Qt: How to implement QDialogButtonBox with QSignalMapper for non-standard button ?? - qt

Question

I have a QDialogButtonBox with All Standard Button and Non Standard Buttons (QPushbutton added to create Non-Standard Buttons).
I can implement SignalMapper saperately for Non-Standard Buttons.But in this case i have to add 2 slots (Slot for QDialogButtonBox Standard Buttons & Slot for Non-Standard Buttons).
I need to implement QSignalMapper with common slot for Standard Buttons as well as Non-Standard buttons.
Can anyone guide me for it ?

Answer 1

You shouldn't need to use QSignalMapper with QDialogButtonBox.
QSignalMapper is used to connect multiple signals to a single slot, and QDialogButtonBox already has a single signal that is emitted for all the buttons: clicked(QAbstractButton*).
You could simply assign a value to the button with a map (QMap, std::map) or through a dynamic property:
enum { MyRole1 = 1, MyRole2 }; // starting at 1 because an unset property would return 0
...
userButton−>setProperty("ActionRole", MyRole1); // a cast to int might be needed here
buttonBox->addButton(userButton, QDialogButtonBox::ActionRole);
connect(this, SIGNAL(clicked(QAbstractButton*)), SLOT(dialogButtonClicked(QAbstractButton *button)));
And in the slot, you would get the value back from the parameter passed by the signal:
void MyClass::dialogButtonClicked(QAbstractButton *button) {
StandardButton standardButton = buttonBox−>standardButton(button);
switch(standardButton) {
// Standard buttons:
case QDialogButtonBox::Ok:
...
break;
case QDialogButtonBox::Abort:
...
break;
// Non-standard buttons:
case QDialogButtonBox::NoButton:
int actionRole = button->property("ActionRole").toInt();
switch(actionRole) {
case MyRole1:
...
break;
case MyRole2:
...
break;
default:
// shouldn't happen
break;
}
}
}

Answer 2

QSignalMapper can map a QObject and a integer. So you can map your non-standardButton with its role and create a slot that takes in parameter a role:
For example:
void Widget::initMap() {
QPushButton* buttonReset = new QPushButton( "Reset" );
signalMapper = new QSignalMapper(this);
connect(buttonReset, SIGNAL(clicked()), signalMapper, SLOT(map()));
signalMapper->setMapping(button, QDialogButtonBox::ResetRole);
connect(signalMapper, SIGNAL(mapped(int)), this, SLOT(slot(int)));
}
void Widget::slot( int role) {
if ( role == QDialogButtonBox::ResetRole ) {
reset();
} else if ( QDialogButtonBox::Apply ) {
apply();
}
}