Button clicked not working on Big Sur.

[Flock Andrew]

@mrjj yes but if a user has a program using qt5.15 and runs it on big sur because it might not get updated to qt5.16 in a not that long amount of time they will have this issue and it should be addressed.

[wesblake]

I have the same issue. About half of all buttons in our app do not work but only under Big Sur. I agree Qt needs to get on this. We are close to Apple's release and they are pushing hard on the whole Silicon + universal apps thing. We have Silicon running Big Sur dev kits already and the issue is obviously within Qt.

[mrjj]

Hi
I think they are "on it"
https://bugreports.qt.io/browse/QTBUG-85279
https://bugreports.qt.io/browse/QTBUG-85546

[wesblake]

@mrjj said in Button clicked not working on Big Sur.:

Hi
I think they are "on it"
https://bugreports.qt.io/browse/QTBUG-85279
https://bugreports.qt.io/browse/QTBUG-85546

Thanks, that's great! That's just the ARM part though. 5.15 needs to be fixed for the interim because Qt also said (in their mailing list) that they expected things to work as is (since Apple has the new layer that emulates existing Intel apps). Also, I was mistaken. This is a 5.15 issue, happens on Catalina too, so it's not just Big Sur (the button issue).

[mrjj]

@wesblake
Hi
Same thing - setting background on buttons stops them from emitting clicked() ?

[wesblake]

@mrjj I can try to put together a test app but our app is way too large to figure that out from it. We have a ton of buttons. The app is themed so we use qss for everything (user picks their theme, we apply a qss set). What I can say is that not all buttons no longer send the click (maybe half), buttons that still work also have qss including a background applied, and that this app worked fine through multiple versions of Mac OS + Qt including 5.14.2. As soon as it's built with 5.15, this happens on both Catalina and Big Sur.

[Zygote64]

@mrjj i met the same problem, how can i solve it

PS:
another question: when run qt app from qt creator, showing the second window (such as tooltip, etc) will lead to program hung on Big Sur Beta 1/2/3/4.

[mrjj]

@Zygote64
I dont think there is a fix currently.

[Flock Andrew]

Qt 5.15.0 , has this issue but apps launch
Qt 5.14.2/5.13.2 test app doesn't even display anything I haven't looked into why

Currently my "solution" is to use Qt 5.12.9 since it displays and doesn't seem to have this issue and unlike 5.12.5 doesn't crash on mouse move event but I haven't investigated that behaviour much.

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QDebug>
#include <QKeyEvent>

MainWindow::MainWindow(QWidget *parent)
	: QMainWindow(parent)
	, ui(new Ui::MainWindow)
{
	ui->setupUi(this);
	ui->pushButton->setStyleSheet("border-image: url(:/cc.xlarge.png) 0 0 0 0 stretch stretch;");
	ui->pushButton_2->setStyleSheet("background: rgb(255,0,0);");
	connect(ui->pushButton,&QPushButton::clicked,this,[](){
		qDebug()<<"clacked";
	});
	connect(ui->pushButton_2,&QPushButton::clicked,this,[](){
		qDebug()<<"clacked2";
	});

}

MainWindow::~MainWindow()
{
	delete ui;
}

void MainWindow::keyPressEvent(QKeyEvent *event){
	if(event->key() == Qt::Key_Shift){
		ui->pushButton_2->setStyleSheet("");
	}
}

is my minimal test app main window code all it needs is a ui form with 2 pushbuttons with the given tokens names and a image since I was testing if that was the cause

[Tor Arne]

Please report this as a bug in JIRA, with a minimal test case, so that we can check whether this is a 5.15 regression, a Big Sur issue, or something also present in Catalina.