1.运行截图

widget.ui

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运行界面

2.自定义弹出菜单窗口

此demo演示弹出一个QListWidget，可以修改成各种Widget。

①需要明白Qt的坐标系统。

②需要知道Qt style设置。

③需要用到的类QWidgetAction、QMenu、QListWidget

3.源码

//widget.h
#ifndef WIDGET_H
#define WIDGET_H
#include <QWidget>
#include <QListWidget>
#include <QMenu>
#include <QWidgetAction>
namespace Ui {
class Widget;
}
class Widget : public QWidget
{
    Q_OBJECT
public:
    explicit Widget(QWidget *parent = 0);
    ~Widget();
private:
    Ui::Widget *ui;
private:
    void initDefulatUi();
private Q_SLOTS:
    void slotBtnClicked();
private:
    QListWidget *m_listWidget = nullptr;
    QWidgetAction *m_action = nullptr;
    QMenu *m_menu = nullptr;
};
#endif // WIDGET_H
//widget.cpp
#include "widget.h"
#include "ui_widget.h"
const QString g_strWgtStyle = "#widget\
{\
background-color: rgb(255, 255, 255);\
border: 1px solid #DCDFE6;\
border-radius: 4px;\
}";
const QString g_strLiEditStyle ="#lineEdit\
{\
border:0px;\
font-family: \"微软雅黑\";\
font-size: 20px;\
color: #303133;\
}";
const QString g_strBtnStyle = "#pushButton\
{\
background-color: rgb(255, 255, 255);\
border-image:url(\"D:/1.png\");\
}";
const QString g_strListWidgetStyle = "#listWidget{border:0px}";
Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);
    initDefulatUi();
    m_listWidget = new QListWidget(ui->widget);
    m_listWidget->setObjectName("listWidget");
    m_listWidget->setStyleSheet(g_strListWidgetStyle);
    QStringList nameList;
    nameList<<"张三"<<"李四"<<"王五"<<"赵六";
    m_listWidget->addItems(nameList);
    m_action = new QWidgetAction(nullptr);
    m_action->setDefaultWidget(m_listWidget);
    m_menu = new QMenu(nullptr);
    m_menu->setWindowFlags(m_menu->windowFlags() | Qt::FramelessWindowHint | Qt::NoDropShadowWindowHint);
    m_menu->addAction(m_action);
    connect(ui->pushButton,&QPushButton::clicked,this,&Widget::slotBtnClicked);
}
Widget::~Widget()
{
    delete ui;
}
void Widget::initDefulatUi()
{
    ui->widget->setStyleSheet(g_strWgtStyle);
    ui->lineEdit->setStyleSheet(g_strLiEditStyle);
    ui->pushButton->setStyleSheet(g_strBtnStyle);
    ui->widget->setContentsMargins(5,0,5,0);
}
void Widget::slotBtnClicked()
{
    QPoint pos = ui->widget->pos();
    //获得右下角坐标
    QPoint posRightDown;
    posRightDown.setX(pos.x()+ui->widget->width());
    posRightDown.setY(pos.y()+ui->widget->height());
    m_menu->exec(this->mapToGlobal(posRightDown));
}