qt - How to force QActionGroup to allow uncheck? -

i have number of actions put in qactiongroup, because want them exclusive (if 1 checked, others should unchecked). however, want able uncheck of them. @ moment if check action1, , click button again, not uncheck, way uncheck click on different action. in short, qactiongroup ensures 1 of actions checked - want ensure 1 or 0 actions checked. there workaround this?

i'm using pyside i'm comfortable qt in c++ well, solution in c++ fine - i'm sure convert it.

code (not helpful, i'm posting in case relevant)

def definegroups(self):      navigation = qactiongroup(self)     navigation.addaction(self.action1)     navigation.addaction(self.action2)     navigation.addaction(self.action3)     navigation.addaction(self.action4)     navigation.addaction(self.action5)     navigation.addaction(self.action6)     navigation.addaction(self.action7) 

all actions checkable (set in qt designer).

related: there bug report similar this, designers have decided not change anything: https://bugreports.qt-project.org/browse/qtbug-3512

i using qt in c++ instead of python, hope these information help.

unfortunately there seems no direct solution problem @ present. "exclusive" property of qactiongroup limits feature of selection, ensures @ least , 1 action selected @ 1 time (but @ begining of program, have manually set 1 of actions "checked")

here part of source code, can see how works on qaction if "exclusive" property installed qactiongroup

{     if ( !isexclusive() )       return;     qaction* s = (qaction*) sender();     if ( b ) {       if ( s != d->selected ) {           d->selected = s;           ( qptrlistiterator<qaction> it( d->actions); it.current(); ++it ) {             if ( it.current()->istoggleaction() && it.current() != s )                 it.current()->seton( false );           }           emit activated();           emit selected( s );       } else if ( !s->istoggleaction() ) {           emit activated();       }     } else {       if ( s == d->selected ) {           // @ least 1 has selected           s->seton( true );       }     } } 

(ref: http://qt-x11-free.sourcearchive.com/documentation/3.3./classqactiongroup_182fe3a5a859e6397a4ba05be346d894.html older version of qt, concept same)

(see also: http://qt-x11-free.sourcearchive.com/documentation/3.3.6/classqactiongroup_032480c0c57abda9c1b4485ee9edbcc7.html#032480c0c57abda9c1b4485ee9edbcc7)

to solve problem, @ least have 2 options:

1. still use qactiongroup , add qaction "none selected" (or similar) in list. might proper option since considers "no selection" selection , can exploit feature of qactiongroup .

2. not use qactiongroup. in case, have manually implement exclusiveness. once qaction selected, emit signal sends pointer qaction* slot compares present selection previous 1 buffer (default = 0), if difference occurs, deselect (use setcheck(false)) previous 1 , assign present selection buffer.

it's rough idea, still feasible if need feature

[edit]: though not sure exact functionality want, wrote c++ code here fyr. notice demo of "ostensible" feature of exclusively checkable qactions , ability of unchecking checked one.the according responses of checked/unchecked state still need further implementation.

theclass.h:

class theclass  {     q_object       ......  public slots:     void action0checked();     void action1checked();     void action2checked();     void comparechecked(qaction *newchecked);  signals:     void selectedid(qaction *newchecked);  private:             qaction *buffer;     qlist<qaction*> actionlist; } 

theclass.cpp:

theclass::theclass() {     qmenubar *menubar = new qmenubar(this);      buffer = 0;      qmenu *menu = menubar->addmenu("actionlist");     actionlist.append(menu->addaction("action0"));     actionlist.append(menu->addaction("action1"));     actionlist.append(menu->addaction("action2"));      (int i=0; i<3; i++) {         actionlist[i]->setcheckable(true);     }      connect(actionlist[0], signal(triggered()), this, slot(action0checked()));     connect(actionlist[1], signal(triggered()), this, slot(action1checked()));     connect(actionlist[2], signal(triggered()), this, slot(action2checked()));     connect(this, signal(selectedid(qaction*)), this, slot(comparechecked(qaction*))); }  void theclass::action0checked() {     if (actionlist[0]->ischecked()) {         // sth.          emit selectedid(actionlist[0]);     } }  void theclass::action1checked() {     if (actionlist[1]->ischecked()) {         // sth.          emit selectedid(actionlist[1]);     } }  void theclass::action2checked() {     if (actionlist[2]->ischecked()) {         // sth.          emit selectedid(actionlist[2]);     } }  void theclass::comparechecked(qaction *newchecked) {     if (newchecked != buffer) {         if (buffer != 0)             buffer->setchecked(false);          buffer = newchecked;     } }