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  • Adding Events To WinForms?

    - by Soo
    Happy Friday! :D I have a TextBox on a WinForm and I want to execute some code every time someone presses a key inside of that TextBox. I'm looking at the events properties menu, and see the "KeyDown" event, but don't know how to add code to it. Happy coding

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  • Is it possible to capture mouse events on a scroll bar in JavaScript

    - by Nathan
    I have an HTML element with overflow: scroll. The click event listener registered with the element is triggered when I click on the element, but not when I click on the scroll bar for the element. Is it possible to capture mouse events which occur on an HTML element's scroll bar? The reason I want to do this is to make a visual popup element disappear when ever a click event occurs anywhere outside the popup element.

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  • What are lightweight events?

    - by Vitali Climenco
    Ran a handful of times into the term lightweight event. The texts were not accompanied by any code snippets to figure out the idea behind the term. I would really appreciate it if anyone could explain what are lightweight events about and throw in an example.

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  • Where to wire up events?

    - by Jeffrey Cameron
    I'm using Ninject (1.5 ... soon to be 2) and I'm curious how other people use Ninject or other IoC containers to help wire up events to objects? It seems to me in my code that I'm doing it herky-jerky all over the place and would love some advice on how to clean it up a bit.

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  • waiting for 2 different events in a single thread

    - by João Portela
    component A (in C++) - is blocked waiting for alarm signals (not relevant) and IO signals (1 udp socket). has one handler for each of these. component B (java) - has to receive the same information the component A udp socket receives. periodicaly gives instructions that should be sent through component A udp socket. How to join both components? it is strongly desirable that: the changes to attach component B to component A are minimal (its not my code and it is not very pleasent to mess with). the time taken by the new operations (usually communicating with component B) interfere very little with the usual processing time of component A - this means that if the operations are going to take a "some" time I would rather use a thread or something to do them. note: since component A receives udp packets more frequently that it has component B instructions to forward, if necessary, it can only forward the instructions (when available) from the IO handler. my initial ideia was to develop a component C (in C++) that would sit inside the component A code (is this called an adapter?) that when instanciated starts the java process and makes the necessary connections (that not so little overhead in the initialization is not a problem). It would have 2 stacks, one for the data to give component B (lets call it Bstack) and for the data to give component A (lets call it Astack). It would sit on its thread (lets call it new-thread) waiting for data to be available in Bstack to send it over udp, and listen on the udp socket to put data on the Astack. This means that the changes to component A are only: when it receives a new UDP packet put it on the Bstack, and if there is something on the Astack sent it over its UDP socket (I decided for this because this socket would only be used in the main thread). One of the problems is that I don't know how to wait for both of these events at the same time using only one thread. so my questions are: Do I really need to use the main thread to send the data over component A socket or can I do it from the new-thread? (I think the answer is no, but I'm not sure about race conditions on sockets) how to I wait for both events? boost::condition_variable or something similar seems the solution in the case of the stack and boost::asio::io_service io_service.run() seems like the thing to use for the socket. Is there any other alternative solution for this problem that I'm not aware of? Thanks for reading this long text but I really wanted you to understand the problem.

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  • How to load dynamic events in Flex

    - by user309010
    Hi All, I have a small flex application. What I want to achieve is, I want my user to pass the script as a parameter. so he has the flexibility to do anything with the buttons-like add event, hide the other buttons. Something like this(below) <param name="script" value="import flash.events.Event;\n private function printMessage(event:Event):void {\nmessage.text += event.target.label + " pressed" + "\n";\n}"> Thanks.

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  • Strategy for wiring up events?

    - by Jeffrey Cameron
    I'm using Ninject (1.5 ... soon to be 2) and I'm curious how other people use Ninject or other IoC containers to help wire up events to objects? It seems to me in my code that I'm doing it herky-jerky all over the place and would love some advice on how to clean it up a bit. What are people doing out there to manage this?

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  • Custom Control Events in C#

    - by pm_2
    I'm trying to create a custom control and need to raise an event from it. The idea is to raise an event at the end of the click event (OnAfterClick). I found one or two tutorials on doing this, but am clearly missing a step somewhere; I have the following. In the control: public class AfterClickEventArgs : EventArgs { ... } public partial class MyButton : CommandButton { public delegate void AfterClickEvnt(object sender, AfterClickEventArgs e); public event AfterClickUpdatedEvnt AfterClick; } protected override void OnClick(EventArgs e) { ... Processing here ... AfterClickEventArgs myArgs = new AfterClickEventArgs(); AfterClick(this, newArgs); } In the program using the control: In InitializeComponent(): this.MyButton.AfterClick += new System.EventHandler(this.cmdMyButton_Click); This line is giving me a compile error (cmdMyButton_Click does exist). It tells me: Cannot implicitly convert type 'System.EventHandler' to 'Namespace.MyButton.AfterClick' Can anyone tell me what I'm missing, or misunderstanding about this, please?

