在用QT编程时，有时候要实现鼠标右键弹出菜单的功能．下面代码演示鼠标右键弹出菜单．
1.新建一个QT工程，点击MainWindow.ui，鼠标右键Go to slot.....，添加customContextMenuRequested(const QPoint &pos)事件
2.找到属性页中的contextMenuPolicy，把DefaultContextMenu改成CustomContextMenu.保存关闭MainWindow.ui
３.在on_MainWindow_customContextMenuRequested(const QPoint &pos)函数体添加一下代码
void MainWindow::on_MainWindow_customContextMenuRequested(const QPoint &/*pos*/)
{
//创建菜单对象
QMenu *pMenu = new QMenu(this);
QAction *pNewTask = new QAction(tr("新建任务"), this);
QAction *pEditTask = new QAction(tr("设置任务"), this);
QAction *pDeleteTask = new QAction(tr("删除任务"), this);
QAction *pToolRenName = new QAction(tr("改名工具"), this);
QAction *pToolEdot = new QAction(tr("设置工具"), this);
QAction *pToolDelete = new QAction(tr("删除工具"), this);
//1:新建任务 2:设置任务 3:删除任务 4:改名工具 5:设置工具 6:删除工具
pNewTask->setData(1);
pEditTask->setData(2);
pDeleteTask ->setData(3);
pToolRenName->setData(4);
pToolEdot->setData(5);
pToolDelete ->setData(6);
//把QAction对象添加到菜单上
pMenu->addAction(pNewTask);
pMenu->addAction(pEditTask);
pMenu->addAction(pDeleteTask);
pMenu->addAction(pToolRenName);
pMenu->addAction(pToolEdot);
pMenu->addAction(pToolDelete);
//连接鼠标右键点击信号
connect(pNewTask, SIGNAL(triggered()), this, SLOT(onTaskBoxContextMenuEvent()));
connect(pEditTask, SIGNAL(triggered()), this, SLOT(onTaskBoxContextMenuEvent()));
connect(pDeleteTask, SIGNAL(triggered()), SLOT(onTaskBoxContextMenuEvent()));
connect(pToolRenName, SIGNAL(triggered()), this, SLOT(onTaskBoxContextMenuEvent()));
connect(pToolEdot, SIGNAL(triggered()), this, SLOT(onTaskBoxContextMenuEvent()));
connect(pToolDelete, SIGNAL(triggered()), SLOT(onTaskBoxContextMenuEvent()));
//在鼠标右键点击的地方显示菜单
pMenu->exec(cursor().pos());
//释放内存
QList<QAction*> list = pMenu->actions();
foreach (QAction* pAction, list) delete pAction;
delete pMenu;
}
void MainWindow::onTaskBoxContextMenuEvent()
{
QAction *pEven = qobject_cast<QAction *>(this->sender()); //this->sender()就是发信号者 QAction
//获取发送信息类型 1:新建任务 2:设置任务 3:删除任务 4:改名工具 5:设置工具 6:删除工具
int iType = pEven->data().toInt();
switch (iType)
{
case 1:
QMessageBox::about(this, "tip", pEven->text());
break;
case 2:
QMessageBox::about(this, "tip", pEven->text());
break;
case 3:
QMessageBox::about(this, "tip", pEven->text());
break;
case 4:
QMessageBox::about(this, "tip", pEven->text());
break;
case 5:
QMessageBox::about(this, "tip", pEven->text());
break;
case 6:
QMessageBox::about(this, "tip", pEven->text());
break;
default:
break;
}
}
4.运行结果如下所示:
