- Colored ToolTips
- Detachable/Non-Detachable Toolbars
- Individualized List ToolTips
- Non-Auto-Resize Table Columns
- Table Header Icons
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Non-Auto–Resize Table Columns
When a table component is created from the JTable class, JTable automatically resizes columns horizontally so they all appear in the table's window. Figure 6 illustrates this scenario.
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By default, a JTable component automatically resizes its columns so they all appear in the window.
Automatic resizing can be disabled by calling JTable's setAutoResizeMode method with an AUTO_RESIZE_OFF argument. As a result, a column might be partially displayed and other columns might be hidden. However, the additional room makes it possible to see more column information (see Figure 7).
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A JTable component's automatic column resizing can be disabled.
The GUI in Figure 7 was generated by an application called NARTableColumns. The source code to this application (shown in Listing 4) demonstrates calling setAutoResizeMode with an AUTO_RESIZE_OFF argument. (Check out the SDK 1.3 documentation on this method to learn what other arguments can be passed.)
Listing 4 The NARTableColumns application source code
// NARTableColumns.java
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.table.*;
class NARTableColumns extends JFrame
{
NARTableColumns (String title)
{
// Pass the title argument to the JFrame superclass so that the
// contents of title appear in the JFrame's title bar.
super (title);
// Exit the application by calling System.exit when the user
// either selects Close from the System menu or clicks the X
// button.
setDefaultCloseOperation (EXIT_ON_CLOSE);
// Define the data model for the JTable.
TableModel dataModel = new AbstractTableModel ()
{
final static int NROWS = 20;
final static int NCOLS = 5;
Object [][] rowData = new Object [NROWS] [];
// This instance initializer creates the data when an object
// is created from this subclass of the AbstractTableModel
// class.
{
for (int i = 0; i < NROWS; i++)
rowData [i] = new Object [NCOLS];
int x = 0;
for (int row = 0; row < NROWS; row++)
for (int col = 0; col < NCOLS; col++)
rowData [row] [col] = new Integer (2 * x++);
}
public int getColumnCount ()
{
return NCOLS;
}
public int getRowCount ()
{
return NROWS;
}
public Object getValueAt (int row, int col)
{
return rowData [row] [col];
}
public boolean isCellEditable (int row, int col)
{
return false;
}
public void setValueAt (Object value, int row, int col)
{
rowData [row] [col] = value;
fireTableCellUpdated (row, col);
}
};
// Create the JTable and assign it the predefined data model.
JTable table = new JTable (dataModel);
// Do not allow table columns to be automatically resized so
// they all fit within the Frame window.
table.setAutoResizeMode (JTable.AUTO_RESIZE_OFF);
// Create a JScrollPane and add the JTable to this container.
JScrollPane sp = new JScrollPane (table);
// Set the JTable's preferred "viewport" size for viewing
// JTable data.
table.setPreferredScrollableViewportSize (new Dimension (250,
180));
// Add the JScrollPane to the JFrame's content pane.
getContentPane ().add (sp);
// Set the size of the JFrame window.
setSize (300, 250);
// Show the JFrame window.
setVisible (true);
}
public static void main (String [] args)
{
new NARTableColumns ("Non-auto-resize Table Columns");
}
}