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Customizing QComboBox

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  • Ivan NetskinI Offline
    Ivan NetskinI Offline
    Ivan Netskin
    wrote on last edited by
    #3

    if you call QComboBox::showPopup() then the popup list will automatically will be closed if you click outside the combobox. This is why i don't call the CustomCbx::showPopup().

    raven-worxR 1 Reply Last reply
    0
    • Ivan NetskinI Ivan Netskin

      if you call QComboBox::showPopup() then the popup list will automatically will be closed if you click outside the combobox. This is why i don't call the CustomCbx::showPopup().

      raven-worxR Offline
      raven-worxR Offline
      raven-worx
      Moderators
      wrote on last edited by
      #4

      @Ivan-Netskin
      even if i strongly disagree to override such a platform specific behavior, try this:

      void CustomCbx::showPopup()
      {
          this->view()->window()->setFixedSize( width(), maxHeight );
          this->view()->window()->setWindowFlags( Qt::Tool | Qt::FramelessWindowHint | Qt::CustomizeWindowHint ); // this can even be called only once in the constructor i guess
          QComboBox::showPopup();
          expanded=true;
      }
      

      --- SUPPORT REQUESTS VIA CHAT WILL BE IGNORED ---
      If you have a question please use the forum so others can benefit from the solution in the future

      Ivan NetskinI 1 Reply Last reply
      2
      • raven-worxR raven-worx

        @Ivan-Netskin
        even if i strongly disagree to override such a platform specific behavior, try this:

        void CustomCbx::showPopup()
        {
            this->view()->window()->setFixedSize( width(), maxHeight );
            this->view()->window()->setWindowFlags( Qt::Tool | Qt::FramelessWindowHint | Qt::CustomizeWindowHint ); // this can even be called only once in the constructor i guess
            QComboBox::showPopup();
            expanded=true;
        }
        
        Ivan NetskinI Offline
        Ivan NetskinI Offline
        Ivan Netskin
        wrote on last edited by Ivan Netskin
        #5

        @raven-worx
        Thanks, yes this helps, but side effect is that expand/collapse button stops working. i'll go to browse the qt's sources to find out the reason.

        mrjjM 1 Reply Last reply
        0
        • Ivan NetskinI Ivan Netskin

          @raven-worx
          Thanks, yes this helps, but side effect is that expand/collapse button stops working. i'll go to browse the qt's sources to find out the reason.

          mrjjM Offline
          mrjjM Offline
          mrjj
          Lifetime Qt Champion
          wrote on last edited by
          #6

          @Ivan-Netskin
          Hi
          bool QComboBoxPrivateContainer::eventFilter
          is stealing the mouseReleased from you.
          ( i think :)

          Ivan NetskinI 1 Reply Last reply
          0
          • mrjjM mrjj

            @Ivan-Netskin
            Hi
            bool QComboBoxPrivateContainer::eventFilter
            is stealing the mouseReleased from you.
            ( i think :)

            Ivan NetskinI Offline
            Ivan NetskinI Offline
            Ivan Netskin
            wrote on last edited by Ivan Netskin
            #7

            @mrjj
            yep , probably these lines :

            case QEvent::MouseButtonRelease: {
            	        bool ignoreEvent = maybeIgnoreMouseButtonRelease && popupTimer.elapsed() < QApplication::doubleClickInterval();
            	
            	        QMouseEvent *m = static_cast<QMouseEvent *>(e);
                    if (isVisible() && view->rect().contains(m->pos()) && view->currentIndex().isValid()
            	            && !blockMouseReleaseTimer.isActive() && !ignoreEvent
            	            && (view->currentIndex().flags() & Qt::ItemIsEnabled)
            	            && (view->currentIndex().flags() & Qt::ItemIsSelectable)) {
            	            combo->hidePopup();
            	            emit itemSelected(view->currentIndex());
            	            return true;
            	        }
            	        break;
            	    }
            
            1 Reply Last reply
            0
            • mrjjM Offline
              mrjjM Offline
              mrjj
              Lifetime Qt Champion
              wrote on last edited by
              #8

              yep i think so.
              But it seems you can get MouseDown so maybe u can maybe cheat and hax it that way
              and make it close.

