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<TITLE>Packing a Column of a JTable Component (Java Developers Almanac Example)
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<h1>The Java Developers Almanac 1.4</h1>
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<h3>e950. Packing a Column of a JTable Component</h3>
This example demonstrates how to adjust the width of a column to be
just wide enough to show all of the column header and the widest cell
in the column.
<pre> int rows = <font color="#0066ff"><i>3</i></font>;
int cols = <font color="#0066ff"><i>3</i></font>;
JTable table = new JTable(rows, cols);
// Disable auto resizing
table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
// Add data here
// Pack the second column of the table
int vColIndex = <font color="#0066ff"><i>1</i></font>;
int margin = <font color="#0066ff"><i>2</i></font>;
packColumn(table, vColIndex, margin);
public void packColumns(JTable table, int margin) {
for (int c=0; c<table.getColumnCount(); c++) {
packColumn(table, c, 2);
}
}
// Sets the preferred width of the visible column specified by vColIndex. The column
// will be just wide enough to show the column head and the widest cell in the column.
// margin pixels are added to the left and right
// (resulting in an additional width of 2*margin pixels).
public void packColumn(JTable table, int vColIndex, int margin) {
TableModel model = table.getModel();
DefaultTableColumnModel colModel = (DefaultTableColumnModel)table.getColumnModel();
TableColumn col = colModel.getColumn(vColIndex);
int width = 0;
// Get width of column header
TableCellRenderer renderer = col.getHeaderRenderer();
if (renderer == null) {
renderer = table.getTableHeader().getDefaultRenderer();
}
Component comp = renderer.getTableCellRendererComponent(
table, col.getHeaderValue(), false, false, 0, 0);
width = comp.getPreferredSize().width;
// Get maximum width of column data
for (int r=0; r<table.getRowCount(); r++) {
renderer = table.getCellRenderer(r, vColIndex);
comp = renderer.getTableCellRendererComponent(
table, table.getValueAt(r, vColIndex), false, false, r, vColIndex);
width = Math.max(width, comp.getPreferredSize().width);
}
// Add margin
width += 2*margin;
// Set the width
col.setPreferredWidth(width);
}
</pre>
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<b>Related Examples</b></font></td>
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e949. <a class="eglink" href="Pack.html?l=rel">
Packing a JTable Component
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e951. <a class="eglink" href="Grid.html?l=rel">
Setting Grid Line Properties in a JTable Component
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e952. <a class="eglink" href="Gap.html?l=rel">
Setting the Gap Size Between Cells in a JTable Component
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<table width="600" CELLSPACING="0" CELLPADDING="2" BORDER="0">
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See also:
<a class="eglink" href="/egs/javax.swing.table/pkg.html?l=rel#Cells">
Cells
</a>
<a class="eglink" href="/egs/javax.swing.table/pkg.html?l=rel#Column%20Heads">
Column Heads
</a>
<a class="eglink" href="/egs/javax.swing.table/pkg.html?l=rel#Columns">
Columns
</a>
<a class="eglink" href="/egs/javax.swing.table/pkg.html?l=rel#Editing">
Editing
</a>
<a class="eglink" href="/egs/javax.swing.table/pkg.html?l=rel#Events">
Events
</a>
<a class="eglink" href="/egs/javax.swing.table/pkg.html?l=rel#Rows">
Rows
</a>
<a class="eglink" href="/egs/javax.swing.table/pkg.html?l=rel#Scrolling">
Scrolling
</a>
<a class="eglink" href="/egs/javax.swing.table/pkg.html?l=rel#Selection">
Selection
</a>
<a class="eglink" href="/egs/javax.swing.table/pkg.html?l=rel#Sorting">
Sorting
</a>
<a class="eglink" href="/egs/javax.swing.table/pkg.html?l=rel#Table%20Model">
Table Model
</a>
<a class="eglink" href="/egs/javax.swing.table/pkg.html?l=rel#Tool%20Tips">
Tool Tips
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