in several QA's on this site) Try to summarize:

Adjust the height of a single row to the size requirements of the rendering component

Basically, the way to go is to cycle through the cells as needed

>Configure its renderer with data > ask preferred size of rendering components > set table row height to pref height

The updaterowheight method in the problem edited by OP is very good

Jtextarea calculates its preferredSize

In order to get a reasonable size hint, it needs to "sow" in another dimension with some reasonable sizes That is, if we want a height that requires width, it must be done in each call In the context of a table, a reasonable width is the current column width:

public Component getTableCellRendererComponent(JTable table,int column) {
    ... // configure visuals
    setText((String) value);
    setSize(table.getColumnModel().getColumn(column).getWidth(),Short.MAX_VALUE);
    return this;
}// getTableCellRendererComponent

Dynamic height adjustment

The row height is completely determined in some stable states of the table / column / model Therefore, you should set it (call updaterowheight) once after initialization and when any state it depends on changes

// TableModelListener
@Override
public void tableChanged(TableModelEvent e) {
    updateRowHeights();
}

// TableColumnModelListener
@Override
public void columnMarginChanged(ChangeEvent e) {
    updateRowHeights();
}

be careful

As a general rule, all parameters in getxxrendercomponent are strictly read-only, and the implementation must not change any state of the caller It is wrong to update rowheight from the renderer