Updating GUI component
I have a few problems with my GUI design
First, i have a JPanel added to the JScrollPane
When I run it, the JPanel did not appear (but there is the border of JScrollPane)
Then if i click the maximize screen button on top right corner, the JPanel show up
Why is this happening? Why didn't it appear in the first time i activate it?
Second, my JPanel size is > the JScrollPane size, but the JScrollPane did not scroll despite hte fact that i have forced the scrollbar to appear. How can I get it scroll?
First of all, you should post Swing questions in the Swing forum.
I have a few problems with my GUI designOk.
>
First, i have a JPanel added to the JScrollPane
When I run it, the JPanel did not appear (but there
is the border of JScrollPane)
Then if i click the maximize screen button on top
right corner, the JPanel show up
Why is this happening? Why didn't it appear in the
first time i activate it?
Hmm, let me use my powerful telepathic skills to see what is wrong with your code.....ah, yes, the problem is in lines 75-79. Fix those.
Second, my JPanel size is > the JScrollPane size, but
the JScrollPane did not scroll despite hte fact that
i have forced the scrollbar to appear. Ok, let me concentrate again....yes, I see now that you are calculating the size wrong in lines 123 and 124.
Hope this helps.
Similar Messages
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Thread wont update GUI component
I'm developing an RMI application. I can't seem to get the gui components to show their value once their value has been set. I know the value has been set because i can retrieve it and print it out using System.out.println("Client status : " + lblYourStatus.getText());
My thread gets called when there's a Property ChangeEvent, the code executes correctly but the gui component still doesn't show the correct value.
Am i implementing the code for the thread incorrectly? or am i missing something else?
Any help would be appreciated, this has been wrecking my head for a while now.
private void jPanel1PropertyChange(java.beans.PropertyChangeEvent evt) {
System.out.println("in propertyChange()");
// lblYourStatus.setText(clientStatus);
Thread t = new Thread(this);
t.setDaemon(true);
t.start();
public void run()
// while (true)
try
SwingUtilities.invokeLater(new Runnable()
public void run()
lblYourStatus.setText(clientStatus);
System.out.println("Client status : " + lblYourStatus.getText());
catch (Exception e)
try
Thread.sleep(1000);
catch(Exception e) {}
// } //end while
}I don't think the RMI can affect it. It's the same for one client as it is for multiple clients. All the clients receive the correct values. I have been using System.out.println() statements to follow the program as it's been executing and everything seems to work as it should. I changed the code using the example you directed me to.
It still receives all the correct values but when i set the label text the gui still doesn't show the text if i pass it in as a variable eg lblPlayer1Name.setText(m_player1Name), it still shows literal values eg lblPlayer1Name.setText( "test")
I know the variable names contain valid values as i use System.out.println() statements to view them.
any more ideas? thanks for your help so far.
private void jPanel1PropertyChange(java.beans.PropertyChangeEvent evt) {
Thread t = new Thread(this);
// t.setDaemon(true);
t.start();
public void updateDetails(boolean gameInProgress, String status, String player1Name, String player2Name, int numSpectators)
m_clientStatus = m_clientStatus + status;
m_player1Name = player1Name;
m_player2Name = player2Name;
lblYourStatus.setText(m_clientStatus);
lblPlayer1Name.setText(m_player1Name);
lblPlayer2Name.setText(m_player2Name);
public void run()
// SwingUtilities makes sure code is executed in the event thread.
SwingUtilities.invokeLater(new Runnable()
public void run()
//this line wont print the value to the screen eventhough the next System.out.println() statement shows that the variable contains a valid string
lblPlayer1Name.setText(m_player1Name);
System.out.println("Player 1 variable value: " + m_player1Name);
System.out.println("Player 1 label value: " + lblPlayer1Name.getText());
lblPlayer1Name.setText(lblPlayer1Name.getText());
//this line will print the literal string "Tom" to the label
lblPlayer1Name.setText("Tom");
// simulate log running task
// try { Thread.sleep(1000); }
// catch (Exception e) {}
SwingUtilities.invokeLater(new Runnable()
public void run()
lblPlayer2Name.setText(m_player2Name);
System.out.println("Player 2 variable value: " + m_player2Name);
System.out.println("Player 2 label value: " + lblPlayer2Name.getText());
} -
Updating a GUI component from a runnable class that doesn't know that GUI
Hi. I have a problem that I think isn't solvable in an elegant way, but I'd like to get confirmation before I do it the dirty way.
