how to get the name of a button created by QDialogButtonBox? - c++

Question

I'm trying get all the button child widgets of a window. The buttons were created through QDialogButtonBox. How do I get the which one is the cancel/ok/save button?
I have:
QWidget *pWin = QApplication::activeWindow();
QList<QPushButton *> allPButtons = pWin->findChildren<QPushButton *>();
QListIterator<QPushButton*> i(allPButtons);
while( i.hasNext() )
{
//identify which button is cancel/ok/save button here
/*Note: This is where I'm having trouble, getting the text of the
button here returns NULL. Any other way of Identifying which is
which?
Is it a special case when buttons are created through QDialogButtonBox?
*/
}

Answer 1

You should use the QDialogButtonBox::button() method, to get the button of the corresponding role.
For instance :
QPushButton* pOkButton = pButtonBox->button(QDialogButtonBox::Ok);
QPushButton* pCancelButton = pButtonBox->button(QDialogButtonBox::Cancel);
// and so on...
Generally speaking, I would say it's a bad idea to find a button from it's text, as this text might change when you app is internationalized.

Answer 2

One way is by text parameter from constructor such as QPushButton(const QString & text, QWidget * parent = 0):
QPushButton* buttonSave = new QPushButton("Save");
// etc..
while( i.hasNext() )
{
//identify which button is cancel/ok/save button here
if(i.next()->text() == "Save") {
// do something to save push button
}
}

Answer 3

Another alternative solution:
Use QDialogButtonBox's buttons function to return a list of all the buttons that have been added to the button box, then iterate over the list and identify each button using QDialogButtonBox's standardButton.
auto buttons = ui->buttonBox->buttons();
for (auto button : buttons) {
switch (ui->buttonBox->standardButton(button)) {
case QDialogButtonBox::Ok:
// do something
break;
case QDialogButtonBox::Cancel:
// do something
break;
case QDialogButtonBox::Save:
// do something
break;
default:
break;
}
}
For non-standard buttons
Map each button to an enum:
.h file:
private:
enum class NonStandardButton { Undo, Redo };
// map of non-standard buttons to enum class NonStandardButton
QHash<QAbstractButton*, NonStandardButton> buttonsMap;
.cpp file:
// in constructor
auto undoQPushButton =
ui->buttonBox->addButton("Undo", QDialogButtonBox::ActionRole);
auto redoQPushButton =
ui->buttonBox->addButton("Redo", QDialogButtonBox::ActionRole);
buttonsMap.insert(undoQPushButton, NonStandardButton::Undo);
buttonsMap.insert(redoQPushButton, NonStandardButton::Redo);
Then use QDialogButtonBox::NoButton to identify non-standard buttons:
switch (ui->buttonBox->standardButton(button)) {
case QDialogButtonBox::NoButton:
switch (buttonsMap.value(button)) {
case NonStandardButton::Undo:
// do something
break;
case NonStandardButton::Redo:
// do something
break;
default:
break;
}
default:
break;
}