event-handling

I've seen the common setup for cross threading access to a GUI control, such as discussed here: Shortest way to write a thread-safe access method to a windows forms control All the web hits I found describe a similar thing. However, why do we need to check InvokeRequired? Can't we just call Invoke directly? I assume the answer is no, so my real question is 'why'? From non-UI threads we can't touch the UI - very bad things can happen, since controls have thread affinity. So from a non-UI thread we must (at a minumum) call Invoke or BeginInvoke . For UI-threads, however - we don't want to call

Is there a way to give a User Control custom events, and invoke the event on a event within the user control. (I'm not sure if invoke is the correct term) public partial class Sample: UserControl { public Sample() { InitializeComponent(); } private void TextBox_Validated(object sender, EventArgs e) { // invoke UserControl event here } } And the MainForm: public partial class MainForm : Form { private Sample sampleUserControl = new Sample(); public MainForm() { this.InitializeComponent(); sampleUserControl.Click += new EventHandler(this.CustomEvent_Handler); } private void CustomEvent_Handler

How do I create a custom event class similar to ActionScript? What I mean by that is a class that I can use to fire off my own events, send the necessary data. I don't wanna use third-party libraries like YUI or jQuery to do it. My goal is to be able to send a event that looks like this. document.addEventListener("customEvent", eventHandler, false); function eventHandler(e){ alert(e.para1); } document.dispatchEvent(new CustomEvent("customEvent", para1, para2)); Please no third-party library solutions. A method that worked for me was to call document.createEvent(), init it and dispatch it with

I want an app's main window to ignore mouse and keyboard events, passing them to applications underneath it in the window manager Z-order. I see how to make child widgets ignore keyboard or mouse events, but how about the main window? I'm trying to make a desktop widget that always sits just over the background and is totally invisible to keyboard and mouse events. (Pass through) Qt::X11BypassWindowManagerHint gets me keyboard pass through (although sadly X11 specific, but fine for now), so how about mouse events? Is there a OS-agnostic way to be transparent to keyboard events? EDIT: The key

I'm using a class that forwards events in C#. I was wondering if there's a way of doing it that requires less code overhead. Here's an example of what I have so far. class A { public event EventType EventA; } class B { A m_A = new A(); public event EventType EventB; public B() { m_A.EventA += OnEventA; } public void OnEventA() { if( EventB ) { EventB(); } } } Class A raises the original event. Class B forwards it as EventB (which is essentially the same event). Class A is hidden from other modules so they can't subscribe to EventA directly. What I'm trying to do is reduce the code overhead in

So maybe I'm just not looking in the right places but I can't find a good explanation of how to do the equivalent of jQuery's $('a').click(function(){ // code here }); in plain old JavaScript? Basically I want to run a function every time an a tag is clicked but I don't have the ability to load jQuery into the page to do it in the way above so I need to know how to do it using plain JavaScript. Kevin Bowersox Working Example: http://jsfiddle.net/6ZNws/ Html <a href="something">CLick Here</a> <a href="something">CLick Here</a> <a href="something">CLick Here</a> Javascript: var anchors =

While this code produces the expected behavior of "1" when touching the screen: document.getElementById('someNodeId').addEventListener('touchmove', touch, true); function touch(evt) { evt.preventDefault(); alert(evt.changedTouches.length); } the same code using a jQuery selector: $('#someNodeId').bind('touchmove', touch); produces the error: "TypeError: Result of expression 'evt.changedTouches'[undefined] is not an object". (Device = iPod Touch OS 3.1.3 (7E18); jQuery 1.4.2). How is this possible and what am I doing wrong? Try $(document).ready (function () { $("#someNodeId").bind("touchmove",