My application allows the user to save (and load) his work in sessions files. I implemented this by a serializable class "Session" that basically stores all the information that the user created or the settings he made in its member variables.
Now, I obviously want the session files created by this to be as small as possible and therefore I made sure that no GUI components are stored in this class.
When the user has made all his settings, he can basically "run" his project, which may last for a long time (minutes, hours or days, depending on what the user wants to do....). Therefore I need to update the GUI with information on the progress/outcome of the running project. This is not just a matter of updating one single GUI component, but of a dynamic number of different internal frames and panels. So I'd need a reference to a GUI component that knows all these subcomponents to run a method that does the update work.
How do I do that? I cannot pass the reference to that component through the method's argument that "runs" the project, because that needs to be a seperate thread, meaning that the method is just the run() method of that thread which has no arguments (which I cannot modify if I'm not mistaken).
So the only thing I can think of is passing the reference through the constructor of the runnable class (which in turn must be stored in the session because it contains critical information on the user's work). As a result, all components that need to be incorporated in that updating process would be part of the session and go into the exported file, which is exactly what I wanted to avoid.
I hope this description makes sense...
Thanks in advance!Thanks for the quick answer! Though to be honest I am not sure how it relates to my question. Which is probably my fault rather than yours :-)
But sometimes all it takes me to solve my problem is posting it to a forum and reading it through again :)
Now I wrote a seperate class "Runner" that extends thread and has the gui components as members (passed through its constructor). I create and start() that object in the run method of the original runnable class (which isn't runnable anymore) so I can pass the gui component reference through that run method's argument.
Not sure if this is elegant, but at least it allows me to avoid saving gui components to the session file :-)
I am realizing that probably this post shouldn't have gone into the swing forum... -
Difference Between Using MVC And SwingUtilities For GUI Component Update
Hi Guys,
What are the difference of using the MVC (Model View Controler) pattern to update GUI and using the SwingUtilities of doing the same job?
Are there any big differences or shortcomings of any?
Thanks.kap wrote:
Hi Guys,
What are the difference of using the MVC (Model View Controler) pattern to update GUI and using the SwingUtilities of doing the same job?
Are there any big differences or shortcomings of any?
Thanks.Your question is akin to asking, "What's the difference between using a car to get somewhere versus stepping on the gas pedal to do the same job?"
The use of SwingUtilities to update the "view" only pertains to updating components in a thread-safe manner, it has nothing to do with MVC. MVC would govern when the view gets updated (i.e. after the model changes), while SwingUtilties would be used to specify how the view gets updated. -
A sort of KeyListener without a GUI Component?
a sort of KeyListener without a GUI Component? ( or any trick that will do)?
please be patient with my question
I can't express myself very well but it's very important.
Please help me I need an example how to implement
a way to detect some combination of keystrokes in java without
any GUI ( without AWT or Swing frames ...)
just the console (DOS or Linux shell window) or with a minimzed
java frame (awt or swing...) you know, MINIMIZED= not in focus.
in other words if the user press ctrl + alt +shift ...or some
other combination... ANYTIME ,and the java program is running in the
background, is there a way to detect that,
... my problem if I use a frame (AWT or SWING) the windows must
be in focus and NOT MINIMIZED..
if I use
someObject.addKeylistener(someComponent);
then the "someComponent" must be in focus, am I right?
What I'm coding is a program that if you highlight ANY text in
ANY OS window, a java window (frame) should pop up and match the
selected text in a dictionary file and brings me the meaning
( or a person's phone number , or
a book author ...etc.)
