**Course Title:** PySide6 Application Development **Section Title:** Building Responsive and Dynamic UIs **Topic:** Advanced widgets: QComboBox, QListWidget, QTableWidget, QTreeView **Overview** In this topic, we'll delve into the world of advanced widgets in PySide6. You'll learn how to create dynamic and interactive user interfaces using QComboBox, QListWidget, QTableWidget, and QTreeView. These widgets are essential for building responsive and feature-rich applications. By the end of this topic, you'll have a solid understanding of how to harness the power of these widgets to create engaging and user-friendly interfaces. **QComboBox** QComboBox is a drop-down list widget that allows users to select from a list of items. It's commonly used for selecting options, such as font sizes, colors, or categories. **Example:** ```python import sys from PySide6.QtWidgets import QApplication, QComboBox, QLabel class MainWindow(QApplication): def __init__(self): super().__init__() self.initUI() def initUI(self): combo = QComboBox() combo.addItem("Option 1") combo.addItem("Option 2") combo.addItem("Option 3") label = QLabel("Select an option:") label.setBuddy(combo) layout = QVBoxLayout() layout.addWidget(label) layout.addWidget(combo) self.mainWindow = QWidget() self.mainWindow.setLayout(layout) self.mainWindow.show() if __name__ == "__main__": app = MainWindow() sys.exit(app.exec()) ``` **Key Concepts:** * QComboBox can be used to create a drop-down list of items. * Use `addItem()` to add items to the combo box. * Use `setBuddy()` to associate a label with the combo box. **QListWidget** QListWidget is a widget that displays a list of items. It's commonly used for displaying a list of files, emails, or other types of data. **Example:** ```python import sys from PySide6.QtWidgets import QApplication, QListWidget, QWidget, QVBoxLayout class MainWindow(QApplication): def __init__(self): super().__init__() self.initUI() def initUI(self): listWidget = QListWidget() listWidget.addItem("Item 1") listWidget.addItem("Item 2") listWidget.addItem("Item 3") layout = QVBoxLayout() layout.addWidget(listWidget) self.mainWindow = QWidget() self.mainWindow.setLayout(layout) self.mainWindow.show() if __name__ == "__main__": app = MainWindow() sys.exit(app.exec()) ``` **Key Concepts:** * QListWidget can be used to display a list of items. * Use `addItem()` to add items to the list widget. **QTableWidget** QTableWidget is a widget that displays a table of data. It's commonly used for displaying data in a grid format, such as a spreadsheet. **Example:** ```python import sys from PySide6.QtWidgets import QApplication, QTableWidget, QTableWidgetItem, QVBoxLayout, QWidget class MainWindow(QApplication): def __init__(self): super().__init__() self.initUI() def initUI(self): tableWidget = QTableWidget(3, 3) tableWidget.setHorizontalHeaderLabels(["Column 1", "Column 2", "Column 3"]) tableWidget.setVerticalHeaderLabels(["Row 1", "Row 2", "Row 3"]) item = QTableWidgetItem("Cell 1") tableWidget.setItem(0, 0, item) layout = QVBoxLayout() layout.addWidget(tableWidget) self.mainWindow = QWidget() self.mainWindow.setLayout(layout) self.mainWindow.show() if __name__ == "__main__": app = MainWindow() sys.exit(app.exec()) ``` **Key Concepts:** * QTableWidget can be used to display a table of data. * Use `setHorizontalHeaderLabels()` and `setVerticalHeaderLabels()` to set the header labels. * Use `setItem()` to set the contents of a cell. **QTreeView** QTreeView is a widget that displays a hierarchical tree of data. It's commonly used for displaying file systems, database schemas, or other types of hierarchical data. **Example:** ```python import sys from PySide6.QtWidgets import QApplication, QTreeView, QFileSystemModel, QVBoxLayout, QWidget class MainWindow(QApplication): def __init__(self): super().__init__() self.initUI() def initUI(self): model = QFileSystemModel() model.setRootPath(".") treeView = QTreeView() treeView.setModel(model) layout = QVBoxLayout() layout.addWidget(treeView) self.mainWindow = QWidget() self.mainWindow.setLayout(layout) self.mainWindow.show() if __name__ == "__main__": app = MainWindow() sys.exit(app.exec()) ``` **Key Concepts:** * QTreeView can be used to display a hierarchical tree of data. * Use `QFileSystemModel` to display a file system. * Use `setModel()` to set the model for the tree view. **Conclusion** In this topic, you learned how to use advanced widgets in PySide6 to create dynamic and interactive user interfaces. You now know how to use QComboBox, QListWidget, QTableWidget, and QTreeView to display and manage complex data. **Practical Takeaways** * Use QComboBox to create drop-down lists. * Use QListWidget to display lists of data. * Use QTableWidget to display tables of data. * Use QTreeView to display hierarchical trees of data. **Recommended Reading** * [Qt Documentation: QComboBox](https://doc.qt.io/qtforpython/PySide6/QtWidgets/QComboBox.html) * [Qt Documentation: QListWidget](https://doc.qt.io/qtforpython/PySide6/QtWidgets/QListWidget.html) * [Qt Documentation: QTableWidget](https://doc.qt.io/qtforpython/PySide6/QtWidgets/QTableWidget.html) * [Qt Documentation: QTreeView](https://doc.qt.io/qtforpython/PySide6/QtWidgets/QTreeView.html) **What's Next** In the next topic, we'll cover designing dynamic UIs that adapt to window resizing. You'll learn how to use layouts and geometry management to create flexible and responsive interfaces. **Leave a Comment or Ask for Help** If you have any questions or need help with any of the topics covered in this course, please leave a comment below. We'll do our best to respond promptly and provide guidance and support.