Python PyQt program - Customize appearance

Python PyQt Widgets: Exercise-6 with Solution

Write a Python program that customizes the appearance of a label text color, input field background color and a push button to close the dialog using PyQt.

From doc.qt.io:

QDialog Class: The QDialog class is the base class of dialog windows.

QVBoxLayout Class: The QVBoxLayout class lines up widgets vertically.

QLabel Class: The QLabel widget provides a text or image display.

QLineEdit Class: A line edit allows the user to enter and edit a single line of plain text with a useful collection of editing functions, including undo and redo, cut and paste, and drag and drop.

QPushButton: The push button, or command button, is perhaps the most commonly used widget in any graphical user interface. Push (click) a button to command the computer to perform some action, or to answer a question. Typical buttons are OK, Apply, Cancel, Close, Yes, No and Help.

QPalette Class: The QPalette class contains color groups for each widget state.

QColor Class: The QColor class provides colors based on RGB, HSV or CMYK values.

Sample Solution:

Python Code:

from PyQt5.QtWidgets import QDialog, QVBoxLayout, QLabel, QLineEdit, QPushButton
from PyQt5.QtGui import QPalette, QColor
class CustomDialog(QDialog):
    def __init__(self):
        super().__init__()

        # Set the window properties (title and initial size)
        self.setWindowTitle("Custom Dialog")
        self.setGeometry(100, 100, 300, 150)  # (x, y, width, height)

        # Create a layout for the dialog
        layout = QVBoxLayout()

        # Create a QLabel with custom text color
        label = QLabel("Input your name:")
        palette = QPalette()
        palette.setColor(QPalette.Foreground, QColor("red"))
        label.setPalette(palette)

        # Create a QLineEdit with custom background color
        line_edit = QLineEdit()
        line_edit.setStyleSheet("background-color: orange;")

        # Create a QPushButton to close the dialog
        close_button = QPushButton("Close")
        close_button.clicked.connect(self.close)

        # Add widgets to the layout
        layout.addWidget(label)
        layout.addWidget(line_edit)
        layout.addWidget(close_button)

        # Set the layout for the dialog
        self.setLayout(layout)

def main():
    dialog = CustomDialog()
    dialog.exec_()

if __name__ == "__main__":
    main()

Explanation:

In the exercise above -

• Import the necessary modules.
• Create a custom "QDialog" named "CustomDialog".
• Set the dialog's title and initial size.
• Create a QVBoxLayout to arrange widgets vertically.
• Create a QLabel with the text "Input your name:" and customize its text color to red using QPalette.
• Create a QLineEdit and customize its background color to light yellow using setStyleSheet.
• Create a QPushButton labeled "Close" and connect its click event to close the dialog.
• Add QLabel, QLineEdit, and QPushButton to the QVBoxLayout.
• Set the QVBoxLayout as the dialog layout.
• In the main() function, we create the PyQt application, create an instance of the "CustomDialog" class, show the window, and run the application's event loop.

Output:

Flowchart:

Python Code Editor:

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