QSS, qdateedit, qcalendarwidget custom settings

The style of the date editor only needs to be set qss that will do .

    m_dateedit->setStyleSheet("QDateEdit#MDateEdit{background:#4455ff;color:white;selection-color:yellow;"
                              "font-size:24px;"
                              "border-radius:5px;"
                              "border:2px solid #4455ff;}"
                              "QDateEdit#MDateEdit:hover{border:2px solid black;}"
                              "QDateEdit#MDateEdit:focus{border:2px solid gray;}"
                              "QDateEdit#MDateEdit::drop-down{width:30px;background:#A055ffff;border-radius:2px;}"
                              "QDateEdit#MDateEdit::down-arrow{image:url(/home/yjd/Desktop/ file / menu - suspension .png)}")

The calendar display can also be through qss Set the style , But you can't change the position of the button inside , Text , Icon .

   m_dateedit->setStyleSheet("QDateEdit#MDateEdit{background:#4455ff;color:white;selection-color:yellow;"
                              "font-size:24px;"
                              "border-radius:5px;"
                              "border:2px solid #4455ff;}"
                              "QDateEdit#MDateEdit:hover{border:2px solid black;}"
                              "QDateEdit#MDateEdit:focus{border:2px solid gray;}"
                              "QDateEdit#MDateEdit::drop-down{width:30px;background:#A055ffff;border-radius:2px;}"
                              "QDateEdit#MDateEdit::down-arrow{image:url(/home/yjd/Desktop/ file / menu - suspension .png)}"
                              "QCalendarWidget#MCalendarwidget{border-radius:8px;}"
                              "QCalendarWidget QTableView{alternate-background-color: rgb(128, 128, 128);"
                              "background-color: #AFAFAE;"
                              "color:white;"
                              "selection-background-color:#dddddd;"
                              "selection-color:yellow;"
                              "border-left: 2px solid #AFAFAE;"
                              "border-right: 2px solid #AFAFAE;"
                              "border-bottom: 2px solid #AFAFAE;"
                              "border-bottom-left-radius:8px;border-bottom-right-radius:8px;}");

If you want to change the position of the internal button , At this time, you need to understand QCalendarWidget Source code , There are two main functions ：

QCalendarWidget::QCalendarWidget(QWidget *parent)
    : QWidget(*new QCalendarWidgetPrivate, parent, 0)
{
    
    Q_D(QCalendarWidget);

    setAutoFillBackground(true);
    setBackgroundRole(QPalette::Window);

    QVBoxLayout *layoutV = new QVBoxLayout(this);
    layoutV->setMargin(0);
    d->m_model = new QCalendarModel(this);
    QTextCharFormat fmt;
    fmt.setForeground(QBrush(Qt::red));
    d->m_model->m_dayFormats.insert(Qt::Saturday, fmt);
    d->m_model->m_dayFormats.insert(Qt::Sunday, fmt);
    d->m_view = new QCalendarView(this);
    d->m_view->setObjectName(QLatin1String("qt_calendar_calendarview"));
    d->m_view->setModel(d->m_model);
    d->m_model->setView(d->m_view);
    d->m_view->setSelectionBehavior(QAbstractItemView::SelectItems);
    d->m_view->setSelectionMode(QAbstractItemView::SingleSelection);
    d->m_view->horizontalHeader()->setSectionResizeMode(QHeaderView::Stretch);
    d->m_view->horizontalHeader()->setSectionsClickable(false);
    d->m_view->verticalHeader()->setSectionResizeMode(QHeaderView::Stretch);
    d->m_view->verticalHeader()->setSectionsClickable(false);
    d->m_selection = d->m_view->selectionModel();
    d->createNavigationBar(this);
    d->m_view->setFrameStyle(QFrame::NoFrame);
    d->m_delegate = new QCalendarDelegate(d, this);
    d->m_view->setItemDelegate(d->m_delegate);
    d->update();
    d->updateNavigationBar();
    setFocusPolicy(Qt::StrongFocus);
    setFocusProxy(d->m_view);
    setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Preferred);

    connect(d->m_view, SIGNAL(showDate(QDate)),
            this, SLOT(_q_slotShowDate(QDate)));
    connect(d->m_view, SIGNAL(changeDate(QDate,bool)),
            this, SLOT(_q_slotChangeDate(QDate,bool)));
    connect(d->m_view, SIGNAL(clicked(QDate)),
            this, SIGNAL(clicked(QDate)));
    connect(d->m_view, SIGNAL(editingFinished()),
            this, SLOT(_q_editingFinished()));

