QButtonBox set default button

qt, user-interface

Solution

Make sure you set auto default `false` as well, use `setAutoDefault(false)` as well as `setDefault(false)`.

Example code below.

#include <QtWidgets>

int main(int argc, char** argv)
{
  QApplication app(argc, argv);

  QDialogButtonBox* bb = new QDialogButtonBox(
    QDialogButtonBox::Ok | QDialogButtonBox::Cancel);

  QPushButton* okBtn = bb->button(QDialogButtonBox::Ok);
  okBtn->setAutoDefault(true);
  okBtn->setDefault(true);

  QPushButton* caBtn = bb->button(QDialogButtonBox::Cancel);
  caBtn->setAutoDefault(false);
  caBtn->setDefault(false);

  QDialog dlg;
  QVBoxLayout* dlgLayout = new QVBoxLayout();
  dlgLayout->addWidget(bb);
  dlg.setLayout(dlgLayout);
  dlg.show();
  return app.exec();
}

When I tested this on Windows, the OK button was the default button by default, but I could swap that to the cancel button by changing the calls to `setAutoDefault` and `setDefault`.

Problem

Under Qt 5.3, the default button of a QButtonBox is `Cancel` and I want to set it to `Ok` but I can't find a way to achieve it. I've tried this : ``` QPushButton * b = ui->buttonBox->button(QDialogButtonBox::Ok); b->setDefault(true); ``` but with no success, it throws : ``` /Users/thomas/Dev/Joker/app/Joker/RulerSpaceDialog.cpp:18:3: error: member access into incomplete type 'QPushButton' b->setDefault(true); ^ /Applications/Qt/5.3/clang_64/lib/QtWidgets.framework/Versions/5/Headers/qdialog.h:50:7: note: forward declaration of 'QPushButton' class QPushButton; ^ 1 error generated. ``` I also try by browsing the list but with no luck.... EDIT : I added the include to get that code : ``` QPushButton * b = ui->buttonBox->button(QDialogButtonBox::Ok); if(b) { b->setDefault(true); qDebug() << b->text(); } ``` Which outputs `Ok` waits 2secs then highlight the `Cancel` button...

Original source