WPF gives us a number of different mechanisms for handling events – they are bubbling, tunneling, and direct. These are all known as Routed events. Direct event You are probably already used to the direct routed event. This is where the item itself handles the event that occurred. A good example would be handling he … Read more
I solved it by calling .getPath() and putting the listener inside the listener which is called every time a shape is clicked. I think the Google API documentation is not very clear on how to use the set_at so it may be useful for other people too. // Add an event listener that selects the … Read more
The xterm terminal emulator defines some control sequences to do mouse tracking, you can learn more about them in the section Mouse Tracking in the document ctlseqs for the xterm distribution. If you have xterm installed, you’ll probably have a copy at /usr/share/doc/xterm/ctlseqs.txt.gz or a similar path. Most terminal emulators running on the X Window … Read more
Avoid using MessageBox.Show() to debug this. It pumps a message loop, disturbing the normal flow of events. The Load event is triggered by Windows sending the WM_SHOWWINDOW message, just before the window becomes visible. There is no Windows notification for “your window is now fully shown”, so the WF designers came up with a trick … Read more
Here is a simple working example. Whatever you return from the unload callback will be displayed in a browser popup confirmation. Working example sending Ajax request before unload http://jsfiddle.net/alexflav23/hujQs/7/ The easiest way to do this: window.onbeforeunload = function(event) { // do stuff here return “you have unsaved changes. Are you sure you want to navigate … Read more
The key concept in .NET code is to define event(s) as method(s) on a separate interface and connect it to the class via [ComSourceInterfacesAttribute]. In the example this is done with this code [ComSourceInterfaces(typeof(IEvents))] where IEvents interface defines the event(s) which should be handled on COM client. Note to event naming: Event names defined in … Read more
Using Oracle you can setup a Trigger on a table and then have the trigger send a JMS message. Oracle has two different JMS implementations. You can then have a process that will ‘listen’ for the message using the JDBC Driver. I have used this method to push changes out to my application vs. polling. … Read more
You can use the NetworkChange class, with the NetworkAvailabilityChanged event: NetworkChange.NetworkAvailabilityChanged += myNetworkAvailabilityChangeHandler; Since it’s a system event, make sure you delete the event when you’re finished, see this post here: You need to be careful about using event handler for NetworkChange
Often, event queues are implemented as command design pattern: In object-oriented programming, the command pattern is a design pattern in which an object is used to represent and encapsulate all the information needed to call a method at a later time. This information includes the method name, the object that owns the method and values … Read more
React supports Synthetic Events across it’s Virtual DOM in both capturing and bubbling phases (as described here: https://facebook.github.io/react/docs/events.html). This means that you could put an onClick handler on any DOM element near the root and it should trigger for all Click events on the page: <root> <div onClick={this.handleAllClickEvents}> <comp1> <comp2> <target> <div id={this.props.id}>click me</div> However, … Read more