[Qt-interest] Question regarding QTimer

[Vesa Shmuel Peltonen]

Yes, I know :)
The timer is started only once, when mouse is pressed. I expected, that the
timer will timeout after 150 ms even when the mouse is still down, but it is
not.
So, the sequence is this:
1. Mouse press down
-> timer started (I tried even 0 with timeout)
2. Mouse hold down for long time
3. Mouse released
=> timeout slot is called only here (even with 0 timeout).

As I said, tried this only on S^3, maybe platform specific behavior?

Thanks again,
Vesa

On Wed, Mar 16, 2011 at 5:16 PM, Atlant Schmidt
<aschmidt at dekaresearch.com>wrote:

>  Vesa:
>
>
>
>   You know that QTimers are “retriggerable”, right? That is,
>   if you do an m_timer->start(150) multiple times, each
>   within 150 ms of the previous one, the timer doesn’t time-out
>   until 150 ms after the **LAST** call to start().
>
>   Perhaps you’re getting more MouseButtonPress events
>   than you think and they’re re-triggering your timer? Maybe
>   you can place some debugging print or some such in the
>   path that start()s the timer?
>
>
>
>                                       Atlant
>
>
>  ------------------------------
>
> *From:* qt-interest-bounces+aschmidt=dekaresearch.com at qt.nokia.com[mailto:
> qt-interest-bounces+aschmidt=dekaresearch.com at qt.nokia.com] *On Behalf Of
> *Vesa Shmuel Peltonen
> *Sent:* Wednesday, March 16, 2011 10:39
> *To:* qt-interest at qt.nokia.com
> *Subject:* [Qt-interest] Question regarding QTimer
>
>
>
> Hello all,
>
>
>
> I've simple question. I'm trying to start a timer when mouse press event is
> received on eventfilter:
>
>
>
> xxx::eventFilter(QObject *object, QEvent *event)
>
> {
>
>
>
>     if ( event->type() == QEvent::MouseButtonPress )
>
>     {
>
>
>
>            m_timer->start(150); // msec
>
> ...
>
>
>
>
>
>  It seems that the timer timeouts always only after the mouse is released, even if the mouse press is very long (many seconds).
>
> Is this known behavior and is there way to overcome the problem? Is the system process blocking the application thread during the mouse press, so even if the timeout should have happen much earlier, the slot is called only after the mouse is released?
>
> Btw, my environment is Qt 4.7.2 on *S^3 device*. I've not tested the behavior on other platforms.
>
>
>
>  Thanks,
>
> Vesa
>
>
>
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