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  • Where to register for C# events?

    - by themaninthesuitcase
    I am currently transitioning from VB to C# and am having some issues with regards to registering my interest in an event. When using VB it was simply a case of specifying that a method Handles and event, often this was generated by using the object events list. While I can easily use the Class.event += delegate in C# I am unsure where the best place is to place the code to do this. Am I best placing it inside of the InitializeComponent() as per the generated code (say if you select the event in the from designer) or should I place it inside the constructor for better readability/maintenance. If inside the constructor, should it be before or after the call to InitializeComponent()?

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  • C# Delegate under the hood question.

    - by Ted
    Hi Guys I was doing some digging around into delegate variance after reading the following tquestion in SO. "delegate-createdelegate-and-generics-error-binding-to-target-method" (sorry not allowed to post more than one hyperlink as a newbie here!) I found a very nice bit of code from Barry kelly at https://www.blogger.com/comment.g?blogID=8184237816669520763&postID=2109708553230166434 Here it is (in a sugared-up form :-) using System; namespace ConsoleApplication4 { internal class Base { } internal class Derived : Base { } internal delegate void baseClassDelegate(Base b); internal delegate void derivedClassDelegate(Derived d); internal class App { private static void Foo1(Base b) { Console.WriteLine("Foo 1"); } private static void Foo2(Derived b) { Console.WriteLine("Foo 2"); } private static T CastDelegate<T>(Delegate src) where T : class { return (T) (object) Delegate.CreateDelegate( typeof (T), src.Target, src.Method, true); // throw on fail } private static void Main() { baseClassDelegate a = Foo1; // works fine derivedClassDelegate b = Foo2; // works fine b = a.Invoke; // the easy way to assign delegate using variance, adds layer of indirection though b(new Derived()); b = CastDelegate<derivedClassDelegate>(a); // the hard way, avoids indirection b(new Derived()); } } } I understand all of it except this one (what looks very simple) line. b = a.Invoke; // the easy way to assign delegate using variance, adds layer of indirection though Can anyone tell me: how it is possible to call invoke without passing the param required by the static function. When is going on under the hood when you assign the return value from calling invoke What does Barry mean by extra indirection (in his comment)

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  • c# delegate and abstract class

    - by BeraCim
    Hi all: I currently have 2 concrete methods in 2 abstract classes. One class contains the current method, while the other contains the legacy method. E.g. // Class #1 public abstract class ClassCurrent<T> : BaseClass<T> where T : BaseNode, new() { public List<T> GetAllRootNodes(int i) { //some code } } // Class #2 public abstract class MyClassLegacy<T> : BaseClass<T> where T : BaseNode, new() { public List<T> GetAllLeafNodes(int j) { //some code } } I want the corresponding method to run in their relative scenarios in the app. I'm planning to write a delegate to handle this. The idea is that I can just call the delegate and write logic in it to handle which method to call depending on which class/project it is called from (at least thats what I think delegates are for and how they are used). However, I have some questions on that topic (after some googling): 1) Is it possible to have a delegate that knows the 2 (or more) methods that reside in different classes? 2) Is it possible to make a delegate that spawns off abstract classes (like from the above code)? (My guess is a no, since delegates create concrete implementation of the passed-in classes) 3) I tried to write a delegate for the above code. But I'm being technically challenged: public delegate List GetAllNodesDelegate(int k); GetAllNodesDelegate del = new GetAllNodesDelegate(ClassCurrent.GetAllRootNodes); I got the following error: An object reference is required for the non-static field, method, property ClassCurrent<BaseNode>.GetAllRootNodes(int) I might have misunderstood something... but if I have to manually declare a delegate at the calling class, AND to pass in the function manually as above, then I'm starting to question whether delegate is a good way to handle my problem. Thanks.

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  • Why aren't Admob click callback delegate methods not getting called?

    - by executor21
    I'm integrating the latest version of the admob sdk (version 20100412) into my app. The ads get displayed, but I need the app to make some changes when an ad is clicked and admob displays a full-screen browser. However, none of the callback methods (willPresentFullScreenModal, didPresentFullScreenModal, willDismissFullScreenModal, and didDismissFullScreenModal) are called, even though other delegate methods are. Why aren't these callbacks being made? They were in the previous versions of the SDK, and the sample app doesn't use them, so it's no help.