              Ivan NetskinI 1 Reply Last reply
              1
              • mrjjM mrjj

                yep i think so.
                But it seems you can get MouseDown so maybe u can maybe cheat and hax it that way
                and make it close.

                Ivan NetskinI Offline
                Ivan NetskinI Offline
                Ivan Netskin
                wrote on last edited by
                #9

                customizing qcombobox is a bit pain. Changing little option may result in
                an unexpected behaviour of the enitre combobox. Is there a way to get expandable list, even if the list inside layout?

                mrjjM 1 Reply Last reply
                0
                • Ivan NetskinI Ivan Netskin

                  customizing qcombobox is a bit pain. Changing little option may result in
                  an unexpected behaviour of the enitre combobox. Is there a way to get expandable list, even if the list inside layout?

                  mrjjM Offline
                  mrjjM Offline
                  mrjj
                  Lifetime Qt Champion
                  wrote on last edited by
                  #10

                  @Ivan-Netskin
                  Well you are fiddling with the core logic. That often leads to side effects.

                  Qt is using private classes to increase compatibility but it also often kills
                  true reuse as only the virtual function the developers could imagine are
                  there to override. But it's worth it :)

                  Also note, you can chain event filters so you might be able that way.

                  However, if you only need combobox then QListWidget and QPushbutton could
                  be use to make fake one. If you need the edit part it becomes more complicated.
                  set Min/max and fixed size are still allowed in layouts.

                  1 Reply Last reply
                  1
                  • Ivan NetskinI Offline
                    Ivan NetskinI Offline
                    Ivan Netskin
                    wrote on last edited by Ivan Netskin
                    #11

                    thanks for reply, the problem is that if i change the widget size,which lies in layout - it will result in growing size of the whole application. This is undesirable behaviour in my case. Also just creating a listview widget without parent and moving it under the QCombobox looks like unclean solution a bit.

                    mrjjM 1 Reply Last reply
                    0
                    • Ivan NetskinI Ivan Netskin

                      thanks for reply, the problem is that if i change the widget size,which lies in layout - it will result in growing size of the whole application. This is undesirable behaviour in my case. Also just creating a listview widget without parent and moving it under the QCombobox looks like unclean solution a bit.

                      mrjjM Offline
                      mrjjM Offline
                      mrjj
                      Lifetime Qt Champion
                      wrote on last edited by
                      #12

                      @Ivan-Netskin
                      ok. it must be floating then :)
                      Before giving up on your custom combobox I would have a look at the eventfilter docs.
                      You might be able to put yourself in front and control it that way.

                      1 Reply Last reply
                      0
                      • Ivan NetskinI Offline
                        Ivan NetskinI Offline
                        Ivan Netskin
                        wrote on last edited by
                        #13

                        found something appropriate - http://libqxt.bitbucket.org/doc/tip/qxtcheckcombobox.html

                        mrjjM 1 Reply Last reply
                        0
                        • Ivan NetskinI Ivan Netskin

                          found something appropriate - http://libqxt.bitbucket.org/doc/tip/qxtcheckcombobox.html

                          mrjjM Offline
                          mrjjM Offline
                          mrjj
                          Lifetime Qt Champion
                          wrote on last edited by
                          #14

                          @Ivan-Netskin
                          But will it stay open ?

                          1 Reply Last reply
                          0
                          • Ivan NetskinI Offline
                            Ivan NetskinI Offline
                            Ivan Netskin
                            wrote on last edited by Ivan Netskin
                            #15

                            From discription it's allowing to select multiple items - that's good enough

                            1 Reply Last reply
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