Qt context Menu

Use of context menus (beginner)

The context menu is popup by right-clicking the mouse button. The main description under the basic context menu is how the framework should be written.
As long as the menu-related operations generally use qmenu and qaction can be resolved.

Method 1 is implemented by overriding Contextmenuevent (Qcontextmenuevent *e)

void MainWindow::contextMenuEvent*e){    popmenu->addAction(copyAction);    popmenu->addAction(pasteAction);    popmenu->addAction(deletAction);    popmenu->exec(QCursor::pos());    e->accept();}

The complete code is as follows

. h

#ifndef Mainwindow_h#define mainwindow_h#include <QMainWindow>#include <QContextMenuEvent>Namespace Ui {class MainWindow;} Class MainWindow: Publicqmainwindow{Q_object Public:Explicit MainWindow(Qwidget *parent =0); ~mainwindow ();protected:Private: Ui::mainwindow *ui;    Qmenu *popmenu;    Qaction *copyaction;    Qaction *pasteaction; Qaction *deletaction;voidContextmenuevent (Qcontextmenuevent *);};#endif //Mainwindow_h

. cpp

#include "mainwindow.h"#include "ui_mainwindow.h"Mainwindow::mainwindow (Qwidget *parent): Qmainwindow (parent), UI (NewUi::mainwindow) {Ui->setupui ( This); Popmenu =NewQmenu ( This); Copyaction =NewQaction ("Copy", This); Pasteaction =NewQaction ("Paste", This); Deletaction =NewQaction ("Delete", This); Copyaction->seticon (Qicon (":/icon/copy.png")); Pasteaction->seticon (Qicon (":/icon/parst.png")); Deletaction->seticon (Qicon (":/icon/delet.png"));} Mainwindow::~mainwindow () {Delete UI;}voidMainwindow::contextmenuevent (qcontextmenuevent *e) {popmenu->addaction (copyaction);    Popmenu->addaction (pasteaction); Popmenu->addaction (deletaction);//The position of the popup is the position of the current cursorPopmenu->exec (qcursor::p OS ()); E->accept ();}

Method 2

By adding the action directly in the constructor
Then use Setcontextmenupolicy to set to Actionscontextmenu

 copyaction =  new  Qaction ( "copy" , this); Pasteaction =  new  qaction (  "paste" , this); Deletaction =  new  qaction (  "delete" , this); Copyaction->  SetIcon (Qicon ()); Pasteaction->  SetIcon (Qicon ()); Deletaction->  SetIcon (Qicon ()); Addaction (copyaction); Addaction (pasteaction); Addaction (deletaction); Setcontextmenupolicy (Qt::actionscontextmenu ); 

The effect is as follows:

Qt context Menu