**Custom Widgets and Components: Developing a Qt-based Emoji Picker Widget** In this example, we'll create a custom emoji picker widget using PyQt6. The emoji picker will display a list of emojis, allow users to filter emojis by category, and copy the selected emoji to the clipboard. **Installation and Setup** Before we begin, ensure you have the following installed: * PyQt6 (`pip install pyqt6`) * A Python environment (preferably Python 3.8 or later) **Emoji Picker Widget Code** Create a new file called `emoji_picker.py` and add the following code: ```python import sys from PyQt6.QtWidgets import QApplication, QWidget, QVBoxLayout, QComboBox, QScrollArea, QLabel, QGridLayout from PyQt6.QtGui import QIcon, QPalette, QColor from PyQt6.QtCore import Qt import clipboard import json class EmojiPicker(QWidget): def __init__(self): super().__init__() # Load emoji categories and data with open('emojis.json') as f: self.emojis = json.load(f) # Create layout layout = QVBoxLayout() self.setLayout(layout) # Create filter combo box self.filter_combo = QComboBox() self.filter_combo.addItems(['All'] + self.emojis.keys()) self.filter_combo.currentTextChanged.connect(self.filter_emojis) layout.addWidget(self.filter_combo) # Create scroll area for emojis self.scroll_area = QScrollArea() self.scroll_area.setWidgetResizable(True) self.scroll_area.setHorizontalScrollBarPolicy(Qt.ScrollBarPolicy.ScrollBarAlwaysOff) layout.addWidget(self.scroll_area) # Create emoji grid self.emoji_grid = QGridLayout() self.emoji_grid.setContentsMargins(0, 0, 0, 0) self.emoji_grid.setSpacing(5) # Initialize emoji grid with all emojis self.add_emojis_to_grid(self.emojis) # Set up scroll area with emoji grid self.scroll_area.setWidget(QWidget()) self.scroll_area.widget().setLayout(self.emoji_grid) def add_emojis_to_grid(self, emojis): row = 0 column = 0 # Clear grid while self.emoji_grid.count(): child = self.emoji_grid.takeAt(0) if child.widget(): child.widget().deleteLater() # Populate grid with emojis for category, emoji_list in emojis.items(): for emoji in emoji_list: label = QLabel(emoji) label.setAlignment(Qt.AlignmentFlag.AlignCenter) self.emoji_grid.addWidget(label, row, column) # Add copy to clipboard functionality def copy_emoji(emoji=emoji): clipboard.copy(emoji) label.mousePressEvent = lambda event, emoji=emoji: copy_emoji(emoji) column += 1 if column == 5: # 5 columns per row row += 1 column = 0 def filter_emojis(self, filter_text): if filter_text == 'All': self.add_emojis_to_grid(self.emojis) else: self.add_emojis_to_grid({filter_text: self.emojis[filter_text]}) if __name__ == '__main__': app = QApplication(sys.argv) # Load style sheet with open('style.qss', 'r') as f: app.setStyleSheet(f.read()) emoji_picker = EmojiPicker() emoji_picker.resize(300, 400) emoji_picker.setWindowTitle('Emoji Picker') emoji_picker.show() sys.exit(app.exec()) ``` **Emoji Data (emojis.json)** ```json { "Smileys & Emotion": ["😊", "😄", "😆", "😎", "😍"], "Animals": ["🐶", "🐱", "🐔", "🐷", "🐴"], "Food": ["🍔", "🍕", "🥤", "🍣", "🥨"], "Flags": ["🇺🇸", "🇬🇧", "🇨🇦", "🇦🇺", "🇯🇵"] } ``` **Custom Style Sheet (style.qss)** ```css QWidget { background-color: #f5f5f5; color: #333; } QLabel { padding: 10px; font-size: 24px; } QComboBox { border: 1px solid #ccc; padding: 5px; font-size: 16px; } QScrollArea { border: none; } QGridLayout { spacing: 5px; } ``` **Running the Emoji Picker Widget** 1. Save the above code in a file called `emoji_picker.py`. 2. Create a new file called `emojis.json` in the same directory with the provided emoji data. 3. Create a new file called `style.qss` in the same directory with the provided custom style sheet. 4. Run the `emoji_picker.py` file using Python (e.g., `python emoji_picker.py`). This will launch the emoji picker widget, allowing you to browse and filter emojis by category, and copy the selected emoji to the clipboard. **Conclusion** In this example, we've created a custom emoji picker widget using PyQt6, showcasing a unique and engaging UI component that enhances the user experience. By leveraging the power of Qt and Python, we can develop complex and interactive applications that cater to various needs and use cases.