How to timeouts a lot of objects

_Mark_

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?

_Mark_

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.

ckakman

If you are using Qt 5.4 and a compiler that supports C++11, you can call QTimer::singleShot() with a lambda function.

_Mark_

Unfortunately I'm still with Qt5.3.

andre

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.