[Qt-interest] About stop processing key events while QLineEdit evaluates

[John Weeks]

You could use global flags to prevent extraneous processing in focus out events; I have some code like that. But I always cringe at such a solution because it makes the code hard to follow.

In my case, I'm handling things like Enter and arrow keys, so I'm pretty much controlling focus myself. I found that after adding sufficient filtering code, I no longer needed to handle focus out events.

Without more detail, we will just have a long-winded discussion :)

Regards, John Weeks


On 27-Oct-2011, at 10:51 PM, Zeljko wrote:

> John Weeks wrote:
> 
>> I have a similar situation of a QLineEdit in a spread-sheet-like window where
>> I need to control what happens with certain key events. I installed an event
>> filter on the QLineEdit, check for key press events, and check the key codes.
>> If they are key codes I want to control, I handle them there and block the
>> event going to the QLineEdit.
> 
> Yes, I already have that, but point is that pressing eg return key in my case 
> selects next lineedit, so this one is loosing focus and then I evaluate it.
> I think that I must make some kind of lock (eg. bool) in application event 
> filter so when evaluated edit starts evaluation it sets lock to true, and when 
> eval is finished it returns lock in normal state. So then in app event filter I 
> need to check such lock and bypass repeated keypresses until lock becomes false 
> ... that's current idea...I'll try to implement it like that and see if that 
> scenario helps.
> 
> zeljko

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