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How can I show context menu (right-click) only for a specific View?

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  • L Loquat
    31 Aug 2021, 21:45

    @eyllanesc only once for now

    E Offline
    E Offline
    eyllanesc
    wrote on 31 Aug 2021, 21:49 last edited by eyllanesc
    #8

    @Loquat

    1. Could you give more detail about your sentence: The menu shows wherever I click in the window? The QListView occupies the entire QDockWidget even that empty space under the items is part of the QListView.

    2. With your implementation you should only call it once since if you do it several times then myView will refer only to the last QListView.

    3. The position of the contextMenuEvent is with respect to the viewport of the QListView so you must change to: QPoint globalPos = deviceView->viewport()->mapToGlobal(pos);

    4. Also use the new-syntax connection: connect(myView, &QWidget::customContextMenuRequested, this, &MyMainWindowClass::showContextMenu);

    If you want me to help you develop some work then you can write to my email: e.yllanescucho@gmal.com.

    L 1 Reply Last reply 31 Aug 2021, 23:11
    0
    • E eyllanesc
      31 Aug 2021, 21:49

      @Loquat

      1. Could you give more detail about your sentence: The menu shows wherever I click in the window? The QListView occupies the entire QDockWidget even that empty space under the items is part of the QListView.

      2. With your implementation you should only call it once since if you do it several times then myView will refer only to the last QListView.

      3. The position of the contextMenuEvent is with respect to the viewport of the QListView so you must change to: QPoint globalPos = deviceView->viewport()->mapToGlobal(pos);

      4. Also use the new-syntax connection: connect(myView, &QWidget::customContextMenuRequested, this, &MyMainWindowClass::showContextMenu);

      L Offline
      L Offline
      Loquat
      wrote on 31 Aug 2021, 23:11 last edited by
      #9

      @eyllanesc To answer 1, the menu shows wherever I mean it shows even when right-clicking outside the QListView

      E 1 Reply Last reply 31 Aug 2021, 23:12
      0
      • L Loquat
        31 Aug 2021, 23:11

        @eyllanesc To answer 1, the menu shows wherever I mean it shows even when right-clicking outside the QListView

        E Offline
        E Offline
        eyllanesc
        wrote on 31 Aug 2021, 23:12 last edited by
        #10

        @Loquat Could you provide a complete example, with that piece of code I can't reproduce the problem.

        If you want me to help you develop some work then you can write to my email: e.yllanescucho@gmal.com.

        1 Reply Last reply
        3
        • L Offline
          L Offline
          Loquat
          wrote on 1 Sept 2021, 08:55 last edited by Loquat 9 Jan 2021, 10:25
          #11

          I tried to replicate with QListWidget to simplify things and the context menu still shows up when you right-click anywhere in the main window instead of showing up only for the List Widget. There's not much to it but here is an example that is hopefully reproducible for you (QListWidget* myList is a private member of MyClass)

          Example:

          /*Constructor*/
          MyClass::MyClass(QWidget *parent, Qt::WindowFlags flags) :
              QMainWindow(parent, flags)
          {
              QDockWidget* dock = new QDockWidget(tr("My View Dock"), this);
          
              myList= new QListWidget(dock);
              myList->setContextMenuPolicy(Qt::CustomContextMenu);
              connect(myList, SIGNAL(customContextMenuRequested(QPoint)), this, SLOT(showContextMenu(QPoint)));       
              dock->setWidget(myList);
              dock->setAllowedAreas(Qt::AllDockWidgetAreas);
              addDockWidget(Qt::LeftDockWidgetArea, dock);
          }
          
          
          void MyClass::showContextMenu(const QPoint& pos)
          {
              /* Handle global position */
              QPoint globalPos = myList->viewport()->mapToGlobal(pos);
          
              /* Create menu and insert some actions */
              QMenu rightClickMenu(myList);
              QAction* Action1 = rightClickMenu.addAction("Action1");
              QAction* Action2= rightClickMenu.addAction("Action2");
          
              selectedMenuItem = rightClickMenu.exec(globalPos);
              if (!selectedMenuItem)
              {
                  return;
              }
          
              if (selectedMenuItem == Action1)
              {
                  //do something
              }
              if (selectedMenuItem == Action2)
              {
                  //do something else
              }
          }
          
          1 Reply Last reply
          0
          • S Offline
            S Offline
            SGaist
            Lifetime Qt Champion
            wrote on 1 Sept 2021, 09:18 last edited by
            #12

            That's why @eyllanesc asked you for a complete minimal compilable example.

