Qt学习之给QPushButton添加菜单DefaultContextMenu方法

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本篇以QPushButton为例实现添加右键菜单，使用DefaultContextMenu方式进行实现。

大体思路和前面两篇添加菜单的方式还是差不多的。虽然是以QPushButton为例进行实现，但是对于所有QWidget添加右键菜单都是适合的。

不同的是菜单策略，DefaultContextMenu需要继承contextMenuEvent事件，

void contextMenuEvent(QContextMenuEvent *event);

设置使用菜单的策略是

setContextMenuPolicy(Qt::DefaultContextMenu);

然后实现contextMenuEvent事件

void DefaultMenu::contextMenuEvent(QContextMenuEvent *event){__super::contextMenuEvent(event);m_menu->exec(QCursor::pos());}

因为QMenu肯定是要显示在光标处，所以可以使用QCursor::pos()来获取光标的当前位置。

实现后的效果如下：

完整代码：

#ifndef DEFAULTMENU_H#define DEFAULTMENU_H#include <QtWidgets/QPushButton>#include <QAction>#include <QMenu>#include <QDebug>class DefaultMenu : public QPushButton{Q_OBJECTpublic:DefaultMenu(QWidget *parent = 0);~DefaultMenu();void contextMenuEvent(QContextMenuEvent *event);protected slots:void actionOneSlot();void actionTwoSlot();void actionThreeSlot();private:QMenu *m_menu;QAction *m_actionOne;QAction *m_actionTwo;QAction *m_actionThree;};#endif // DEFAULTMENU_H

#include "defaultmenu.h"DefaultMenu::DefaultMenu(QWidget *parent): QPushButton(parent){setContextMenuPolicy(Qt::DefaultContextMenu);m_menu = new QMenu(this);m_actionOne = new QAction(this);m_actionTwo = new QAction(this);m_actionThree = new QAction(this);m_actionOne->setText("ActionOne");m_actionTwo->setText("ActionTwo");m_actionThree->setText("ActionThree");m_menu->addAction(m_actionOne);m_menu->addAction(m_actionTwo);m_menu->addAction(m_actionThree);connect(m_actionOne, SIGNAL(triggered()), this, SLOT(actionOneSlot()));connect(m_actionTwo, SIGNAL(triggered()), this, SLOT(actionTwoSlot()));connect(m_actionThree, SIGNAL(triggered()), this, SLOT(actionThreeSlot()));}DefaultMenu::~DefaultMenu(){}void DefaultMenu::actionOneSlot(){qDebug() << "actionOne";}void DefaultMenu::actionTwoSlot(){qDebug() << "actionTwo";}void DefaultMenu::actionThreeSlot(){qDebug() << "actionThree";}void DefaultMenu::contextMenuEvent(QContextMenuEvent *event){__super::contextMenuEvent(event);m_menu->exec(QCursor::pos());}

#include "defaultmenu.h"#include <QtWidgets/QApplication>int main(int argc, char *argv[]){QApplication a(argc, argv);QWidget w;DefaultMenu b(&w);b.setText("Button");w.show();return a.exec();}

源码下载：http://download.csdn.net/detail/u011417605/9466459

本文地址：http://blog.csdn.net/u011417605/article/details/50930698

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