QMenuBar中item同时显示图标和文字

需求

如图所示，通过设置Icon后只显示图标，不设置Icon只会显示文件，无法让图标和文件同时显示

方法 

通过继承QProxyStyle类，通过函数隐藏子类实现父类QProxyStyle的sizeFromContents、drawControl方法；再通过ui->menubar->setStyle(子类实例化的对象)，可达到Icon和文字同时显示的效果。

代码 

子类实现menuBarIconStyle.h

#ifndef MENUBARICONSTYLE_H
#define MENUBARICONSTYLE_H

#include <QMenuBar>
#include <QMenu>
#include <QAction>
#include <QIcon>
#include <QProxyStyle>
#include <QPainter>
#include <QStyleOptionMenuItem>
#include <QDebug>
#include <QPainterPath>

class menuBarIconStyle : public QProxyStyle
{
public:
    QSize sizeFromContents(ContentsType type, const QStyleOption *option, const QSize &size, const QWidget *widget) const override
    {
        QSize newSize = QProxyStyle::sizeFromContents(type,option,size,widget);
        //设置menbaritem的大小 可以根据实际情况进行更改
        if(type == QStyle::CT_MenuBarItem)
        {
            newSize.setWidth(100);
            newSize.setHeight(40);
        }
        return newSize;
    }
    void drawControl(ControlElement element, const QStyleOption *option,
                     QPainter *painter, const QWidget *widget) const override
    {
        if (element == QStyle::CE_MenuBarItem)
        {
            const QStyleOptionMenuItem *menuItem = qstyleoption_cast<const QStyleOptionMenuItem *>(option);
            if (menuItem && menuItem->menuItemType == QStyleOptionMenuItem::Normal)
            {
                painter->setRenderHint(QPainter::Antialiasing);
                QString text = menuItem->text;
                QRect optionRect = option->rect;
                int x = optionRect.x();
                int y = optionRect.y();
                int width = optionRect.width();
                int height = optionRect.height();
                QColor bgColor("#FFFFFF");
                if(menuItem->state & QStyle::State_Selected)
                {
                    bgColor = QColor("#4F85FD");
                }
                else if (menuItem->state & QStyle::State_MouseOver)
                {
                    bgColor = QColor("#4F85FD");
                }
                painter->setPen(Qt::NoPen); // 无轮廓
                painter->setBrush(bgColor);
                //圆角
                int radius = 5;
                //上边框 10px
                optionRect.adjust(0, 10, 0, 0);
                QPainterPath roundedRectPath;
                roundedRectPath.addRoundedRect(optionRect, radius, radius);
                painter->drawPath(roundedRectPath);
                QColor textColor("#333333");
                if (!text.isEmpty())
                {
                    int margin = 30;
                    int fontSize = 14;
                    // 计算文字区域
                    QRect textRect = optionRect;
                    textRect.setWidth(width);
                    textRect.setX(x + margin);

                    QFont font;
                    font.setPixelSize(fontSize);
                    painter->setFont(font);
                    painter->setPen(textColor);
                    painter->drawText(textRect, Qt::AlignLeft | Qt::AlignVCenter, text);
                }

                int iconSize = 20;
                int iconMargin = 5;
                //居中显示
                QRect checboxRec(optionRect.left()+iconMargin,optionRect.top() +(optionRect.height()-iconSize)/2,iconSize,iconSize);
                const QIcon &icon = menuItem->icon;
                QPixmap pix = icon.pixmap(iconSize, iconSize);
                painter->drawPixmap(checboxRec, pix);
            }
        }
    }
signals:

};

#endif // MENUBARICONSTYLE_H

主窗口代码

mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include "menuBarIconStyle.h"

QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACE

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    MainWindow(QWidget *parent = nullptr);
    ~MainWindow();

private:
    Ui::MainWindow *ui;

    menuBarIconStyle *m_menuBarIconStyle;
};
#endif // MAINWINDOW_H

mainwindow.cpp 

#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    ui->menuFile->setIcon(QIcon(QPixmap(":/image/file.png")));

    m_menuBarIconStyle = new menuBarIconStyle();
    ui->menubar->setStyle(m_menuBarIconStyle);
}

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

完整工程地址

https://download.csdn.net/download/lyj548926543/90038489