event-handling

I realise this question has to do with event-handling and i've read about Python event-handler a dispatchers, so either it did not answer my question or i completely missed out the information. I want method m() of object A to be triggered whenever value v is changing: For instance (assuming money makes happy): global_wealth = 0 class Person() def __init__(self): self.wealth = 0 global global_wealth # here is where attribute should be # bound to changes in 'global_wealth' self.happiness = bind_to(global_wealth, how_happy) def how_happy(self, global_wealth): return self.wealth / global_wealth

I need to set up a simple event listener to refresh a ListView once in a while. The problem is I don't know how could I generate an event. I know that for events like key or button pressing I just need to implement the Handler . But in this specific case I actually need to generate the event, which will be fired every time another running thread of my app wakes up and refreshes its list of news from an RSS feed. I've done everything, but got stuck in here. Can I get any suggestion or link with some more info on how to implement this? Define a callback interface public interface

I would like to ensure that I only subscribe once in a particular class for an event on an instance. For example I would like to be able to do the following: if (*not already subscribed*) { member.Event += new MemeberClass.Delegate(handler); } How would I go about implementing such a guard? Hamish Smith If you are talking about an event on a class that you have access to the source for then you could place the guard in the event definition. private bool _eventHasSubscribers = false; private EventHandler<MyDelegateType> _myEvent; public event EventHandler<MyDelegateType> MyEvent { add { if (

I have a class that offers up a few events. That class is declared globally but not instanced upon that global declaration--it's instanced on an as-needed basis in the methods that need it. Each time that class is needed in a method, it is instanced and event handlers are registered. Is it necessary to remove the event handlers explicitly before the method goes out of scope? When the method goes out of scope, so goes the instance of the class. Does leaving event handlers registered with that instance that is going out of scope have a memory footprint implication? (I'm wondering if the event

In my program, I have 9 buttons, and I have 9 separate event handlers for each of them, despite the fact that the code in each event handler is the same. It is proving to be very tedious to change the code for all of them. Is it possible to make a single Button.Click event handler that handles the Button.Click events for all of my buttons? You can modify the Handles clause on the VS generated event code so that it can process the same event for multiple controls. In most cases, someone might want to funnel most, but not all, button clicks to one procedure. To change the Handles clause: Private