[Interest] focus handling in qt

pritam.ghanghas at gmail.com pritam.ghanghas at gmail.com
Sat Jul 21 12:00:00 CEST 2012

On Fri, Jul 20, 2012 at 7:57 PM, Konstantin Tokarev <annulen at yandex.ru>wrote:

> 20.07.2012, 17:43, "pritam.ghanghas at gmail.com" <pritam.ghanghas at gmail.com
> >:
> > On Fri, Jul 20, 2012 at 7:00 PM, Konstantin Tokarev <annulen at yandex.ru>
> wrote:
> >> 20.07.2012, 17:23, "pritam.ghanghas at gmail.com" <
> pritam.ghanghas at gmail.com>:
> >>> Hi All,I was looking at qt code to understand "how focus management
> code in qt works in case of  keyboard/remote devices".
> >>> I have some loose ends here. I am hoping someone with more exposure to
> these areas can help me out.
> >>> 1. I couldn't figure out how qt is able to move focus between buttons
> in a widget with left/right. I didn't see any code doing that. There was
> >>> code in qwidget.cpp that handles tab/backtab but no right/left.
> >>> 2. When I enabled directional navigation with QT_KEYPAD_NAVIGATION, it
> screwed up all default focus handling my QTableView.
> >>> Any link to some write up about these areas of qt or guidelines about
> focus handling in pointer less devices will be extremely helpful.
> >>
> >> We write keyPressEvent handlers for our widgets (or event filters) and
> use QWidget::setFocus().
> > we have been doing same but this distributed handling is turning out to
> be error prone. If some robust mechanism is possible, I would like to take
> advantage of that. Even if its partial. Moreover we have had bugs sometimes
> when we lost focus with no one having focus. Mostly easy to fix just by
> looking at new code.
> > But recently I had a issue where i am not able to figure out how I lost
> focus. The target widget gets focus momentarily but then looses focus.
>  There doesn't seem to be any code in our application that may do that. I
> tried intercepting all focus in and focus out events at application level
> to see what is happening. No success as yet. The widget that looses focus
> is a button inside my own custom dialog. I thought lets have a deeper
> understanding of "how qt works in this area before deciding something"
> Connect your slot to QApplication::focusChanged() and set breakpoint in it.

I don't have debugger on the target environment but I will see what I can
do with that signal. Thank you for the suggestion.

> --
> Regards,
> Konstantin

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