Strange: QProgressDialog keeps appearing when clicking on menus on the main window

[Guerrian]

I have a QProgressDialog declared in the MainWindow class. It is setup in the MainWindow constructor as follows:

    dialog = new QProgressDialog(tr("Processing") + "...", tr("Cancel"), 0, 4, this);
    dialog->setWindowModality(Qt::WindowModal);

It is strange but when I click on menu (headings) on the main window, the dialogue appears all by it self without any code calling it or without clicking on any menu item.

[raven-worx]

@Guerrian
then there must be more code which causing this behavior ;)

[mrjj]

Hi
Actually i could reproduce it
with only that 2 lines of code

I simply run program and wait a moment. ( 5-8 secs) then it pops :)
(also in a new clean default GUI project with no menus )

[Guerrian]

I need this to be in the scope of the main window. How do I control this dialogue and prevent it from appearing randomly?

Update
I tried adding "reset", seems to have solved the problem:

dialog = new QProgressDialog(tr("Processing") + "...", tr("Cancel"), 0, 4, this);
dialog->setWindowModality(Qt::WindowModal);
dialog->reset();

[mrjj]

Hi
try without
dialog->setWindowModality(Qt::WindowModal);
and see if that makes a difference.

[Guerrian]

@mrjj
But when I do want it to show, I want the window to be modal!

[mrjj]

@Guerrian
Yeah, u can set same place you call show()
It was just for test. Its a bit odd it pops up.

Never mind. :)
Reading the docs , it clear states why it pops.
its due to setMinimumDuration
http://doc.qt.io/qt-5/qprogressdialog.html#minimumDuration-prop

[Guerrian]

@mrjj
Without this line it still pops up:

dialog->setWindowModality(Qt::WindowModal);

I found that it does not pop up if I use reset at the start:

dialog->setWindowModality(Qt::WindowModal);
dialog->reset();

...use this if the process is cancelled:

dialog->close();

...and do nothing if the process finishes ie. the progress bar reaches maximum, because it auto resets in that case.

[mrjj]

@Guerrian
Yes ?
I posted why :)
the docs have the info.

[Guerrian]

@mrjj
OK, but does it explain about reset? It says about showing "any progress", this seems to apply when there is zero progress. Whereas reset can actually hide the dialogue.

[mrjj]

@Guerrian
Yes it says that
void QProgressDialog::reset()
Resets the progress dialog. The progress dialog becomes hidden if autoClose() is true.