QPushButton

QPushButton is derived from QAbstractButton, an abstract base class for all button types.

Since QAbstractButton inherits from QWidget, all QWidget properties aply. The table lists QAbstractButton-specific attributes. Qt's API design allows getting and setting these properties via methods like text() and setText().

#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    
    QIcon targetIcon(":/target.png");
    ui->btnTarget->setIcon(targetIcon);
    ui->btnTarget->setIconSize(QSize(80, 80));

    ui->btnMoveUp->setIcon(QIcon(":/up.png"));
    ui->btnMoveUp->setIconSize(QSize(50, 50));
    ui->btnMoveDown->setIcon(QIcon(":/down.png"));
    ui->btnMoveDown->setIconSize(QSize(50, 50));
    ui->btnMoveLeft->setIcon(QIcon(":/left.png"));
    ui->btnMoveLeft->setIconSize(QSize(50, 50));
    ui->btnMoveRight->setIcon(QIcon(":/right.png"));
    ui->btnMoveRight->setIconSize(QSize(50, 50));

    ui->btnMoveUp->setShortcut(QKeySequence(Qt::CTRL + Qt::Key_W));
    ui->btnMoveDown->setShortcut(QKeySequence(Qt::Key_S));
    ui->btnMoveLeft->setShortcut(QKeySequence(Qt::Key_A));
    ui->btnMoveRight->setShortcut(QKeySequence(Qt::Key_D));

    ui->btnMoveUp->setAutoRepeat(true);
    ui->btnMoveDown->setAutoRepeat(true);
    ui->btnMoveLeft->setAutoRepeat(true);
    ui->btnMoveRight->setAutoRepeat(true);
}

MainWindow::~MainWindow() {
    delete ui;
}

void MainWindow::on_btnMoveUp_clicked() {
    QRect pos = ui->btnTarget->geometry();
    ui->btnTarget->setGeometry(pos.x(), pos.y() - 5, pos.width(), pos.height());
}

void MainWindow::on_btnMoveDown_clicked() {
    QRect pos = ui->btnTarget->geometry();
    ui->btnTarget->setGeometry(pos.x(), pos.y() + 5, pos.width(), pos.height());
}

void MainWindow::on_btnMoveLeft_clicked() {
    QRect pos = ui->btnTarget->geometry();
    ui->btnTarget->setGeometry(pos.x() - 5, pos.y(), pos.width(), pos.height());
}

void MainWindow::on_btnMoveRight_clicked() {
    QRect pos = ui->btnTarget->geometry();
    ui->btnTarget->setGeometry(pos.x() + 5, pos.y(), pos.width(), pos.height());
}

QRadioButton

QRadioButton provides exclusive selection within a group of options.

#include "selectiondialog.h"
#include "ui_selectiondialog.h"

SelectionDialog::SelectionDialog(QWidget *parent)
    : QDialog(parent)
    , ui(new Ui::SelectionDialog)
{
    ui->setupUi(this);
    ui->optMale->setChecked(true);
    ui->lblResult->setText("Selected gender: Male");
    
    ui->optOther->setEnabled(false);
}

SelectionDialog::~SelectionDialog() {
    delete ui;
}

void SelectionDialog::on_optMale_clicked() {
    ui->lblResult->setText("Selected gender: Male");
}

void SelectionDialog::on_optFemale_clicked() {
    ui->lblResult->setText("Selected gender: Female");
}

QButtonGroup manages exclusive groups of radio buttons.

OrderDialog::OrderDialog(QWidget *parent)
    : QDialog(parent)
    , ui(new Ui::OrderDialog)
{
    ui->setupUi(this);
    
    QButtonGroup* beverageGroup = new QButtonGroup(this);
    QButtonGroup* mealGroup = new QButtonGroup(this);
    QButtonGroup* dessertGroup = new QButtonGroup(this);

    beverageGroup->addButton(ui->radCoffee);
    beverageGroup->addButton(ui->radTea);
    beverageGroup->addButton(ui->radJuice);

    mealGroup->addButton(ui->radBurger);
    mealGroup->addButton(ui->radPizza);
    mealGroup->addButton(ui->radSalad);

    dessertGroup->addButton(ui->radCake);
    dessertGroup->addButton(ui->radIceCream);
}

QCheckBox

QCheckBox allows multiple selections. Key properties checkable and checked are enherited from QAbstractButton. The tristate property enables a third indeterminate state.

#include "planner.h"
#include "ui_planner.h"

Planner::Planner(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Planner)
{
    ui->setupUi(this);
}

Planner::~Planner() {
    delete ui;
}

void Planner::on_btnShowPlan_clicked() {
    QString schedule = "Today's schedule: ";
    if (ui->chkExercise->isChecked()) {
        schedule += ui->chkExercise->text() + " ";
    }
    if (ui->chkRead->isChecked()) {
        schedule += ui->chkRead->text() + " ";
    }
    if (ui->chkWork->isChecked()) {
        schedule += ui->chkWork->text() + " ";
    }
    ui->lblSchedule->setText(schedule);
}