JDialog and JButton Focus acting strange.

[Jeff Sadowski]

Maybe I'm not using things correctly but I'm having issues with setting focus.
Here is test code that is giving me the problem.

import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
import java.net.*;
import java.io.*;
public class Buttontest
{
static JDialog frame;
static public class ButtonListener implements ActionListener{
public void actionPerformed(ActionEvent e)
{
System.out.println(e.getActionCommand());
frame.dispose();
}
}
public static void main(String[] args) throws Exception
{
JButton button;
JButton focused_button;
Container content;
ButtonListener listener;
OutputStreamWriter writer;
/*
* Wait for connection to port before continuing.
*/
writer = new OutputStreamWriter((new ServerSocket(8080)).accept().getOutputStream());
writer.write("Started ButtonTest");
writer.close();
listener = new ButtonListener();
frame = new JDialog();
content = frame.getContentPane();
content.setLayout(new FlowLayout());
button = new JButton("one");
button.addActionListener(listener);
content.add(button);
focused_button = new JButton("two");
focused_button.addActionListener(listener);
content.add(focused_button);
frame.setSize(200, 80);
frame.setVisible(true);
frame.setAlwaysOnTop(true);
frame.toFront();
frame.requestFocus();
focused_button.grabFocus();
}
}

Running in Windows 7
when I run the program from one command line then invoke it (ie: http://127.0.0.1:8080 in a web browser)
It brings up the dialog box but not focused.
How can I get it to be focused?

Second problem is the focused button when I focus the window I expect enter key to do the same as pressing the focused button but this is not happening. Do I need another action listener on the JDialog to do this?

(I edited the code to run more cleanly on the connected web browser)

[Jason Bullers]

From the javadoc (emphasis mine):

Requests that this Component get the input focus, and that this Component's top-level ancestor become the focused Window. This component must be displayable, visible, and focusable for the request to be granted.
This method is intended for use by focus implementations. Client code should not use this method; instead, it should use requestFocusInWindow().

Call requestFocusInWindow() before you call setVisible() and it should work fine, I think. I'm not sure about the issue with pressing enter. I think that should generate an action event. You could try registering your focused_button as the default button for your container: frame.getRootPane().setDefaultButton(focused_button); On Windows, I believe that should treat the button as the target for hitting enter, even if it doesn't have focus.

[Darryl Burke]

Moving to the GUI forum.

[Jeff Sadowski]

 

Jason Bullers wrote:From the javadoc (emphasis mine):

Call requestFocusInWindow() before you call setVisible() and it should work fine, I think.

Seems to work the same.

Jason Bullers wrote:
I'm not sure about the issue with pressing enter. I think that should generate an action event. You could try registering your focused_button as the default button for your container: frame.getRootPane().setDefaultButton(focused_button); On Windows, I believe that should treat the button as the target for hitting enter, even if it doesn't have focus.

It did select the button when I pressed enter; however instead of setting it to one button is there a way to have the focused button (not my button I named focused_button but which ever button is focused) to be activated when the enter key is pressed.

Thank you your some suggestions.

[Darryl Burke]

 

is there a way to have the focused button (not my button I named focused_button but which ever button is focused) to be activated when the enter key is pressed.

Check out Rob Camick's article on Enter Key and Button.