QT Button Example

[KenJustKen]

I have a "simple" question and I am tired or programming like I am in C. I am doing a dialog with several radio button groups and I would like to get the values when the user presses okay. I have been looking at the example

QT Group Box Example (http://doc.qt.io/qt-5/qtwidgets-widgets-groupbox-example.html)

(Code below)


This example does a really nice job on showing how to build a button box correctly. However, it does not show how to access the current values when the user presses ok. I could go in and add numerous hacks and events to get me this data but I am tired of programming like this is C code and not C++. But again, I would like to know the correct method to do this and "pretend" I know how to program correctly.

Can any one give me an idea on how to access the radio button values in created in "createFirstExclusiveGroup" ??

Ken




#include <QtWidgets>

#include "window.h"

Window::Window(QWidget *parent)
: QWidget(parent)
{
QGridLayout *grid = new QGridLayout;
grid->addWidget(createFirstExclusiveGroup(), 0, 0);
grid->addWidget(createSecondExclusiveGroup(), 1, 0);
grid->addWidget(createNonExclusiveGroup(), 0, 1);
grid->addWidget(createPushButtonGroup(), 1, 1);
setLayout(grid);

setWindowTitle(tr("Group Boxes"));
resize(480, 320);
}

QGroupBox *Window::createFirstExclusiveGroup()
{
QGroupBox *groupBox = new QGroupBox(tr("Exclusive Radio Buttons"));

QRadioButton *radio1 = new QRadioButton(tr("&Radio button 1"));
QRadioButton *radio2 = new QRadioButton(tr("R&adio button 2"));
QRadioButton *radio3 = new QRadioButton(tr("Ra&dio button 3"));

radio1->setChecked(true);

QVBoxLayout *vbox = new QVBoxLayout;
vbox->addWidget(radio1);
vbox->addWidget(radio2);
vbox->addWidget(radio3);
vbox->addStretch(1);
groupBox->setLayout(vbox);

return groupBox;
}

QGroupBox *Window::createSecondExclusiveGroup()
{
QGroupBox *groupBox = new QGroupBox(tr("E&xclusive Radio Buttons"));
groupBox->setCheckable(true);
groupBox->setChecked(false);

QRadioButton *radio1 = new QRadioButton(tr("Rad&io button 1"));
QRadioButton *radio2 = new QRadioButton(tr("Radi&o button 2"));
QRadioButton *radio3 = new QRadioButton(tr("Radio &button 3"));
radio1->setChecked(true);
QCheckBox *checkBox = new QCheckBox(tr("Ind&ependent checkbox"));
checkBox->setChecked(true);

QVBoxLayout *vbox = new QVBoxLayout;
vbox->addWidget(radio1);
vbox->addWidget(radio2);
vbox->addWidget(radio3);
vbox->addWidget(checkBox);
vbox->addStretch(1);
groupBox->setLayout(vbox);

return groupBox;
}

QGroupBox *Window::createNonExclusiveGroup()
{
QGroupBox *groupBox = new QGroupBox(tr("Non-Exclusive Checkboxes"));
groupBox->setFlat(true);

QCheckBox *checkBox1 = new QCheckBox(tr("&Checkbox 1"));
QCheckBox *checkBox2 = new QCheckBox(tr("C&heckbox 2"));
checkBox2->setChecked(true);
QCheckBox *tristateBox = new QCheckBox(tr("Tri-&state button"));
tristateBox->setTristate(true);
tristateBox->setCheckState(Qt::PartiallyChecked);

QVBoxLayout *vbox = new QVBoxLayout;
vbox->addWidget(checkBox1);
vbox->addWidget(checkBox2);
vbox->addWidget(tristateBox);
vbox->addStretch(1);
groupBox->setLayout(vbox);

return groupBox;
}

QGroupBox *Window::createPushButtonGroup()
{
QGroupBox *groupBox = new QGroupBox(tr("&Push Buttons"));
groupBox->setCheckable(true);
groupBox->setChecked(true);

QPushButton *pushButton = new QPushButton(tr("&Normal Button"));
QPushButton *toggleButton = new QPushButton(tr("&Toggle Button"));
toggleButton->setCheckable(true);
toggleButton->setChecked(true);
QPushButton *flatButton = new QPushButton(tr("&Flat Button"));
flatButton->setFlat(true);

QPushButton *popupButton = new QPushButton(tr("Pop&up Button"));
QMenu *menu = new QMenu(this);
menu->addAction(tr("&First Item"));
menu->addAction(tr("&Second Item"));
menu->addAction(tr("&Third Item"));
menu->addAction(tr("F&ourth Item"));
popupButton->setMenu(menu);

QAction *newAction = menu->addAction(tr("Submenu"));
QMenu *subMenu = new QMenu(tr("Popup Submenu"));
subMenu->addAction(tr("Item 1"));
subMenu->addAction(tr("Item 2"));
subMenu->addAction(tr("Item 3"));
newAction->setMenu(subMenu);

QVBoxLayout *vbox = new QVBoxLayout;
vbox->addWidget(pushButton);
vbox->addWidget(toggleButton);
vbox->addWidget(flatButton);
vbox->addWidget(popupButton);
vbox->addStretch(1);
groupBox->setLayout(vbox);

return groupBox;
}

[anda_skoa]

Ideally you would just keep the pointers to the radio buttons in members of your widget, then you could simply iterate over the respective container.

Something like:



class Window : public QWidget
{
// ....


private:
QVector<QRadioButton*> m_buttonsOfFirstGroup;
};




QGroupBox *Window::createFirstExclusiveGroup()
{
QGroupBox *groupBox = new QGroupBox(tr("Exclusive Radio Buttons"));

QRadioButton *radio1 = new QRadioButton(tr("&Radio button 1"));
QRadioButton *radio2 = new QRadioButton(tr("R&adio button 2"));
QRadioButton *radio3 = new QRadioButton(tr("Ra&dio button 3"));

m_buttonsOfFirstGroup.reserve(3);
m_buttonsOfFirstGroup << radio1 << radio2 << radio3;

// ....
}


Cheers,
_

[KenJustKen]

Okay, thanks. There is no "magic" way to access them from the gui directly. By adding these pointers, it makes life easier.

Thanks.

[anda_skoa]

Well, you could use QObject::findChildren() on each group box but you would then either need to store the groupbox pointers or find them first.

Storing the pointers to the elements you intend to interact with, in your case the radio buttons, is much cleaner.

Cheers,
_