Qt theme in pure qss

[Plan C]

Qt Theme is a pure qss project that can easily improve the style of existing projects.

Supports C++, PyQt5, PyQt6, PySide2, PySide6, and is published on GitHub Pages as WebAssembly.

Here is a demo of its use on Python, first install it:

pip install QtTheme

Alternatively, without installing QtTheme, you can export a single-style qrc resource package through the online website. Use RCC to add it to your project。

Let AI write an UI for me as an style example:

# Generated by ChatGPT
import sys
from PyQt5.QtCore import Qt
from PyQt5.QtWidgets import QApplication, QDialog, QVBoxLayout, QHBoxLayout, QPushButton, QLabel, QLineEdit, QComboBox, QCheckBox, QRadioButton

class MyWindow(QDialog):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("PyQt5 Widgets Example")
        self.setGeometry(100, 100, 400, 300)

        # Create layouts
        main_layout = QVBoxLayout()  # Vertical layout for the whole window
        form_layout = QVBoxLayout()  # Layout for the form

        # Add a QLabel and QLineEdit (text input)
        self.label = QLabel("Enter your name:", self)
        self.text_input = QLineEdit(self)

        form_layout.addWidget(self.label)
        form_layout.addWidget(self.text_input)

        # Add a QComboBox (dropdown)
        self.combo_label = QLabel("Select your favorite color:", self)
        self.combo_box = QComboBox(self)
        self.combo_box.addItems(["Red", "Green", "Blue", "Yellow"])

        form_layout.addWidget(self.combo_label)
        form_layout.addWidget(self.combo_box)

        # Add a QCheckBox
        self.check_box = QCheckBox("I agree to the terms and conditions", self)

        form_layout.addWidget(self.check_box)

        # Add a QRadioButton (grouped)
        self.radio_label = QLabel("Choose your preferred language:", self)
        self.radio_button_english = QRadioButton("English", self)
        self.radio_button_french = QRadioButton("French", self)
        self.radio_button_spanish = QRadioButton("Spanish", self)

        # Add the radio buttons to a horizontal layout
        radio_layout = QHBoxLayout()
        radio_layout.addWidget(self.radio_button_english)
        radio_layout.addWidget(self.radio_button_french)
        radio_layout.addWidget(self.radio_button_spanish)

        form_layout.addWidget(self.radio_label)
        form_layout.addLayout(radio_layout)

        # Add a QPushButton
        self.submit_button = QPushButton("Submit", self)
        self.submit_button.clicked.connect(self.on_button_click)

        # Add an exit button
        self.exit_button = QPushButton("Exit", self)

        button_layout = QHBoxLayout()
        button_layout.addWidget(self.submit_button)
        button_layout.addWidget(self.exit_button)

        # Add the form layout to the main layout
        main_layout.addLayout(form_layout)
        main_layout.addLayout(button_layout)

        # Set the window layout
        self.setLayout(main_layout)

    def on_button_click(self):
        name = self.text_input.text()
        favorite_color = self.combo_box.currentText()
        is_agree = self.check_box.isChecked()
        preferred_language = "None"

        if self.radio_button_english.isChecked():
            preferred_language = "English"
        elif self.radio_button_french.isChecked():
            preferred_language = "French"
        elif self.radio_button_spanish.isChecked():
            preferred_language = "Spanish"

        print(f"Name: {name}")
        print(f"Favorite Color: {favorite_color}")
        print(f"Agreed to Terms: {is_agree}")
        print(f"Preferred Language: {preferred_language}")

if __name__ == "__main__":
    app = QApplication(sys.argv)
    window = MyWindow()
    window.show()
    sys.exit(app.exec_())

try to run it:

Import QtTheme, then read and set the style for the root widget through the Qt resource system:

import QtTheme.PyQt5
from PyQt5.QtCore import QFile

class MyWindow(QDialog):
    def __init__(self):
        # ...
        qss = QFile(":/QtTheme/theme/Flat/Dark/Blue/Pink.qss")
        qss.open(QFile.OpenModeFlag.ReadOnly)
        self.setStyleSheet(qss.readAll().data().decode())

Finally, set the color for the widgets through QWidget.setProperty as needed:

class MyWindow(QDialog):
    def __init__(self):
        # ...
        qss = QFile(":/QtTheme/theme/Flat/Dark/Blue/Pink.qss")
        qss.open(QFile.OpenModeFlag.ReadOnly)
        self.setStyleSheet(qss.readAll().data().decode())

        self.submit_button.setProperty("Color", "Primary")
        self.exit_button.setProperty("Color", "Danger")