JTable's JButton events

[ba...@hbs.edu]

I have some JButtons in my JTable, and a renderer to
show them. However, events are not propagated to the
JButtons' ActionListeners. How is this supposed to
work - if a JButton belongs to a JTable, is it the
JTable who must handle the events and pass them on to
the right JButton? I hope not...

Nor can I see anything obvious like "TableCellEvent".

So, how do you register those JButtons?

Thanks!
David Barts

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[Mr. Tines]

###

On Thu, 04 Feb 1999 23:46:39 GMT, in <79dbgs$gq3$1...@nnrp1.dejanews.com>
ba...@hbs.edu wrote.....

> I have some JButtons in my JTable, and a renderer to
> show them. However, events are not propagated to the

You do not have *any* JButtons in your JTable. You have
a lot of pictures of JButtons, which is a rather different
thing. All a renderer does is, when the table says
"Here's all i know about a cell", to reply "And here's
how to draw it".

> JButtons' ActionListeners. How is this supposed to
> work - if a JButton belongs to a JTable, is it the
> JTable who must handle the events and pass them on to
> the right JButton? I hope not...
>
> Nor can I see anything obvious like "TableCellEvent".
>
> So, how do you register those JButtons?

You can simulate this by putting a mouse listener on the
JTable, and using the get cell from position method of
the table to figure out which cell, then tweaking the
appearance of the cell to reflect mouse down, and firing
an action if the depressed button picture also gets a
mouse up.

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[ba...@hbs.edu]

Mr. Tines wrote:

> > JButtons' ActionListeners. How is this supposed to
> > work - if a JButton belongs to a JTable, is it the
> > JTable who must handle the events and pass them on to
> > the right JButton? I hope not...
> >
> > Nor can I see anything obvious like "TableCellEvent".
> >
> > So, how do you register those JButtons?
>
> You can simulate this by putting a mouse listener on the
> JTable, and using the get cell from position method of
> the table to figure out which cell, then tweaking the
> appearance of the cell to reflect mouse down, and firing
> an action if the depressed button picture also gets a
> mouse up.

I've had some progress with hacks like this:

public Component
getTableCellRendererComponent(JTable table, Object value,
boolean isSelected, boolean hasFocus,
int row, int column ) {
if ( isSelected && hasFocus ) {
// execute button's callback code ...
table.clearSelection();
}
...
}

Perhaps something could also be done via TableCellEditor (also hack-like).

However, this clearly goes against all the talk of "code reuse" --
I can't reuse a JButton within my GUI!

There either has to be a better way or it's one down for JavaSoft.

[Dave Postill]

[This followup was posted to comp.lang.java.programmer and a courtesy copy was sent to the cited
author, ba...@hbs.edu]

In article <79dbgs$gq3$1...@nnrp1.dejanews.com>, on Thu, 04 Feb 1999 23:46:39 GMT, ba...@hbs.edu wrote:

| I have some JButtons in my JTable, and a renderer to
| show them. However, events are not propagated to the

| JButtons' ActionListeners. How is this supposed to
| work - if a JButton belongs to a JTable, is it the
| JTable who must handle the events and pass them on to
| the right JButton? I hope not...
|
| Nor can I see anything obvious like "TableCellEvent".
|
| So, how do you register those JButtons?

See "Display any JComponent in a cell".

Extract:

"the TableUI class passes on the event that initiated the
edit ( the mouse_pressed event ) to the editor component.
Since many components expect mouse_released and mouse_clicked
to follow, we oblige these components."

<http://www.codeguru.com/java/articles/162.shtml>
davep
--
Dave Postill Investment Intelligence Systems Corp
Galaxy Support Leader +44 (0)171 628 6960 [voice]
<mailto:da...@iisc.co.uk> +44 (0)171 638 7528 [fax]
<mailto:dave.p...@pobox.com> <http://www.iisc.co.uk>

[ba...@hbs.edu]

In article <36cc52cd...@news.demon.co.uk>,

da...@iisc.co.uk wrote:
> Extract:
>
> "the TableUI class passes on the event that initiated the
> edit ( the mouse_pressed event ) to the editor component.
> Since many components expect mouse_released and mouse_clicked
> to follow, we oblige these components."
>
> <http://www.codeguru.com/java/articles/162.shtml>
> davep

That's great, thanks!