MY CHALLENGE IS WITHOUT PRESSING (Ctrl+C) to copy and paste
...etc. and WITHOUT MONITORING THE OS's CLIPBOARD ...I just want to
have the feature that the user simply highlight a text in ANY
window anywhere then press Ctrl+shift or some other combination,
then MY JAVA PROGRAM IS TRIGGERED and it should EMULATE SOME
KEYSTROKES OF Ctrl+C and then paste the clipboard
somewhere in my program...with all that AUTOMATION BEING in the background.
remember that my whole program ALL THE TIME MUST BE MINIMIZED AND
NOT IN FOCUS
or just running in the background (using javaw)..
is there any trick ? pleeeeeeze!!!
i'm not trying to write a sort of the spying so-called "key-logger"
purely in java but it's a very similar challenge.
please reply if you have questions
I you could please answer me , then guys this would be very
valuable technique that I need urgently. Thanks!DO NOT CROSS POST especially since this has nothing to do with game development at all. I can understand if it was in Java programming and New to Java but even then pick a forum and post it to that one and that one only.
-
Using my new GUI component in an applet :Help!!!
I am seeking help for the following
Define class MyColorChooser as a new component so it can be reused in other applications or applets. We want to use the new GUI component as part of an applet that displays the current Color value.
The following is the code of MyColorChooser class
* a) We define a class called MyColorChooser that provides three JSlider
* objects and three JTextField objects. Each JSlider represents the values
* from 0 to 255 for the red, green and blue parts of a color.
* We use wred, green and blue values as the arguments to the Color contructeur
* to create a new Color object.
* We display the current value of each JSlider in the corresponding JTextField.
* When the user changes the value of the JSlider, the JTextField(s) should be changed
* accordingly as weel as the current color.
* b)Define class MyColorChooser so it can be reused in other applications or applets.
* Use your new GUI component as part of an applet that displays the current
* Color value.
import java.awt.*;
import javax.swing.*;
import javax.swing.event.*;
import java.awt.event.*;
import java.text.DecimalFormat;
public class MyChooserColor extends JFrame{
private int red, green, blue; // color shade for red, green and blue
private static Color myColor; // color resultant from red, green and blue shades
private JSlider mySlider [];
private JTextField textField [];
// Panels for sliders, textfields and button components
private JPanel mySliderPanel, textFieldPanel, buttonPanel;
// sublcass objet of JPanel for drawing purposes
private CustomPanel myPanel;
private JButton okButton, exitButton;
public MyChooserColor ()
super( "HOME MADE COLOR COMPONENT; composition of RGB values " );
// setting properties of the mySlider array and registering the events
mySlider = new JSlider [3];
ChangeHandler handler = new ChangeHandler();
for (int i = 0; i < mySlider.length; i++)
{ mySlider[i] = new JSlider( SwingConstants.HORIZONTAL,
0, 255, 255 );
mySlider.setMajorTickSpacing( 10 );
mySlider[i].setPaintTicks( true );
// register events for mySlider[i]
mySlider[i].addChangeListener( handler);
// setting properties of the textField array
textField = new JTextField [3];
for (int i = 0; i < textField.length; i++)
{ textField[i] = new JTextField("100.00%", 5 );
textField[i].setEditable(false);
textField[i].setBackground(Color.white);
// initial Background color of each slider and foreground for each textfield
// accordingly to its current color shade
mySlider[0].setBackground(
new Color ( mySlider[0].getValue(), 0, 0 ) );
textField[0].setForeground(
new Color ( mySlider[0].getValue(), 0, 0 ) );
mySlider[1].setBackground(
new Color ( 0, mySlider[1].getValue(), 0 ) );
textField[1].setForeground(
new Color ( 0, mySlider[1].getValue(), 0 ) );
mySlider[2].setBackground(
new Color ( 0, 0, mySlider[2].getValue() ) );
textField[2].setForeground(
new Color ( 0, 0, mySlider[2].getValue() ) );
// initialize myColor to white