    connect(d->prevMonth, SIGNAL(clicked(bool)),
            this, SLOT(_q_prevMonthClicked()));
    connect(d->nextMonth, SIGNAL(clicked(bool)),
            this, SLOT(_q_nextMonthClicked()));
    connect(d->yearButton, SIGNAL(clicked(bool)),
            this, SLOT(_q_yearClicked()));
    connect(d->monthMenu, SIGNAL(triggered(QAction*)),
            this, SLOT(_q_monthChanged(QAction*)));
    connect(d->yearEdit, SIGNAL(editingFinished()),
            this, SLOT(_q_yearEditingFinished()));

    layoutV->setMargin(0);
    layoutV->setSpacing(0);
    layoutV->addWidget(d->navBarBackground);
    layoutV->addWidget(d->m_view);

    d->m_navigator = new QCalendarTextNavigator(this);
    setDateEditEnabled(true);
}
void QCalendarWidgetPrivate::createNavigationBar(QWidget *widget)
{
    
    Q_Q(QCalendarWidget);
    navBarBackground = new QWidget(widget);
    navBarBackground->setObjectName(QLatin1String("qt_calendar_navigationbar"));
    navBarBackground->setAutoFillBackground(true);
    navBarBackground->setBackgroundRole(QPalette::Highlight);

    prevMonth = new QPrevNextCalButton(navBarBackground);
    nextMonth = new QPrevNextCalButton(navBarBackground);
    prevMonth->setAutoRaise(true);
    nextMonth->setAutoRaise(true);
    prevMonth->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Minimum);
    nextMonth->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Minimum);
    nextMonth->setAutoRaise(true);
    updateButtonIcons();
    prevMonth->setAutoRepeat(true);
    nextMonth->setAutoRepeat(true);

    monthButton = new QCalToolButton(navBarBackground);
    monthButton->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Minimum);
    monthButton->setAutoRaise(true);
    monthButton->setPopupMode(QToolButton::InstantPopup);
    monthMenu = new QMenu(monthButton);
    for (int i = 1; i <= 12; i++) {
    
        QString monthName(q->locale().standaloneMonthName(i, QLocale::LongFormat));
        QAction *act = monthMenu->addAction(monthName);
        act->setData(i);
        monthToAction[i] = act;
    }
    monthButton->setMenu(monthMenu);
    yearButton = new QCalToolButton(navBarBackground);
    yearButton->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Minimum);
    yearButton->setAutoRaise(true);
    yearEdit = new QSpinBox(navBarBackground);

    QFont font = q->font();
    font.setBold(true);
    monthButton->setFont(font);
    yearButton->setFont(font);
    yearEdit->setFrame(false);
    yearEdit->setMinimum(m_model->m_minimumDate.year());
    yearEdit->setMaximum(m_model->m_maximumDate.year());
    yearEdit->hide();
    spaceHolder = new QSpacerItem(0,0);

    QHBoxLayout *headerLayout = new QHBoxLayout;
    headerLayout->setMargin(0);
    headerLayout->setSpacing(0);
    headerLayout->addWidget(prevMonth);
    headerLayout->insertStretch(headerLayout->count());
    headerLayout->addWidget(monthButton);
    headerLayout->addItem(spaceHolder);
    headerLayout->addWidget(yearButton);
    headerLayout->insertStretch(headerLayout->count());
    headerLayout->addWidget(nextMonth);
    navBarBackground->setLayout(headerLayout);

    yearEdit->setFocusPolicy(Qt::StrongFocus);
    prevMonth->setFocusPolicy(Qt::NoFocus);
    nextMonth->setFocusPolicy(Qt::NoFocus);
    yearButton->setFocusPolicy(Qt::NoFocus);
    monthButton->setFocusPolicy(Qt::NoFocus);

    //set names for the header controls.
    prevMonth->setObjectName(QLatin1String("qt_calendar_prevmonth"));
    nextMonth->setObjectName(QLatin1String("qt_calendar_nextmonth"));
    monthButton->setObjectName(QLatin1String("qt_calendar_monthbutton"));
    yearButton->setObjectName(QLatin1String("qt_calendar_yearbutton"));
    yearEdit->setObjectName(QLatin1String("qt_calendar_yearedit"));

    updateMonthMenu();
    showMonth(m_model->m_date.year(), m_model->m_date.month());
}

Through this, you can find QCalendarWidget Mode of construction , And you can also find the corresponding button ObjectName, Through this ObjectName You can take out the corresponding button to operate , as follows ：

    QToolButton *prevBtn = m_calendarwidget->findChild<QToolButton*>(QLatin1String("qt_calendar_prevmonth"));
    QToolButton *nextBtn = m_calendarwidget->findChild<QToolButton*>(QLatin1String("qt_calendar_nextmonth"));
    prevBtn->setIcon(QIcon());
    nextBtn->setIcon(QIcon());
    prevBtn->setText(" The previous page ");
    nextBtn->setText(" The next page ");

This is to get the previous page respectively 、 Buttons on the next page , Then configure this button .
Source code download address