I'm wondering how can I make a Java program delay parts of code to prevent spamming buttons/other things in the program. So let's just say I'm making a program that displays the amount of times a user has clicked a button. I would like there to be a delay to the user cannot click the button rapidly. I heard that java timers could help me, but I can't find any tutorial explaining what I need done.
public void ButtonActionPerformed(java.awt.event.ActionEvent evt) {
count+=1;
labelA.setText(Integer.toString(count));
}
This is just an example program, not what im actually working on. So can someone please help me? I need to have a program create a delay so the user cannot spam buttons. Thanks :) (this is a revised question from before)
If you have a field timer of javax.swing.Timer,
private Timer timer;
you can create the instance in the constructor or a init method:
final ActionListener listener = new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
button.setEnabled(true);
}
};
timer = new Timer(2000, listener);
timer.setRepeats(false);
In this case, the delay is 2000 miliseconds before enabling the button again.
You can start it in the click event of the button.
button.setEnabled(false);
timer.start();
Save an instance variable in your action listener called long lastClicked and initialize it to 0.
in your handler:
int delay = 1000;
if(System.currentTimeMillis() > lastClicked + delay)
{
//do your click
lastClicked = System.currentTimeMillis();
}
A delay of 1000 would be 1 second.
Related
I am trying to setup a program that enables the user to display a transition when clicking the next and previous button. When pressing next, the swing timer should trigger and start the animation. When transitioning, there should be a flag that states it is in the transition period. The Swing timer should fire once every tenth of a second and essentially last 1 second.
public class guiCreation {
static Timer timer;
static boolean flag = false;
private static void guiInterface() {
next.addActionListener(new ActionListener(){
timer = new Timer(1000, this);
public void actionPerformed(ActionEvent e){
nextGest();
}
});
//should go to the next tab
previous.addActionListener(new ActionListener(){
//if the list gets to the beginning, disable button
public void actionPerformed(ActionEvent e){
prevGest();
}
});
}
public static void nextGest() {
timer.start();
previous.setEnabled(true);
next.setEnabled(true);
//if the list gets to the end, disable button
if (cardLayout.isNextCardAvailable()) {
status.setText(" Next button has been clicked");
//System.out.println("This is the" + size);
cardLayout.next(cardPanel);
next.setEnabled(cardLayout.isNextCardAvailable());
}
}
public static void prevGest() {
if (cardLayout.isPreviousCardAvailable()) {
timer.start();
next.setEnabled(true);
previous.setEnabled(true);
status.setText(" Previous button has been clicked");
cardLayout.previous(cardPanel);
previous.setEnabled(cardLayout.isPreviousCardAvailable());
}
}
}
This: "The Swing timer should fire once every tenth of a second ..." -- does not agree with this: timer = new Timer(1000, this); Your Timer is firing once every second, not every 10th of a second.
Instead, you should:
Create a new Timer(100, ...), one that fires every 10th of a second
Store in an instance field the start time in msecs when the Timer begins (likely do this in your button's ActionListener)
Within the Timer's ActionListener get the current mSecs and use this to check the elapsed time
Stop the Timer via ((Timer) e.getSource()).stop(); once 1 full second has elapsed
No need for a flag, since all you need to do is to check if the Timer isn't null and if it .isRunning(). e.g., if (timer != null && timer.isRunning()) { -- then the animation is proceeding.
Unrelated suggestion:
Get out of the static world and into the instance world. You're programming in Java, a language that is built to use OOPs from the ground up, and you don't want to fight against the OOPs paradigm.
I need to write a program that uses a swing countdown timer to do something (in this case, print out a String in the console). It gets the needed delay info from a spinner and executes the code when I hit the Start button. However, when I enter a value in the spinner, it just waits for twice that many seconds and finishes the run without printing out anything.
private void StartActionPerformed(java.awt.event.ActionEvent evt) {
int x = (int) Spinner1.getValue() * 1000;
Timer TIMER = new Timer(x, new MyActionListener());
TIMER.start();
try {
Thread.sleep(x * 2);
} catch (InterruptedException e) {
}
TIMER.stop();
}
class MyActionListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
System.out.println("Something");
}
}
Any help would be greatly appreciated!
The problem is that you are locking out yourself.
With
Thread.sleep(x * 2);
you are blocking the EventDispatchThread that would run your ActionListener. Still the timer internally keeps a flag that the timeout occured and that it should run your ActionListener at the next possible time.
But
TIMER.stop();
is resetting the TIMER, so that the notification is lost.
I have a JSlider that sets the speed of my metronome, from 40 - 200, where 120 is the default, in the middle.
When the user clicks the metronome button, the metronome plays at the speed displayed on the JSlider - the user drags the slider to the right, the speed of the metronome increases, and it decreases if they slide it to the left.
How do I add functionality so that if the user double-clicks on the JSlider button, it defaults back to 120 - in the middle?
Here is my code:
public Metronome() {
tempoChooser = new JSlider();
metronomeButton = new JToggleButton();
JLabel metText = new JLabel("Metronome:");
add(metText);
...
tempoChooser.setMaximum(200);
tempoChooser.setMinimum(40);
tempoChooser.addChangeListener(new javax.swing.event.ChangeListener() {
public void stateChanged(javax.swing.event.ChangeEvent evt) {
tempoChooserStateChanged(evt);
}
});
add(tempoChooser);
...
