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<TITLE>Listening for Changes to the Rows and Columns of a JTable Component (Java Developers Almanac Example)
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<META CONTENT="Patrick Chan" NAME="AUTHOR">
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<h1>The Java Developers Almanac 1.4</h1>
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<B><A HREF="../javax.swing.table/pkg.html#Events">Events</A></B><font color="#666666" class="xsmall-font">
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<h3>e965. Listening for Changes to the Rows and Columns of a JTable Component</h3>
This example demonstrates how to detect row and columns being added,
deleted, or changed in a table component. To listen for these events,
a listener must be added to the <code>JTable</code>'s table model.
Note: When a column is added, the type of the event is <code>UPDATE</code>.
<pre>
<font color="#0066ff"><i>table</i></font>.getModel().addTableModelListener(new MyTableModelListener(table));
public class MyTableModelListener implements TableModelListener {
JTable table;
// It is necessary to keep the table since it is not possible
// to determine the table from the event's source
MyTableModelListener(JTable table) {
this.table = table;
}
public void tableChanged(TableModelEvent e) {
int firstRow = e.getFirstRow();
int lastRow = e.getLastRow();
int mColIndex = e.getColumn();
switch (e.getType()) {
case TableModelEvent.INSERT:
// The inserted rows are in the range [firstRow, lastRow]
for (int r=firstRow; r<=lastRow; r++) {
// Row r was inserted
}
break;
case TableModelEvent.UPDATE:
if (firstRow == TableModelEvent.HEADER_ROW) {
if (mColIndex == TableModelEvent.ALL_COLUMNS) {
// A column was added
} else {
// Column mColIndex in header changed
}
} else {
// The rows in the range [firstRow, lastRow] changed
for (int r=firstRow; r<=lastRow; r++) {
// Row r was changed
if (mColIndex == TableModelEvent.ALL_COLUMNS) {
// All columns in the range of rows have changed
} else {
// Column mColIndex changed
}
}
}
break;
case TableModelEvent.DELETE:
// The rows in the range [firstRow, lastRow] changed
for (int r=firstRow; r<=lastRow; r++) {
// Row r was deleted
}
break;
}
}
}
</pre>
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<b>Related Examples</b></font></td>
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e964. <a class="eglink" href="SelEvent.html?l=rel">
Listening for Selection Events in a JTable Component
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e966. <a class="eglink" href="ColEvent.html?l=rel">
Listening for Column-Related Changes in a JTable Component
</a>
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e967. <a class="eglink" href="ColHeadEvent.html?l=rel">
Listening for Clicks on a Column Header in a JTable Component
</a>
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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#Layout">
Layout
</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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