c++ - qt - Drag & Drop : Frame disappears -

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i'm create drag , drop between 2 qgroubbox. each contains dragdropframes, subclass qframe, have problem when want release dragdropframe groupbox, disappear instantly

dragdropframe:

void mousepressevent(qmouseevent *ev) {     if (ev->button() == qt::leftbutton)     {         offset = ev->pos();         if(!isreleasefromparentwidget)         {             releasefromparent(ev->pos());         }         ismousedown = true;     } };  void mousereleaseevent(qmouseevent *ev) {     if (ev->button() == qt::leftbutton)     {         ismousedown = false;     } }  void mousemoveevent(qmouseevent *ev) {     if (ismousedown)     {         this->move(maptoparent(ev->pos() - offset));     } }  void releasefromparent(qpoint point) {     oldparentwidget = parentwidget();     setparent(parentwidget()->parentwidget());     isreleasefromparentwidget = true;     this->move(maptoparent(offset)); }

when call releasefromparent in constructor dragdropframe , not somewhere else, works fine. if dragdrop-action not in process, every dragdropframe should have groupbox parent. knows i'm doing wrong? studyied multiple times, , think logic correct...

actually there isnt full drag , drop functionallity know, first want fix problem movement works fine.


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