<![CDATA[How to timeouts a lot of objects]]>Hello,
I receive a lot of events from a class. This is the slot called:

@
void caught(int idx);
@

When executed it highlights the row number 'idx' on a QTableView.
I want to clear each highlight after, say, 250 ms.
It would be EXTREMELY easy if I can write:

@
void caught(int idx)
{
model->highlightRow(idx);
QTimer::singleShot(250, model, SLOT(clearHighlightRow(idx)));
}
@

but for some reasons you cannot call a SLOT with parameters :-(

What is the recommended way to achieve the same behavior?

]]>https://forum.qt.io/topic/50247/how-to-timeouts-a-lot-of-objectsRSS for NodeWed, 14 Oct 2026 09:40:17 GMTSat, 17 Jan 2015 21:31:46 GMT60<![CDATA[Reply to How to timeouts a lot of objects on Sun, 18 Jan 2015 13:41:40 GMT]]>Works in all of Qt 5.x as long as you have a compiler that support C++/11 or up.

So, simply write:
@
void caught(int idx)
{
model->highlightRow(idx);
QTimer::singleShot(250, model, idx {model->clearHighlight(idx);});
}
@

One thing to take care off: this will cause a crash if model is destructed while there is still a timer running. You can solve that using a QPointer<MyModel> instead of passing a plain pointer to the closure.

]]>https://forum.qt.io/post/258054https://forum.qt.io/post/258054Sun, 18 Jan 2015 13:41:40 GMT<![CDATA[Reply to How to timeouts a lot of objects on Sun, 18 Jan 2015 10:59:34 GMT]]>Unfortunately I'm still with Qt5.3.

]]>https://forum.qt.io/post/258042https://forum.qt.io/post/258042Sun, 18 Jan 2015 10:59:34 GMT<![CDATA[Reply to How to timeouts a lot of objects on Sat, 17 Jan 2015 22:41:42 GMT]]>If you are using Qt 5.4 and a compiler that supports C++11, you can call QTimer::singleShot() with a lambda function.

]]>https://forum.qt.io/post/258007https://forum.qt.io/post/258007Sat, 17 Jan 2015 22:41:42 GMT<![CDATA[Reply to How to timeouts a lot of objects on Sat, 17 Jan 2015 21:49:06 GMT]]>I found an ugly workaround. In the caught SLOT I enqueue idx and call the singleShot method.
In its own SLOT I dequeue the idx and clear the highlight.

It works, but I don't like it at all.

]]>https://forum.qt.io/post/258000https://forum.qt.io/post/258000Sat, 17 Jan 2015 21:49:06 GMT