myColor = Color.WHITE;
// instanciate myPanel for drawing purposes
myPanel = new CustomPanel();
myPanel.setBackground(myColor);
// instanciate okButton with its inanymous class
// to handle its related events
okButton = new JButton ("OK");
okButton.setToolTipText("To confirm the current color");
okButton.setMnemonic('o');
okButton.addActionListener(
new ActionListener(){
public void actionPerformed (ActionEvent e)
{ // code permetting to transfer
// the current color to the parent
// component backgroung color
//System.exit( 0 );
// instanciate exitButton with its inanymous class
// to handle its related events
exitButton = new JButton("Exit");
exitButton.setToolTipText("Exit the application");
exitButton.setMnemonic('x');
exitButton.addActionListener(
new ActionListener(){
public void actionPerformed (ActionEvent e)
{ System.exit( 0 );
// define the contentPane
Container c = getContentPane();
c.setLayout( new BorderLayout() );
// panel as container for sliders
mySliderPanel = new JPanel(new BorderLayout());
// panel as container for textFields
textFieldPanel = new JPanel(new FlowLayout());
// panel as container for Jbuttons components
buttonPanel = new JPanel ();
buttonPanel.setLayout( new BoxLayout( buttonPanel, BoxLayout.Y_AXIS ) );
//add the Jbutton components to buttonPanel
buttonPanel.add(okButton);
buttonPanel.add(exitButton);
// add the mySlider components to mySliderPanel
mySliderPanel.add(mySlider[0], BorderLayout.NORTH);
mySliderPanel.add(mySlider[1], BorderLayout.CENTER);
mySliderPanel.add(mySlider[2], BorderLayout.SOUTH);
//add the textField components to textFieldPanel
for (int i = 0; i < textField.length; i++){
textFieldPanel.add(textField[i]);
// add the panels to the container c
c.add( mySliderPanel, BorderLayout.NORTH );
c.add( buttonPanel, BorderLayout.WEST);
c.add( textFieldPanel, BorderLayout.SOUTH);
c.add( myPanel, BorderLayout.CENTER );
setSize(500, 300);
show();
// inner class for mySlider events handling
private class ChangeHandler implements ChangeListener {
public void stateChanged( ChangeEvent e )
// start by collecting the current color shade
// for red , forgreen and for blue
setRedColor(mySlider[0].getValue());
setGreenColor(mySlider[1].getValue());
setBlueColor(mySlider[2].getValue());
//The textcolor in myPanel (subclass of JPanel for drawing purposes)
myPanel.setMyTextColor( ( 255 - getRedColor() ),
( 255 - getGreenColor() ), ( 255 - getBlueColor() ) );
//call to repaint() occurs here
myPanel.setThumbSlider1( getRedColor() );
myPanel.setThumbSlider2( getGreenColor() );
myPanel.setThumbSlider3( getBlueColor() );
// display color value in the textFields (%)
DecimalFormat twoDigits = new DecimalFormat ("0.00");
for (int i = 0; i < textField.length; i++){
textField[i].setText("" + twoDigits.format(
100.0* mySlider[i].getValue()/255) + " %") ;
// seting the textcolor for each textField
// and the background color for each slider
textField[0].setForeground(
new Color ( getRedColor(), 0, 0 ) );
mySlider[0].setBackground(
new Color ( getRedColor(), 0, 0) );
textField[1].setForeground(
new Color ( 0, getGreenColor() , 0 ) );
mySlider[1].setBackground(
new Color ( 0, getGreenColor(), 0) );
textField[2].setForeground(
new Color ( 0, 0, getBlueColor() ) );
mySlider[2].setBackground(
new Color ( 0, 0, getBlueColor() ) );
// color of myPanel background
myColor = new Color (getRedColor(),
getGreenColor(), getBlueColor());
myPanel.setBackground(myColor);
// set methods to set the basic color shade
private void setRedColor (int r){
red = ( (r >= 0 && r <= 255) ? r : 255 );
private void setGreenColor (int g){
green = ( (g >= 0 && g <= 255) ? g : 255 );
private void setBlueColor (int b){
blue = ( (b >= 0 && b <= 255) ? b : 255 );
// get methods (return the basic color shade)
private int getRedColor (){
return red ;
private int getGreenColor (){
return green;
private int getBlueColor (){
return blue;
public static Color getMyColor (){
return myColor;
// main method
public static void main (String args []){
MyChooserColor app = new MyChooserColor();
app.addWindowListener(
new WindowAdapter() {
