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Change mouse icon on Macwhen performing a Drag Drop

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  • ValentinMicheletV Offline
    ValentinMicheletV Offline
    ValentinMichelet
    wrote on last edited by
    #2

    Hi,

    Maybe you can use

    QApplication::setOverrideCursor(Qt::DragCopyCursor);
    

    If you do so, when drag/drop event is done, DON'T USE IT WITH Qt::ArrowCursor. Instead, use the restore method:

    QApplication::restoreOverrideCursor();
    
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    • J Offline
      J Offline
      jpalbertini
      wrote on last edited by
      #3

      Thanks for your reply :)

      Just tried that, doesn't work... Seems there is a thing with D&D icon management...

      BTW i use Qt 5.4.1 if it helps, i searched bug known bugs but nothing of this sort

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      • SGaistS Offline
        SGaistS Offline
        SGaist
        Lifetime Qt Champion
        wrote on last edited by
        #4

        Hi,

        Are you creating the QDrag object yourself ?

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

        J 1 Reply Last reply
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        • SGaistS SGaist

          Hi,

          Are you creating the QDrag object yourself ?

          J Offline
          J Offline
          jpalbertini
          wrote on last edited by
          #5

          @SGaist :
          Yes I do. I did not tried setting a pixmap to it though, i would prefer, if possible, the system icon instead of a custom one...

          ValentinMicheletV 1 Reply Last reply
          0
          • J jpalbertini

            @SGaist :
            Yes I do. I did not tried setting a pixmap to it though, i would prefer, if possible, the system icon instead of a custom one...

            ValentinMicheletV Offline
            ValentinMicheletV Offline
            ValentinMichelet
            wrote on last edited by
            #6

            @jpalbertini
            Could you show us your code please? Or better, provide a minimal code to reproduce this behavior.

            J 1 Reply Last reply
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            • J jpalbertini

              Hi
              I try to reproduce the behavior of the OSX finder: by default it moves files/directories but press ALT while doing it and it will duplicate, showing a white "+" near the mouse cursor...
              My problem is, i can't reproduce this... I always got the plus sign.
              I tried using the "setCursor" method with something like that in the dragMoveEvent:

              if (event->keyboardModifiers() == modifier)
              		setCursor(Qt::DragCopyCursor);
              	else
              		setCursor(Qt::DragMoveCursor);
              

              It does not work, and worst, it does not change when I use the standard Qt::ArrowCursor...

              I then tried changing the drop action. The only way to remove that "+" icon it to set the action to IgnoreAction, which well, does do anything on drop...

              Anymore tried to do something like that ?

              raven-worxR Offline
              raven-worxR Offline
              raven-worx
              Moderators
              wrote on last edited by
              #7

              @jpalbertini said:

              I try to reproduce the behavior of the OSX finder: by default it moves files/directories but press ALT while doing it and it will duplicate, showing a white "+" near the mouse cursor...

              The possible drop actions are defined when creating/starting the QDrag. So may it be that you only set a single drop action there?
              These drop actions can then be chosen by the user by pressing the modifier keys on the keyboard during the drag.
              Additionally the target widget also can force a specific drop target to be set once you drag over it.

              --- 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

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              • ValentinMicheletV ValentinMichelet

                @jpalbertini
                Could you show us your code please? Or better, provide a minimal code to reproduce this behavior.

                J Offline
                J Offline
                jpalbertini
                wrote on last edited by
                #8

                @ValentinMichelet
                the drag is done this way

                QDrag * drag = new QDrag(parentWidget());
                drag->start(Qt::CopyAction | Qt::MoveAction);
                

                Then the drop is here in the dragMoveEvent

                if (event->keyboardModifiers() == modifier)
                	event->setDropAction(Qt::MoveAction);
                else
                	event->setDropAction(Qt::IgnoreAction);
                

                Nothing else is tempering with the event...

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                • SGaistS Offline
                  SGaistS Offline
                  SGaist
                  Lifetime Qt Champion
                  wrote on last edited by
                  #9

                  Can you share the complete implementation ?

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

                  J 1 Reply Last reply
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                  • SGaistS SGaist

                    Can you share the complete implementation ?

