Identifying text truncation in JTable cells

Dusan Chromy

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May 9, 2003, 5:18:34 AM5/9/03

to

Hi,

if a text in a JTable cell is too wide to fit in, it gets the elipsis
"..."
at the end and gets truncated.

Is there any way to tell whether this has happened in a particular
cell?
I wrote a table cell renderer that shows a tool tip text with the
cell's value, now I'd like to limit the renderer to show the tool tip
for those truncated cells only.

Thanks,

Dusan Chromy

Jacob

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May 9, 2003, 6:39:21 AM5/9/03

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You can compare the width of the column with the width
of the text (using class FontMetrics), but I assume you
maybe want a more explicit approach.

Henrietta Cirnat

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May 11, 2003, 1:14:37 PM5/11/03

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Hi,

i had the same problem! JTable has an attribute autoResizeMode. In default
state it is set to JTable.AUTO_RESIZE_ALL_COLUMNS. In this case JTable
simply truncates everything to the "right"size. I have set this mode to
JTable.AUTO_RESIZE_OFF.

I know, this is not an answer to your question above, but maybe it can be
useful to you, if you want to avoid this problem.

Henrietta

Dusan Chromy

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May 12, 2003, 4:45:59 AM5/12/03

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Jacob <ja...@yahoo.com> wrote in message news:<3EBB8559...@yahoo.com>...

Well, I was kinda hoping there was an easier way to achieve it (a less
explicit approach :-), but one eventuallly has to do the dirty work...

I am now busy with other parts of the graphical interface, but I hope
to have time to return to this later. When/If I get the FontMetrics
solution working, I'll post it here.

Regards,

Dusan

Dusan Chromy

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May 14, 2003, 12:53:30 PM5/14/03

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Jacob <ja...@yahoo.com> wrote in message news:<3EBB8559...@yahoo.com>...

OK, I finally got it working. Subclassing DefaultTableCellRenderer
does the trick (the class included below). You need a TableColumn
object, then you use it like this:

TableColumn tc = ...
tc.setCellRenderer( new ToolTipRenderer(tc) );

Here comes the code:

import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.TableColumn;
/**
*
* @author chromy
* @version
*/
public class ToolTipRenderer extends DefaultTableCellRenderer {

public ToolTipRenderer(TableColumn col) {
m_col = col;
}

protected void setValue(Object value) {

super.setValue(value);

int cellWidth = getPreferredSize().width;
int colWidth = m_col.getWidth();

setToolTipText(null); // fall-back value first

if (colWidth <= cellWidth)
try {
setToolTipText((String)value);
} catch (Exception e) {}
}

private TableColumn m_col;
}

her...@gmail.com

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Jun 22, 2016, 2:35:16 AM6/22/16

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Thanks for the hints on how to do this. I elaborated a little on it trying to get rid of the TableColumn. I aldready had a subclass of DefaultTableCellRenderer doing some custom coloring in getTableCellRendererComponent(). I could extend this method for doing the tooltip stuff - see this stripped down version:

public class TableCellRendererMy extends DefaultTableCellRenderer implements TableCellRenderer {

public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);

double cellPrefWidth = getPreferredSize().getWidth();
double cellWidth= table.getCellRect(row, column, false).getWidth();

if (cellPrefWidth>cellWidth) {
try {
setToolTipText(String.valueOf(value));
} catch (Exception e) {
}
}

return this;
}
}

regerds,
stephan