public void windowClosing( WindowEvent e )
{ System.exit( 0 );
// inner class CustomPanel for drawing purposes
private class CustomPanel extends JPanel {
private int thumbSlider1 = 255;
private int thumbSlider2 = 255;
private int thumbSlider3 = 255;
private Color myTextColor;
public void paintComponent( Graphics g )
super.paintComponent( g );
g.setColor(myTextColor);
g.setFont( new Font( "Serif", Font.TRUETYPE_FONT, 12 ) );
DecimalFormat twoDigits = new DecimalFormat ("0.00");
g.drawString( "The RGB values of the current color are : "
+ "( " + thumbSlider1 + " , " + thumbSlider2 + " , "
+ thumbSlider3 + " )", 10, 40);
g.drawString( "The current background color is composed by " +
"the folllowing RGB colors " , 10, 60);
g.drawString( "Percentage of RED from slider1 : "
+ twoDigits.format(thumbSlider1*100.0/255), 10, 80 );
g.drawString( "Percentage of GREEN from slider2 : "
+ twoDigits.format(thumbSlider2*100.0/255), 10, 100 );
g.drawString( "Percentage of BLUE from slider3 : "
+ twoDigits.format(thumbSlider3*100.0/255), 10, 120 );
// call to repaint occurs here
public void setThumbSlider1(int th){
thumbSlider1 = (th >= 0 ? th: 255 );
repaint();
public void setThumbSlider2(int th){
thumbSlider2 = (th >= 0 ? th: 255 );
repaint();
public void setThumbSlider3(int th){
thumbSlider3 = (th >= 0 ? th: 255 );
repaint();
public void setMyTextColor(int r, int g, int b){
myTextColor = new Color(r, g, b);
repaint();
//The following method is used by layout managers
public Dimension getPreferredSize()
{ return new Dimension( 150, 100 );
The following is the code of application that tests the component
//Application used to demonstrating
// the homemade GUI MyChooserColor component
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
public class ShowMyColor extends JFrame {
private JButton changeColor;
private Color color = Color.lightGray;
private Container c;
MyChooserColor colorComponent;
public ShowMyColor()
{ super( "Using MyChooserColor" );
c = getContentPane();
c.setLayout( new FlowLayout() );
changeColor = new JButton( "Change Color" );
changeColor.addActionListener(
new ActionListener() {
public void actionPerformed( ActionEvent e )
{ colorComponent = new MyChooserColor ();
colorComponent.show();
color = MyChooserColor.getMyColor();
if ( color == null )
color = Color.lightGray;
c.setBackground( color );
c.repaint();
c.add( changeColor );
setSize( 400, 130 );
show();
public static void main( String args[] )
{ ShowMyColor app = new ShowMyColor();
app.addWindowListener(
new WindowAdapter() {
public void windowClosing( WindowEvent e )
{ System.exit( 0 );Yes, I want help for the missing code to add in actionPerformed method below. As a result, when you confirm the selected color (clicking the OK button), it will be transferred to a variable color of class ShowMyColor.
// instanciate okButton with its inanymous class
// to handle its related events
okButton = new JButton ("OK");
okButton.setToolTipText("To confirm the current color");
okButton.setMnemonic('o');
okButton.addActionListener(
new ActionListener(){
public void actionPerformed (ActionEvent e)
{ // code permetting to transfer
// the current color to the parent
// component backgroung color
//System.exit( 0 );
); -
Accessing a gui component directly via getSource()
Hi,
to access a gui component I can access it by getting its object variable and casting it to its class type, e.g.:
public class Tab02 extends JFrame {
JTable tab = new JTable (rows, head);
JTextField txt = new JTextField ("dimensions");
JTree tree = new JTree(node.getRoot());
class DragDropNode implements TreeSelectionListener, MouseMotionListener, MouseListener {
public void mouseDragged (MouseEvent me ) {
Cursor dragcurs = new Cursor(13);
// me.getSource().setCursor (mdragcurs) does not work as getSource delivers an object type
JTree tmp = (JTree)me.getSource();
// me.getSource().setCursor (mdragcurs)
tmp.setCursor (mdragcurs); // as me.getSource().setCursor (mdragcurs)
JTable tmp = (JTable )me.getSource();
tmp.setCursor (mdragcurs);
How can I cast the object automatically to the genuine type?
