PyQt5 - Setting font to all the items in ComboBox

PyQt5 - Setting font to all the items in ComboBox

In PyQt5, to set the font for all the items in a QComboBox, you need to customize the QComboBox's item delegate. This involves subclassing QStyledItemDelegate and overriding its paint method to apply the desired font. Then, you set this custom delegate to your QComboBox. Here's how you can do it:

Step-by-Step Implementation

  1. Import Necessary Modules:

    import sys from PyQt5.QtWidgets import QApplication, QWidget, QVBoxLayout, QComboBox, QStyledItemDelegate from PyQt5.QtGui import QFont

  2. Create a Custom Delegate Class: Subclass QStyledItemDelegate and override the paint method.

    class CustomDelegate(QStyledItemDelegate): def __init__(self, parent=None): super().__init__(parent) def paint(self, painter, option, index): # Set custom font option.font = QFont("Arial", 12) # Example: Arial font, size 12 super().paint(painter, option, index)

  3. Set the Custom Delegate to QComboBox: Create a QComboBox and set the custom delegate to it.

    comboBox = QComboBox() comboBox.setItemDelegate(CustomDelegate())

  4. Add Items to the ComboBox:

    comboBox.addItems(["Item 1", "Item 2", "Item 3"])

Complete Example

Here's a complete example that demonstrates the whole process:

import sys from PyQt5.QtWidgets import QApplication, QWidget, QVBoxLayout, QComboBox, QStyledItemDelegate from PyQt5.QtGui import QFont class CustomDelegate(QStyledItemDelegate): def __init__(self, parent=None): super().__init__(parent) def paint(self, painter, option, index): option.font = QFont("Arial", 12) # Set font here super().paint(painter, option, index) class Example(QWidget): def __init__(self): super().__init__() # Create layout layout = QVBoxLayout() # Create ComboBox and set custom delegate comboBox = QComboBox() comboBox.setItemDelegate(CustomDelegate()) # Add items to the ComboBox comboBox.addItems(["Item 1", "Item 2", "Item 3"]) # Add ComboBox to the layout layout.addWidget(comboBox) # Set layout to the window self.setLayout(layout) # Window settings self.setGeometry(300, 300, 200, 150) self.setWindowTitle('QComboBox Custom Font Example') self.show() if __name__ == '__main__': app = QApplication(sys.argv) ex = Example() sys.exit(app.exec_())

How It Works

  • The CustomDelegate class changes the font of each item in the QComboBox.
  • By setting this delegate to the QComboBox, all items in the combo box will use the specified font.
  • You can customize the font by changing the parameters in QFont.

This method allows you to have consistent font styling for all items in your QComboBox, enhancing the visual consistency of your PyQt5 application.

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