QCheckBox painting problems on macOS

patrickkidd

It appears as though QCheckBox shows Qt::Checked when it is actually Qt::PartiallyChecked for Qt-5.11.0 on macOS. This is the case when QCheckBox::checkState() returns Qt:PartiallyChecked. This is easily reproducible by previewing a tristate QCheckBox in Qt Creator.

There is another possibly related issue where a QCheckBox in a QTableView does not repaint itself when ::setCheckState(Qt::Checked) is called until the table view is redrawn, for example when the cell in question is selected.

Help??

SGaist

Hi,

What version of macOS are you running ?

Can you give a minimal compilable example showing that ?

patrickkidd

Latest Mac OS X and QT 5.11.0. You can reproduce the Partially checked bug in QT creator by just alt-clicking on a checkbox that is tristate. You will never see the partially checked symbol.

I’ll need to make an example for the other bug.

patrickkidd

Just slap these into the vanilla QtWidgets app template to reproduce the bug where it doesn't paint the tristate checkbox on Qt-5.11.0 on macOS. The repaint bug does not appear to occur here with QTableWidget as it does in my QTableView application. I will make an example for that if I have time, but this is enough for now.

#include "widget.h"
#include "ui_widget.h"
#include <QTableWidget>
#include <qDebug>

Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);

    tw = new QTableWidget(this);
    tw->setColumnCount(2);
    tw->setRowCount(2);

    QTableWidgetItem *item = new QTableWidgetItem;
    item->setFlags(Qt::ItemIsUserCheckable | Qt::ItemIsAutoTristate);
    item->setCheckState(Qt::Unchecked);
    tw->setItem(0, 0, item);

    this->startTimer(1000);
}

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


void Widget::timerEvent(QTimerEvent *event) {
    QTableWidgetItem *item = tw->item(0, 0);
    if(item->checkState() == Qt::Checked) {
        item->setCheckState(Qt::PartiallyChecked);
    } else if(item->checkState() == Qt::PartiallyChecked){
        item->setCheckState(Qt::Unchecked);
    } else {
        item->setCheckState(Qt::Checked);
    }
    qDebug() << item->checkState();
}

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>

namespace Ui {
class Widget;
}

class QTableWidget;

class Widget : public QWidget
{
    Q_OBJECT

    QTableWidget *tw;
public:
    explicit Widget(QWidget *parent = 0);
    ~Widget();

    void timerEvent(QTimerEvent *event);

private:
    Ui::Widget *ui;
};

#endif // WIDGET_H

patrickkidd

I posted a bug here:

https://bugreports.qt.io/browse/QTBUG-69346