q-materialise 0.1.8

An enhanced Material Design stylesheet library for Qt (PyQt5, PyQt6, PySide2 and PySide6)

QMaterialise

QMaterialise is a modern Material Design stylesheet library for Qt applications written in Python. It is a ground‑up redesign of the qt‑material library by UN‑GCPDS, and we’re grateful for their original work. It draws inspiration from the Material Design specification and provides a clean and flexible implementation with:

• Cross‑binding support – works with PyQt5, PyQt6, PySide2 and PySide6. At runtime the library automatically selects whichever binding is installed.
• Comprehensive colour palettes – more Material Design colours are built in, including all of the primary swatches and their tints/shades.
• Easy customisation – generate new styles from a few colours or load predefined styles shipped with the package. Styles are expressed as JSON dictionaries, making them easy to edit and share.
• Dynamic theming – apply a new style to a running application without restarting it and switch between dark and light variants on the fly.
• Runtime extras – override button colours, fonts, density scale and more by passing an extra dictionary to the inject_style function.
• Export to QSS – write the generated stylesheet to a .qss file so it can be used directly in Qt Designer or C++ projects.

Material Design is a design system created by Google. QMaterialise provides a coherent set of colours and styles that conform to the specification while still giving you freedom to customise the look and feel of your application.

Installation

QMaterialise can be installed from PyPI. Depending on which Qt binding you intend to use you should also install the corresponding optional dependency:

# Install the core library
pip install "q-materialise"

Quick start

The simplest way to style your application is to call inject_style() after you create your QApplication instance. This function accepts either the name of one of the built‑in styles or a custom Style object:

import sys
from q_materialise import inject_style, list_styles

try:
    # Try to import your preferred Qt binding
    from PySide6 import QtWidgets
except ImportError:
    from q_materialise.binding import QtWidgets  # internal helper

app = QtWidgets.QApplication(sys.argv)
window = QtWidgets.QMainWindow()

# Print the available built‑in styles
print(list_styles())

inject_style(app, style="indigo_twilight")
window.setWindowTitle("QMaterialise Example")
window.resize(480, 320)
window.show()
sys.exit(app.exec())

To customise individual aspects of the style, pass an extra dictionary. For example, to change the colours of different classes of QPushButton:

extra = {
    "danger": "#dc3545",
    "warning": "#ffc107",
    "success": "#198754",
    "info": "#0d6efd",
    "font_family": "Roboto",
    "font_size": "14px",
    "density_scale": 0,
}

inject_style(app, style="sapphire_day", extra=extra)

Button classes are attached by setting the class property on the widget:

push_button.setProperty("class", "danger")

Generating custom styles

To create a completely new style programmatically, use the generate_style() function. Pass your primary and secondary base colours and indicate whether the style should be dark or light. The function returns a Style instance with sensible tints and shades computed for you:

from q_materialise import generate_style, inject_style

my_style = generate_style(
    name="my_custom_dark",
    primary="#9c27b0",  # purple
    secondary="#ffeb3b",  # yellow
    is_dark=True,
)

inject_style(app, style=my_style)

Styles are plain data classes and can be serialised to and from JSON. For example:

import json

json_string = my_style.to_json(indent=4)
with open("my_style.json", "w", encoding="utf-8") as f:
    f.write(json_string)

# Later
from q_materialise import Style

with open("my_style.json", encoding="utf-8") as f:
    other_style = Style.from_json(f.read())

Listing styles

Built‑in styles are stored as JSON files in the package. You can list them at runtime with list_styles() and load one with get_style(name):

from q_materialise import list_styles, get_style

print(list_styles())
indigo_style = get_style("indigo_twilight")

Exporting a stylesheet

If you want to use the generated stylesheet outside of Python you can export it to a .qss file. The export_style() function takes the name of the style, the destination file and optional extras:

from q_materialise import export_style

export_style(style="indigo_twilight", qss_path="indigo_twilight.qss")

Documentation

Full documentation is published online and can be accessed at:

https://lewis-morris.github.io/qmaterialise

Contributing

Contributions are welcome! If you find a bug or have an idea for a feature, please open an issue or submit a pull request. Feel free to add new styles by placing a JSON file in the src/q_materialise/styles directory.

Note: q-materialise is as a redesign of the qt‑material project— thanks to the UN‑GCPDS team.