If you want to capture the keypress anywhere on the page – $(document).keypress(function(e) { if(e.which == 13) { // enter pressed } }); Don’t worry about the fact this checks for every keypress, it really isn’t putting any significant load on the browser.
Define a callback interface public interface NewsUpdateListener { void onNewsUpdate(<News data to be passed>); } Provide a registration facility on the background thread which gets the RSS feed class <Background processing class name> { …. ArrayList<NewsUpdateListener> listeners = new ArrayList<NewsUpdateListener> (); …. public void setOnNewsUpdateListener (NewsUpdateListener listener) { // Store the listener object this.listeners.add(listener); } … Read more
You should introduce a cast inside the click event handler MouseEventArgs me = (MouseEventArgs) e;
If the object concerned has specified the event keyword, then the only things you can do are add (+=) and remove (-=) handlers, nothing more. I believe that comparing the invocation list length would work, but you need to be operating inside the object to get at it. Also, keep in mind that the += … Read more
You can also create a behavior and attach it to the parent control (in which the scroll events should bubble through). // Used on sub-controls of an expander to bubble the mouse wheel scroll event up public sealed class BubbleScrollEvent : Behavior<UIElement> { protected override void OnAttached() { base.OnAttached(); AssociatedObject.PreviewMouseWheel += AssociatedObject_PreviewMouseWheel; } protected override … Read more
Maybe you are attaching the event twice on the same button. What you could do is unbind any previously set click events like this: $(‘.addToCartButton’).unbind(‘click’).click(function() { alert(“bob”); //addToCart($(this).attr(“id”)); }); This works for all attached events (mouseover, mouseout, click, …)
You need to use named functions. Also, the click variable needs to be outside the handler to increment. var click_count = 0; function myClick(event) { click_count++; if(click_count == 50) { // to remove canvas.removeEventListener(‘click’, myClick); } } // to add canvas.addEventListener(‘click’, myClick); You could close around the click_counter variable like this: var myClick = (function( … Read more
private void Grid_MouseLeftButtonDown(object sender, MouseButtonEventArgs e) { if(Keyboard.IsKeyDown(Key.LeftCtrl) || Keyboard.IsKeyDown(Key.RightCtrl)) { MessageBox.Show(“Control key is down”); } else { MessageBox.Show(“Control key is up”); } }
I found the following solution (tested on Linux, also works on Windows according to @TheSHEEEP): setWindowFlags(windowFlags() | Qt::WindowTransparentForInput); It has been added in more recent qt release (i did not find when) see http://doc.qt.io/qt-5/qt.html
You have to fire the event. In the example on MSDN, they made a protected method OnPropertyChanged to handle this easier (and to avoid duplicate code). // Create the OnPropertyChanged method to raise the event protected void OnPropertyChanged(string name) { PropertyChangedEventHandler handler = PropertyChanged; if (handler != null) { handler(this, new PropertyChangedEventArgs(name)); } } What … Read more