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<TITLE>Scrolling a Cell to the Center of a JTable Component
(Java Developers Almanac Example)
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<B><A HREF="../javax.swing.table/pkg.html#Scrolling">Scrolling</A></B><font color="#666666" SIZE="-2">
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<h3>
e947.
Scrolling a Cell to the Center of a JTable Component</h3>
This example demonstrates how to scroll the view so that a specified
cell appears in the center of the view.
<pre>
// Make the cell (1,2) is appear in the center of the view
int rowIndex = <font color="#0066ff"><i>1</i></font>;
int vColIndex = <font color="#0066ff"><i>2</i></font>;
scrollToCenter(<font color="#0066ff"><i>table</i></font>, rowIndex, vColIndex);
// Assumes table is contained in a JScrollPane.
// Scrolls the cell (rowIndex, vColIndex) so that it is visible
// at the center of viewport.
public void scrollToCenter(JTable table, int rowIndex, int vColIndex) {
if (!(table.getParent() instanceof JViewport)) {
return;
}
JViewport viewport = (JViewport)table.getParent();
// This rectangle is relative to the table where the
// northwest corner of cell (0,0) is always (0,0).
Rectangle rect = table.getCellRect(rowIndex, vColIndex, true);
// The location of the view relative to the table
Rectangle viewRect = viewport.getViewRect();
// Translate the cell location so that it is relative
// to the view, assuming the northwest corner of the
// view is (0,0).
rect.setLocation(rect.x-viewRect.x, rect.y-viewRect.y);
// Calculate location of rect if it were at the center of view
int centerX = (viewRect.width-rect.width)/2;
int centerY = (viewRect.height-rect.height)/2;
// Fake the location of the cell so that scrollRectToVisible
// will move the cell to the center
if (rect.x < centerX) {
centerX = -centerX;
}
if (rect.y < centerY) {
centerY = -centerY;
}
rect.translate(centerX, centerY);
// Scroll the area into view.
viewport.scrollRectToVisible(rect);
}
</pre>
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Related Examples
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e944. <a class="eglink" href="Hscroll.html?l=rel">
Creating a Scrollable JTable Component
</a>
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e945. <a class="eglink" href="IsVis.html?l=rel">
Determining If a Cell Is Visible in a JTable Component
</a>
<br>
e946. <a class="eglink" href="Vis.html?l=rel">
Making a Cell Visible 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#Events">
Events
</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#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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