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Old December 9th, 2003, 09:42 PM
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Default Trapping all events

Is there anyway to trap all events to have centralized control?

Let me try to make the problem clear. Suppose I have a form and several many controls on it. As we know every control has its own events and according to certain actions(by user, system etc.), corresponding event gets fired. I am trying to centralize the event handling to handle all events of the form and its containing controls in one procedure something like:
Sub EventFired(source As Object, event As ???, args As EventArgs)
    ' source identifies the control say source.Name gives BtnOk, event should give the fired event, say BtnOk.Click o r just Click, args gives the arguments for the event
    .....
    ..... code to identify the source of event, event type and event arguments and can control whether to let the event gets fired or cancel
    .....
    If (condition1) Then
       args.Cancel = True ' cancels the event being fired
    End If
End Sub

Can this be done? If so how? Appreciate for the ideas, comments and solutions.

Thanks

 
Old December 10th, 2003, 12:45 PM
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Default

(Nothing like asking for ideas and comments to open yourself up to soapbox preachers! ;))

<soapbox>
This idea seems to just completely waste the point of event driven programming. Is it so hard to test for the given condition in each handler? What about disabling controls based on conditions? Example: When a condition is reached and a certain button should not be "clickable" because of that condition, just disable the button.

If you actually wanted to try to do this, then you'll have a lot of work to do. You could derive your own set of controls from the standard controls and handle the controls events in your own specialized way (i.e. raise a common event).

Frankly, the whole idea you pose seems odd and defeats the purpose of the event driven programming paradigm.
</soapbox>

Peter
------------------------------------------------------
Work smarter, not harder.





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