                    J Offline
                    J Offline
                    jpalbertini
                    wrote on last edited by
                    #10

                    @SGaist
                    not all but here is most of it:

                    Here ifs the code where we start the D&D operation:

                    void QButtonSceneEditor::mouseMoveEvent(QMouseEvent* event)
                    {
                    	m_bIsMousePressProcessed = false;
                    	if(isChecked())
                    	{
                    		if(!visibleRegion().contains(event->localPos().toPoint()) &&
                    			event->buttons().testFlag(Qt::LeftButton))
                    		{
                    			dragDropManager()->addSceneButton(this);
                    
                    			QMimeData * mimeData = new QMimeData();
                    			mimeData->setData(DVC_SCENE_MIME_DATA, 0);
                    			QDrag * drag = new QDrag(parentWidget());
                    			drag->setMimeData(mimeData);
                    			drag->start(Qt::CopyAction | Qt::MoveAction);
                    		}
                    	}
                    }
                    

                    It's an custom button we want to move internally into its parent

                    void QSceneGroupEditor::dragMoveEvent(QDragMoveEvent * event)
                    {
                    	if (!event->mimeData()->hasFormat(DVC_SCENE_MIME_DATA))
                    	{
                    		event->ignore();
                    		return;
                    	}
                    
                    	QButtonScene* pScene = sceneAt(event->pos().x(), event->pos().y());
                    	if (pScene)
                    	{
                    		bool bInTop = event->pos().y() <= pScene->geometry().center().y();
                    		int iHover = m_lSceneButtons.indexOf(pScene);
                    		for (int iDragged(0); iDragged < dragDropManager()->sceneButtonCount(); iDragged++)
                    		{
                    			QButtonScene* pButton = dragDropManager()->sceneButtonAt(iDragged);
                    			if (pButton)
                    			{
                    				int iButton = m_lSceneButtons.indexOf(pButton);
                    				if (m_lSceneButtons.contains(pButton))
                    				{
                    					if (iHover == iButton || (bInTop && iHover == iButton + 1) || (!bInTop && iHover == iButton - 1))
                    					{
                    						m_pLblSeparator->hide();
                    						return;
                    					}
                    
                    					m_pLblSeparator->show();
                    					if (bInTop)
                    						m_pLblSeparator->move(pScene->pos().x() - 8, pScene->pos().y() - 8);
                    					else
                    						m_pLblSeparator->move(pScene->pos().x() - 8, pScene->pos().y() + pScene->geometry().height() - 3);
                    				}
                    				else
                    				{
                    					m_pLblSeparator->show();
                    					if (bInTop)
                    						m_pLblSeparator->move(pScene->pos().x() - 8, pScene->pos().y() - 8);
                    					else
                    						m_pLblSeparator->move(pScene->pos().x() - 8, pScene->pos().y() + pScene->geometry().height() - 3);
                    				}
                    			}
                    		}
                    	}
                    	else
                    		m_pLblSeparator->hide();
                    
                    	Qt::KeyboardModifiers modifier = Qt::AltModifier;
                    #if defined (Q_OS_MACX)
                    	if (event->keyboardModifiers() == modifier)
                    		event->setDropAction(Qt::MoveAction);
                    	else
                    		//event->setDropAction(Qt::IgnoreAction); // Works but, nothing happends...
                    		event->setDropAction(Qt::CopyAction);
                    #endif
                    	m_pButAdd->setVisible(event->keyboardModifiers() == modifier);
                    	event->accept();
                    }
                    

                    Unless there is something I did not understand about the D&D and/or the mouse icon management, i can't change the mouse icon unless using the Qt::IgnoreAction...

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                    • J Offline
                      J Offline
                      jpalbertini
                      wrote on last edited by
                      #11

                      Hum, nobody ?
                      Maybe I should report a bug...

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                      • SGaistS Offline
                        SGaistS Offline
                        SGaist
                        Lifetime Qt Champion
                        wrote on last edited by
                        #12

                        Are you calling acceptProposedAction where appropriate ?

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

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                        • D Offline
                          D Offline
                          ddze
                          wrote on last edited by
                          #13

                          I believe that is OS specific.

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                          • J Offline
                            J Offline
                            joorge87
                            wrote on last edited by
                            #14

                            Hi,

                            I have the same problem, did you find a way to solve it?

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