Signals and Slots
Signals and Slots in PyQt are used to communicate between various objects. After creating the GUI in Qt Designer and convert it to Python, users need to connect signals(like button clicks) to slots (functions that handles those clicks). For example , If you have a submit button and when it is clicked to validate user input or save data.
# In your generated Python file (layout.py)
from PyQt5.QtWidgets import QApplication, QMainWindow
from layout import Ui_MainWindow
class MyApp(QMainWindow, Ui_MainWindow):
def __init__(self):
super().__init__()
self.setupUi(self)
# Connect the button click to a function
self.submitButton.clicked.connect(self.submit_clicked)
def submit_clicked(self):
# Add logic to process the form data
username = self.usernameLineEdit.text()
password = self.passwordLineEdit.text()
# ... (add more code as needed)
Output:
Button clicked!
This is because the button_clicked method contains a print statement that outputs the specified text when the button is clicked. The if __name__ == ‘__main__’: block ensures that the application is executed when the script is run.
PyQt in Python : Designing GUI applications
Building GUI applications using the PYQT designer tool is comparatively less time-consuming than coding the widgets. It is one of the fastest and easiest ways to create GUIs.
The normal approach is to write the code even for the widgets and for the functionalities as well. But using Qt-designer, one can simply drag and drop the widgets, which is very useful while developing big-scale applications.
In this article, we will explore How to install PyQt and widgets, How to save the file, How to add Signals and Slots, How we can handle events, and so on.
Table of Content
- How to install PyQt?
- QT designer tool
- Widgets
- Save the file
- Signals and Slots
- Enhancing PyQt GUI Applications
- Conclusion
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