Drop Down JToolBar Element?

[Nicholas Pappas]

I was wondering if there is an element, or a built in mutation of
JComboBox (perhaps), that provided a drop down button like some programs
have for their Undo button.
The button is an icon w/ an arrow next to it. Hit the icon and you undo
(in this case) the last change. Hit the arrow and you get a list of all
the actions, allowing you to select multiple undos at once.

I thought I remembered seeing this widget in one of my books, but maybe
I'm starting to remember things for lack of sleep (and too much Dew).
It seems like I can create a simple button that will trigger a popup
element with a list in it (or whatever element I need). Is the route I
am going to need to take?

Many thanks, as always!

Nick
--
My software has no bugs. It just develops random features.

reply to ni...@DROPME.rightstep.org

[Nicholas Pappas]

I found an example of what I am trying to do:
http://www.esus.com/docs/GetQuestionPage.jsp?uid=1046

... but then want me to subscribe before getting the code. I'm going to
keep digging around since I know I was not hallucinating and the widget
is possible. :)

[Nicholas Pappas]

I broke down and paid for the subscription... curse my impatience. :(
Hopefully I'll be able to find other good source there that will make the
cost worthwhile. :P

Nicholas Pappas wrote:
> I found an example of what I am trying to do:
> http://www.esus.com/docs/GetQuestionPage.jsp?uid=1046

--

[Frank Breuer]

Nicholas Pappas <righ...@hotmail.com> wrote in
news:3D722DA...@hotmail.com:

> I was wondering if there is an element, or a built in mutation of
> JComboBox (perhaps), that provided a drop down button like some
> programs have for their Undo button.

Sun's Look & Feel guidelines specify such a toolbar button. However,
there is no implmentation in Swing. All examples in the L&F guidelines
use a drop-down menu, but don't provide code. There are example images
(maybe done with Photoshop ...), but the guidelines are not even clear
if a click (button down + button up), or already a button down should
activate the menu.

I have never coded such a thingy, but if I would have to, I would start
with a JMenu.

[J. Todd Slack]

There is an example of how to do this in the Sun Java LAF Design Guidelines.

I use it my a few of my apps.

-Jason

"Nicholas Pappas" <righ...@hotmail.com> wrote in message
news:3D7231EE...@hotmail.com...

[Nicholas Pappas]

Many thanks for the info. I looked at the LAF Guideline book homepage
but could not find the code for that drop down toolbar item.
Did you get the source out of the book? If so, I guess I'll be going to
the store later. ;)

[Thomas Weidenfeller]

Nicholas Pappas <righ...@hotmail.com> writes:
> I was wondering if there is an element, or a built in mutation of
> JComboBox (perhaps), that provided a drop down button like some programs
> have for their Undo button.

There is no magic involved, just use a button and a normal popup menu,
so that the popup behaves as adrop-down menu.

Here is some code taken from one of my applications, and simplified
(maybe to much, might not compile :-)):

//
// Create an example toolbar menu with two menu items
//
JPopupMenu ToolbarMenu = new JPopupMenu();
JMenuItem ToolbarMenuItem1 = new JMenuItem();
ToolbarMenuItem1.setText("Item 1");
ToolbarMenu.add(ToolbarMenuItem1);

JMenuItem ToolbarMenuItem2 = new JMenuItem();
ToolbarMenuItem2.setText("Item 2");
ToolbarMenu.add(ToolbarMenuItem2);

//
// Create the toolbar with one toolbar button
//
JToolBar Toolbar = new JToolBar();

// Use a text for demo purposes. In a real application an
// icon with an L&F guidelines compliant marker should be used
JButton ToolbarButton = new JButton();
ToolbarButton.setText("Toolbar Button");

//
// The event handling is not L&F guidelines compliant because
// (a) the guidelines are rather vague regarding what should
// trigger the popup menu, and
// (b) the guidelines don't allow for a default behavior, which
// is, however, rather common.
//
// The following implements:
// Right-Mouse + platform popup trigger: Pop-up the menu
// Left-Click: Default action
//
ToolbarButton.addMouseListener(new MouseAdapter() {
void postToolbarMenu(MouseEvent e) {
if(e.isPopupTrigger()) {
Component c = (Component)e.getSource();
ToolbarMenu.show(c, 0, c.getHeight());
}
}
public void mousePressed(MouseEvent e) {
postToolbarMenu(e);
}
public void mouseReleased(MouseEvent e) {
postToolbarMenu(e);
}
});
ToolbarButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
System.out.println("Default action");
}
});

Toolbar.add(ToolbarButton);

JPanel cp = (JPanel) this.getContentPane();
cp.setLayout(new BorderLayout());
cp.add(Toolbar, BorderLayout.NORTH);

/Thomas