Popup on left click

Question

I am trying to create a popup on a button through the action listener with Java.

I have some code, but I can't get it to work, though I think I'm close! This code is from an example but for Pmenu.show, I had to remove the first arg, and I don't know what to replace it with, which seems to be the problem here.

btnOptions.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { final JPopupMenu Pmenu = new JPopupMenu(); JMenuItem menuItem = new JMenuItem("Cut"); Pmenu.add(menuItem); menuItem = new JMenuItem("Copy"); Pmenu.add(menuItem); menuItem = new JMenuItem("Paste"); Pmenu.add(menuItem); menuItem = new JMenuItem("Delete"); Pmenu.add(menuItem); menuItem = new JMenuItem("Undo"); Pmenu.add(menuItem); Point location = MouseInfo.getPointerInfo().getLocation(); Pmenu.show(null, location.getX(), location.getY()); } });

For better help sooner, post an SSCCE.

Andrew Thompson
– Andrew Thompson

2012-07-23 03:40:00 +00:00
Commented Jul 23, 2012 at 3:40 — Andrew Thompson
– Andrew Thompson, Commented Jul 23, 2012 at 3:40
Please learn java naming conventions and stick to them.

kleopatra
– kleopatra

2012-07-25 10:53:49 +00:00
Commented Jul 25, 2012 at 10:53 — kleopatra
– kleopatra, Commented Jul 25, 2012 at 10:53

Madushan · Accepted Answer · 2012-07-23 01:44:40Z

3

try passing in the instance of your window. (this).

According to the documentation, the first parameter is the

invoker - the component in whose space the popup menu is to appear

So you want to show the popup menu in the window.

answered Jul 23, 2012 at 1:44

Madushan

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4 Comments

MadProgrammer Over a year ago

just as a little clarification, the coordinates past to the invoke method are relative to the supplied component. If you supply no component reference, then the coordinates are absolute to the screen

Michael Scott Over a year ago

I literally typed in "this" (no quotes) but that didn't work.

Michael Scott Over a year ago

@Mad Programmer - I looked at that example and their code saus JDigit.this So I tried btnOptions.this but it tells me to create that class. So I tried another class, which is one of my more "main" class if you will. It was ComicDownloader.this and then .show wants me to remove the arguments.

MadProgrammer Over a year ago

JPopupMenu.show(Component invoker, int x, int y). You need to pass all three parameters. In your case I'd do something like JPopupMneu.show((Component)e.getSource(), location.getX(), location.getY());

MadProgrammer · Accepted Answer · 2012-07-26 04:13:01Z

Component source = (Component)evt.getSource(); Point location = MouseInfo.getPointerInfo().getLocation(); SwingUtilities.convertPointFromScreen(location, source Pmenu.show(source, location.getX(), location.getY());

The question that jumps out at me is "why?" Why do it this way? What is it your are trying to achieve?

UPDATE - Popup offset

This would display the popup centered horizontally against the source control (the button) and under it.

Component source = (Component)evt.getSource(); Point location = source.getLocation(); Dimension size = source.getSize(); int xPos = location.x + ((size.width - PMenu.getWidth()) / 2; int yPos = location.y + size.height; Pmenu.show(source, xPos, yPos);

This is, of course, just an example, you would be able to supply your layout information as you please

WORKING UPDATE

 Component source = (Component)evt.getSource(); Dimension size = source.getSize(); int xPos = ((size.width - Pmenu.getPreferredSize().width) / 2); int yPos = size.height; Pmenu.show(source, xPos, yPos);

Because the popup location is relative to the source, we don't need the source's location information

I have a settings button and when a user clicks it, I want a popup menu to appear. Is that what you're asking?
@MichaelScott The main reason I wanted to know, is if you only want to show the popup because of the click, you probably don't need the mouse location. You can use the position of the button (either absolutely on the screen, or relative as we've already pointed out) and display the popup, for example, under the button
Ohhh, I am going to look at all this tonight. What would that code look like?
evt is giving me an error so I had to create a variable just an fyi EventObject evt = null; Then I run the program and click the settings button but I get errors Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException at ComicDownloader$6.actionPerformed(ComicDownloader.java:712) Line 712 is this Component source = (Component)evt.getSource();

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