I have few issues with my swing app which looks like this app preview
This Frame is defined in Form class.
Form class is building in main class, code below
public class Main {
public static void main(String[] args) {
Form form = new Form();
checkIfRunning();
}
"New doctor" button has it's own listener which check is this object is already exist. Listener is defined in Form class.
newDoctorButton.addActionListener(new ActionListener() {
private NDoctor dc = null;
#Override
public void actionPerformed(ActionEvent e) {
if (dc == null){
dc = new NDoctor();}
else dc.toFront();
}
});
Everything works fine, new window is opening as i want. second window preview
"Ok" button listener below
okButton.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
NDoctor.super.dispose();
}
});
When i close it i cant open it once more.
Im sure the problem is in the main method. The "New Doctor"listener works but in run only once, when i close window it wont start until i call main method again, but this will create next Frame.
I hope you understand my problem. I will be grateful for any advice.
Related
I am coding a module for Netbeans where I have a button that when clicked will open a JFrame.
This is the action listener class of the button:
// ... (package and imports)
#ActionID(
category = "File",
id = "org.myorg.readabilitychecker.ReadabilityActionListener"
)
#ActionRegistration(
iconBase = "org/myorg/readabilitychecker/google.png",
displayName = "#CTL_ReadabilityActionListener"
)
#ActionReference(path = "Toolbars/File", position = 0)
#Messages("CTL_ReadabilityActionListener=Readability")
public final class ReadabilityActionListener implements ActionListener {
#Override
public void actionPerformed(ActionEvent e) {
JFrame readabilityFrame = new ReadabilityFrame();
readabilityFrame.setVisible(true);
}
}
In the JFrame I basically have:
public static void main(String args[]) {
* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new ReadabilityFrame().setVisible(true);
}
});
}
It also has some other automatically generated code, but nothing important.
When I run the application, the button appears in the toolbar, but when I click it, the JFrame doesn't open.
I tried checking if a print inside the actionPerformed() method would show in the output terminal and it does, so I guess that I am missing something while calling the JFrame.
Can anyone give me a hint on where the problem is?
I think the issue is with the object creation of your frame. Try
ReadabilityFrame readabilityFrame = new ReadabilityFrame();
readabilityFrame.setVisible(true);
Hope it helps.
I found where was the problem.
The method initComponents() automatically generated had the line setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); and it was always throwing an exception.
I just changed EXIT_ON_CLOSE to DISPOSE_ON_CLOSE, defined the frame in a different way and now, the problem disappeared.
We have an applet code below. where we have specified a button and when the button is clicked it should open a new website. Yahoo website in this case. The code for the applet is below
public class GotoLinkApplet extends Applet implements ActionListener{
public void init()
{
String link="yahoo";
Button b=new Button(link);
b.addActionListener(this);
add(b);
}
#Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
System.out.println("1");
Button src= (Button)e.getSource();
String link="http://www."+src.getLabel()+".com";
try{
AppletContext a=getAppletContext();
URL url =new URL(link);
//a.showDocument(url, "_self");
a.showDocument(url, "_blank");
System.out.println("a");
}
catch(MalformedURLException ae)
{
System.out.println(ae.getMessage());
}
}
}
We executed the above code in eclipse,but when we click on the button, the yahoo link is not coming up. Request you to help. But the code that specifies showdocument runs fine.
Any help on the above is much appreciated.
This should be possible using Desktop.browse(uri);
You'll of course want to make sure the Desktop is supported first.
