How to temporarily disable an event handler

[Andreas Falkenhahn]

I'm listening to wxEVT_LIST_ITEM_SELECTED for my wxListCtrl. That event also triggers when my app calls the Select() method to select an item. What is the typical way to prevent Select() from firing the event? Should I simply unbind and then bind again or how is this typically done? E.g. should I do something like this: (pseudo-code)

lv->Unbind(wxEVT_LIST_ITEM_SELECTED);
lv->Select(item);
lv->Bind(wxEVT_LIST_ITEM_SELECTED);

What's the recommended way to temporarily disable event handlers like wxEVT_LIST_ITEM_SELECTED?

--
Best regards,
Andreas Falkenhahn mailto:and...@falkenhahn.com

[Igor Korot]

Hi,

On Tue, Aug 29, 2023 at 2:51 PM Andreas Falkenhahn
<and...@falkenhahn.com> wrote:
>
> I'm listening to wxEVT_LIST_ITEM_SELECTED for my wxListCtrl. That event also triggers when my app calls the Select() method to select an item. What is the typical way to prevent Select() from firing the event? Should I simply unbind and then bind again or how is this typically done? E.g. should I do something like this: (pseudo-code)
>
> lv->Unbind(wxEVT_LIST_ITEM_SELECTED);
> lv->Select(item);
> lv->Bind(wxEVT_LIST_ITEM_SELECTED);

This should work just fine.
Do you have any issues with that?

Thank you.

>
> What's the recommended way to temporarily disable event handlers like wxEVT_LIST_ITEM_SELECTED?
>
> --
> Best regards,
> Andreas Falkenhahn mailto:and...@falkenhahn.com
>

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[Andreas Falkenhahn]

On 29.08.2023 at 21:59 Igor Korot wrote:

>> lv->Unbind(wxEVT_LIST_ITEM_SELECTED);
>> lv->Select(item);
>> lv->Bind(wxEVT_LIST_ITEM_SELECTED);

> This should work just fine.
> Do you have any issues with that?

No, I was just wondering whether this was the canonical way to do it or
if there was a better way because binding and unbinding sounds like this
could come with some overhead but maybe this isn't true.

[PB]

Hi,

I have never used it so may be I am misunderstanding its purpose, but there is wxEventBlocker; so perhaps you could do something like (untested):

{

   wxEventBlocker blocker(lv, wxEVT_LIST_ITEM_SELECTED);

   lv->Select(item);

}

IMO, a bit cleaner than Bind/Unbind but as I said, I have no idea if it works.

PB

[PB]

EDIT: Perhaps the window used in the blocker ctor should be the one where the event is handled, not the one generating the event...

[Simon Richter]

Hi,

On 8/30/23 04:52, Andreas Falkenhahn wrote:

> I'm listening to wxEVT_LIST_ITEM_SELECTED for my wxListCtrl. That event also triggers when my app calls the Select() method to select an item. What is the typical way to prevent Select() from firing the event?

That is a fairly uncommon requirement, so I'm suspecting a bit of an X-Y
problem here. What is the actual use case?

Simon