            With the small pieces you give here we can't do that as we have to guess the rest of the structure.

            Interested in AI ? www.idiap.ch
            Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

            L 1 Reply Last reply 1 Sept 2021, 11:07
            1
            • S SGaist
              1 Sept 2021, 09:18

              That's why @eyllanesc asked you for a complete minimal compilable example.

              With the small pieces you give here we can't do that as we have to guess the rest of the structure.

              L Offline
              L Offline
              Loquat
              wrote on 1 Sept 2021, 11:07 last edited by Loquat 9 Jan 2021, 11:21
              #13

              @eyllanesc and @SGaist Okay, so below is a reproducible example for you. Please, run it and right-click on the list inside the QListWidget - no context pops up. But when you click anywhere else, even the toolbar, the context menu shows up... what am I doing wrong? I'd like the context menu to show only for the given item in the QList (be it QListView or as it's here QListWidget for simplification purposes). I have to use Qt4 in my original code, hence my usage of lambda here is maybe wrong, as I tried to squeeze everything in main().

              #include <QApplication>
              #include <QDebug>
              #include <QDockWidget>
              #include <QMenuBar>
              #include <QToolBar>
              #include <QMenu>
              #include <QAction>
              
              
              int main(int argc, char* argv[])
              {
                  QApplication app(argc, argv);
                  QMainWindow myMainWindow;
              
                  QMenuBar* menuBar = new QMenuBar();
                  QToolBar* toolBar = new QToolBar();
                  toolBar->setObjectName("ToolBar");
                  QMenu* fileMenu = new QMenu("&File", menuBar);
                  menuBar->addMenu(fileMenu);
                  myMainWindow.setMenuBar(menuBar);
                  myMainWindow.addToolBar(Qt::TopToolBarArea, toolBar);
              
                  QDockWidget* dock = new QDockWidget("My View Dock");
              
                  QListWidget* myList = new QListWidget(dock);
                  myList->addItem("Item 1");
                  myList->addItem("Item 2");
                  myList->setContextMenuPolicy(Qt::CustomContextMenu);
                  QObject::connect(myList, &QListWidget::customContextMenuRequested, [myList](const QPoint& pos) {
                  qDebug() << myList->indexAt(pos);
              
                  QPoint globalPos = myList->viewport()->mapToGlobal(pos);
                  /* Create menu and insert some actions */
                  QMenu rightClickMenu(myList);
                  rightClickMenu.addAction("context1");
                  rightClickMenu.addAction("context2");
              
                  });
                  dock->setWidget(myList);
                  dock->setAllowedAreas(Qt::AllDockWidgetAreas);
              
                  myMainWindow.addDockWidget(Qt::LeftDockWidgetArea, dock);
              
                  myMainWindow.show();
                  return app.exec();
              }
              
              1 Reply Last reply
              0
              • C Offline
                C Offline
                Cobra91151
                wrote on 1 Sept 2021, 11:23 last edited by Cobra91151 9 Jan 2021, 11:26
                #14

                @Loquat

                Hello!

                You must call rightClickMenu.exec(myList->viewport()->mapToGlobal(pos)); at end of your lambda to display your context menu. I have improved your example code, feel free to try out.