I have my GUI set up so that if the button b1 is pressed:
public class CubeCalc {
static int next = 0;
public static void MakeTitlePage()
{
final JFrame window = new JFrame("Cubic Feet Calculator"); //Creates Frame
JButton b1 = new JButton("Start");
b1.setBackground(Color.decode("#5A20DF"));
b1.setForeground(Color.WHITE);
/*b1.setLayout(new GridBagLayout());*/
b1.setPreferredSize(new Dimension(150,50));
b1.addActionListener(new ActionListener() { // action when button is pressed
int pressCount=0;
#Override
public void actionPerformed(ActionEvent e) {
window.dispose();
next = 1;
}
});
then it will dispose of the title page and and next will equal one, and on the Event Dispatch Thread, it creates a new page that does other things:
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() { // launch frame on the Event Dispatch Thread
#Override
public void run() {
MakeTitlePage();
if (next==1)
{
MakeCalcPage();
}
System.out.println(next);
}
});
}
The problem is that the variable next remains equal to zero even though I have changed it in the method MakeTitlePage(). How do I change the variable across all the methods, and not just that one?
I think you might have misunderstood how the event dispatch thread works. When you add a listener to a component then you are telling Swing to listen for certain events and invoke the associated listener on the event dispatch thread. If you are using the static variable next to communicate between threads then, firstly, that's not the way to do it and, secondly, you are communicating to the same thread anyway.
If you want the button to close the current window and open a new one then you should do that directly in the actionPerformed method:
public void actionPerformed(ActionEvent e) {
window.setVisible(false);
showCalculationFrame();
}
I am working on a project in which I would like to close a generic JOptionPane programmatically (by not physically clicking on any buttons). When a timer expires, I would like to close any possible JOptionPane that may be open and kick the user back to the login screen of my program. I can kick the user back just fine, but the JOptionPane remains unless I physically click a button on it.
I have looked on many sites with no such luck. A doClick() method call on the "Red X" of the JOptionPane does not seem possible, and using JOptionpane.getRootFrame().dispose() does not work.
Technically, you can loop through all windows of the application, check is they are of type JDialog and have a child of type JOptionPane, and dispose the dialog if so:
Action showOptionPane = new AbstractAction("show me pane!") {
#Override
public void actionPerformed(ActionEvent e) {
createCloseTimer(3).start();
JOptionPane.showMessageDialog((Component) e.getSource(), "nothing to do!");
}
private Timer createCloseTimer(int seconds) {
ActionListener close = new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
Window[] windows = Window.getWindows();
for (Window window : windows) {
if (window instanceof JDialog) {
JDialog dialog = (JDialog) window;
if (dialog.getContentPane().getComponentCount() == 1
&& dialog.getContentPane().getComponent(0) instanceof JOptionPane){
dialog.dispose();
}
}
}
}
};
Timer t = new Timer(seconds * 1000, close);
t.setRepeats(false);
return t;
}
};
This code gotten from
https://amp.reddit.com/r/javahelp/comments/36dv3t/how_to_close_this_joptionpane_using_code/ seems to be the best approach to me. It involves Instantiating the JOptionPane class rather that using the static helper methods to do it for you. The benefit is you have a JOptionPane object that you can dispose when you want to close the dialog.
JOptionPane jop = new JOptionPane();
jop.setMessageType(JOptionPane.PLAIN_MESSAGE);
jop.setMessage("Hello World");
JDialog dialog = jop.createDialog(null, "Message");
// Set a 2 second timer
new Thread(new Runnable() {
#Override
public void run() {
try {
Thread.sleep(2000);
} catch (Exception e) {
}
dialog.dispose();
}
}).start();
dialog.setVisible(true);
I'm trying to figure out how to make it so that my navigation menu, when clicked, will open appropriate panels within my GWT page.
Here's a part of my code:
#Override
public void onModuleLoad()
{
MainNavBar nb = new MainNavbar();
NavItem i = new NavItem("1", "TestNavItem");
nb.add(i);
i = new NavItem("2", "TestNavItem2");
nb.add(i);
}
So when I run the project, I see that I have a menu on the test site:
So my question is, how can I have an event handler such that when either one of those are clicked, the panel to the right will be changed to something else?
Thanks!
create an actionListener class,
public class listen implements actionListener{
public void actionPerformed(ActionEvent e){
if(e.getSource() == ObjectName){
// Your code goes here....
}
}
}
then create an object of this class e.g
listen listener = new listen();
YourObjectName.addActionListener(listener);
Don't forget to make the imports, hope this helps...