**Course Title:** PyQt6 Application Development **Section Title:** Building Responsive and Adaptive UIs **Topic:** Building a multi-view app with dynamic layouts and split views.(Lab topic) **Introduction** In this lab, we will explore how to build a multi-view application using PyQt6. We will learn how to create a UI that adapts to different window sizes and orientations using dynamic layouts and split views. This will enable us to design applications that can run on a variety of devices, from desktop computers to mobile devices. **Prerequisites** Before starting this lab, you should have a good understanding of the following topics: * Basic structure of a PyQt6 application * Using layouts (QVBoxLayout, QHBoxLayout, QGridLayout) * Handling events and signals in PyQt6 * Creating reusable custom widgets * Designing dynamic UIs that adapt to window resizing **Lab Objective** In this lab, we will build a multi-view application that includes the following features: * A dynamic layout that adapts to different window sizes * A split view that allows the user to toggle between two different views * A reusable custom widget that can be used in multiple views **Step 1: Create a new PyQt6 project** Create a new PyQt6 project using your IDE or a text editor. Name the project "MultiViewApp". **Step 2: Design the UI** Create a new file called `mainwindow.py` and add the following code: ```python import sys from PyQt6.QtWidgets import QApplication, QMainWindow, QSplitter, QVBoxLayout, QWidget class MainWindow(QMainWindow): def __init__(self): super().__init__() self.setGeometry(100, 100, 800, 600) self.splitter = QSplitter() self.splitter.setOrientation(QSplitter.Orientation.Horizontal) self.view1 = QWidget() self.view2 = QWidget() self.splitter.addWidget(self.view1) self.splitter.addWidget(self.view2) self.setCentralWidget(self.splitter) if __name__ == "__main__": app = QApplication(sys.argv) window = MainWindow() window.show() sys.exit(app.exec()) ``` This code creates a new `QMainWindow` with a `QSplitter` widget that is set to horizontal orientation. We also create two `QWidget` instances that will be used as views. **Step 3: Implement the views** Create a new file called `view1.py` and add the following code: ```python from PyQt6.QtWidgets import QVBoxLayout, QLabel class View1(QWidget): def __init__(self): super().__init__() layout = QVBoxLayout() label = QLabel("View 1") layout.addWidget(label) self.setLayout(layout) ``` Create a new file called `view2.py` and add the following code: ```python from PyQt6.QtWidgets import QVBoxLayout, QLabel class View2(QWidget): def __init__(self): super().__init__() layout = QVBoxLayout() label = QLabel("View 2") layout.addWidget(label) self.setLayout(layout) ``` These views are simple and only contain a label. In a real-world application, you would replace these views with more complex widgets or custom widgets. **Step 4: Add the views to the splitter** In the `mainwindow.py` file, add the following code to the `__init__` method: ```python from view1 import View1 from view2 import View2 ... self.view1 = View1() self.view2 = View2() self.splitter.addWidget(self.view1) self.splitter.addWidget(self.view2) ``` This code creates instances of the `View1` and `View2` classes and adds them to the splitter. **Step 5: Run the application** Run the application by executing the `mainwindow.py` file. You should see a window with a splitter that contains two views. You can resize the window and the views will adapt to the new size. **Key Concepts** * Dynamic layouts: Using layouts that adapt to different window sizes and orientations. * Split views: Using a `QSplitter` widget to toggle between two different views. * Reusable custom widgets: Creating custom widgets that can be used in multiple views. **Practical Takeaways** * Use dynamic layouts to create UIs that adapt to different window sizes and orientations. * Use a `QSplitter` widget to toggle between two different views. * Create reusable custom widgets to simplify your code and improve maintainability. **What's Next** In the next topic, we will explore the Model-View-Controller (MVC) pattern in PyQt6. This pattern is a widely used design pattern that separates the application logic into three interconnected components: the model, the view, and the controller. **References** * PyQt6 documentation: [https://www.riverbankcomputing.com/static/Docs/PyQt6/](https://www.riverbankcomputing.com/static/Docs/PyQt6/) * Qt documentation: [https://doc.qt.io/qt-6/](https://doc.qt.io/qt-6/) * Model-View-Controller (MVC) pattern: [https://en.wikipedia.org/wiki/Model%E2%80%93view%E2%80%93controller](https://en.wikipedia.org/wiki/Model%E2%80%93view%E2%80%93controller) **Leave a comment or ask for help** If you have any questions or need help with this lab, please leave a comment below.