一.效果

1.点击下拉列表的复选框区域

2.点击下拉列表的非复选框区域

二.实现

QHCustomComboBox.h

#ifndef QHCUSTOMCOMBOBOX_H
#define QHCUSTOMCOMBOBOX_H#include <QLineEdit>
#include <QListWidget>
#include <QCheckBox>
#include <QComboBox>
#include <QEvent>
#include <QKeyEvent>
#include <QWheelEvent>class QHCustomComboBox: public QComboBox
{Q_OBJECTpublic:explicit QHCustomComboBox(QWidget* parent = nullptr);void addItem(const QString &text, const QVariant &variant = QVariant());void addItems(const QStringList &texts);QStringList currentText();int count() const;void setPlaceHolderText(const QString