}
private void tempoChooserStateChanged(javax.swing.event.ChangeEvent evt) {
final int tempo = tempoChooser.getValue();
if (((JSlider) evt.getSource()).getValueIsAdjusting()) {
setMetronomeButtonText(tempo);
} else {
processTempoChange(tempo);
}
}
thanks in advance!
This should help you out: http://docs.oracle.com/javase/tutorial/uiswing/events/mouselistener.html
You need to read up on that and implement MouseListener. You can use int getClickCount() to count how many times the user has clicked, which will help you read double clicks.
Hope this helps!
Even though I dont see a question, my gues is you are looking for MouseListener.
Not simple job, you have to add javax.swing.Timer and listening if during fixed period Mouse cliked once or twice times, for example
I recently wrote something similar so I could differentiate between single and double left mouse-button clicks:
private Timer timer;
#Override
public void mouseClicked(MouseEvent e) {
if(e.getButton() == MouseEvent.BUTTON1){
if (timer == null) {
timer = new Timer();
timer.schedule(new TimerTask() {
#Override
public void run() { // timer expired before another click received, therefore = single click
this.cancel();
timer = null;
/* single-click actions in here */
}
}, (Integer) Toolkit.getDefaultToolkit().getDesktopProperty("awt.multiClickInterval"));
}
else { // received another click before previous click (timer) expired, therefore = double click
timer.cancel();
timer = null;
/* double-click actions in here */
}
}
}
I have an application which runs a timer to check for idle time and once there is no activity for 10 seconds the application will close. I have nearly 100 screens and i want to track the inactivity seconds on all the screens. Its hard for me to write the handling events in all buttons, textboxes, labelboses one by one. What i have to do is add 10 seconds on every action of the user on the application. Even if it is mousemove add 10 seconds so tat the application wont close for another 10 seconds. Is there any way to handle this effectively ?
I would suggest the following handler:
final Timer tm = new Timer(1000, new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
System.out.println("10 SECONDS AND NOTHING HAPPENED");
}
});
tm.start();
Toolkit.getDefaultToolkit().addAWTEventListener(new AWTEventListener() {
#Override
public void eventDispatched(AWTEvent event) {
tm.restart();
}
}, -1);
You could look into Toolkit.addAWTEventListener this allows you to add a MouseMotionListener to react to mouse movements throughout your app and act accordingly.
I have a dialog box that is:
JOptionPane.showMessageDialog(null,"Once medicine is given, measure temperature within 5 minutes." ,"Medication" ,JOptionPane.PLAIN_MESSAGE);
When the user presses 'ok', it goes straight to a Jframe that ask the user to input the temperature using a slider and then pressing a button that takes it to the next set of things.
Anyways, I want to create somekind of inivisble countdown after the user presses 'ok', so after 5 minutes of idleness on the Jframe menu, one warning dialog box should appear on top of the JFrame and says something like "NEED ATTENTION".
This reminds me of actionListener. but it will be invoked by non-physical element, 5 minutes, (not by any click of button).
So Maybe the code should be like:
JOptionPane.showMessageDialog(null,"Once medicine is given, measure temperature within 5 minutes." ,"Medication" ,JOptionPane.PLAIN_MESSAGE);
temperature_class temp = new temperature_class(); // going to a different class where the the Jframe is coded
if (time exceeds 5 minutes) { JOptionPane.showMessageDialog(null, "NEED attention", JOptionPane.WARNING_MESSAGE);}
else { (do nothing) }
Code works:
JOptionPane.showMessageDialog(null,"measure temp" ,"1" ,JOptionPane.PLAIN_MESSAGE);
int delay = 3000; //milliseconds
ActionListener taskPerformer = new ActionListener() {
public void actionPerformed(ActionEvent evt) {
JOptionPane.showMessageDialog(null,"hurry." ,"Bolus Therapy Protocol" ,JOptionPane.PLAIN_MESSAGE); } };
new Timer(delay, taskPerformer).start();
temperature_class temp = new temperature_class();
However, I want it do it only once. So how do I invoke set.Repeats(false)?
You could use a TimerTask with a Timer:
class PopTask extends TimerTask {
public void run() {
JOptionPane.show...
}
}
then where you want to schedule your task:
new Timer().schedule(new PopTask(), 1000*60*5);
This kind of timers can also be canceled with cancel() method
Essentially, after the initial option pane is shown, start a Timer. (A javax.swing one)
You will also need a class-level variable indicating if the temp has been entered yet.
JOptionPane.showMessageDialog(...);
tempHasBeenEntered = false;
Timer tim = new Timer(5 * 60 * 1000, new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (!tempHasBeenEntered)
JOptionPane.showMessageDialog("Hey, enter the temp!!");
}
}
tim.setRepeats(false);
tim.start();
You will need to flip the flag once a user enters a temp into the form.
Read the section from the Swing tutorial on How to Use Timers. When the dialog is displayed you start the Timer. When the dialog is closed you stop the Timer.
A Swing Timer should be used, not a TimerTask so that if the Timer fires the code will be executed on the EDT.