                Code:

                #include <QApplication>
                #include <QStandardItemModel>
                #include <QListView>
                #include <QDebug>
                #include <QDockWidget>
                #include <QMenuBar>
                #include <QToolBar>
                #include <QMenu>
                #include <QAction>
                #include <QMainWindow>
                #include <QListWidget>
                
                int main(int argc, char* argv[])
                {
                    QApplication app(argc, argv);
                    QMainWindow myMainWindow;
                
                    QMenuBar* menuBar = new QMenuBar();
                    QToolBar* toolBar = new QToolBar();
                    toolBar->setObjectName("ToolBar");
                    QMenu* fileMenu = new QMenu("&File", menuBar);
                    menuBar->addMenu(fileMenu);
                    myMainWindow.setMenuBar(menuBar);
                    myMainWindow.addToolBar(Qt::TopToolBarArea, toolBar);
                
                    QDockWidget *dock = new QDockWidget("My View Dock");
                
                    QListWidget *myList = new QListWidget(dock);
                    myList->addItem("Item 1");
                    myList->addItem("Item 2");
                    myList->setContextMenuPolicy(Qt::CustomContextMenu);
                    QObject::connect(myList, &QListWidget::customContextMenuRequested, [myList](const QPoint& pos) {
                        qDebug() << myList->indexAt(pos);
                        /* Create menu and insert some actions */
                        QMenu rightClickMenu(myList);
                        rightClickMenu.addAction("context1");
                        rightClickMenu.addAction("context2");
                        rightClickMenu.exec(myList->viewport()->mapToGlobal(pos)); // displays the context menu
                    });
                    dock->setWidget(myList);
                    dock->setAllowedAreas(Qt::AllDockWidgetAreas);
                
                    myMainWindow.addDockWidget(Qt::LeftDockWidgetArea, dock);
                
                    myMainWindow.show();
                    return app.exec();
                }
                

                Screenshot:
                List_context_menu_example.gif

                Happy coding!

                L 1 Reply Last reply 1 Sept 2021, 11:27
                0
                • C Cobra91151
                  1 Sept 2021, 11:23

                  @Loquat

                  Hello!

                  You must call rightClickMenu.exec(myList->viewport()->mapToGlobal(pos)); at end of your lambda to display your context menu. I have improved your example code, feel free to try out.

                  Code:

                  #include <QApplication>
                  #include <QStandardItemModel>
                  #include <QListView>
                  #include <QDebug>
                  #include <QDockWidget>
                  #include <QMenuBar>
                  #include <QToolBar>
                  #include <QMenu>
                  #include <QAction>
                  #include <QMainWindow>
                  #include <QListWidget>
                  
                  int main(int argc, char* argv[])
                  {
                      QApplication app(argc, argv);
                      QMainWindow myMainWindow;
                  
                      QMenuBar* menuBar = new QMenuBar();
                      QToolBar* toolBar = new QToolBar();
                      toolBar->setObjectName("ToolBar");
                      QMenu* fileMenu = new QMenu("&File", menuBar);
                      menuBar->addMenu(fileMenu);
                      myMainWindow.setMenuBar(menuBar);
                      myMainWindow.addToolBar(Qt::TopToolBarArea, toolBar);
                  
                      QDockWidget *dock = new QDockWidget("My View Dock");
                  
                      QListWidget *myList = new QListWidget(dock);
                      myList->addItem("Item 1");
                      myList->addItem("Item 2");
                      myList->setContextMenuPolicy(Qt::CustomContextMenu);
                      QObject::connect(myList, &QListWidget::customContextMenuRequested, [myList](const QPoint& pos) {
                          qDebug() << myList->indexAt(pos);
                          /* Create menu and insert some actions */
                          QMenu rightClickMenu(myList);
                          rightClickMenu.addAction("context1");
                          rightClickMenu.addAction("context2");
                          rightClickMenu.exec(myList->viewport()->mapToGlobal(pos)); // displays the context menu
                      });
                      dock->setWidget(myList);
                      dock->setAllowedAreas(Qt::AllDockWidgetAreas);
                  
                      myMainWindow.addDockWidget(Qt::LeftDockWidgetArea, dock);
                  
                      myMainWindow.show();
                      return app.exec();
                  }
                  

                  Screenshot:
                  List_context_menu_example.gif

                  Happy coding!

