[wxPython-users] Re: slider.SetValue(x) doesnt send a slider event

[Robin Dunn]

Jim Carroll wrote:
>>> How can I have my slider generate an EVT_SLIDER when I set its value?
>> The general rule in wxWidgets is that events are not sent when values 
>> are changed programatically.  (There are exceptions to this, mainly 
>> those that were already sending an event before the rule was made.)  So 
>> your options are to either send the event yourself, or refactor your 
>> event handler so it calls another method to do its work that you can 
>> also call yourself after doing the SetValue.
>>
> 
> Ok, I'll send the event myself...
> 
> Here's my first guess... it's not quite working:
>  
>             # have the slider emit an event
>             evt = wx.CommandEvent(100, self.minSlider.GetId())

Instead of the 100 use wx.wxEVT_COMMAND_SLIDER_UPDATED.  Otherwise it 
won't match bindings made with EVT_SLIDER.

>             evt.SetEventObject(self.minSlider)
>             evt.SetInt(lum)
>             self.minSlider.ProcessEvent(evt)
>             #wx.PostEvent(self.minSlider, evt)
> 
> I've tried the post, and the process...

Either will send the event.  The former will send it during the 
ProcessEvent call, the latter will send it before the next idle event.


-- 
Robin Dunn
Software Craftsman
http://wxPython.org  Java give you jitters?  Relax with wxPython!