Why "Enter" key does not fire JButton??
tszeto
I just noticed something strange. When I hit the "Enter" key, my in-focus
JButton does not fire. Clicking with my mouse works. And so does hitting the
"Space" bar.
Do I need to re-assign key-mapping? I thought the default behavior was
hitting "Enter" to fire?
Any help appreciated.
Thanks,
Ted
wrightkevin
Does this give you what you are after? -
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class TestEnter{
public static void main(String[] args){
JFrame frame = new JFrame();
Container cont = frame.getContentPane();
cont.setLayout(new FlowLayout() );
JButton button = new JButton("Click me!");
button.addActionListener( new ActionListener(){
public void actionPerformed(ActionEvent ae){
System.out.println("button was clicked");
}
});
JRootPane jf = frame.getRootPane();
cont.add(button);
JButton b1, b2, b3;
b1 = new JButton("b1");
b2 = new JButton("b2");
b3 = new JButton("b3");
cont.add(b1); cont.add(b2); cont.add(b3);
jf.setDefaultButton(button);
frame.addWindowListener( new WindowAdapter(){
public void windowClosing(WindowEvent we){
System.exit(0);
}
});
frame.setBounds(20,20,400,200);
frame.setVisible(true);
}
}
HTH
Kevin Wright.
"tszeto" <tsz...@mindspring.com> wrote in message
news:a0itjl$gea$1...@slb6.atl.mindspring.net...
tszeto
Thanks for the reply. After looking more carefully through Google, I found
what I was after. The code below lets the "Enter" key fire off any button
that's in focus.
UIManager.put("Button.focusInputMap", new UIDefaults.LazyInputMap(new
Object[] {
"ENTER", "pressed",
"released ENTER", "released"
}));
You need to place this before the buttons you initialize.
"wrightkevin" <wrigh...@ntlworld.com> wrote in message
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wrightkevin
Tried that - seems to work a treat - Thanks for the info!
Kevin Wright.
"tszeto" <tsz...@mindspring.com> wrote in message
news:a0jsa4$63d$1...@nntp9.atl.mindspring.net...
Niko Schwarz
Its not a bug... its a feature.
A button is fired when you hit space, iirc, and the key-behaviour is, so i
think, platform-specific.
even under ms-win enter does not fire a button with focus, but instead the
*standard* button. since you wont find that in java, enter doesnt do
anything with a button.
regards,
nick
--
Antonym, n.:
The opposite of the word you're trying to think of.
Christian Kaufhold
Niko Schwarz <niko.s...@gmx.net> wrote:
> Its not a bug... its a feature.
> A button is fired when you hit space, iirc, and the key-behaviour is, so i
> think, platform-specific.
Or, in Swing, LAF-specific.
> even under ms-win enter does not fire a button with focus, but instead the
> *standard* button. since you wont find that in java, enter doesnt do
> anything with a button.
Then what is JRootPane.setDefaultButton() for?
Christian
wrightkevin
Best as I can tell it allows a specific button to be allocated as the
'default button' so when you press the 'enter/return' key its registered
actionListener method fires. I'm sure more informed guys can tell
us more though!
Kevin Wright.
"Christian Kaufhold" <use...@chka.de> wrote in message
news:3t3c2dd32...@aves.chka.de...
wrightkevin
I guess I should have added to "key its registered
actionListener method fires" - irrespective of the gui's
current focus.
Kevin Wright.
"Christian Kaufhold" <use...@chka.de> wrote in message
news:3t3c2dd32...@aves.chka.de...
Christian Kaufhold
wrightkevin <wrigh...@ntlworld.com> wrote:
[JRootPane default button]
> Best as I can tell it allows a specific button to be allocated as the
> 'default button' so when you press the 'enter/return' key its registered
> actionListener method fires. I'm sure more informed guys can tell
> us more though!
It was a rhetorical question.
The "usual" key strokes seem to be "space" for choosing the currently
focused button and "enter" to choose the current default button (which
often happens to be the same than the focused one).
If you want to change this, you most likely will create incompabilities,
for example, the default button cannot be pressed at all because the
focused button also (first) reacts to the same key stroke and then
swallows it.
If the keyboard assignments provided by the LAF are unusual for the (ori-
ginal) LAF, complain at the LAF provider. If they are not, why change
them (see above)?
Christian
Christian Kaufhold
Niko Schwarz <niko.s...@gmx.net> wrote:
> Its not a bug... its a feature.
> A button is fired when you hit space, iirc, and the key-behaviour is, so i
> think, platform-specific.
Or, in Swing, LAF-specific.
> even under ms-win enter does not fire a button with focus, but instead the
> *standard* button. since you wont find that in java, enter doesnt do
> anything with a button.
Then what is JRootPane.setDefaultButton() for?
Christian
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wrightkevin
Best as I can tell it allows a specific button to be allocated as the
'default button' so when you press the 'enter/return' key its registered
actionListener method fires. I'm sure more informed guys can tell
us more though!
Kevin Wright.
"Christian Kaufhold" <use...@chka.de> wrote in message
news:3t3c2dd32...@aves.chka.de...
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Niko Schwarz
Its not a bug... its a feature.
