**Course Title:** PySide6 Application Development **Section Title:** Advanced Widgets and Forms **Topic:** Introduction to basic widgets: QPushButton, QLabel, QLineEdit, etc. **Objective:** In this topic, we will delve into the world of PySide6 widgets, exploring some of the most commonly used basic widgets. By the end of this section, you will be able to create and customize various widgets to build robust and user-friendly graphical interfaces. **Basic Widgets Overview** In PySide6, widgets are the building blocks of any graphical user interface (GUI) application. They can be used to display information, gather user input, and create interactive elements. In this section, we will cover some of the most basic widgets, including: * QPushButton * QLabel * QLineEdit * QTextEdit * QSpinBox * QCheckBox * QRadioButton **QPushButton** ---------------- A QPushButton is a standard push-button widget. It can be used to trigger actions when clicked. **Example:** ```python import sys from PySide6.QtWidgets import QApplication, QPushButton, QWidget class Example(QWidget): def __init__(self): super().__init__() self.initUI() def initUI(self): button = QPushButton("Click Me", self) button.move(20, 20) button.clicked.connect(self.on_click) self.setGeometry(300, 300, 300, 200) self.setWindowTitle('QPushButton Example') self.show() def on_click(self): print("Button clicked!") def main(): app = QApplication(sys.argv) ex = Example() sys.exit(app.exec_()) if __name__ == '__main__': main() ``` **QLabel** ------------ A QLabel is a widget that displays text or an image. **Example:** ```python import sys from PySide6.QtWidgets import QApplication, QLabel, QWidget class Example(QWidget): def __init__(self): super().__init__() self.initUI() def initUI(self): label = QLabel("Hello, World!", self) label.move(20, 20) self.setGeometry(300, 300, 300, 200) self.setWindowTitle('QLabel Example') self.show() def main(): app = QApplication(sys.argv) ex = Example() sys.exit(app.exec_()) if __name__ == '__main__': main() ``` **QLineEdit** ------------- A QLineEdit is a widget that allows users to enter text. **Example:** ```python import sys from PySide6.QtWidgets import QApplication, QLineEdit, QWidget, QPushButton class Example(QWidget): def __init__(self): super().__init__() self.initUI() def initUI(self): lineEdit = QLineEdit(self) lineEdit.move(20, 20) button = QPushButton("Print Text", self) button.move(20, 50) button.clicked.connect(self.on_click) self.setGeometry(300, 300, 300, 200) self.setWindowTitle('QLineEdit Example') self.show() def on_click(self): text = self.findChild(QLineEdit) print(text.text()) def main(): app = QApplication(sys.argv) ex = Example() sys.exit(app.exec_()) if __name__ == '__main__': main() ``` **QTextEdit** ------------- A QTextEdit is a widget that allows users to edit multiple lines of text. **Example:** ```python import sys from PySide6.QtWidgets import QApplication, QTextEdit, QWidget class Example(QWidget): def __init__(self): super().__init__() self.initUI() def initUI(self): textEdit = QTextEdit(self) textEdit.move(20, 20) self.setGeometry(300, 300, 300, 200) self.setWindowTitle('QTextEdit Example') self.show() def main(): app = QApplication(sys.argv) ex = Example() sys.exit(app.exec_()) if __name__ == '__main__': main() ``` **QSpinBox** ------------- A QSpinBox is a widget that allows users to select an integer from a range of values. **Example:** ```python import sys from PySide6.QtWidgets import QApplication, QSpinBox, QWidget class Example(QWidget): def __init__(self): super().__init__() self.initUI() def initUI(self): spinBox = QSpinBox(self) spinBox.move(20, 20) self.setGeometry(300, 300, 300, 200) self.setWindowTitle('QSpinBox Example') self.show() def main(): app = QApplication(sys.argv) ex = Example() sys.exit(app.exec_()) if __name__ == '__main__': main() ``` **QCheckBox** -------------- A QCheckBox is a widget that allows users to select an option. **Example:** ```python import sys from PySide6.QtWidgets import QApplication, QCheckBox, QWidget class Example(QWidget): def __init__(self): super().__init__() self.initUI() def initUI(self): checkBox = QCheckBox("Check me", self) checkBox.move(20, 20) self.setGeometry(300, 300, 300, 200) self.setWindowTitle('QCheckBox Example') self.show() def main(): app = QApplication(sys.argv) ex = Example() sys.exit(app.exec_()) if __name__ == '__main__': main() ``` **QRadioButton** ----------------- A QRadioButton is a widget that allows users to select one option from a group of options. **Example:** ```python import sys from PySide6.QtWidgets import QApplication, QRadioButton, QWidget, QVBoxLayout class Example(QWidget): def __init__(self): super().__init__() self.initUI() def initUI(self): layout = QVBoxLayout() radio1 = QRadioButton("Option 1") radio2 = QRadioButton("Option 2") layout.addWidget(radio1) layout.addWidget(radio2) self.setLayout(layout) self.setGeometry(300, 300, 300, 200) self.setWindowTitle('QRadioButton Example') self.show() def main(): app = QApplication(sys.argv) ex = Example() sys.exit(app.exec_()) if __name__ == '__main__': main() ``` **Key Takeaways:** * Each type of widget has its own specific use case. * Understanding the different types of widgets and how to use them is crucial for building robust and user-friendly GUI applications. **External Resources:** * [PySide6 Documentation](https://doc.qt.io/qtforpython/tutorials/index.html) **What's Next?** * In the next topic, we will cover advanced widgets, including QComboBox, QListWidget, QTableWidget, and QTreeView. **Do you have any questions about this topic? Feel free to ask in the comments below.**