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  • Flex Flash Action Script Form Events

    - by peiklk
    Doing some development in Flash Builder 4 using Action Script 3.0. I'm trying to have some code run each time the form is displayed. The form is not always recreated, but sometimes hidden and reused. Visual Basic used to have an Activate event that does similar to what I want. I tried Render, but that fires every time the form changes (via click, text-edit, etc.) We tried the FlexEvent.ADD, but it only fires when the form is first created, same as creation_complete. Is there a good resource that shows the form "life cycle" and all the events and when they are fired and in what order? TIA! NOTE: I'm trying to get our forms to close when the ESC is pressed.

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  • jqtransform form events problem

    - by Newbie
    I'm a web designer with css experience, but I'm not a JS developer. I used jqtransform to style a search form , the problem is it removes all events from selectors and the search button . here is the code before jqtransform <input id="go-search" type="button" name="btn_search" value="search" onclick="searchLocations()" /> and after applying the script, the button doesn't do any thing I opened the page source and here how it looks like: <button class=" jqTransformButton" type="button" name="btn_search" id="go-search"><span><span>search</span></span></button> Please help me !

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  • One project in Delphi 2007 doesn't show procedure name in the IDE Obj Inspector's Events

    - by lgallion
    I have a Delphi project in 2007 that doesn't show the procedure names in the Object Inspector's Events such as Form OnClose, OnCreate or OnShow in the IDE. The code is there and if you click on OnCreate (for example) you are taken to the code and the IDE fills in the name of procedure. However on reload, the procedures are missing from the IDE again. This same project causes various error messages when Delphi closes also, but I am not sure if this is related (no other project developed under this Delphi does but this one is the largest app and uses several 3rd party add-in libraries). I have moved this app to various Delphi 2007 installations and it reacts the same, so it isn't a corrupt Delphi situation. Is there any way to rebuild or fix a corrupt project like this? Any help would be appreciated.

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  • MooTools events not firing in IE8

    - by gregory
    I have a Mootools asset created like so: // Create a new asset var asset = new Asset.image(path, { title: this.language.download, events: {click: this.download.bind(this, link)}, }); I have a method of a MooTools object defined as such: download: function(e) { // The path to download console.log('download: ' + e); }, In Firefox the console.log print shows up. In IE8, however, I have no luck. Am I missing something? Any tips or advice would be greatly appreciated. TIA!

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  • How to give highest priority to events generated from main thread than those generated from secondar

    - by martjno
    I have a c++ application written in wxWidgets, which has a main thread (GUI) and a working thread (calculations). The working thread executes commands requested by the main thread and communicates the result to the main thread posting an event after every step of the processing. The problem is that when the working thread is sending many events consecutively, the gui requests made by the user (i.e. interrupt the processing clicking a button) won't be processed by the event handler until the working thread has finished. This is actually happening on OSX, on Windows it works perfectly. I've tried to wxThread::SetPriority and wxThread::Yield but nothing changes. It is working if I put wxThread::Sleep in the working thread, but this slows down very much the processing.

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  • Querying current number of touches on screen without using events on iPhone

    - by nikhil
    I have an application that starts playing a sound when user touches the uiview and changing to different tones as the user slides the finger on the screen. The sound stops when the user lifts the finger. I am using the touchesBegan, Moved and Ended Events for this. My problem is touches Ended (and/or cancelled) is sometimes not fired properly and the sound keeps playing even after the finger is lifted from screen. So as a workaround I would like to implement a timer that would check for the number of touches on the screen and if it is zero it will check and stop the audioplayer if playing. I have been searching for some code that could get me the number of touches like UITouch *touches=[self getAllTouchesonScreen]; or something :)

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  • Capturing USB Plug/Unplug events in Firemonkey

    - by radsdau
    [RAD Studio XE3 / C++] I have a FMX project running in Windows only at this stage, but I need to detect events when USB devices are connected and disconnected. I have a similar VCL app that can do this fine, but the Application-HookMainWindow is not exposed in FMX (only VCL). Is there an elegant way to handle this? Or do I have to hack some VCL stuff into my FMX app to make that work? I'd imagine I have to abstract it so I can support other platforms down the track. For the meantime though I need to get the Windows solution working. If the 'VCL hack' thing is required, how would I reference the vcl::Forms::Application from within my Fmx app? Cheers.

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