Is there a method that returns the type and I can use this method to cast me.getSource()?
ThanksNavigate to the folder enclosing it and enter Library in the Go to Folder command.
(70632) -
(paid support) Pacman Update GUI
Below the project description. If you are interested in doing this programming job, please email/pm me.
If there are questions, please reply to this post.
Pacman Update GUI
Archlinux (http://www.archlinux.org/) uses the pacman package manager. A number of GUI applications to control this package manager exist (http://wiki.archlinux.org/index.php/Pac … _Frontends), but none suit our needs.
For this project you will need to design and implement two independent GTK+ applications: an Update Manager and an Update Applet. The Update Manager must be an application that guides the user through updating the system. The Update Applet must be an application which shows a systray icon. This application will check for updates once in a while and notify the user if there are updates.
Both applications must be internationalized/localized and written in C, C++ or Python. The applications should have as little dependencies as possible. The applications must include installation scripts. The applications must be installed in compiled form. Any configuration needed for these tools should be systemwide. We do not need a gui for configuration.
Update Manager
The Update Manager must be an application that guides the user through the steps of updating the system with as little effort and as little user interaction as possible. You are expected to first define the minimal amount of steps required, design the application and then implement the application (gui and internals).
There are two possibilities for this applications:
1. You develop it from scratch.
2. You modify the gnome update manager (used in eg ubuntu) to work with pacman.
We will rely on your expertise to decide which approach is best.
Update Applet
The Update Applet provides a systray icon which checks for system updates in regular intervals. The applet should have a tooltip showing the update status, and a context menu with a few options, such as "Check for updates now", "About" and "start Update Manager". You are expected to design and implement the application.I don't get why you should allow your users to update their OS(that is their GUI, their kernel, xorg, libc and other _core_ functionality). These components are already quite "great" and shouldn't need upgrading if that is your worry. Only in the case of some new device coming out and the kernel or xorg need to support it i can see the problem. This should happen very rarely though. I mean, why should you allow your OS to be upgraded by some lowly non-tech users. I don't know of many workplaces which allow their users to upgrade their windows versions for example...
You could always upgrade the OS every X years if needed.
If the boss wants his emplyees to be able to download whichever apps/games they want then ofcourse you could allow this, but this should only be allowed if said apps/games doesn't drag in new versions of xorg, kernel versions or other core functionality or its dependencies.
Just blacklist these in pacman.conf and make the file unwritable for the users...
This way you only need external repo for apps which doesn't install without user intervention.
Here i define "core functionality" as all the code responsible for giving a "working computer" as defined by the boss and you if he's not very IT. If you are worried about security and this is why you want a constantly updating machine then just connect all the machines to a router/firewall before they are allowed onto the net. That one could be an arch machine...
Also I haven't tried xfce in a long while but you should watch against giving "windows users/mac users" anything which isn't glitzy and full-featured, because if the users doesn't think the OS have all the functionality they "need" and they don't think it looks fancy enough they have a tendency to go back to whatever OS they came from or try to "upgrade" their own os... which might spell problems for you.
You know, never underestimate the ingeniousness of an idiot.
Just my 5 cents.
Last edited by test1000 (2010-06-25 00:13:42) -
Changing prod order quantity no update of component qty (during convertion)
Hello everybody,
I would like to ask you if someone has already founded following problem :
I converted a planned order into a production order and, before to save it, I changed the production order header quantity. In this particular conditions the system doesn't udate the component quantity also after the order is saved ! The result is to have not the same proportion as in BOM. I have no founded any OSS note. Have anyone of you founded this kind of problem ?
Is it a SAP std behavior ?
Thanks in advance
Salvatore TestaSalvatore-
Standard would be, that if you change the header quantity in the production order, it will update the components quantity too. I don't see a reason why it is not updating the component quantity.
Shail -
HI all, I'm writing a program and I wish to use a gui component but I don't know what it is called and I was wondering if any of you could help.
Its kind of like a text area but the text is separated into columns and each of the columns have headings. Each of the headings can be extended to show more of the text. It's like in microsoft windows when you view files showing all their detail and you get the headings name, size, date created etc.
