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  • How does the event dispatch thread work?

    - by Roman
    With the help of people on stackoverflow I was able to get the following working code of the simples GUI countdown (it just displays a window counting down seconds). My main problem with this code is the invokeLater stuff. As far as I understand the invokeLater send a task to the event dispatching thread (EDT) and then the EDT execute this task whenever it "can" (whatever it means). Is it right? To my understanding the code works like that: In the main method we use invokeLater to show the window (showGUI method). In other words, the code displaying the window will be executed in the EDT. In the main method we also start the counter and the counter (by construction) is executed in another thread (so it is not in the event dispatching thread). Right? The counter is executed in a separate thread and periodically it calls updateGUI. The updateGUI is supposed to update GUI. And GUI is working in the EDT. So, updateGUI should also be executed in the EDT. It is why the code for the updateGUI is inclosed in the invokeLater. Is it right? What is not clear to me is why we call the counter from the EDT. Anyway it is not executed in the EDT. It starts immediately a new thread and the counter is executed there. So, why we cannot call the counter in the main method after the invokeLater block? import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.SwingUtilities; public class CountdownNew { static JLabel label; // Method which defines the appearance of the window. public static void showGUI() { JFrame frame = new JFrame("Simple Countdown"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); label = new JLabel("Some Text"); frame.add(label); frame.pack(); frame.setVisible(true); } // Define a new thread in which the countdown is counting down. public static Thread counter = new Thread() { public void run() { for (int i=10; i>0; i=i-1) { updateGUI(i,label); try {Thread.sleep(1000);} catch(InterruptedException e) {}; } } }; // A method which updates GUI (sets a new value of JLabel). private static void updateGUI(final int i, final JLabel label) { SwingUtilities.invokeLater( new Runnable() { public void run() { label.setText("You have " + i + " seconds."); } } ); } public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { public void run() { showGUI(); counter.start(); } }); } }

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  • Accessing main class stage event listener.

    - by Hwang
    I wanted to remove an event listener from main class stage, but i get the error 1120: Access of undefined property stage. How do I actually access the stage? custom class: import main; main.disableVcam(); main class: public static function disableVcam():void { trace("disable"); stage.removeEventListener(MouseEvent.MOUSE_MOVE, movevC); }

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  • C# event handlers not thread safe?

    - by Daniel
    So i've read around that instead of calling a event directly with if (SomeEvent != null) SomeEvent(this, null); i should be doing SomeEventHandler temp = SomeEvent; if (temp != null) temp(this, null); Why is this so? How does the second version become thread safe? What is the best practice?

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  • KeyPressed Event

    - by Asim Sajjad
    My Problem is that I want to check if the Arrow up or down key is press then I want to increment or decrement value in the textbox control. I have registered keyup event but I have to release the arrow up key in order to change the value, What I want is if User pressed up arrow key then it will increment the value until user release up arrow key and same for the down arrow key. Any idea?

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  • Cross browser window close event

    - by slik
    Is there a solution for cross browser event. I need to check if user closes their window and to throw an ajax request to my database to sign them out. I've looked everyone but most cases its not working in all browsers. Anyone have a solution? Or Alternative on how to do this perhaps a conditional statement depending on the browser? Thanks!

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  • Flex, Popups: rollout event, not always working

    - by Patrick
    hi, I'm using PopupManager to create popups.. I noticed that sometimes the popups are not removed when on mouseOut event, for some reasons. I tried to roll over/out fast but the popups perfectly work. So I'm not able to say why sometimes they remain visible instead of disappear. Thanks

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  • Is transmitted bytes event exist in Linux kernel?

    - by alnet
    I need to write a rate limiter, that will perform some stuff each time X bytes were transmitted. The straightforward is to check the length of each transmitted packet, but I think it will be to slow for me. Is there a way to use some king of network event, that will be triggered by transmitted packets/bytes?

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  • CF ContextMenu - (onOpen event???)

    - by no9
    Hello ! I have a CF application. In some view i have a ContextMenu that shows OK. Is there a way to catch an event as the menu is drawn/opened? I need to do some things just as the menu is drawn, because doing it later (on menuitem click) is already too late. regards

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  • Mouse left button up event and openfiledialog

    - by phm
    I have few images in a grid, then when i click a button, a "open file dialog" comes up.(of course, over the images) Microsoft.Win32.OpenFileDialog dlgOpenFiles = new Microsoft.Win32.OpenFileDialog(); dlgOpenFile.DoModal(); The images have a LeftButtonUp event attached. The problem is that if i select a file by double clicking it, the open file dialog closes(which is good), but besides that, the image behind the clicked file is receiving a LeftButtonUp message which is not good at all. I am using wpf/c#/vs2010

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  • jQuery Mobile - how to force that page recreation - pagebeforecreate event

    - by NewUser
    I have a small jQuery mobile site. it's all single .html file it's has some edit functionality (view, edit, save) all works with ajax/json/web service Most of my pages are using data from web service, via AJAX & JSON, so I am using the following a lot: $(document).on( 'pagebeforecreate', '#monday', function() { // do some stuff on before create, load data with AJAX }); Now, how do I FORCE that page recreation (pagebeforecreate event) so the AJAX inside is run again (get the latest data from server)?

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  • Key Event Handling in Windows Services C#

    - by Yakov
    Hi! I want to create a windows service that may log pressed keys into files. For handling global key events I use hooks, hooks works great for desktop apps. But it doesn't work for the services. Is it possible to develop a windows service with key event handling? Developing on C#... Thanks for your time.

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  • Slide in/out event in N97 using J2me

    - by rajiv
    I would like to listen the slide IN/OUT event of the NOKIA devices(Touch + QWERTY Keyboard) in J2ME App. I need your inputs for the same. Do i need to follow complex implementation or is there any other way around?Will midpjni help?

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  • mouse listener event

    - by user161004
    I have got a program having an array of buttons, each of these button has their mouselistener event. Now, how can i find which of the buton is clicked through the mouse listener.

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  • Suppressing .net's updatepanel submit event handler

    - by wheresrhys
    I'm performing some custom js validation on my forms, triggered by submitting the form $("form").submit(function (e) { var validates = true; // validation code goes in here if (!validates) { e.preventDefault(); e.stopImmediatePropagation(); return false; } }) None of the lines I've included to stop the submit event prevent the .NET control posting back. Is there some way (using js or setting a property in the updatepanel control) of stopping post back?

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  • Calendar event correct PHP script

    - by Marin
    Hello everybody! I need somebody(If you have time:) ) to help me find a good Calendar event script that functions:)Please help me.Thank you in advance:) Ps:I am looking for a complete web application which will run on a WAMP environment and has a GUI based installer or minimal command line installation requirements

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