如何在JInternalFrame中的ScrollPane中动态设置JTable的宽度

Question

I have a little doubt using JTable.

This is that I want:

• To set a horizontal ScroollBar in my JTable with no maximized window.
• To see each column with the max width possible (or column header or text in cell).
• Expand dinamically my window depending of JTable's width (I don't know if it is possible).

This is that I have:

• A Jtable with no horizontal ScrollBar (if i put "myTable.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);", my table doesn't occupy all width of JInternalFrame)
• My Jtable doesn't show all datas in a cell if its size is long.

I will appreciate any help.

AplicacionesInternalFrame:

public AplicacionesJInternalFrame() 
{
      super("Aplicaciones", 
              true, //resizable
              true, //closable
              true, //maximizable
              true);//iconifiable

      //...Create the GUI and put it in the window...

      //...Then set the window size or call pack...
      //setSize(300,300);

      //Set the window's location.
      setLocation(xOffset*openFrameCount, yOffset*openFrameCount);
      getContentPane().add(createToolBar(),BorderLayout.NORTH);

      jTableAplicaciones = new JTable(new AplicacionesTableModel());        
      jTableAplicaciones.getColumnModel().getColumn(0).setCellRenderer(new AplicacionesRenderer());
      jTableAplicaciones.setPreferredScrollableViewportSize(new Dimension(500, 270));
      jTableAplicaciones.setFillsViewportHeight(true);

      JScrollPane scrollPane = new JScrollPane(jTableAplicaciones);
      scrollPane.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED); 
      scrollPane.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED);

      initColumnSizes(jTableAplicaciones);
      //jTableAplicaciones.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);

      add(scrollPane);        
      pack();
}


private void initColumnSizes(JTable table) {
    TableColumn column = null;
    Component comp = null;
    int headerWidth = 0;
    TableCellRenderer headerRenderer =
        table.getTableHeader().getDefaultRenderer();

    int width = 0;
    for (int i = 0; i < table.getColumnCount(); i++) 
    {           
        /* Tamaño dato de celda */
        TableCellRenderer renderer = table.getCellRenderer(0, i);
        Component componente = table.prepareRenderer(renderer, 0, i);
        int componenteWidth = componente.getPreferredSize().width;

        /* Tamaño cabecera columna */
        column = table.getColumnModel().getColumn(i);
        comp = headerRenderer.getTableCellRendererComponent(
                null, column.getHeaderValue(),
                false, false, 0, 0);            
        headerWidth = comp.getPreferredSize().width;
        column.setPreferredWidth(Math.max(headerWidth, componenteWidth)+2);
    }        
}

If you need any other data, please let me know it. Thanks in advance.

Answer 1

My Jtable doesn't show all datas in a cell if its size is long.

You can use the Table Column Adjuster to make sure all columns are an appropriate. However, this will not force the table to fill the entire width.