c++ - QInputDialog in mouse event -

in example code:

class mywidget : public qwidget { q_object protected:     void mousepressevent(qmouseevent *event)     {         qdebug() << event;         event->accept();         qinputdialog::gettext(null, "", "");     } }; 

when click right mouse button on widget input dialog appear on screen. after click button on dialog closed , mousepressevent call again , again , show dialog. if click left mouse button or ctrl+left mouse button on widget work fine. bug apper on mac os (under windows work fine).

please me avoid bug.

those static/synchronous dialog functions seemed bit dubious me -- implemented recursively re-invoking qt event loop routine within gettext() call, , it's easy "interesting" re-entrancy issues when use them. (for example, if event in program delete mywidget object before user had dismissed qinputdialog, after qinputdialog::gettext() returned, program executing within mousepressevent() method of deleted mywidget object, situation begging cause undefined behavior)

in case, recommended fix avoid static/synchronous gettext() call , use signals instead, this:

#include <qwidget> #include <qinputdialog> #include <qmouseevent>  class mywidget : public qwidget { q_object public:     mywidget() : dialog(null) {}     ~mywidget() {delete dialog;}  protected:     void mousepressevent(qmouseevent *event)     {         event->accept();          if (dialog)         {            dialog->raise();            dialog->setfocus();         }         else         {            dialog = new qinputdialog;            connect(dialog, signal(finished(int)), this, slot(dialogdismissed()));            dialog->show();         }     }  private slots:     void dialogdismissed()     {        if (dialog)        {           int result = dialog->result();           qstring t = dialog->textvalue();            printf("dialog finished, result %i, user entered text [%s]\n", result, t.toutf8().constdata());           dialog->deletelater();  // can't call delete because (dialog) calling function (via signal)!           dialog = null;        }     }  private:     qinputdialog * dialog; };