QT实现右键菜单栏

1.所需头文件

#include <QPoint>    // QPoint 类型
#include <QWidget>   // mapFromGlobal() 的父类
#include <QEvent>    // event->globalPos() 的来源（如 QMouseEvent）
#include <QContextMenuEvent> // 用于 QContextMenuEvent
#include <QMenu>             // 用于 QMenu（如果 m_contextMenu 是 QMenu 类型）

2.重写contextMenuEvent

.h文件中：

protected:void contextMenuEvent(QContextMenuEvent *event) override;

实例函数：

void MainWindow::contextMenuEvent(QContextMenuEvent *event)
{//把鼠标位置转化成相对于QWidget的位置，然后判断是否在tvRecipe内.QPoint i = ui->tvRecipe->mapFromGlobal(event->globalPos());QRect rect(QPoint(0,0),ui->tvRecipe->size());if (rect.contains(i)){m_contextMenu->exec(event->globalPos());}}  其中tvRecipe为在.ui 文件中添加的容器。

3.建立右键菜单

.h文件中定义

 QMenu *m_contextMenu;//菜单名QAction *m_addAction;//添加行为QAction *m_explodeAction;//扩展行为QAction *m_detailAction;//详情行为private slots:void showDetail();void addPatient();void explodeAll();//对应槽函数

初始化菜单栏，建立链接，槽函数初始化

m_contextMenu = new QMenu;m_addAction = new QAction("增加项目",this);m_detailAction=new QAction("项目详情",this);m_explodeAction = new QAction("扩展所有",this);m_contextMenu->addAction(m_addAction);m_contextMenu->addAction(m_explodeAction);m_contextMenu->addAction(m_detailAction);connect(m_addAction, &QAction::triggered, this, &MainWindow::addPatient);connect(m_detailAction, &QAction::triggered, this, &MainWindow::showDetail);connect(m_explodeAction, &QAction::triggered, this, &MainWindow::explodeAll);

槽函数~回调函数


void MainWindow::addPatient()
{QMessageBox::information(this,"","addPatient");
}void MainWindow::showDetail()
{QMessageBox::information(this,"","showdetail");
}void MainWindow::explodeAll()
{QMessageBox::information(this,"","explodeAll");}

4.实验效果