                  L Offline
                  L Offline
                  Loquat
                  wrote on 1 Sept 2021, 11:27 last edited by Loquat 9 Jan 2021, 11:29
                  #15

                  @Cobra91151 Fantastic, thanks, that's helped! The context menu does still appear for the ToolBar and MenuBar, though - how can I prevent that? Plus, I don't want the context menu at a blank row in the list - I want it to show up only when I right-click a specific row - is that possible?

                  C 1 Reply Last reply 1 Sept 2021, 11:48
                  0
                  • C Offline
                    C Offline
                    Cobra91151
                    wrote on 1 Sept 2021, 11:33 last edited by
                    #16

                    @Loquat

                    Yes, it is possible. I will do it, wait a bit.

                    1 Reply Last reply
                    1
                    • L Loquat
                      1 Sept 2021, 11:27

                      @Cobra91151 Fantastic, thanks, that's helped! The context menu does still appear for the ToolBar and MenuBar, though - how can I prevent that? Plus, I don't want the context menu at a blank row in the list - I want it to show up only when I right-click a specific row - is that possible?

                      C Offline
                      C Offline
                      Cobra91151
                      wrote on 1 Sept 2021, 11:48 last edited by Cobra91151 9 Jan 2021, 11:50
                      #17

                      @Loquat

                      So, I disabled the context menu by adding: setContextMenuPolicy(Qt::PreventContextMenu); to menuBar, toolBar and dock objects. Now, the context menu works only for your list. Check out my code below.

                      Code:

                      #include <QApplication>
                      #include <QStandardItemModel>
                      #include <QListView>
                      #include <QDebug>
                      #include <QDockWidget>
                      #include <QMenuBar>
                      #include <QToolBar>
                      #include <QMenu>
                      #include <QAction>
                      #include <QMainWindow>
                      #include <QListWidget>
                      
                      int main(int argc, char* argv[])
                      {
                          QApplication app(argc, argv);
                          QMainWindow myMainWindow;
                      
                          QMenuBar *menuBar = new QMenuBar();
                          menuBar->setContextMenuPolicy(Qt::PreventContextMenu);
                          QToolBar *toolBar = new QToolBar();
                          toolBar->setObjectName("ToolBar");
                          QMenu *fileMenu = new QMenu("&File", menuBar);
                          menuBar->addMenu(fileMenu);
                          myMainWindow.setMenuBar(menuBar);
                          myMainWindow.addToolBar(Qt::TopToolBarArea, toolBar);
                          toolBar->setContextMenuPolicy(Qt::PreventContextMenu);
                      
                          QDockWidget *dock = new QDockWidget("My View Dock");
                          dock->setContextMenuPolicy(Qt::PreventContextMenu);
                      
                          QListWidget *myList = new QListWidget(dock);
                          myList->addItem("Item 1");
                          myList->addItem("Item 2");
                          myList->setContextMenuPolicy(Qt::CustomContextMenu);
                          QObject::connect(myList, &QListWidget::customContextMenuRequested, [myList](const QPoint& pos) {
                              QModelIndex index = myList->indexAt(pos);
                      
                              if (index.isValid()) {
                                  /* Create menu and insert some actions */
                                  QMenu rightClickMenu(myList);
                                  rightClickMenu.addAction("context1");
                                  rightClickMenu.addAction("context2");
                                  rightClickMenu.exec(myList->viewport()->mapToGlobal(pos));
                              }
                      
                              /* Second example, you can use the itemAt method
                              if (myList->itemAt(pos) != nullptr) {
                                  //Create menu and insert some actions
                                  QMenu rightClickMenu(myList);
                                  rightClickMenu.addAction("context1");
                                  rightClickMenu.addAction("context2");
                                  rightClickMenu.exec(myList->viewport()->mapToGlobal(pos));
                              }
                              */
                          });
                          dock->setWidget(myList);
                          dock->setAllowedAreas(Qt::AllDockWidgetAreas);
                      
                          myMainWindow.addDockWidget(Qt::LeftDockWidgetArea, dock);
                      
                          myMainWindow.show();
                          return app.exec();
                      }
                      

                      Screenshot:
                      List_context_menu_example2.gif

                      There are two ways how you can display the context menu for your list items.

