KdeBlurTest.py

import sys
from PyQt5 import QtCore, QtGui, QtWidgets, Qt
from Xlib import X, Xatom
from Xlib.display import Display
from Xlib.error import CatchError, BadAtom

def enable_blur(widget: QtWidgets.QWidget):
	ec = CatchError(BadAtom)
	display = Display()
	print('ec', ec)
	print('display', display)

	blurAtomId = display.intern_atom('_KDE_NET_WM_BLUR_BEHIND_REGION', only_if_exists=True)
	print('blurAtomId', blurAtomId)

	if blurAtomId == X.NONE:
		print('_KDE_NET_WM_BLUR_BEHIND_REGION is not currently supported')
		return

	windowHandle = widget.windowHandle()
	print('windowHandle', windowHandle)
	winId = windowHandle.winId() # sip.voidptr
	winId = winId.__int__() # https://stackoverflow.com/questions/47689778/how-do-you-go-from-a-sip-voidptr-qimage-constbits-to-a-ctypes-void-or-char-p
	print('winId', winId)

	window = display.create_resource_object('window', winId)
	print('window', window, window.get_wm_class())

	# Window.change_property(property, type, format, data, mode = X.PropModeReplace, onerror = None)
	window.change_property(
		blurAtomId,
		Xatom.CARDINAL, # https://github.com/python-xlib/python-xlib/blob/master/Xlib/Xatom.py
		32, # uint32
		[0] # Treated as [0, 0, widget.width(), widget.height()] even after resizing window
	)
	atomName = display.get_atom_name(blurAtomId)
	atomValue = window.get_property(blurAtomId, Xatom.CARDINAL, 0, 1)
	print(atomName, atomValue)


def center_widget(w: QtWidgets.QWidget):
	qt_rectangle = w.frameGeometry()
	center_point = QtWidgets.QDesktopWidget().availableGeometry().center()
	qt_rectangle.moveCenter(center_point)
	w.move(qt_rectangle.topLeft())


class MainWidget(QtWidgets.QWidget):
	def __init__(self):
		super().__init__()
		self.setGeometry(0, 0, 400, 400)
		self.setAttribute(QtCore.Qt.WA_TranslucentBackground)
		self.setWindowTitle("PyQt")

	def updateBlur(self):
		enable_blur(self)


def window():
	app = QtWidgets.QApplication(sys.argv)
	w = MainWidget()
	center_widget(w)

	bgRect = QtWidgets.QWidget(w)
	bgRect.setStyleSheet('background-color: rgba(127,0,0, 0.5)')
	bgRect.setGeometry(0, 0, w.width()/2, w.height())

	label = QtWidgets.QLabel(w)
	label.setText("Test Window")
	label.setStyleSheet('color: yellow')
	label.move(50, 20)

	w.show()
	w.updateBlur()
	sys.exit(app.exec_())


if __name__ == '__main__':
	window()