PyQt5 - Setting line edit to the ComboBox

PyQt5 - Setting line edit to the ComboBox

In PyQt5, you can set a QLineEdit to a QComboBox to allow users to enter custom text along with selecting options from the dropdown list. This can be useful in scenarios where you want to provide both predefined options and the flexibility to enter custom data.

Here's a step-by-step guide on how to do this:

Step 1: Import PyQt5 Modules

First, you need to import the necessary modules from PyQt5:

from PyQt5.QtWidgets import QApplication, QWidget, QVBoxLayout, QComboBox, QLineEdit

Step 2: Create a Main Window Class

Create a class for your main window and set up the UI components:

class MainWindow(QWidget): def __init__(self): super().__init__() self.initUI() def initUI(self): # Create a QVBoxLayout instance layout = QVBoxLayout() # Create a QComboBox instance self.comboBox = QComboBox() # Add items to comboBox self.comboBox.addItems(["Option 1", "Option 2", "Option 3"]) # Set QLineEdit to the comboBox self.comboBox.setEditable(True) # Optionally, you can set a custom QLineEdit # self.comboBox.setLineEdit(QLineEdit()) # Add comboBox to the layout layout.addWidget(self.comboBox) # Set the layout to the main window self.setLayout(layout)

Step 3: Initialize and Run the Application

Finally, create an instance of QApplication and your main window, then run the application:

if __name__ == "__main__": import sys app = QApplication(sys.argv) mainWindow = MainWindow() mainWindow.show() sys.exit(app.exec_())

When you run this code, you'll see a window with a combo box. The combo box will allow you to select from the predefined options ("Option 1", "Option 2", "Option 3") or enter a custom value.

Additional Customization

  • Customize QLineEdit: You can further customize the QLineEdit by creating an instance of it and setting it to the combo box with setLineEdit(). This allows for more control over the text field, like setting validators or placeholders.
  • Handling User Input: You may want to handle the text entered by the user. Connect a slot to the QComboBox's editTextChanged signal to react to changes in the text.

This approach gives you a flexible and user-friendly UI component that combines the features of a dropdown list with the flexibility of a text entry field.

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