                      1. You can check if the QModelIndex is valid. You can get the index from your list: myList->indexAt(pos)
                      2. You can get the actual item by using myList->itemAt(pos) method and check for nullptr.
                      L 1 Reply Last reply 1 Sept 2021, 12:55
                      1
                      • C Cobra91151
                        1 Sept 2021, 11:48

                        @Loquat

                        So, I disabled the context menu by adding: setContextMenuPolicy(Qt::PreventContextMenu); to menuBar, toolBar and dock objects. Now, the context menu works only for your list. Check out my code below.

                        Code:

                        #include <QApplication>
                        #include <QStandardItemModel>
                        #include <QListView>
                        #include <QDebug>
                        #include <QDockWidget>
                        #include <QMenuBar>
                        #include <QToolBar>
                        #include <QMenu>
                        #include <QAction>
                        #include <QMainWindow>
                        #include <QListWidget>
                        
                        int main(int argc, char* argv[])
                        {
                            QApplication app(argc, argv);
                            QMainWindow myMainWindow;
                        
                            QMenuBar *menuBar = new QMenuBar();
                            menuBar->setContextMenuPolicy(Qt::PreventContextMenu);
                            QToolBar *toolBar = new QToolBar();
                            toolBar->setObjectName("ToolBar");
                            QMenu *fileMenu = new QMenu("&File", menuBar);
                            menuBar->addMenu(fileMenu);
                            myMainWindow.setMenuBar(menuBar);
                            myMainWindow.addToolBar(Qt::TopToolBarArea, toolBar);
                            toolBar->setContextMenuPolicy(Qt::PreventContextMenu);
                        
                            QDockWidget *dock = new QDockWidget("My View Dock");
                            dock->setContextMenuPolicy(Qt::PreventContextMenu);
                        
                            QListWidget *myList = new QListWidget(dock);
                            myList->addItem("Item 1");
                            myList->addItem("Item 2");
                            myList->setContextMenuPolicy(Qt::CustomContextMenu);
                            QObject::connect(myList, &QListWidget::customContextMenuRequested, [myList](const QPoint& pos) {
                                QModelIndex index = myList->indexAt(pos);
                        
                                if (index.isValid()) {
                                    /* Create menu and insert some actions */
                                    QMenu rightClickMenu(myList);
                                    rightClickMenu.addAction("context1");
                                    rightClickMenu.addAction("context2");
                                    rightClickMenu.exec(myList->viewport()->mapToGlobal(pos));
                                }
                        
                                /* Second example, you can use the itemAt method
                                if (myList->itemAt(pos) != nullptr) {
                                    //Create menu and insert some actions
                                    QMenu rightClickMenu(myList);
                                    rightClickMenu.addAction("context1");
                                    rightClickMenu.addAction("context2");
                                    rightClickMenu.exec(myList->viewport()->mapToGlobal(pos));
                                }
                                */
                            });
                            dock->setWidget(myList);
                            dock->setAllowedAreas(Qt::AllDockWidgetAreas);
                        
                            myMainWindow.addDockWidget(Qt::LeftDockWidgetArea, dock);
                        
                            myMainWindow.show();
                            return app.exec();
                        }
                        

                        Screenshot:
                        List_context_menu_example2.gif

                        There are two ways how you can display the context menu for your list items.

                        1. You can check if the QModelIndex is valid. You can get the index from your list: myList->indexAt(pos)
                        2. You can get the actual item by using myList->itemAt(pos) method and check for nullptr.
                        L Offline
                        L Offline
                        Loquat
                        wrote on 1 Sept 2021, 12:55 last edited by
                        #18

                        @Cobra91151 That's brilliant! Thanks very much!

                        1 Reply Last reply
                        0

                        16/18

                        1 Sept 2021, 11:33

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