QT Making a Dropdown Menu Widget Programmatically - c++

Question

I am using QT 5.5 with Mac OSX. I want to make several dropdown menu widgets programmatically that will have various options that can change the values of certain variables.
So for example, I would have dropdown menu 1 represent variable "command" have:
- Q
- W
- E
- R
And by selecting whichever one, then it would make command = Q, or command = W. So that way, I can send command to another program knowing that I sent Q, or W.
My current mainwindow looks something like this:
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
//******* Set up
ui->setupUi(this);
ui->centralWidget->setLayout(new QVBoxLayout);
// 01: Creation of Console
console = new Console;
console->setEnabled(false);
/************** Adding Widgets *********************/
//creation and attribution of slider
slider = new QSlider();
slider->resize(255, 20);
slider->setOrientation(Qt::Horizontal);
slider->setRange(0, 255); //0-255 is range we can read
//creation and attribution of the lcd
lcd = new QLCDNumber();
lcd->setSegmentStyle(QLCDNumber::Flat);
lcd->resize(255, 50);
//03: Adding widgets to layout
//add console as a widget to the main widget
//layout with slider and lcd underneath console
ui->centralWidget->layout()->addWidget(console);
ui->centralWidget->layout()->addWidget(slider);
ui->centralWidget->layout()->addWidget(lcd);
////////I WANT TO ADD VARIOUS DROPDOWN MENUS HERE NEXT TO EACH OTHER////////
/************** Connection Events ***********************/
....
}

Answer 1

Assuming you want a ComboBox, Here is how you can do it:
QStringList commands = { "Q", "W", "E", "R" };
QComboBox* combo = new QComboBox(this);
combo->addItems(commands);
connect( combo, &QComboBox::currentTextChanged, this, &MainWindow::commandChanged);
Now you will get the command text when user changes the combo box item. and you can write your code based on that.
MainWindow::commandChanged(const QString& command_text)
{
//Do the logic based on command_text
}
Another option if you want to choose combobox item texts differently is that you set itemData for combobox items. and get them in your slot by currentData property of the ComboBox.