QMenu
最后更新于：2022-04-02 02:10:31
[TOC]
## 概述
实例
```
//创建右键菜单对象
m_menuContext = new QMenu(tr("ContextMenu")); //右键菜单其实不显示ContextMenu文本
//创建“添加条目”菜单项并添加到菜单
QAction *actAdd = new QAction(tr("添加条目"), this);
m_menuContext->addAction( actAdd );
//创建“编辑条目”菜单项并添加到菜单
QAction *actEdit = new QAction(tr("编辑条目"), this);
m_menuContext->addAction( actEdit );
//创建“删除条目”菜单项并添加到菜单
QAction *actDel = new QAction(tr("删除条目"), this);
m_menuContext->addAction( actDel );
//创建“清空所有”菜单项并添加到菜单
QAction *actClearAll = new QAction(tr("清空所有"), this);
m_menuContext->addAction( actClearAll );
connect(ui->listWidget, SIGNAL(customContextMenuRequested(QPoint)),
this, SLOT(onCustomContextMenuRequested(QPoint)) );
//为四个菜单项关联点击信号到槽函数
connect(actAdd, SIGNAL(triggered()), this, SLOT(onAddItemTriggered()));
connect(actEdit, SIGNAL(triggered()), this, SLOT(onEditItemTriggered()));
connect(actDel, SIGNAL(triggered()), this, SLOT(onDelItemTriggered()));
connect(actClearAll, SIGNAL(triggered()), this, SLOT(onClearAllTriggered()));
```
设置右键弹出菜单
```
void Widget::onCustomContextMenuRequested(const QPoint & pos)
{
//控件内的相对坐标转为屏幕坐标
//是列表控件发出的信号，就用列表控件的转换函数
QPoint screenPos = ui->listWidget->mapToGlobal( pos );
//弹出菜单
QAction *actRet = m_menuContext->exec( screenPos );
if(NULL != actRet)//检查非空才能使用该指针
{
qDebug()<text();
}
}
```
弹出右键菜单的槽函数
```
void Widget::onCustomContextMenuRequested(const QPoint & pos)
{
//控件内的相对坐标转为屏幕坐标
//是列表控件发出的信号，就用列表控件的转换函数
QPoint screenPos = ui->listWidget->mapToGlobal( pos );
//弹出菜单
QAction *actRet = m_menuContext->exec( screenPos );
if(NULL != actRet)//检查非空才能使用该指针
{
qDebug()<text();
}
}
```
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