Restrict hidding of qsplitterhandle in qsplitter



  • Hello all,

    PROBLEM STATMENT :
    I wanted to give clickable feature to QSplitterHandle of QSplitter. as I wanted to perform show or hide some of the widgets in QSplitter.
    Something like the button between pdf and bookmark in pdf readers, which is drag-able ( to incress/decrees widget size ratio) and clickable too( to show/hide bookmarks) in the below screenshot.0_1554476234460_0c82bc8a-4b35-43b3-8c30-e53652b229d6-image.png.

    I have extended the QSplitterHandle to add a signal which is emited when handle is clicked (mouseReleaseEvent()). and also extended qsplitter to use above QSplitterHandle in the createHandle() of qsplitter.
    Below is the sample code of the same:

    class MySplitterHandle : public QSplitterHandle
    {
    public:
        explicit MySplitterHandle(Qt::Orientation o, QSplitter *parent);
        void mouseReleaseEvent(QMouseEvent *) override;
    signal:
    void clicked();
    };
    
    class MySplitter : public QSplitter
    {
    public:
        explicit MySplitter(QWidget* parent = nullptr);
    protected:
         QSplitterHandle *createHandle()
      {
         return new MySplitterHandle(this->orientation(),this);
      }
    };
    

    I added 2 widgets to MySplitter and made MySplitterHandle widget as 15.and I have connected the emit signal of the QSplitterHandle to a slot which hide/show (toggle) the first widget.
    Now my GUI is something like first widget, then 15 pxl QSplitterHandle and then second widget.

    ISSUE:
    when I try to hide the first widget, QSplitterHandle also get hidden along with first widget. And I am not able to get it back.
    How can I restrict QSplitterHandle to hide when hiding the first widget.

    I have tried my best to give all details so that you all can understand the issue well and guide me. Any initiative is appreciated.


  • Lifetime Qt Champion

    Hi,

    Do you mean like if you would have use QSplitter::setCollapsible on that widget ?



  • Yes I tried using setCollapsible false also but this also did not helped.
    In that case also when I try to hide the first widget, qsplitterhandle next to it also gets hidden. That's strange to me.



  • This may be out of context of this issue but I found something stranger.
    I was playing around with qsplitter and setOpaqueResize as false with a intention that resized event should not get called for added widgets in qsplitter. When I click on the handle ( without moving the handle), mouse click event is emitted and splitterMoved() signal is also emitted (even though handle is not moved).

    But on the contrary, when I set setOpaqueResize as true , on click of the handle without moving it, only mouse click event is triggered.

    This is very surprising to me. I am using qt5.12.


  • Lifetime Qt Champion

    It's indeed a bit surprising but there might be some filtering done on the mouse with regard to that.

    As for my question, I think I miswrote it. From your description, it seems that you are re-implementing collapsible widgets but I may have misunderstood you. Is that the case ?



  • @SGaist
    I am not trying to re-implement collapsible widgets.My intention is to use the custum qsplitterhandle hence I have overridden the 'QSplitterHandle *createHandle()' of qsplitter baseclass.



  • I used setSizes() to hide my first widget in my onSplitterHandleClicked slot. And in that slot I am also saving the splitter sizes to restore back widgets sizes when the handle is clicked again. This works fine now.



  • Something like this :

    QList<int> savedSize;
    MySplitterHandle *splitterHandle=qobject_cast<MySplitterHandle*>(splitter.handle(1));
        connect(splitterHandle,SIGNAL(Clicked()),this,SLOT(handleClickedSot()));
    
    void handleClickedSot() //slot
    {
        QTimer::singleShot(50,this, &Widget2::showHideWidget);
    }
    
    void Widget2::showHideWidget()
    {
        m_ShowHideFlag=!m_ShowHideFlag;
        if(m_ShowHideFlag)
        {
            savedSize=splitter.sizes();
            QList<int> newSize(savedSize);
            newSize[0]=0; //hide first widget
            splitter.setSizes(newSize);
        }
        else
        {
            splitter.setSizes(savedSize);
        }
    }
    

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