Any help on this matter would be greatly appreciated.
ThanksIt's not a jTable as that is more like a spreadsheet, it's similar but the edges of the cells aren't visible in what i'm talking about. and also what i'm after has 'tabs' at the top with headings in. If anyone uses a peer to peer file sharing application, its like what the results of a search are displayed in.
Thanks for the help but if anyone has any more ideas they are very welcome -
Calling a GUI component form jbase program
Hello all,
I have created a GUI component in Java. When I run it form DOS prompt its works fine,
but when I call it form a Jbase subroutine the GUI is never displayed....the component runs in the background but for some reason its not visible.....plz help....
Ankit.I am facing the same problem It calls the AWT but doesnt display it. Please help Thanks
Divesh -
Is it safe to use SwingUtilities.invokeLater(), while updating GUI?
Hi,
I am updating GUI components in synchronized block which is runinng on main() thread my application hangs, but if I use SwingUtilities.invokeLater(...) then it runs fine.
My question is:
Is it safe to use SwingUtilities.invokeLater(...) in synchronized block.
Edited by: Amol_Parekh on Nov 1, 2007 1:28 AMPaul Hyde in his "Java Thread Programming" (great book!!!) says it is.
With invokeLater() you say to the Thread Scheduler you want that code to run on the Swing thread. In fact, if that is the only thing you do in the synchronized block I think it is unnecessary.
Greetings,
astrognom -
Help - Bean Binding an SQL join to a gui component(jtable) in Netbeans?
Good afternoon. I'd like to ask if there is a way to data bind an SQL Join from 2 or more tables to a
GUI component(Jtable) in Netbeans. All the tutorials show is how to bind all the fields of 1 database table
to the component. Under the BIND/ELements option the IMPORT DATA TO FORM menu only allows
you to choose 1 among the database tables from a selected database.
Is there a way to configure an SQL query and attach it to the component?
Thanks.This is not a Swing problem. Try a NetBeans forum.
-
Trying to create Netbeans Swing/GUI component
Hello,
I'm trying to create a GUI component from the following code. The main idea is to create a component consisting of a checkbox and a panel. The panel can contain several other swing components. By checking or unchecking the checkbox I want all by components in the panel to be enabled or disabled.
The important thing is that this component should work in the Netbeans GUI designer. I'm using Netbeans 5.5.
My problem is the following:
When adding my swing component to the Netbeans swing component palette and dragging onto a new form, I cannot assign other components to the main panel of my component. Even if I use the Inspector tree to drag components to be children of my component, the mouse icon shows a denying icon.
If I add swing components programmatically, it works.
Can somebody give me an advice what I should change in my code to make it work with the Netbeans GUI designer?
Below you can find the current code of my standalone component. It includes a main() method so one can give it a try.
Many thanks in advance!
package test.swing;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class JEnabler extends JPanel {
private JCheckBox checkEnabler = new JCheckBox();
private JPanel contentPane = new JPanel();
public JEnabler() {
super.setLayout(new BorderLayout());
checkEnabler.setSelected(true);
checkEnabler.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
checkEnabler.setMargin(new Insets(0, 0, 0, 0));
checkEnabler.setVerticalAlignment(SwingConstants.TOP);
checkEnabler.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
checkEnablerActionPerformed(evt);
super.addImpl(checkEnabler, BorderLayout.WEST, -1);
super.addImpl(contentPane, BorderLayout.CENTER, -1);
private void checkEnablerActionPerformed(ActionEvent evt) {
Component[] list = contentPane.getComponents();
for (int i=0; i<list.length; i++)
list.setEnabled(checkEnabler.isSelected());
protected void addImpl(Component comp, Object constraints, int index) {
contentPane.add(comp, constraints, index);
public LayoutManager getLayout() {
return contentPane.getLayout();
public void setLayout(LayoutManager mgr) {
if (contentPane!=null)
contentPane.setLayout(mgr);
public void remove(Component comp) {
contentPane.remove(comp);
public void remove(int index) {
contentPane.remove(index);
public void removeAll() {
contentPane.removeAll();
public static void main(String args[]) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JEnabler enabler = new JEnabler();
JTextField tf = new JTextField("Test");
enabler.add(tf);
JButton test = new JButton("Click");
enabler.add(test);
frame.getContentPane().add(enabler);
frame.pack();
frame.setVisible(true);Can anyone tell me what I am missing?
public void paintComponents(Graphics g)you're not 'missing' anything, in fact you've gained an 's' -
How to get change a GUI component from another class?