A button is fired when you hit space, iirc, and the key-behaviour is, so i
think, platform-specific.
even under ms-win enter does not fire a button with focus, but instead the
*standard* button. since you wont find that in java, enter doesnt do
anything with a button.
regards,
nick
--
Antonym, n.:
The opposite of the word you're trying to think of.
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wrightkevin
I guess I should have added to "key its registered
actionListener method fires" - irrespective of the gui's
current focus.
Kevin Wright.
"Christian Kaufhold" <use...@chka.de> wrote in message
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Christian Kaufhold
wrightkevin <wrigh...@ntlworld.com> wrote:
[JRootPane default button]
> Best as I can tell it allows a specific button to be allocated as the
> 'default button' so when you press the 'enter/return' key its registered
> actionListener method fires. I'm sure more informed guys can tell
> us more though!
It was a rhetorical question.
The "usual" key strokes seem to be "space" for choosing the currently
focused button and "enter" to choose the current default button (which
often happens to be the same than the focused one).
If you want to change this, you most likely will create incompabilities,
for example, the default button cannot be pressed at all because the
focused button also (first) reacts to the same key stroke and then
swallows it.
If the keyboard assignments provided by the LAF are unusual for the (ori-
ginal) LAF, complain at the LAF provider. If they are not, why change
them (see above)?
Christian
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wrightkevin
Tried that - seems to work a treat - Thanks for the info!
Kevin Wright.
"tszeto" <tsz...@mindspring.com> wrote in message
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wrightkevin
So there I was (today) developing a "Print all known fonts" application.
Guess what I thought might come in handy? Answer - The ability to
designate a single button as the 'Primary button' (without regard to
the gui's current focus) sound familiar?
Am including my source code to try to convince you that the method
might have a use after all.
Interested in your thoughts.
Kevin Wright.
import javax.swing.*;
import javax.swing.text.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
public class Jtp {
static java.util.List fontList;
public static void main(String[] args) {
final JFrame frame = new JFrame();
// aha yes, this is the line!
JRootPane jr = frame.getRootPane();
final Label statusBar = new Label();
fontList = new ArrayList();
String[] ftList =
GraphicsEnvironment.getLocalGraphicsEnvironment()
.getAvailableFontFamilyNames();
for(int i=0; i<ftList.length;i++){
fontList.add(ftList[i]);
}
frame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent we) {
System.exit(0);
}
});
final JTextPane jtp = new JTextPane();
jtp.setBackground(Color.black);
jtp.setForeground(Color.white);
Container cont = frame.getContentPane();
JScrollPane jsp = new JScrollPane(jtp);
JLabel label = new JLabel("Font Size:");
final JTextField tf = new JTextField(5);
Panel topPanel = new Panel();
final Document doc = jtp.getDocument();
JButton jb = new JButton("Font Listing");
// and of course - this.
jr.setDefaultButton(jb);
JButton foreButton = new JButton("Foreground Colour");
foreButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
Color fColour = JColorChooser.showDialog(frame,
"Colour Chooser",
Color.black);
jtp.setForeground(fColour);
}
});
JButton backButton = new JButton("Background Colour");
backButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
Color bColour = JColorChooser.showDialog(frame,
"Colour Chooser",
Color.black);
jtp.setBackground(bColour);
}
});
final Style def =
StyleContext.getDefaultStyleContext()
.getStyle(StyleContext.DEFAULT_STYLE);
jb.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
statusBar.setText("Processing Fonts");
try {
doc.remove(0, doc.getLength());
for (Iterator it= fontList.iterator(); it.hasNext(); ) {
int fontSize = 12;
String currFont = (String)it.next();
try {
fontSize = Integer.parseInt(tf.getText());
} catch (NumberFormatException nfe) {
// Not really worried - carry on!
}
StyleConstants.setFontSize(def, fontSize);
StyleConstants.setFontFamily(def, currFont);
doc.insertString(doc.getLength(), currFont + "\n",
def);
jtp.setCaretPosition(0);
}
} catch (BadLocationException ble) {
System.out.println("bad location exception");
return;
}
statusBar.setText("Fonts processed!");
}
});
topPanel.add(label);
topPanel.add(tf);
topPanel.add(jb);
topPanel.add(foreButton);
topPanel.add(backButton);
cont.add(topPanel, "North");
cont.add(jsp, "Center");
cont.add(statusBar,"South");
frame.setBounds(20, 20, 530, 700);
frame.setVisible(true);
}
}
"Christian Kaufhold" <use...@chka.de> wrote in message
news:0t3c2f29b...@aves.chka.de...
Christian Kaufhold
wrightkevin <wrigh...@ntlworld.com> wrote:
> So there I was (today) developing a "Print all known fonts" application.
> Guess what I thought might come in handy? Answer - The ability to
> designate a single button as the 'Primary button' (without regard to
> the gui's current focus) sound familiar?
If you don't want the other buttons to become "default", call
setDefaultCapable(false);
> Am including my source code to try to convince you that the method
> might have a use after all.
Which method?
Actually, default button is designed (and implemented) so weakly that
it is much less useful and customizable than it could have been.
Something like what you seem to want to achieve with your code could
actually have been done more explicitly than changing all buttons that
should have *nothing* to do with it.
See http://www.chka.de/swing/laf/default-button.html
[snip code]
Christian
--
Shedding off one more layer of skin
Keeping one step ahead of the persecutor within
Bob Dylan, Jokerman