Hi there,
I'm currently trying to change a GUI component in my 'Application' class from my 'Dice' class.
So the Application class sets up some GUI including a JLabel that initially displays "Change".
The 'Dice' class contains the ActionPerformed() method for when the 'Change' button (made from Application class) is clicked.
And it returns an 'int' between 1 and 6.
Now I want to set this number back int he JLabel from the Application class.
APPLICATION CLASS
import javax.swing.*;
import java.awt.*;
import java.util.Random;
import java.awt.event.*;
public class Application extends JFrame implements ActionListener{
public JPanel rollDicePanel = new JPanel();
public JLabel dice = new JLabel("Loser");
public Container contentPane = getContentPane();
public JButton button = new JButton("Change");
public Dice diceClass = new Dice();
public Application() {}
public static void main(String[] args)
Application application = new Application();
application.addGUIComponents();
public void addGUIComponents()
contentPane.setLayout(new BorderLayout());
rollDicePanel.add(dice);
button.addActionListener(diceClass);
contentPane.add(rollDicePanel, BorderLayout.SOUTH);
contentPane.add(button,BorderLayout.NORTH);
this.setSize(460, 655);
this.setVisible(true);
this.setResizable(false);
public void changeDice()
dice.setText("Hello");
public void actionPerformed(ActionEvent e) {}
}DICE
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class Dice implements ActionListener
public Dice() {}
public void actionPerformed(ActionEvent e)
//super.actionPerformed(e);
String event = e.getActionCommand();
if(event.equals("Change"))
System.out.println("Will be about to change the 'dice' label");
Application application = new Application();
application.dice.setText("Hello");
}It's all about references, baby. The Dice object needs a way to communicate with the Application object, and so Dice needs a reference to Application. There are many ways to pass this. In my example I pass the application object directly to Dice, but a better way would use interfaces and some indirection. Look up the Observer pattern for a better way to do this that scales much better than my brute-force approach.
import javax.swing.*;
import java.awt.*;
public class Application extends JFrame // *** implements ActionListener
// *** make all of these fields private ***
private JPanel rollDicePanel = new JPanel();
private JLabel dice = new JLabel("Loser");
private Container contentPane = getContentPane();
private JButton button = new JButton("Change");
// *** pass a reference to your application ("this")
// *** to your Dice object:
private Dice diceClass = new Dice(this);
public Application()
public static void main(String[] args)
Application application = new Application();
application.addGUIComponents();
public void addGUIComponents()
contentPane.setLayout(new BorderLayout());
rollDicePanel.add(dice);
button.addActionListener(diceClass);
contentPane.add(rollDicePanel, BorderLayout.SOUTH);
contentPane.add(button, BorderLayout.NORTH);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setPreferredSize(new Dimension(460, 655));
pack();
setLocationRelativeTo(null);
setVisible(true);
setResizable(false);
// *** I'm not sure what this is supposed to be doing, so I commented it out.
//public void changeDice()
//dice.setText("Hello");
// *** ditto. I strongly dislike making a GUI class implement ActionListeenr
//public void actionPerformed(ActionEvent e)
// *** here's the public method that the Dice object calls
public void setTextDiceLabel(String text)
dice.setText(text);
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class Dice implements ActionListener
// *** have a variable that holds a reference to your application object
private Application application;
private boolean hello = true;
public Dice(Application application)
// *** get that reference via a constructor parameter (one way to do this)
this.application = application;
public void actionPerformed(ActionEvent e)
String event = e.getActionCommand();
if (event.equals("Change"))
System.out.println("Will be about to change the 'dice' label");
if (hello)
// *** call the application's public method
application.setTextDiceLabel("Hello");
else
application.setTextDiceLabel("Goodbye");
hello = !hello;
//Application application = new Application();
//application.dice.setText("Hello");
}
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